高矿化度矿井水热法脱盐过程中硫酸钙的结垢趋势预测及验证  

Prediction and verification of calcium sulfate scaling trend in hydrothermal desalination process of high salinity mine

作　　者：唐元晖 柏元吉[2,3] 郭强 何晓磊 余立新 林亚凯 王晓琳 TANG Yuanhui;BAI Yuanji;GUO Qiang;HE Xiaolei;YU Lixin;LIN Yakai;WANG Xiaolin(State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,National Institute of Clean-and-Low-Carbon Energy,Beijing 102209,China;College of Chemistry and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China;Key Laboratory of Membrane Materials and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China;China Huaneng Clean Energy Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]北京低碳清洁能源研究院,煤炭开采水资源保护与利用全国重点实验室,北京102209 [2]中国矿业大学(北京)化学与环境工程学院,北京100083 [3]清华大学化学工程系,膜材料与工程北京市重点实验室,北京100084 [4]中国华能清洁能源研究院有限公司,北京102209

出　　处：《化工学报》2025年第1期81-92,F0002,共13页CIESC Journal

基　　金：煤炭开采水资源保护与利用国家重点实验室2020年开放基金课题项目(GJNY-20-113-09);中央高校基本科研业务费专项资金项目(2022YQHH04,2022YJSHH14,2023ZKPYHH04);北京市自然科学基金项目(2232018);国家自然科学基金面上项目(22378225);国家重点研发计划项目(2022YFC2105103)。

摘　　要：高矿化度矿井水具有成分复杂、含盐量高、硬度大的特点,在热法脱盐过程中会产生以CaSO_(4)为主的无机垢。根据高矿化度矿井水的典型组成,配制含有Ca^(2+)-Mg^(2+)-Na^(+)-Cl^(-)-SO_(4)^(2-)的模拟原料液,首先采用恒温溶解法,考察温度为40、50、60、70℃时CaSO_(4)在Ca^(2+)-Mg^(2+)-Na^(+)-Cl^(-)-SO_(4)^(2-)体系的溶解度。结果表明:在40~70℃的范围内,CaSO_(4)的溶解度随温度的升高而减小,随MgCl_(2)浓度的增加而增大,随Na_(2)SO_(4)浓度的增加而减小。采用Oddo-Tomson饱和指数法,对CaSO_(4)在热法脱盐过程的结垢趋势进行预测,得到修正的饱和指数(SI)方程,该方程预测结果与65℃下CaSO_(4)在不锈钢管表面的结垢实验相吻合。且当饱和指数大于0.2时,Ca^(2+)-Mg^(2+)-Na^(+)-Cl^(-)-SO_(4)^(2-)体系中的CaSO_(4)晶体开始在不锈钢管表面析出,最后采用模拟高矿化度矿井水SA和SB的结垢实验说明本方法在实际矿井水应用的可行性和局限性。The highly mineralized mine water is characterized by its complex composition,high salinity,and significant hardness,which leads to the formation of inorganic scales during thermal desalination processes,primarily composed of CaSO_(4).Based on the typical composition of highly mineralized mine water,a simulated feed solution containing Ca^(2+),Mg^(2+),Na^(+),Cl^(-),and SO_(4)^(2-)was prepared.The solubility of CaSO_(4)in the Ca^(2+)-Mg^(2+)-Na^(+)-Cl^(-)-SO_(4)^(2-)system was then investigated using an isothermal dissolution method at temperatures of 40,50,60,and 70℃.The results indicate that within the temperature range of 40℃to 70℃,the solubility of CaSO_(4)decreases with increasing temperature,increases with higher MgCl_(2)concentration,and decreases with higher Na_(2)SO_(4)concentration.The Oddo-Tomson saturation index method was used to predict the scaling trend of CaSO_(4)in the thermal desalination process,and the modified saturation index(SI)equation was obtained.The prediction results of this equation are consistent with the scaling experiment of CaSO_(4)on the surface of stainless steel pipe at 65℃.When the saturation index exceeded 0.2,CaSO_(4)crystals began to precipitate on the surface of stainless steel tubes in the Ca^(2+)-Mg^(2+)-Na^(+)-Cl^(-)-SO_(4)^(2-)system.Finally,scaling experiments using simulated high-mineralized mine water SA and SB were employed to demonstrate the feasibility and limitations of this method in practical mine water applications.

关 键 词：高矿化度矿井水 CaSO_(4) 饱和指数 结垢 热法脱盐 

分 类 号：TQ028.8[化学工程]