三水碳酸镁在Li + Na + K + NH4 + Mg + Cl + H2O体系中溶解度的全组分化学模拟

CIESC Journal ›› 2012, Vol. 20 ›› Issue (2): 267-276.

三水碳酸镁在Li + Na + K + NH₄ + Mg + Cl + H₂O体系中溶解度的全组分化学模拟

王道广, 李志宝

Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2011-03-28 出版日期:2012-04-28 发布日期:2011-08-09

Chemical modeling of nesquehonite solubility in Li + Na + K + NH₄ + Mg + Cl + H₂O system with a speciation-based approach

WANG Dao-Guang, LI Zhi-Bao

Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2011-03-28 Online:2012-04-28 Published:2011-08-09

摘要/Abstract

摘要： A chemical model, based on Pitzer activity coefficient model, is developed with a speciation approach to describe the solubility and chemistry of nesquehonite in concentrated chloride solutions. The chemical equilibrium constants for nesquehonite and aqueous species, i.e. , , and MgOH+, are precisely calculated as a function of temperature according to the Van’t Hoff equation by use of standard Gibbs free energy, standard formation enthalpy and heat capacity. The most recent solubility data are regressed to obtain new Pitzer parameters with good agreement. The predictive ability of the new model is improved significantly in comparison with previous models. The behavior of speciation chemistry for nesquehonite in various chloride media is explained through this modeling work on the basis of the bearing species distribution, activity coefficient and pH changes.

关键词: chemical modeling, speciation, equilibrium, nesquehonite solubility

Abstract: A chemical model, based on Pitzer activity coefficient model, is developed with a speciation approach to describe the solubility and chemistry of nesquehonite in concentrated chloride solutions. The chemical equilibrium constants for nesquehonite and aqueous species, i.e. , , and MgOH+, are precisely calculated as a function of temperature according to the Van’t Hoff equation by use of standard Gibbs free energy, standard formation enthalpy and heat capacity. The most recent solubility data are regressed to obtain new Pitzer parameters with good agreement. The predictive ability of the new model is improved significantly in comparison with previous models. The behavior of speciation chemistry for nesquehonite in various chloride media is explained through this modeling work on the basis of the bearing species distribution, activity coefficient and pH changes.

Key words: chemical modeling, speciation, equilibrium, nesquehonite solubility

王道广, 李志宝. 三水碳酸镁在Li + Na + K + NH₄ + Mg + Cl + H₂O体系中溶解度的全组分化学模拟[J]. CIESC Journal, 2012, 20(2): 267-276.

WANG Dao-Guang, LI Zhi-Bao. Chemical modeling of nesquehonite solubility in Li + Na + K + NH₄ + Mg + Cl + H₂O system with a speciation-based approach[J]. , 2012, 20(2): 267-276.

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三水碳酸镁在Li + Na + K + NH₄ + Mg + Cl + H₂O体系中溶解度的全组分化学模拟

Chemical modeling of nesquehonite solubility in Li + Na + K + NH₄ + Mg + Cl + H₂O system with a speciation-based approach

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