The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Wei Sun - One of the best experts on this subject based on the ideXlab platform.
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selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Jiande Gao, Sultan Ahmed Khoso, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
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Selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite/calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Ahmed Khoso, Jiande Gao, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
Wei Jiang - One of the best experts on this subject based on the ideXlab platform.
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selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Jiande Gao, Sultan Ahmed Khoso, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
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Selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite/calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Ahmed Khoso, Jiande Gao, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
Zhiyong Gao - One of the best experts on this subject based on the ideXlab platform.
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selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Jiande Gao, Sultan Ahmed Khoso, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
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Selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite/calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Ahmed Khoso, Jiande Gao, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
Jiande Gao - One of the best experts on this subject based on the ideXlab platform.
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selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Jiande Gao, Sultan Ahmed Khoso, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
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Selective adsorption of benzhydroxamic acid on Fluorite rendering selective separation of Fluorite/calcite
Applied Surface Science, 2018Co-Authors: Wei Jiang, Zhiyong Gao, Ahmed Khoso, Jiande Gao, Wei SunAbstract:Abstract Fluorite, a chief source of fluorine in the nature, usually coexists with calcite mineral in ore deposits. Worldwide, flotation techniques with a selective collector and/or a selective depressant are commonly preferred for the separation of Fluorite from calcite. In the present study, an attempt was made to use benzhydroxamic acid (BHA) as a collector for the selective separation of Fluorite from calcite without using any depressant. Results obtained from the flotation experiments for single mineral and mixed binary minerals revealed that the BHA has a good selective collecting ability for the Fluorite when 50 mg/L of BHA was used at pH of 9. The results from the zeta potential and X-ray photoelectron spectroscopy (XPS) indicated that the BHA easily chemisorbs onto the Fluorite as compared to calcite. Crystal chemistry calculations showed the larger Ca density and the higher Ca activity on Fluorite surface mainly account for the selective adsorption of BHA on Fluorite, leading to the selective separation of Fluorite from calcite. Moreover, a stronger hydrogen bonding with BHA and the weaker electrostatic repulsion with BHA− also contribute to the stronger interaction of BHA species with Fluorite surface.
Denis Fontignie - One of the best experts on this subject based on the ideXlab platform.
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The use of vein Fluorite as probe for paleofluid REE and Sr-Nd isotope geochemistry : The Santa Catarina Fluorite District, southern Brazil
Chemical Geology, 2005Co-Authors: Ricardo Sallet, Robert Moritz, Denis FontignieAbstract:Abstract Fluorite can be used as a probe for the source of Sr and REE, as well as for the Sr and Nd isotope systematics of mineralizing solutions, allowing characterization of the composition, oxidation state and sources of the fluids. The 87 Sr / 86 Sr ratios in vein Fluorite from the Santa Catarina Fluorite District, southern Brazil, are low (0.720 to 0.745) relative to those of the majority of host granites at the time of mineralization (90 Ma), but are similar to those of less abundant and less evolved Sr- and Ca-rich granites and plagioclases of the heterogeneous Pedras Grandes granite association. Major contributions of Sr from the unradiogenic Parana Basin rocks ( 87 Sr / 86 Sr 90 Ma = 0.705 to 0.718) are unlikely, considering the radiogenic character of the lower 87 Sr / 86 Sr end-member in Fluorite mixing lines. Estimated Fluorite fluid partition coefficients ( K d Sr–Ca = 0.019 and D Sr ≈ 600) indicate a Sr / Ca ratio in the Fluorite-forming solution of 0.012, and Sr contents of 0.05 to 0.25 ppm, which are similar to those of present-day granitic geothermal waters. Initial Nd isotopic compositions of the vein Fluorites (0.5120 to 0.512) are similar to those of the Pedras Grandes granites. The 143 Nd / 144 Nd 90 Ma of the evolved granites of the Tabuleiro granite association, their accessory Fluorites and the Parana Basin rocks are considerably more radiogenic (0.5120 to 0.5127) and these are thus considered to be unlikely sources of the fluids. The REE patterns of vein Fluorites, normalized to upper continental crust, show a range of LREE-depleted patterns, with highly variable positive and negative Eu anomalies. The host Pedras Grandes granites show flat to slightly depleted UCC normalized LREE patterns with strong negative Eu anomalies. Depletion of the LREE in Fluorites resulted from the mobility of HREE fluoride complexes during fluid migration. A REE fractionation model based on ionic potential ratios indicates that Eu 3+ was stable during fluid migration and Fluorite precipitation. The coexistence of pyrite and Eu 3+ in the mineralizing fluids is consistent with low pH and oxygen fugacities near the hematite–magnetite buffer.