废弃水氯镁石微量杂质脱除制电解原料研究

Study on Removal Technologies of Microscale Impurities from MgCl_2 for Making Electrolysis Raw Materials

青海地区以光卤石为原料生产氯化钾,大量排放废弃水氯镁石,多年的排放积累严重影响到察尔汗盐湖的卤水成分平衡,同时已影响到钾肥的生产,当地称其为"镁害"。变废为宝的最优途径是将水氯镁石脱水进行电解得到金属镁,对电解过程有害的杂质主要是SO42-、Fe2+、B3+。文章通过离心、筛分、反应等物理、化学手段对水氯镁石进行净化处理,使得水氯镁石中SO42-≤30×10-6;Fe2++Fe3+≤5×10-6;B3+≤3×10-6,达到了电解原料的要求,文中各离子浓度的测量选用分光光度法,文章为资源有效利用和当地环境问题的解决提供了途径。

Nowadays,there is 'harmful magnesium' in Qinghai province.For so much bischofite were discarded after production of potassium chloride.More and more discarded bischofite were put on the ground for many years,they had harmful effects on balance of brine species and production of potassium chloride.The best way to make discarded bischofite become useful resources is to electrolysis bischofite to get magnesium.But there are some minim harmful impurities in bischofite for electrolysis process,such as SO42-、Fe2+、B3+.In this paper,a suitable way to utilize resources and solve environmental problem in the local was supplied.Through centrifugation,sieving and some chemical reaction,the concentration of SO42-,iron and boron in bischofite kept less than30,5,3mg/kg,respectively.Those bischofite can be used to electrolysis for magnesium production.And spectrophotometric determinations of SO42-,iron and boron in solutions were used in the paper.