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Qiyuan Chen - One of the best experts on this subject based on the ideXlab platform.
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dissolution of zinc silicate hemimorphite with ammonia Ammonium Chloride solution
Hydrometallurgy, 2010Co-Authors: Zhiying Ding, Huiping Hu, Qiyuan ChenAbstract:Abstract XRD, IR, SEM and XPS analysis were carried out to study the dissolution behavior of hemimorphite in ammonia–Ammonium Chloride solution at 25 ± 0.5 °C. The results indicate that hemimorphite is soluble until its framework disintegrates. The residue possesses the characteristics of SiO 2 ·nH 2 O, which forms an amorphous SiO 2 layer on the hemimorphite surface. After ammonia–Ammonium Chloride dissolution, the relative abundance of zinc on the residue surface decreases with an increase of total ammonia concentration. XPS data shows that the Si 2p3/2 and O 1s spectra of the dissolved hemimorphite are broadened and shifted to higher binding energies during ammonia–Ammonium Chloride dissolution and that their binding energies are closer to SiO 2 (silica) with an increase of total ammonia and time.
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Dissolution of zinc silicate (hemimorphite) with ammonia–Ammonium Chloride solution
Hydrometallurgy, 2010Co-Authors: Zhiying Ding, Huiping Hu, Qiyuan ChenAbstract:Abstract XRD, IR, SEM and XPS analysis were carried out to study the dissolution behavior of hemimorphite in ammonia–Ammonium Chloride solution at 25 ± 0.5 °C. The results indicate that hemimorphite is soluble until its framework disintegrates. The residue possesses the characteristics of SiO 2 ·nH 2 O, which forms an amorphous SiO 2 layer on the hemimorphite surface. After ammonia–Ammonium Chloride dissolution, the relative abundance of zinc on the residue surface decreases with an increase of total ammonia concentration. XPS data shows that the Si 2p3/2 and O 1s spectra of the dissolved hemimorphite are broadened and shifted to higher binding energies during ammonia–Ammonium Chloride dissolution and that their binding energies are closer to SiO 2 (silica) with an increase of total ammonia and time.
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Solubility prediction of malachite in aqueous ammoniacal Ammonium Chloride solutions at 25 °C
Hydrometallurgy, 2009Co-Authors: Xi Wang, Huiping Hu, Qiyuan Chen, Zhong-liang XiaoAbstract:Abstract The solubility of malachite in the presence of ammonia, Ammonium Chloride and their mixed solution is calculated by a geochemical modeling code and is measured in a series of dissolution experiments using synthetic malachite at 25 °C. The simulated results show a good agreement with the experimental data gained at 25 °C. The predicted and experimental results indicate that the precipitate CuO limits the copper solubility in aqueous ammonia and Cu(OH) 1.5 Cl 0.5 in aqueous Ammonium Chloride. For a mixed solution containing ammonia and Ammonium Chloride, highest copper solubility can be achieved by adjusting the [NH 3 ]/[NH 4 Cl] ratio to about 2:1. The thermodynamic model presented rationalises the interactions between the different components and predicts the influence of changes in the concentration of ammonia and Ammonium Chloride on the copper solubility of malachite.
R. I. Kraidenko - One of the best experts on this subject based on the ideXlab platform.
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Preparation of High-Purity Iron by Means of Ammonium Chloride Complexes
Russian Journal of Inorganic Chemistry, 2018Co-Authors: A. N. D’yachenko, R. I. Kraidenko, A. A. SmorokovAbstract:A method for the preparation of high-purity iron via the chlorination of a mixture containing iron(III) oxide by Ammonium Chloride with the subsequent decomposition of the intermediate product to iron(III) Chloride, its sublimation, and further reduction in a hydrogen flow was proposed. The reaction between Ammonium Chloride and iron(III) oxide and the thermal decomposition of the Ammonium Chloride complex were thermogravimetrically studied. The conditions and energetic characteristics of these reactions were determined. The method was tested on iron-containing raw materials. The impurities in the end product of reduction by hydrogen were 0.25%.
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Breakdown of copper-smelting slags with Ammonium Chloride
Russian Journal of Non-ferrous Metals, 2013Co-Authors: A. N. D’yachenko, R. I. Kraidenko, E. B. Poryvai, S. N. ChegrintsevAbstract:A hydrometallurgical method for processing copper-smelting slags with the help of Ammonium Chloride is proposed. A production flowchart of the process stage is developed. Breakdown of the slag with the help of Ammonium Chloride is investigated and recommendations on the equipment implementation of the process are given. The copper-smelting slag is formed by minerals Fe2SiO4, Zn2SiO4, CuFe2O4, and Ca2SiO4. Breakdown should be performed at 280°C for 4 h with constant stirring and ratio slag: Ammonium Chloride = 1: 2.
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Chlorination of Copper-Containing Raw Material by Ammonium Chloride
Russian Journal of Applied Chemistry, 2013Co-Authors: O. V. Grineva, A. N. D’yachenko, R. I. KraidenkoAbstract:A new method of processing the copper-containing raw material to copper(II) oxide was suggested and examined based on the chlorination of copper-containing raw material with Ammonium Chloride followed by dissolution of copper Chloride, precipitation of copper hydroxide from a solution and its calcining to copper(II) oxide. Thermogravimetric analysis of the process was conducted. Kinetics of chlorination of copper(II) oxide by Ammonium Chloride was experimentally investigated. Technological scheme of the copper-containing raw material processing with Ammonium Chloride was suggested.
