利用电石渣和氯化镁制氢氧化镁工艺研究

采用电石渣和盐湖氯化镁为原料制取氢氧化镁。电石渣（氢氧化钙）与氯化铵反应生成氨气，将氨气通入氯化镁溶液中制备氢氧化镁。通过单因素实验和正交实验得出最佳工艺条件：氯化铵与氯化镁物质的量比为5.0，氯化镁浓度为2.0 mol/L，反应时间为60 min，反应温度为25 ℃，陈化时间为2 h。在该条件下氢氧化镁的生成率可达到89%，纯度也可达到98%以上。通过X射线衍射（XRD）及扫描电镜（SEM）表征表明，氢氧化镁产品为片状，粒径在800 nm左右。采用该方法制备氢氧化镁，不仅可以解决电石渣和盐湖氯化镁的大量堆放问题，而且可以制备出高品质的氢氧化镁产品。

Study on preparation magnesium hydroxide by using carbide slag and magnesium chloride

Magnesium hydroxide was obtained by using carbide slag and magnesium chloride as raw materials.Through reaction of carbide slag(calcium hydroxide)and ammonium chloride to prepare ammonia air,then put ammonia air into magnesium chloride solution to get magnesium hydroxide.Through single factor experiments,the optimum technology conditions were obtained:amount-of-substance ratio of ammonium chloride to magnesium chloride was 5.0,concentration of magnesium chloride was 2.0 mol/L,reaction time was 60 min,reacti...