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Fuqiang Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution
    'MDPI AG', 2021
    Co-Authors: Fuqiang Zheng, Feng Chen, Shuai Wang, Yufeng Guo, Lingzhi Yang, Jinlai Zhang, Guanzhou Qiu
    Abstract:

    The effects of F− concentration, leaching temperature, and time on the Ti leaching from Ti-bearing Electric Furnace slag (TEFS) by [NH4+]-[F−] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F− concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS was controlled by surface chemical reaction. The semi-empirical kinetics equation was consistent with the real experimental results, with a correlation coefficient (R2) of 0.996. The Ti leaching rate reached 92.83% after leaching at 90 °C for 20 min with F− concentration of 14 mol/L and [NH4+]/[F−] ratio of 0.4. The leaching rates of Si, Fe, V, Mn, and Cr were 94.03%, 7.24%, 5.36%, 4.54%, and 1.73%, respectively. The Ca, Mg, and Al elements were converted to (NH4)3AlF6 and CaMg2Al2F12 in the residue, which can transform into stable oxides and fluorides after pyro-hydrolyzing and calcinating

  • a novel process for preparation of titanium dioxide from ti bearing Electric Furnace slag nh4hf2 hf leaching and hydrolyzing process
    Journal of Hazardous Materials, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Shuai Wang, Yufeng Guo, Guanzhou Qiu, Yulei Sui, Lingzhi Yang
    Abstract:

    Abstract A novel process to prepare titanium dioxide from Ti-bearing Electric Furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4+]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing Electric Furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF62− and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF62− during hydrolysis process were also studied. In the hydrolysis process, the TiF62− is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800 °C and 1000 °C, respectively.

  • removal of magnesium and calcium from Electric Furnace titanium slag by h3po4 oxidation roasting leaching process
    Transactions of Nonferrous Metals Society of China, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Shuai Wang
    Abstract:

    Abstract H3PO4 oxidation roasting followed by HCl acid leaching was proposed to remove magnesium and calcium from Electric Furnace titanium slag containing 3.12% MgO and 0.86% CaO. XRF, XRD and SEM techniques were used to characterize the composition, mineral phase component and microstructure of the titanium slag. The H3PO4 oxidation thermodynamic, mineral phase transformation, microstructure, element distribution in titanium slag during H3PO4 oxidation process and leaching process were investigated. The thermodynamic analysis indicated that H3PO4 could promote the decomposition of MgTi2O5 and CaSiO3. The results indicated that H3PO4 could effectively promote the transformation of titanium-bearing mineral to rutile and enrich the impurities in MxTi3–xO5 into phosphate which could be removed by acid leaching process. Under the studied conditions, the leaching rates of magnesium and calcium reached 94.68% and 87.19%, respectively. The acid leached slag containing 0.19% MgO and 0.13% CaO (mass fraction) was obtained.

  • transformation of ti bearing mineral in panzhihua Electric Furnace titanium slag during oxidation roasting process
    Journal of Thermal Analysis and Calorimetry, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Wenting Duan, Shuai Wang
    Abstract:

    The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.

  • effects of basicity and mgo in slag on the behaviors of smelting vanadium titanomagnetite in the direct reduction Electric Furnace process
    Metals, 2016
    Co-Authors: Shuai Wang, Feng Chen, Fuqiang Zheng
    Abstract:

    The effects of basicity and MgO content on reduction behavior and separation of iron and slag during smelting vanadium titanomagnetite by Electric Furnace were investigated. The reduction behaviors affect the separation of iron and slag in the direct reduction-Electric Furnace process. The recovery rates of Fe, V, and Ti grades in iron were analyzed to determine the effects of basicity and MgO content on the reduction of iron oxides, vanadium oxides, and titanium oxides. The chemical compositions of vanadium-bearing iron and main phases of titanium slag were detected by XRF and XRD, respectively. The results show that the higher level of basicity is beneficial to the reduction ofiron oxides and vanadium oxides, and titanium content dropped in molten iron with the increasing basicity. As the content of MgO increased, the recovery rate of Fe increased slightly but the recovery rate of V increased considerably. The grades of Ti in molten iron were at a low level without significant change when MgO content was below 11%, but increased as MgO content increased to 12.75%. The optimum conditions for smelting vanadium titanomagnetite were about 11.38% content of MgO and quaternary basicity was about 1.10. The product, vanadium-bearing iron, can be applied in the converter steelmaking process, and titanium slag containing 50.34% TiO2 can be used by the acid leaching method.

