晶种和絮凝剂对氢氧化镁沉降的影响  

Effect of adding seed crystal and flocculant on magnesium hydrate deposition

作　　者：李艳丽[1] 彭建平[2] 倪平[1] 唐仁刚[1] 

机构地区：[1]海军航空工程学院青岛分院,山东青岛266041 [2]东北大学材料冶金学院

出　　处：《无机盐工业》2008年第11期26-27,43,共3页Inorganic Chemicals Industry

摘　　要：利用水合氯化镁与氨反应生产氢氧化镁,是合理利用海湖镁资源的一项"洁净"工程。但由于氢氧化镁沉淀是一种絮状的胶体,很难过滤分离,给工艺操作、设备的选型提出了很高的要求。为了加快氢氧化镁的沉降,就添加晶种和絮凝剂对氢氧化镁沉降的影响进行了分析研究。试验中,通过测定氢氧化镁沉淀沉降速度、产物过滤所需时间及洗涤后过滤时间来决定添加晶种和絮凝剂的量。结果表明:添加粒度小于45μm、占产物氢氧化镁质量10.0%的晶种量为最佳;絮凝剂的添加量最好控制在1 g氢氧化镁添加0.30 mg聚丙烯酰胺。Using hydrated magnesium chloride and ammonia to produce magnesium hydrate is a ＇ clean＇ project in rational - using lake/sea magnesium resources. But magnesium hydrate precipitate is a flocculent colloid and difficult to be filtered and separated, so the operating process and equipment selection are required highly. In order to speed up the deposition of magnesium hydrate, the effect of adding seed crystal and flocculant has been researched and analyzed. The adding quantity of seed crystal and flocculant was determined by deposition velocity of magnesium hydrate, filtering time of product, and washing time after filtering during the experiment. The results showed that the optimal adding of quantity seed crystal was 10% of magnesium hydrate product with the grain size less than 45 μm. The optimal adding quantity of flocculant is 0.3 mgofPAMto 1 gMg（OH）2.

关 键 词：氢氧化镁 絮凝剂 水合氯化镁 氨 

分 类 号：TQ132.2[化学工程—无机化工]