摘要
采用平衡法测定了263.15~298.15 K内,硫酸镁在硫酸水溶液中的溶解度。结果表明,随溶液温度的降低或硫酸浓度的增加,硫酸镁溶解度减小。分别用Apelblat方程、经验方程和(CNIBS)/Redlich-Kister方程对溶解度数据进行关联,发现(CNIBS)/Redlich-Kister方程的关联效果最好,其总平均相对偏差为0.41%。采用修正的Van′t-Hoof方程计算得到硫酸镁在硫酸水溶液中的溶解熵、溶解焓和标准吉布斯自由能变。结果表明,硫酸镁溶解过程为自发的吸热、熵增过程且熵变是影响该过程的主要因素。实验结果可为湿法炼锌废电解液低温结晶脱除硫酸镁的技术研发提供数据支撑。
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 decrease with the decrease of temperature or the increases of sulfuric acid concentration.The solubility data was correlated by Apelblat equation,empirical equation.(CNIBS)/Redlich-Kister equation,and(CNIBS)/Redlich-Kister equation has the best correlation effect,the average relative deviation is 0.41%.The changes of entropy,enthalpy and Gibbs free energy of the dissolving process were obtained by modified Van′t-Hoof equation.The results show that the dissolving process of magnesium sulfate was a spontaneous process of endothermic and 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.
作者
李永勇
金鑫
李兴彬
魏昶
彭晓华
江国豪
邓志敢
LI Yong-yong;JIN Xin;LI Xing-bin;WEI Chang;PENG Xiao-hua;JIANG Guo-hao;DENG Zhigan(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《矿冶》
CAS
2021年第6期79-85,共7页
Mining And Metallurgy
基金
国家重点研发计划项目(2018YFC1900402)
国家自然科学基金资助项目(51664030,51804146,51964029)。
关键词
平衡法
硫酸镁
湿法炼锌
溶解度
结晶
热力学性质
equilibrium method
magnesium sulfate
zinc hydrometallurgy
solubility
crystallization
thermodynamic properties
作者简介
第一作者:李永勇,硕士研究生,冶金工程专业;通信作者:李兴彬,教授,博士,研究方向为工业结晶,E-mail:lixingbin2018@163.com。
