磷矿脱镁废液制备纳米级氢氧化镁的工艺研究  

Study on process for preparation of nanometer magnesium hydroxide from phosphate rock demagnetization waste liquid

作　　者：周玉新[1] 朱成 王健 侯学娟[1] ZHOU Yuxin;ZHU Cheng;WANG Jian;HOU Xuejuan(School of Chemistry and Pharmacy,Wuhan University of Engineering,Key Laboratory of Green Chemical Process,Ministry of Education,Wuhan Hubei 430073,China)

机构地区：[1]武汉工程大学化工与制药学院绿色化工过程教育部重点实验室,湖北武汉430073

出　　处：《化工矿物与加工》2019年第1期27-30,共4页Industrial Minerals & Processing

摘　　要：以磷矿除镁后的废液与氨水为原料,在撞击流反应器中,采用氨法二步沉淀,探索了回收镁元素的工艺过程,制取了高纯度的氢氧化镁粒子,以聚乙二醇(PEG)6000为分散剂,制备出分散性良好的纳米氢氧化镁粒子。探讨了有关因素对产品中氢氧化镁含量和氧化镁回收率的影响,确定了适宜的工艺条件:除镁废液中氧化镁质量浓度为0.008g/mL,第一次中和反应终点pH值为9.5,第二次中和反应终点pH值的范围为10.20~10.30,第二次中和反应时间为45min,分散剂PEG6000的用量为纳米氢氧化镁理论产量的3%,采用三次沉降方式洗涤产品。制备的纳米氢氧化镁粒子粒径大小在40nm左右,产品中氢氧化镁质量分数为99.27%,氧化镁回收率为83.07%。With the waste liquid and magnesium water after removing magnesium from phosphate rock as raw materials,in the impinging stream reactor,the process of recovering magnesium is explored by two-step precipitation by ammonia method,and high-purity magnesium hydroxide particles are prepared.The nano-magnesium hydroxide particles with good dispersibility are prepared by using polyethylene glycol(PEG)6000 as dispersing agent.The effects of relevant factors on the content of magnesium hydroxide and the recovery rate of magnesium oxide in the product are discussed.The suitable process conditions are determined as follows:the concentration of magnesium oxide in the magnesium waste liquid being 0.008 g/mL,the pH value of the first neutralization reaction end point 9.5,the pH of the second neutralization reaction endpoint ranging from 10.20 to 10.30,the second neutralization reaction time 45 min.and the amount of dispersant PEG6000 3% of the theoretical yield of nanometer magnesium hydroxide.The product is washed by three times sedimentation.The prepared nanometer magnesium hydroxide particles have a particle size of about 40 nm.The magnesium hydroxide content in the product is 99.27%,and the magnesium oxide recovery rate is 83.07%.

关 键 词：除镁废液 氨法 撞击流反应器 纳米氢氧化镁 

分 类 号：X754[环境科学与工程—环境工程]