杂质离子的存在会影响氟化镁在后续制备的氟化物玻璃、热压晶体等的应用，需要采取措施降低氟化镁中的杂质离子含量。同时为进一步降低原料成本，实验选用工业级硫酸镁为原料，通过对其进行复合精制、碳酸化、氟化获得了杂质离子含量符合要求的高纯氟化镁。硫酸镁的精制过程采用氧化还原与化学沉淀相结合的方式，用碳酸氢铵将精制的硫酸镁溶液碳酸化为碳酸镁，最后与电子级氢氟酸混合氟化得到高纯氟化镁。实验结果表明，采用此方法制得的氟化镁中铁、锰等杂质离子的质量分数均低于5×10-6，符合高纯氟化镁对杂质离子含量的要求。说明按照此方法制备高纯氟化镁是切实可行的。

The presence of impurity ions affects the application of magnesium fluoride in subsequent fluoride glass，hot?鄄press?鄄 ed crystals and other aspects，and measures should be taken to reduce the impurity ion content.At the same time，in order to further reduce the cost of raw materials，the industrial grade magnesium sulfate was selected as raw material in the experiment， and high?鄄purity magnesium fluoride which meets the requirements by composite refining，carbonation and fluorination was ob?鄄 tained.The refining process used a combination of redox and chemical precipitation，and the refined solution was carbonated to magnesium carbonate with ammonium hydrogencarbonate，then was mixed with electronic grade hydrofluoric acid to obtain high?鄄purity magnesium fluoride.The results showed that the mass fraction of impurity ions such as Fe and Mn in the magne?鄄 sium fluoride prepared by this process was lower than 5×10-6，which meets the requirement of impurity ion content of magnesium fluoride.It is indicated that it is feasible to prepare high?鄄purity magnesium fluoride according to this method.