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| Determination and correlation of solubility of magnesium sulfate in sulphuric acid solution |
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Received:March 06, 2021
Revised:March 23, 2021
Accepted:March 24, 2021
Published Online:April 27, 2022
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| DOI： |
| KeyWord:Equilibrium method; Magnesium sulfate; Zinc hydrometallurgy; Solubility; crystallization; Thermodynamic properties |
| Author | Institution |
| Yongyong |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
| JIN Xin |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
| LI Xingbin |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
| WEI Chang |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
| PENG Xiaohua |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
| JIANG Guohao |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
| DENG Zhigan |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming;Yunnan,China |
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| Abstract: |
| The solubility of magnesium sulfate in sulphuric acid solution was determined by equilibrium method in the temperature from T=(263.15 to 298.15)K.The results show that the solubility of magnesium sulfate decreases with the decreases of temperature or the increases of sulfuric acid concentration.The solubility data was correlated by Apelblat equation,empirical equation and (CNIBS)/Redlich-Kister equation,and (CNIBS)/Redlich-Kister equation has the best correlation effect,the average relative deviation is 0.41%, and the root mean square deviation is less than 3×10-4. The changes of entropy(ΔSd)、enthalpy(ΔHd) and Gibbs free energy (ΔGd) of the dissolving process were obtained by modified vant-Hoof equation.The results show that the process of magnesium sulfateSdissolving was a spontaneous process of endothermicSand entropy-increasing and enthalpy change was the main factor affecting the dissolution process. The experimental results can provide data support for the research of magnesium sulfate removal technology by low temperature crystallization from the waste electrolyte of zinc hydrometallurgy. |
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