Tao Jiang - One of the best experts on this subject based on the ideXlab platform.

  • a novel process for preparation of titanium dioxide from ti bearing Electric Furnace slag nh4hf2 hf leaching and hydrolyzing process
    Journal of Hazardous Materials, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Shuai Wang, Yufeng Guo, Guanzhou Qiu, Yulei Sui, Lingzhi Yang
    Abstract:

    Abstract A novel process to prepare titanium dioxide from Ti-bearing Electric Furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4+]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing Electric Furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF62− and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF62− during hydrolysis process were also studied. In the hydrolysis process, the TiF62− is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800 °C and 1000 °C, respectively.

  • removal of magnesium and calcium from Electric Furnace titanium slag by h3po4 oxidation roasting leaching process
    Transactions of Nonferrous Metals Society of China, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Shuai Wang
    Abstract:

    Abstract H3PO4 oxidation roasting followed by HCl acid leaching was proposed to remove magnesium and calcium from Electric Furnace titanium slag containing 3.12% MgO and 0.86% CaO. XRF, XRD and SEM techniques were used to characterize the composition, mineral phase component and microstructure of the titanium slag. The H3PO4 oxidation thermodynamic, mineral phase transformation, microstructure, element distribution in titanium slag during H3PO4 oxidation process and leaching process were investigated. The thermodynamic analysis indicated that H3PO4 could promote the decomposition of MgTi2O5 and CaSiO3. The results indicated that H3PO4 could effectively promote the transformation of titanium-bearing mineral to rutile and enrich the impurities in MxTi3–xO5 into phosphate which could be removed by acid leaching process. Under the studied conditions, the leaching rates of magnesium and calcium reached 94.68% and 87.19%, respectively. The acid leached slag containing 0.19% MgO and 0.13% CaO (mass fraction) was obtained.

  • transformation of ti bearing mineral in panzhihua Electric Furnace titanium slag during oxidation roasting process
    Journal of Thermal Analysis and Calorimetry, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Wenting Duan, Shuai Wang
    Abstract:

    The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.

  • ferronickel preparation from nickeliferous laterite by rotary kiln Electric Furnace process
    Characterization of Minerals Metals and Materials, 2016
    Co-Authors: Hao Jia, Yuanbo Zhang, Jun Luo, Zhiwei Peng, Tao Jiang
    Abstract:

    Nickel is an important strategic metal, which is mainly used for stainless steel production. In the recent years, ferronickel has been used as a substitute for electrolytic nickel for alleviating the cost of stainless steel production. Rotary kiln-Electric Furnace (RKEF) smelting is currently the world-wide mainstreaming process for ferronickel production from nickeliferous laterite ore, in spite of the high power consumption. In this study, aiming to provide some meaningful guidance for ferronickel production of RKEF smelting, reductive roasting followed by smelting process was carried out. The conditions including reducing parameters (roasting temperature and time) and smelting parameters (coke dosage, CaO dosage, melting temperature and time) were ascertained. The metal recovery ratios, as well as Ni, Fe, S and P content of ferronickel were considered. The results showed that a ferronickel containing 10. 32 wt. % Ni was obtained from a laterite with 1. 85 wt. % Ni, the nickel recovery ratio was about 99%.

  • kinetics of hydrochloric acid leaching of titanium from titanium bearing Electric Furnace slag
    JOM, 2016
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Andrew Yakovlevich Travyanov, Guanzhou Qiu
    Abstract:

    The hydrochloric acid leaching of titanium from titanium-bearing Electric Furnace slag was investigated under different experimental conditions. The results indicate that particle size, hydrochloric acid concentration and reaction temperature were of significance to the leaching kinetics. Specifically, reaction temperature was the most important factor followed by hydrochloric acid concentration and particle size. The shrinking core model was used to describe the leaching process which was controlled by surface chemical reaction. The kinetic equation was obtained and the activation energy was found to be 43.16 kJ/mol. Iron and calcium species were almost completely dissolved in the acid when the extraction degree of titanium reached 99.84%. MgO (19.34 wt.%) and Al2O3 (32.45 wt.%) in the spinel were still in the leaching residue and SiO2 (43.53 wt.%) in the form of quartz remained in the leaching residue.

Shuai Wang - One of the best experts on this subject based on the ideXlab platform.

  • Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution
    'MDPI AG', 2021
    Co-Authors: Fuqiang Zheng, Feng Chen, Shuai Wang, Yufeng Guo, Lingzhi Yang, Jinlai Zhang, Guanzhou Qiu
    Abstract:

    The effects of F− concentration, leaching temperature, and time on the Ti leaching from Ti-bearing Electric Furnace slag (TEFS) by [NH4+]-[F−] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F− concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS was controlled by surface chemical reaction. The semi-empirical kinetics equation was consistent with the real experimental results, with a correlation coefficient (R2) of 0.996. The Ti leaching rate reached 92.83% after leaching at 90 °C for 20 min with F− concentration of 14 mol/L and [NH4+]/[F−] ratio of 0.4. The leaching rates of Si, Fe, V, Mn, and Cr were 94.03%, 7.24%, 5.36%, 4.54%, and 1.73%, respectively. The Ca, Mg, and Al elements were converted to (NH4)3AlF6 and CaMg2Al2F12 in the residue, which can transform into stable oxides and fluorides after pyro-hydrolyzing and calcinating

  • a novel process for preparation of titanium dioxide from ti bearing Electric Furnace slag nh4hf2 hf leaching and hydrolyzing process
    Journal of Hazardous Materials, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Shuai Wang, Yufeng Guo, Guanzhou Qiu, Yulei Sui, Lingzhi Yang
    Abstract:

    Abstract A novel process to prepare titanium dioxide from Ti-bearing Electric Furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4+]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing Electric Furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF62− and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF62− during hydrolysis process were also studied. In the hydrolysis process, the TiF62− is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800 °C and 1000 °C, respectively.

  • transformation of ti bearing mineral in panzhihua Electric Furnace titanium slag during oxidation roasting process
    Journal of Thermal Analysis and Calorimetry, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Wenting Duan, Shuai Wang
    Abstract:

    The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.

  • removal of magnesium and calcium from Electric Furnace titanium slag by h3po4 oxidation roasting leaching process
    Transactions of Nonferrous Metals Society of China, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Shuai Wang
    Abstract:

    Abstract H3PO4 oxidation roasting followed by HCl acid leaching was proposed to remove magnesium and calcium from Electric Furnace titanium slag containing 3.12% MgO and 0.86% CaO. XRF, XRD and SEM techniques were used to characterize the composition, mineral phase component and microstructure of the titanium slag. The H3PO4 oxidation thermodynamic, mineral phase transformation, microstructure, element distribution in titanium slag during H3PO4 oxidation process and leaching process were investigated. The thermodynamic analysis indicated that H3PO4 could promote the decomposition of MgTi2O5 and CaSiO3. The results indicated that H3PO4 could effectively promote the transformation of titanium-bearing mineral to rutile and enrich the impurities in MxTi3–xO5 into phosphate which could be removed by acid leaching process. Under the studied conditions, the leaching rates of magnesium and calcium reached 94.68% and 87.19%, respectively. The acid leached slag containing 0.19% MgO and 0.13% CaO (mass fraction) was obtained.

  • effects of basicity and mgo in slag on the behaviors of smelting vanadium titanomagnetite in the direct reduction Electric Furnace process
    Metals, 2016
    Co-Authors: Shuai Wang, Feng Chen, Fuqiang Zheng
    Abstract:

    The effects of basicity and MgO content on reduction behavior and separation of iron and slag during smelting vanadium titanomagnetite by Electric Furnace were investigated. The reduction behaviors affect the separation of iron and slag in the direct reduction-Electric Furnace process. The recovery rates of Fe, V, and Ti grades in iron were analyzed to determine the effects of basicity and MgO content on the reduction of iron oxides, vanadium oxides, and titanium oxides. The chemical compositions of vanadium-bearing iron and main phases of titanium slag were detected by XRF and XRD, respectively. The results show that the higher level of basicity is beneficial to the reduction ofiron oxides and vanadium oxides, and titanium content dropped in molten iron with the increasing basicity. As the content of MgO increased, the recovery rate of Fe increased slightly but the recovery rate of V increased considerably. The grades of Ti in molten iron were at a low level without significant change when MgO content was below 11%, but increased as MgO content increased to 12.75%. The optimum conditions for smelting vanadium titanomagnetite were about 11.38% content of MgO and quaternary basicity was about 1.10. The product, vanadium-bearing iron, can be applied in the converter steelmaking process, and titanium slag containing 50.34% TiO2 can be used by the acid leaching method.

