轻烧粉蒸氨液中杂离子对氢氧化镁晶体的影响

以轻烧粉精制液和氨气为原料，研究了蒸氨精制液中杂质离子对氢氧化镁形貌的影响。选取阳离子NH4+、Ca2+和阴离子SO42-作为研究对象，考察了其对氢氧化镁的形貌和颗粒大小的影响。采用扫描电镜（SEM）、X射线衍射仪（XRD）和激光粒度仪对产品进行表征。结果表明，NH4+、Ca2+对氢氧化镁产品的性能影响较小，而SO42-对氢氧化镁产品的形貌和粒径影响较显著。并利用氯化钡除去溶液中的SO42-，比较未除硫、除硫后与用纯氯化镁制备的产品的差别。

Influence of impurity ions on magnesium hydroxide product in ammonia-evaporation refined solution

With the light burning powder refined liquid and ammonia as raw materials，the influence of impurity ions in steamed ammonia refining fluid on the magnesium hydroxide morphology was investigated.Cationic NH⁴⁺，Ca²⁺，and anion SO₄^2- were selected as the research objects to investigate their influences on the morphology and particle size of magnesium hydroxide.The products were characterized by scanning electron microscopy（SEM），X-ray diffraction（XRD），and laser par- ticle size analyzer.Results showed that NH⁴⁺ and Ca²⁺ little influenced on the performance of magnesium hydroxide product， and the SO₄^2-  had a great influence on the morphology and particle size of magnesium hydroxide product.BaCl₂ was used to remove SO₄^2- in the solution.The difference of the undesulphurized and desulphurized products was also compared with the product prepared with pure magnesium chloride.