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以稀土冶炼分离过程中产生的氯化镁废水和白云石为原料制备氢氧化镁,然后采用碳化法制备高纯碳酸氢镁溶液,研究了铁杂质离子的行为与影响。结果表明:碳酸氢镁溶液中的杂质铁是由于二价固态铁发生碳化反应而引入并以重碳酸亚铁(Fe(HCO3)2)形式存在,即碳化反应过程是除铁的核心工序,Mg(HCO3)2溶液经过除铁后沉淀稀土离子可以明显降低沉淀产物中铁杂质含量。本文为氯化镁废水-白云石碳化法制备碳酸氢镁溶液过程中铁杂质离子的去除提供切实可行的理论指导。
Magnesium chloride wastewater and dolomite produced in the separation process of rare earth smelting were used as raw materials to prepare magnesium hydroxide, and then carbonation was used to prepare high purity magnesium bicarbonate solution to study the behavior and influence of iron impurity ions. The results show that the impurity iron in magnesium bicarbonate solution is introduced by the carbonation reaction of divalent solid iron and exists in the form of ferrous bicarbonate (Fe (HCO3) 2), ie, the carbonization reaction is the core process of iron removal. The Mg (HCO3) 2 solution precipitated rare earth ions after iron removal can significantly reduce the iron impurities in the precipitated product. This article provides practical theoretical guidance for the removal of iron impurity ions in the process of preparing magnesium bicarbonate solution from magnesium chloride waste water and dolomite carbonation.