SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (2): 267-276.

• CHEMICAL ENGINEERING THERMODYNAMICS • 上一篇    下一篇

Chemical Modeling of Nesquehonite Solubility in Li+Na+K+NH4+Mg+Cl+H2O System with a Speciation-based Approach

王道广, 李志宝   

  1. 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 修回日期:2011-08-09 出版日期:2012-04-28 发布日期:2012-05-02
  • 通讯作者: LI Zhibao
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21076212,21076213,21146006);the National Basic Research Program of China (2009CB219904);Key Program in Science and Technology of Qinghai Province (2010-G-A4)

Chemical Modeling of Nesquehonite Solubility in Li+Na+K+NH4+Mg+Cl+H2O System with a Speciation-based Approach

WANG Daoguang, LI Zhibao   

  1. 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 Revised:2011-08-09 Online:2012-04-28 Published:2012-05-02
  • Supported by:
    Supported by the National Natural Science Foundation of China (21076212,21076213,21146006);the National Basic Research Program of China (2009CB219904);Key Program in Science and Technology of Qinghai Province (2010-G-A4)

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. MgCO30 MgHCO3+,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 Mg/CO32- 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. MgCO30 MgHCO3+,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 Mg/CO32- bearing species distribution,activity coefficient and pH changes.

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