富硼渣盐酸法制取硼酸和氢氧化镁

李杰¹，许哲峰²，李岩²，李英楠³，姜涛³

(1. 内蒙古工业大学 材料科学与工程学院，内蒙古 呼和浩特，010051；
2. 内蒙古化工职业学院 化学工程系，内蒙古 呼和浩特，010070；
3. 东北大学 材料与冶金学院，辽宁 沈阳，110004)

摘 要：采用富硼渣盐酸法来处理富硼渣，通过单因素试验和正交试验确定富硼渣盐酸浸出的最佳试验条件。针对盐酸浸出液，开发了制备硼酸联产氢氧化镁和硫酸钙工艺。研究结果表明：浸出温度为95 ℃，盐酸用量为理论用量的95%，浸出时间为40 min，浸出液固比为1:1时，B浸出率为94.60%，Mg浸出率达到90.56%。制得的硼酸纯度为99.55%，氢氧化镁的纯度达到80%以上，副产品硫酸钙纯度达到98.81%。

关键词：富硼渣；盐酸浸出；硼酸；氢氧化镁；浸出率

Preparation of boric acid and magnesium hydroxide from boron-rich slag by hydrochloric acid leaching method

LI Jie¹, XU Zhe-feng², LI Yan², LI Ying-nan³, JIANG Tao³

(1. School of Materials Science & Engineering, Inner Mongolia University of Technology, Hohhot 010051,China;
2. College of Chemical Engineering, Inner Mongolia Vocational College of Chemical Engineering,
Hohhot 010070, China;
3. School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China)

Abstract:Hydrochloric acid was used to decompose boron-rich slag. The boron-rich slag hydrochloric acid leaching of the best test conditions were determined by single factor experiments and orthogonal test. The process of preparation of boric acid and magnesium hydroxide cogeneration calcium sulfate was developed for dealing with hydrochloric acid leaching solution. The results show that the optimum parameters are leaching temperature of 95 ℃, the amount of hydrochloric acid of 95% of theoretical dosage, leaching time of 40 min and leaching liquid to solid ratio of 1:1. Under these conditions, the leaching rates of B and Mg are 94.60% and 90.56%, respectively. The purity of boric acid obtained by this method is 99.55%, and those of magnesium hydroxide and by-product calcium sulfate are over 80% and 98.81%, respectively.

Key words:boron-rich slag; hydrochloric acid leaching; boric acid; magnesium hydroxide; leaching rate