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Mechanism of Reaction between Cobalt(II) Oxide and Ammonium Chloride
Russian Journal of Inorganic Chemistry, 2012Co-Authors: V. A. Borisov, A. N. D’yachenko, R. I. KraidenkoAbstract:A reaction between cobalt oxide and Ammonium Chloride was studied. A possible mechanism of this reaction was determined by TGA and DSC. The reaction products were identified by IR spectroscopy, chemical and XRD analyses. A multistage mechanism was established for reaction between cobalt oxide and Ammonium Chloride. Cobalt Chloride was determined to be the final product; the reaction occurs via the formation and decomposition of (NH4)3CoCl5, (NH4)2CoCl4, and NH4CoCl3.
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Reaction of zinc oxide with Ammonium Chloride
Russian Journal of Inorganic Chemistry, 2012Co-Authors: V. A. Borisov, A. N. D’yachenko, R. I. KraidenkoAbstract:The reaction of Ammonium Chloride with zinc oxide was studied kinetically and thermogravimetrically. Reaction products were identified by IR spectroscopy and X-ray powder diffraction. Ammonium chlorozincates were found to form in the reaction and to decompose to zinc Chloride.
Zhiying Ding - One of the best experts on this subject based on the ideXlab platform.
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dissolution of zinc silicate hemimorphite with ammonia Ammonium Chloride solution
Hydrometallurgy, 2010Co-Authors: Zhiying Ding, Huiping Hu, Qiyuan ChenAbstract:Abstract XRD, IR, SEM and XPS analysis were carried out to study the dissolution behavior of hemimorphite in ammonia–Ammonium Chloride solution at 25 ± 0.5 °C. The results indicate that hemimorphite is soluble until its framework disintegrates. The residue possesses the characteristics of SiO 2 ·nH 2 O, which forms an amorphous SiO 2 layer on the hemimorphite surface. After ammonia–Ammonium Chloride dissolution, the relative abundance of zinc on the residue surface decreases with an increase of total ammonia concentration. XPS data shows that the Si 2p3/2 and O 1s spectra of the dissolved hemimorphite are broadened and shifted to higher binding energies during ammonia–Ammonium Chloride dissolution and that their binding energies are closer to SiO 2 (silica) with an increase of total ammonia and time.
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Dissolution of zinc silicate (hemimorphite) with ammonia–Ammonium Chloride solution
Hydrometallurgy, 2010Co-Authors: Zhiying Ding, Huiping Hu, Qiyuan ChenAbstract:Abstract XRD, IR, SEM and XPS analysis were carried out to study the dissolution behavior of hemimorphite in ammonia–Ammonium Chloride solution at 25 ± 0.5 °C. The results indicate that hemimorphite is soluble until its framework disintegrates. The residue possesses the characteristics of SiO 2 ·nH 2 O, which forms an amorphous SiO 2 layer on the hemimorphite surface. After ammonia–Ammonium Chloride dissolution, the relative abundance of zinc on the residue surface decreases with an increase of total ammonia concentration. XPS data shows that the Si 2p3/2 and O 1s spectra of the dissolved hemimorphite are broadened and shifted to higher binding energies during ammonia–Ammonium Chloride dissolution and that their binding energies are closer to SiO 2 (silica) with an increase of total ammonia and time.
A. N. D’yachenko - One of the best experts on this subject based on the ideXlab platform.
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Preparation of High-Purity Iron by Means of Ammonium Chloride Complexes
Russian Journal of Inorganic Chemistry, 2018Co-Authors: A. N. D’yachenko, R. I. Kraidenko, A. A. SmorokovAbstract:A method for the preparation of high-purity iron via the chlorination of a mixture containing iron(III) oxide by Ammonium Chloride with the subsequent decomposition of the intermediate product to iron(III) Chloride, its sublimation, and further reduction in a hydrogen flow was proposed. The reaction between Ammonium Chloride and iron(III) oxide and the thermal decomposition of the Ammonium Chloride complex were thermogravimetrically studied. The conditions and energetic characteristics of these reactions were determined. The method was tested on iron-containing raw materials. The impurities in the end product of reduction by hydrogen were 0.25%.
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Breakdown of copper-smelting slags with Ammonium Chloride
Russian Journal of Non-ferrous Metals, 2013Co-Authors: A. N. D’yachenko, R. I. Kraidenko, E. B. Poryvai, S. N. ChegrintsevAbstract:A hydrometallurgical method for processing copper-smelting slags with the help of Ammonium Chloride is proposed. A production flowchart of the process stage is developed. Breakdown of the slag with the help of Ammonium Chloride is investigated and recommendations on the equipment implementation of the process are given. The copper-smelting slag is formed by minerals Fe2SiO4, Zn2SiO4, CuFe2O4, and Ca2SiO4. Breakdown should be performed at 280°C for 4 h with constant stirring and ratio slag: Ammonium Chloride = 1: 2.
