改善氢氧化镁过滤性能的实验研究

以六水氯化镁为原料，氢氧化钠为沉淀剂，采用沉淀法制备氢氧化镁阻燃剂，为解决所得氢氧化镁浆料难过滤的问题，提出在制备过程中添加表面活性剂，考察了加料方式、表面活性剂种类、表面活性剂添加量等因素对氢氧化镁浆料过滤性能的影响；对制备的产品进行化学组成分析并通过透射电子显微镜表征形貌和粒径大小。结果表明：采用双滴加的加料方式，乙氧基化烷基硫酸钠（AES）为表面活性剂，AES添加量为4%（质量分数）的反应条件，可以显著提高氢氧化镁浆料的过滤性能，并且制得质量符合HG/T 3607-2007《工业氢氯化镁》Ⅰ类标准要求的氢氧化镁产品；透射电子显微镜结果表明得到的产品形貌为六方片状，平均粒径为50 nm，无团聚现象。

Study on improvement of magnesium hydroxide filtration performance

Flame retardant magnesium hydroxide was prepared by precipitation method with MgCl2·6H2O as raw material and NaOH as precipitant.To solve the filtration difficulty of the magnesium hydroxide slurry，it proposed to add surfactants in the preparation process. The effects of feeding mode，surfactant types，and dosage on the filtration performance of magnesium hydroxide slurry were investigated.The chemical composition of product was analyzed by chemical analysis method.The morphology was characterized by transmission electron microscopy.Results showed that the filtration performance of the magnesium hydroxide slurry was significantly increased when double dropping mode was used，sodium alcohol ether sulphate（AES）was as the surfactant and its dosage was 4%（mass fraction），and the quality of magnesium hydroxide meet the standard requirement of Magnesium Hydroxide for Industrial Use（HG/T 3607-2007， class Ⅰ）.Transmission electron microscopy results showed that the product had hexagonal flake morphology with an average particle size of 50 nm，and no agglomeration.