水氯镁石制备硅钢级氧化镁  

Preparation of Magnesium Oxide with Silico-steel Grade from Bischofite

作　　者：徐徽[1] 程俊峰[1] 李贵[1] 杨喜云[1] 刘卫平[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《材料导报》2013年第16期104-107,共4页Materials Reports

基　　金：中央专项中南大学前沿研究计划重点项目(2010QZZD003)

摘　　要：以水氯镁石为原料,采用氨法沉镁-煅烧-添加剂的方法制备硅钢级氧化镁。考察了反应温度、反应pH值、陈化时间对中间体氢氧化镁纯度及转化率的影响;研究了煅烧温度和煅烧时间对氧化镁水化率的影响及添加剂的量对氧化镁悬浮性能的影响。控制实验条件为:反应温度55℃,pH值为9.5,陈化时间2h,煅烧温度1050℃,煅烧时间2h,添加剂量为0.8%,制得氧化镁的纯度为98.99%、水化率为2.92%、悬浮性能为3mm/h,达到硅钢级氧化镁的要求。Using bischofite as raw material, the preparation of magnesium oxide with silieo-steel grade was studied. The effects of reaction temperature, reaction pH value and aging time on the intermediate magnesium hydro- xide purity and conversion rate were studied. Calcinations temperature, calcinations time relationship to the hydration rate of MgO and amount of additive to the suspension performance of MgO were investigated. The results indicated that the optimum technological conditions were as follows： reaction temperature is 55 ℃, reaction pH value is 9.5, aging time is 2 h, the calcinations temperature is 1050 ℃ and the calcinations time is 2 h. The amount of additive is 0. 8%. The results show that the purity of magnesium oxide sion performance is 3 mm/h which meet the requirements of Key words magnesium oxide with silico-steel grade, is 98. 99%, the hydration rate is 2. 92% and the suspen- magnesium oxide with sillieo-steel grade.

关 键 词：硅钢级氧化镁 氢氧化镁 水氯镁石 氨水 

分 类 号：TQ132.2[化学工程—无机化工]