天然结晶水氯镁石提纯及轻烧氧化镁制备研究  

Study on the Purification of Bischofite Brine and Preparation of Lightly Burned Magnesium Oxide

作　　者：姜丽鑫 秦柏森 孙侨阳 温天朋 于景坤 JIANG Lixin;QIN Bosen;SUN Qiaoyang;WEN Tianpeng;YU Jingkun(Northeastern University,School of Metallurgy,Shen Yang,110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《盐湖研究》2024年第6期65-70,共6页Journal of Salt Lake Research

基　　金：国家自然科学基金项目(52372022)。

摘　　要：为了高效资源化利用青海盐湖提钾后产生的天然结晶水氯镁石,文章提出了一种水氯镁石提纯和轻烧氧化镁制备的方法。该方法利用氯化镁、氯化钾和氯化钠在无水乙醇中的溶解性差异,采用溶解-析出法使氯化钾和氯化钠杂质从氯化镁溶液中分离,获得高纯度的水氯镁石(MgCl_(2)·6H_(2)O)。然后,以提纯得到的水氯镁石为原料,通过直接分解法制备高纯度的轻烧氧化镁。结果表明,通过溶解-析出法可以使氯化钾和氯化钠杂质从氯化镁溶液中分离,获得纯度达99.82%的水氯镁石;分解水氯镁石,可以获得纯度为99.50%的高纯度氧化镁。研究结果对于高效资源化利用青海盐湖提钾后产生的天然结晶水氯镁石具有重要意义。In order to efficiently utilize the natural crystalline bischofite produced after potassium extraction from Qinghai Salt Lake,this paper proposes a new method for purifying bischofite and preparing light burned magnesium oxide.The high-purity bischofites were obtained by the dissolution-precipitation method to separating the impurities of potassium chloride and sodium chloride from magnesium chloride solution using the solubility differences of magnesium chloride,potassium chloride,and sodium chloride in anhydrous ethanol in this study.And then,the high-purity light burned magnesium oxide was prepared by direct decomposition method using purified salt lake brine as raw material.The results showed that a purity of 99.82%bischofite(MgCl_(2)·6H_(2)O)could be obtained by separating the potassium chloride and sodium chloride impurities from magnesium chloride solution of the salt lake through the dissolution-precipitation method,and the high-purity magnesium oxide with a purity of 99.50%was obtained by decomposing the bischofite.The research results are of great significance for the efficient resource utilization of the natural crystalline bischofite produced after potassium extraction from Qinghai Salt Lake.

关 键 词：水氯镁石 氯化镁 提纯 氧化镁 无水乙醇 

分 类 号：TF822[冶金工程—有色金属冶金]