菱镁矿尾矿酸浸动力学研究
Series No．497November一2017一一一一一一一一一一一一一一金一一属一一矿一一山METAL MINE 一一一一一一一一一一一一一一总第497期2017年第11期收稿日期一2017-08-14基金项目一水体污染与治理科技重大专项项目(编号:2015ZX07205-003),中国大洋矿产资源研究计划项目(编号:DY125-15-T -08),国家自然
科学基金项目(编号:21176026,21176242)三
作者简介一滕一青(1990 ),女,博士研究生三通讯作者一冯雅丽(1967 ),女,教授,博导三
四综合利用四
菱镁矿尾矿酸浸动力学研究
滕一青1一冯雅丽1一马一英2
(1.北京科技大学土木与资源工程学院,北京100083;2.辽宁省海城市环境保护监测站,辽宁海城114200)
摘一要一为了优化菱镁矿尾矿酸浸提镁工艺,提高酸浸效率,对某菱镁矿尾矿中的镁进行了酸浸行为研究,考察
了不同反应因素对菱镁矿尾矿中镁浸出率的影响,从动力学角度分析了菱镁矿尾矿中镁的浸出行为三研究结果表明:提高菱镁矿尾矿的细度二硫酸的浓度和浸出温度均有利于镁浸出率的提高,液固比变化对镁浸出率的影响不大三当试样的粒度为0.074~0mm,硫酸的浓度为1.5mol /L,浸出液固比为3mL /g,浸出温度为80?,浸出时间为2h 时,镁浸出率可达84%三镁的硫酸浸出过程符合液-固相非催化反应的缩芯模型,浸出过程受扩散和化学反应共同控制,浸出反应的表观活化能为21.02kJ /mol三
关键词一菱镁矿尾矿一浸出一动力学一一中图分类号一TF841.3一一一文献标志码一A一一一文章编号一1001-1250(2017)-11-189-05Acid Leaching Kinetics of Magnesite Tailings
Teng Qing 1一Feng Yali 1一Ma Ying 2
(1.School of Civil and Environment Engineering ,University of Science and Technology Beijing ,Beijing 100083,China ;2.Environmental Protection Monitoring Station of Haicheng City ,Liaoning Province ,Haicheng 114200,China )Abstract 一In order to optimize the process of acid leaching and magnesium extraction,improve the acid leaching efficien-cy of magnesite tailings,acid leaching behavior of magnesium for magnesite tailings is carried out to investigate the effects of different reaction factors on magnesium leaching rate of magnesite tailings.The leaching behavior of magnesium is analyzed from the perspective of dynamics.The results show that increasing the fineness of magnesite tailings,the concentration of sulfu-ric acid and the leaching temperature are beneficial to the increase of leaching rate of magnesium,and the variation of liquid solid ratio has little effect on the leaching rate of magnesium.When the particle size of the sample is 0.074~0mm,the con-centration of sulfuric acid is 1.5mol /L,the leaching liquid solid ratio is 3mL /g,the leaching temperature is 80?for 2h,the leaching rate of magnesium can reach 84%.The sulfuric acid leaching process of magnesium accords with the shrinking core model of liquid solid non catalytic reaction.The leaching process is controlled jointly by diffusion and chemical reaction,with
the apparent activation energy of 21.02kJ /mol.Keywords 一Magnesite tailings,Leaching,Kinetic
一一菱镁矿是我国重要的出口矿种之一,随着镁矿资源开采力度的加大,优质菱镁矿资源不断减少,菱镁
矿浮选尾矿不断堆积,研究其再回收利用具有重要意
义[1]三关于菱镁矿的结构和溶解性等,国外进行了系统的研究:G.Nermin [2]的研究表明,在有有机活性
剂的情况下,菱镁矿存在接触角三D.Economou 等[3]
给出了菱镁矿与有机酸的直接反应机理,表明传质对
反应速率有决定性的作用三D.Bünyamin [4]考察了菱
镁矿在醋酸中的溶解情况,得出自然菱镁矿在醋酸溶
液中主要受化学反应影响三B.Feray 等[5]进一步探索了乳酸镁的溶解方法,得出乳酸镁溶出受化学反应控制三P.Raschman 等[6]采用柠檬酸浸出菱镁矿,在最优工艺条件下得到了99.90%的超纯菱镁矿三近年来,国内关于菱镁矿的研究也逐步展开,主要是针对菱镁矿原矿的选矿[7-10]以及菱镁矿的热解[11-12]和碳化[13]制备氧化镁等方面,对菱镁矿尾矿再利用的研究则鲜见报道三通过对某菱镁矿尾矿的酸浸试验,研究镁的浸出
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