利用蓄电池废硫酸和硼泥制备高品质氢氧化镁  

Preparation of high-quality magnesium hydroxide with boron slurry and waste sulphuric acid from storage batteries

作　　者：孙博[1] 颜峰[1] 宁桂玲[1] 林源[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116012

出　　处：《无机盐工业》2007年第12期45-47,共3页Inorganic Chemicals Industry

摘　　要：利用废铅酸蓄电池中的废硫酸作为浸取剂,对硼泥中的镁进行回收并制备出高品质的氢氧化镁产品。实验得出了酸浸硼泥的最佳工艺条件：酸浸温度为80℃;酸浸时间为30 min;酸用量为硫酸与硼泥质量比为1.2∶1。利用不同金属水解pH的不同,将酸浸过程中从硼泥和废硫酸中引入的杂质依次去除,得到精制硫酸镁溶液。由精制硫酸镁制取氢氧化镁的工艺条件为：常温下,沉淀剂为氨水,反应终点pH为11,反应时间为2 h,反应物在50℃下陈化12 h,过滤、洗涤后105℃烘干。实验考察了不同沉淀剂对氢氧化镁形貌的影响。所得氢氧化镁纯度在97%以上,粒径在0.1～1μm之间,各项指标均优于中国化工行业标准。Magnesium in the boron slurry has been recovered and synthesized to high-quality magnesium hydroxide with waste sulphuric acid from lead storage batteries as the leaching agent.The optimal process conditions of acid leaching were obtained through experiments,i.e.reaction temperature is 80 ℃;reaction time is 30 min;the mass proportion of acid and boron slurry is 1.2∶1.According to the different hydrolysis pH range of different metals,the impurity ions brought from both boron slurry and waste sulphuric acid during the leaching process could be eliminated one by one and the refined magnesium sulphate solution would be obtained eventually.The process conditions of preparing magnesium hydroxide from refined magnesium sulphate were：under the normal temperature using ammonia as the precipitator;the pH value at reaction end point is 11;reaction time is 2 h;aging the reactants for 12 h at 50 ℃ and then filtering,washing and drying at 105 ℃.The influences of different precipitators on the topography of magnesium hydroxide were investigated during the experiments.The obtained magnesium hydroxide had a purity greater than 97%,size between 0.1～1 μm and all the indexes were better than those in the Chemical Industry Standard of China.

关 键 词：废铅酸蓄电池 废硫酸 硼泥 氢氧化镁 

分 类 号：TQ132.2[化学工程—无机化工]