新法铝热炼镁还原渣提取高白氢氧化铝  

Extract of high-whiteness aluminum hydroxide from residues of novel process of magnesium production by aluminothermic reduction

作　　者：狄跃忠[1] 王智慧[1] 王耀武[1] 彭建平[1] 冯乃祥[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《化工学报》2013年第3期1106-1111,共6页CIESC Journal

基　　金：辽宁省镁质材料行业高新技术研发项目(MYF2011-34);辽宁省工业攻关项目(2011221002)~~

摘　　要：新法铝热炼镁工艺以白云石和菱镁石为原料、以铝粉为还原剂,在真空还原获得金属镁的同时得到富含CaO.2Al2O3的还原渣,该还原渣可通过氢氧化钠和碳酸钠的混合碱液溶出得到铝酸钠溶液,并通过碳酸化分解制备氢氧化铝。以该工艺所得还原渣为原料,系统地研究各溶出条件对氧化铝溶出率的影响,并对碳分所得氢氧化铝进行性能检测。结果表明,在氢氧化钠浓度80g.L-1、碳碱浓度110g.L-1、溶出时间120min、溶出温度95℃、液固比为6的条件下,炼镁还原渣中氧化铝的溶出率在85%以上。氢氧化铝产品白度均大于98,平均粒径为26.98μm,能够达到高白氢氧化铝的要求。The novel process producing magnesium metal using vacuum aluminothermic reduction, which utilizes dolomite and magnesite as raw materials and aluminum powder as reductant, produces reducing slag containing-rich CaO · 2A1203. The reducing residue can be solved by a mixture solution of sodium hydroxide and sodium carbonate, and a solution of sodium aluminate is produced which can be decomposed by CO2 to obtain aluminum hydroxide. For the production process of aluminum hydroxide, effects of process parameters on leaching rate of alumina are investigated systematically and the performance of aluminum hydroxide obtained was detected. The results show that the alumina leaching rate from the residue is above 850//00 under the conditions of NaOH concentration 80 g · L 1, Na2CO3 concentration 110 g · L-1 , leaching temperature 95℃, leaching time 120min and L/S 6. Whiteness of aluminum hydroxide obtained carbonation precipitation at 50℃ is over 98, and average particle size is 26.98μm.

关 键 词：镁 还原渣 溶出 碳分 高白氢氧化铝 

分 类 号：TF111.3[冶金工程—冶金物理化学]