Feng Chen - One of the best experts on this subject based on the ideXlab platform.

  • Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution
    'MDPI AG', 2021
    Co-Authors: Fuqiang Zheng, Feng Chen, Shuai Wang, Yufeng Guo, Lingzhi Yang, Jinlai Zhang, Guanzhou Qiu
    Abstract:

    The effects of F− concentration, leaching temperature, and time on the Ti leaching from Ti-bearing Electric Furnace slag (TEFS) by [NH4+]-[F−] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F− concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS was controlled by surface chemical reaction. The semi-empirical kinetics equation was consistent with the real experimental results, with a correlation coefficient (R2) of 0.996. The Ti leaching rate reached 92.83% after leaching at 90 °C for 20 min with F− concentration of 14 mol/L and [NH4+]/[F−] ratio of 0.4. The leaching rates of Si, Fe, V, Mn, and Cr were 94.03%, 7.24%, 5.36%, 4.54%, and 1.73%, respectively. The Ca, Mg, and Al elements were converted to (NH4)3AlF6 and CaMg2Al2F12 in the residue, which can transform into stable oxides and fluorides after pyro-hydrolyzing and calcinating

  • a novel process for preparation of titanium dioxide from ti bearing Electric Furnace slag nh4hf2 hf leaching and hydrolyzing process
    Journal of Hazardous Materials, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Shuai Wang, Yufeng Guo, Guanzhou Qiu, Yulei Sui, Lingzhi Yang
    Abstract:

    Abstract A novel process to prepare titanium dioxide from Ti-bearing Electric Furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4+]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing Electric Furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF62− and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF62− during hydrolysis process were also studied. In the hydrolysis process, the TiF62− is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800 °C and 1000 °C, respectively.

  • removal of magnesium and calcium from Electric Furnace titanium slag by h3po4 oxidation roasting leaching process
    Transactions of Nonferrous Metals Society of China, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Shuai Wang
    Abstract:

    Abstract H3PO4 oxidation roasting followed by HCl acid leaching was proposed to remove magnesium and calcium from Electric Furnace titanium slag containing 3.12% MgO and 0.86% CaO. XRF, XRD and SEM techniques were used to characterize the composition, mineral phase component and microstructure of the titanium slag. The H3PO4 oxidation thermodynamic, mineral phase transformation, microstructure, element distribution in titanium slag during H3PO4 oxidation process and leaching process were investigated. The thermodynamic analysis indicated that H3PO4 could promote the decomposition of MgTi2O5 and CaSiO3. The results indicated that H3PO4 could effectively promote the transformation of titanium-bearing mineral to rutile and enrich the impurities in MxTi3–xO5 into phosphate which could be removed by acid leaching process. Under the studied conditions, the leaching rates of magnesium and calcium reached 94.68% and 87.19%, respectively. The acid leached slag containing 0.19% MgO and 0.13% CaO (mass fraction) was obtained.

  • transformation of ti bearing mineral in panzhihua Electric Furnace titanium slag during oxidation roasting process
    Journal of Thermal Analysis and Calorimetry, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Wenting Duan, Shuai Wang
    Abstract:

    The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.

  • effects of basicity and mgo in slag on the behaviors of smelting vanadium titanomagnetite in the direct reduction Electric Furnace process
    Metals, 2016
    Co-Authors: Shuai Wang, Feng Chen, Fuqiang Zheng
    Abstract:

    The effects of basicity and MgO content on reduction behavior and separation of iron and slag during smelting vanadium titanomagnetite by Electric Furnace were investigated. The reduction behaviors affect the separation of iron and slag in the direct reduction-Electric Furnace process. The recovery rates of Fe, V, and Ti grades in iron were analyzed to determine the effects of basicity and MgO content on the reduction of iron oxides, vanadium oxides, and titanium oxides. The chemical compositions of vanadium-bearing iron and main phases of titanium slag were detected by XRF and XRD, respectively. The results show that the higher level of basicity is beneficial to the reduction ofiron oxides and vanadium oxides, and titanium content dropped in molten iron with the increasing basicity. As the content of MgO increased, the recovery rate of Fe increased slightly but the recovery rate of V increased considerably. The grades of Ti in molten iron were at a low level without significant change when MgO content was below 11%, but increased as MgO content increased to 12.75%. The optimum conditions for smelting vanadium titanomagnetite were about 11.38% content of MgO and quaternary basicity was about 1.10. The product, vanadium-bearing iron, can be applied in the converter steelmaking process, and titanium slag containing 50.34% TiO2 can be used by the acid leaching method.

