溶胶-凝胶法由菱镁矿制备纳米氧化镁

Preparation of nanometer MgO by sol-gel method from magnesite

采用溶胶-凝胶法,以菱镁矿、盐酸和尿素为原料,加入成胶剂聚乙二醇制备纳米氧化镁。考察了煅烧温度、成胶剂分子量、分散剂及其用量对实验的影响。结果表明,制备纳米氧化镁的适宜条件为:以10 000分子量聚乙二醇为成胶剂,1.5%的PVT-1为分散剂,煅烧温度为650℃。在此条件下,可获得纯度98.5%,平均粒径小于100 nm,呈近球形均匀分布,活性良好的纳米氧化镁。

Nanometer magnesia was prepared from magnesite,hydrochloric acid and urea by sol-gel method,polyethylene was added as gelatinizing agent.Effect of calcining temperature,gelling agent molecular weight,dispersant and its dosage was examined.Results showed that optimal conditions of preparation were as follows：polyethylene glycol with molecular 10 000,mass fraction of PVT-1 as dispersant was 1.5% and calcining temperature was 650 ℃.Under the optimum conditions：the purity was 98.5%,average particle size was less than 100 nm,exhibited uniform spherical distribution and good activity.