摘要
利用Pitzer电解质溶液理论,回归25℃、252℃、301℃、352℃条件下Na2WO4和0~350℃范围内NaOH溶液的Pitzer参数。在不考虑混合电解质相互作用系数的情况下,利用所计算的Pitzer参数及文献测得的NaOH分解白钨矿的反应平衡浓度,用插值法计算了70℃下不同浓度NaOH（0.69~3.15 mol.L-1）分解白钨的热力学平衡常数（均为14.4×104-左右）,证实计算所得Na2WO4和NaOH溶液的Pitzer参数是可信的。由此可见,利用Na2WO4和NaOH的Pitzer参数可对Na2WO4和NaOH溶液体系的热力学性质进行预测。
Pitzer parameters for Na2WO4 at 25 ℃,252 ℃,301 ℃,352 ℃ and NaOH from 0 ℃ to 350 ℃ are regressed by Pitzer electrolyte solution theory.Adopting these parameters got and using the data of equilibrium concentrations got from literature,the thermodynamic equilibrium constant of sodium hydroxide decomposition of scheelite at 70 ℃ in different NaOH concentrations（0.69~3.15 mol？L？1） is calculated,ignoring the mutual effect coefficient of the mixing electrolytes.And the constant is stable in around 14.44×10？4,which proves that the parameters adopted in the calculation are credible.So,the thermodynamic properties of Na2WO4 and NaOH solution systems could be predicated by using the Pitzer parameters of Na2WO4 and NaOH.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2012年第1期32-38,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家863高技术研究发展计划资助项目(2007AA06Z129)