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Chlorination of Copper-Containing Raw Material by Ammonium Chloride
Russian Journal of Applied Chemistry, 2013Co-Authors: O. V. Grineva, A. N. D’yachenko, R. I. KraidenkoAbstract:A new method of processing the copper-containing raw material to copper(II) oxide was suggested and examined based on the chlorination of copper-containing raw material with Ammonium Chloride followed by dissolution of copper Chloride, precipitation of copper hydroxide from a solution and its calcining to copper(II) oxide. Thermogravimetric analysis of the process was conducted. Kinetics of chlorination of copper(II) oxide by Ammonium Chloride was experimentally investigated. Technological scheme of the copper-containing raw material processing with Ammonium Chloride was suggested.
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Mechanism of Reaction between Cobalt(II) Oxide and Ammonium Chloride
Russian Journal of Inorganic Chemistry, 2012Co-Authors: V. A. Borisov, A. N. D’yachenko, R. I. KraidenkoAbstract:A reaction between cobalt oxide and Ammonium Chloride was studied. A possible mechanism of this reaction was determined by TGA and DSC. The reaction products were identified by IR spectroscopy, chemical and XRD analyses. A multistage mechanism was established for reaction between cobalt oxide and Ammonium Chloride. Cobalt Chloride was determined to be the final product; the reaction occurs via the formation and decomposition of (NH4)3CoCl5, (NH4)2CoCl4, and NH4CoCl3.
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Reaction of zinc oxide with Ammonium Chloride
Russian Journal of Inorganic Chemistry, 2012Co-Authors: V. A. Borisov, A. N. D’yachenko, R. I. KraidenkoAbstract:The reaction of Ammonium Chloride with zinc oxide was studied kinetically and thermogravimetrically. Reaction products were identified by IR spectroscopy and X-ray powder diffraction. Ammonium chlorozincates were found to form in the reaction and to decompose to zinc Chloride.
Huiping Hu - One of the best experts on this subject based on the ideXlab platform.
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dissolution of zinc silicate hemimorphite with ammonia Ammonium Chloride solution
Hydrometallurgy, 2010Co-Authors: Zhiying Ding, Huiping Hu, Qiyuan ChenAbstract:Abstract XRD, IR, SEM and XPS analysis were carried out to study the dissolution behavior of hemimorphite in ammonia–Ammonium Chloride solution at 25 ± 0.5 °C. The results indicate that hemimorphite is soluble until its framework disintegrates. The residue possesses the characteristics of SiO 2 ·nH 2 O, which forms an amorphous SiO 2 layer on the hemimorphite surface. After ammonia–Ammonium Chloride dissolution, the relative abundance of zinc on the residue surface decreases with an increase of total ammonia concentration. XPS data shows that the Si 2p3/2 and O 1s spectra of the dissolved hemimorphite are broadened and shifted to higher binding energies during ammonia–Ammonium Chloride dissolution and that their binding energies are closer to SiO 2 (silica) with an increase of total ammonia and time.
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Dissolution of zinc silicate (hemimorphite) with ammonia–Ammonium Chloride solution
Hydrometallurgy, 2010Co-Authors: Zhiying Ding, Huiping Hu, Qiyuan ChenAbstract:Abstract XRD, IR, SEM and XPS analysis were carried out to study the dissolution behavior of hemimorphite in ammonia–Ammonium Chloride solution at 25 ± 0.5 °C. The results indicate that hemimorphite is soluble until its framework disintegrates. The residue possesses the characteristics of SiO 2 ·nH 2 O, which forms an amorphous SiO 2 layer on the hemimorphite surface. After ammonia–Ammonium Chloride dissolution, the relative abundance of zinc on the residue surface decreases with an increase of total ammonia concentration. XPS data shows that the Si 2p3/2 and O 1s spectra of the dissolved hemimorphite are broadened and shifted to higher binding energies during ammonia–Ammonium Chloride dissolution and that their binding energies are closer to SiO 2 (silica) with an increase of total ammonia and time.
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Solubility prediction of malachite in aqueous ammoniacal Ammonium Chloride solutions at 25 °C
Hydrometallurgy, 2009Co-Authors: Xi Wang, Huiping Hu, Qiyuan Chen, Zhong-liang XiaoAbstract:Abstract The solubility of malachite in the presence of ammonia, Ammonium Chloride and their mixed solution is calculated by a geochemical modeling code and is measured in a series of dissolution experiments using synthetic malachite at 25 °C. The simulated results show a good agreement with the experimental data gained at 25 °C. The predicted and experimental results indicate that the precipitate CuO limits the copper solubility in aqueous ammonia and Cu(OH) 1.5 Cl 0.5 in aqueous Ammonium Chloride. For a mixed solution containing ammonia and Ammonium Chloride, highest copper solubility can be achieved by adjusting the [NH 3 ]/[NH 4 Cl] ratio to about 2:1. The thermodynamic model presented rationalises the interactions between the different components and predicts the influence of changes in the concentration of ammonia and Ammonium Chloride on the copper solubility of malachite.