Guanzhou Qiu - One of the best experts on this subject based on the ideXlab platform.

  • Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution
    'MDPI AG', 2021
    Co-Authors: Fuqiang Zheng, Feng Chen, Shuai Wang, Yufeng Guo, Lingzhi Yang, Jinlai Zhang, Guanzhou Qiu
    Abstract:

    The effects of F− concentration, leaching temperature, and time on the Ti leaching from Ti-bearing Electric Furnace slag (TEFS) by [NH4+]-[F−] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F− concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS was controlled by surface chemical reaction. The semi-empirical kinetics equation was consistent with the real experimental results, with a correlation coefficient (R2) of 0.996. The Ti leaching rate reached 92.83% after leaching at 90 °C for 20 min with F− concentration of 14 mol/L and [NH4+]/[F−] ratio of 0.4. The leaching rates of Si, Fe, V, Mn, and Cr were 94.03%, 7.24%, 5.36%, 4.54%, and 1.73%, respectively. The Ca, Mg, and Al elements were converted to (NH4)3AlF6 and CaMg2Al2F12 in the residue, which can transform into stable oxides and fluorides after pyro-hydrolyzing and calcinating

  • a novel process for preparation of titanium dioxide from ti bearing Electric Furnace slag nh4hf2 hf leaching and hydrolyzing process
    Journal of Hazardous Materials, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Shuai Wang, Yufeng Guo, Guanzhou Qiu, Yulei Sui, Lingzhi Yang
    Abstract:

    Abstract A novel process to prepare titanium dioxide from Ti-bearing Electric Furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4+]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing Electric Furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF62− and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF62− during hydrolysis process were also studied. In the hydrolysis process, the TiF62− is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800 °C and 1000 °C, respectively.

  • removal of magnesium and calcium from Electric Furnace titanium slag by h3po4 oxidation roasting leaching process
    Transactions of Nonferrous Metals Society of China, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Shuai Wang
    Abstract:

    Abstract H3PO4 oxidation roasting followed by HCl acid leaching was proposed to remove magnesium and calcium from Electric Furnace titanium slag containing 3.12% MgO and 0.86% CaO. XRF, XRD and SEM techniques were used to characterize the composition, mineral phase component and microstructure of the titanium slag. The H3PO4 oxidation thermodynamic, mineral phase transformation, microstructure, element distribution in titanium slag during H3PO4 oxidation process and leaching process were investigated. The thermodynamic analysis indicated that H3PO4 could promote the decomposition of MgTi2O5 and CaSiO3. The results indicated that H3PO4 could effectively promote the transformation of titanium-bearing mineral to rutile and enrich the impurities in MxTi3–xO5 into phosphate which could be removed by acid leaching process. Under the studied conditions, the leaching rates of magnesium and calcium reached 94.68% and 87.19%, respectively. The acid leached slag containing 0.19% MgO and 0.13% CaO (mass fraction) was obtained.

  • transformation of ti bearing mineral in panzhihua Electric Furnace titanium slag during oxidation roasting process
    Journal of Thermal Analysis and Calorimetry, 2018
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Wenting Duan, Shuai Wang
    Abstract:

    The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.

  • kinetics of hydrochloric acid leaching of titanium from titanium bearing Electric Furnace slag
    JOM, 2016
    Co-Authors: Fuqiang Zheng, Tao Jiang, Feng Chen, Yufeng Guo, Andrew Yakovlevich Travyanov, Guanzhou Qiu
    Abstract:

    The hydrochloric acid leaching of titanium from titanium-bearing Electric Furnace slag was investigated under different experimental conditions. The results indicate that particle size, hydrochloric acid concentration and reaction temperature were of significance to the leaching kinetics. Specifically, reaction temperature was the most important factor followed by hydrochloric acid concentration and particle size. The shrinking core model was used to describe the leaching process which was controlled by surface chemical reaction. The kinetic equation was obtained and the activation energy was found to be 43.16 kJ/mol. Iron and calcium species were almost completely dissolved in the acid when the extraction degree of titanium reached 99.84%. MgO (19.34 wt.%) and Al2O3 (32.45 wt.%) in the spinel were still in the leaching residue and SiO2 (43.53 wt.%) in the form of quartz remained in the leaching residue.