热分解重量法测定纯氯化镁溶液中氯化镁含量的研究

来源期刊：冶金分析2010年第11期

论文作者：何配华 尹霞 张宁 朱建

文章页码：58 - 61

关键词：氯化镁的分析； 氯化镁水合物； 热分解重量法

Key words：analysis of magnesium chloride； magnesium chloride hydrate； thermal decomposition gravimetric method

摘    要：针对用氯化银重量法测定MgCl₂溶液中MgCl₂含量存在的操作步骤较多、使用试剂较贵等不足,研究了一种新的简单、精确测定纯MgCl₂溶液中MgCl₂含量的方法,即热分解重量法。将精确称重后的纯MgCl₂溶液在低温下蒸发脱除部分水分,再在550~600℃温度下热分解6 h,使MgCl₂水合物转变为MgO,置于干燥器中冷却1.5~2 h后称重,即可换算得MgCl₂含量。本法较之氯化银重量法,平衡稳定性高,操作简单、无需昂贵试剂,适合于纯MgCl₂溶液中MgCl₂的快速测定。

Abstract: The silver chloride gravimetric method for the determination of magnesium chloride in pure magnesium chloride solution has some shortcomings such as long operation procedures and the use of expensive reagents.To solve these problems,a new simple and accurate determination method of magnesium chloride in pure magnesium chloride solution,i.e.,thermal decomposition gravimetric method,was studied.Pure magnesium chloride solution after accurately weighing was heated at low temperature to remove partial water.Then,it was thermally decomposed at 550-600 ℃ for 6 h,converting the magnesium chloride hydrate to magnesium oxide.After cooling in desiccator for 1.5-2 h,it was weighed to obtain the content of magnesium chloride.Compared to silver chloride gravimetric method,the equilibrium stability of this method was high,the operation was simple,and no expensive reagents were needed,so it was applicable for the rapid determination of magnesium chloride in pure magnesium chloride solution.