DOC《硫磺还原焙烧—酸浸法提取锰阳极泥》

硫磺还原焙烧―酸浸法提取锰阳极泥 黎应芬1,李祥1,叶华2,孔祥忠2 (1.

贵州理工学院 材料与冶金工程学院,贵阳 550003;

2.中南大学 化学与化工学院,长沙 410083) 摘要:以硫磺为还原剂,硫酸溶液为浸出剂,通过火法―湿法耦合的方法提取电解锰阳极泥中的锰和尾渣富集铅.对硫磺用量、焙烧温度、焙烧时间、浸出温度、硫酸用量等工艺参数进行了探究.结果表明,当硫磺和锰阳极泥的质量比为1.

0、焙烧温度300 ℃、焙烧时间60 min、硫酸和锰的摩尔比0.

9、浸出温度25 ℃、浸出反应20 min时,锰的浸出率为98 %,尾渣含铅量30.5%. 关键词:锰阳极泥;

硫磺;

硫酸;

焙烧 中图分类号:TF803.2 文献标志码:A 文章编号:1007-7545(2017)08-0000-00 Recovery of Manganese Anode Slimes by Sulfur Reduction Roasting-Acid Leaching Process LI Ying-fen1, LI Xiang1, YE Hua2, KONG Xiang-zhong2 (1. College of Materials and Metallurgy Engineering, Guizhou Institute of Technology, Guiyang 550003, China;

2. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China) Abstract:Manganese and lead were recovered from manganese anode slimes via reduction roasting-acid leaching process with sulfur as reductant and H2SO4 as leaching agent. The effects of sulfur dosage, roasting temperature, roasting time, leaching time, and H2SO4 dosage on manganese extraction and lead enrichment were investigated. The results show that manganese extraction rate is 98% and lead content in slag is 30.5% under the optimum conditions including mass rate of sulfur to manganese anode slimes of 1.0, roasting temperature of

300 ℃, roasting time of

60 min, molar rate of H2SO4 to manganese of 0.9, leaching temperature of

25 ℃, and leaching time of

20 min. Key words:manganese anode slime;

sulfur;

sulfuric acid;

roast 锰在钢铁,化工和电池行业有广泛的用途,近年来,锂电池和超级电容器在电子产品和电动汽车领域得到普遍应用,更是加大了锰的需求量[1],所以单纯依靠锰矿资源的开发已经难以满足市场需求.电解锰阳极泥主要成分是MnO

2、PbSO4等,作为生产电解锰过程中的副产品,其中含锰量往往高于40%,有必要对其进行综合回收[2-3]. 目前,从锰矿和阳极泥中提取锰的方法主要有:一是利用SO

2、HCl、CH3OH等在酸性条件下还原MnO2,锰以Mn2+形式溶解出来,适合处理低品位原料.二是在高温下把四价锰还原为单质锰,常见还原剂有C、CO、H2等,适合处理高品位原料.三是火法与湿法相结合的联合工艺,原料先经硫酸化焙烧、还原焙烧或氯化焙烧,然后再进行浸出,锰溶解到溶液中[4-5],常用浸出剂是H2O、H2SO

4、HCl或HNO3.ZHANG等[6]以硫磺为还原剂把低品位锰矿焙烧还原,然后用硫酸溶液浸出.周艳红等[7]则以蔗髓为还原剂,在350 ℃对软锰矿进行还原焙烧,再把产物溶于硫酸溶液中,提取效果都比较理想.而CHENG等[8]利用稻秆为还原剂,在500 ℃焙烧还原低品位的锰矿,然后进行硫酸溶液浸出,也同样具有很高的浸出率.王婷香[9]将粗糠水解后与软锰矿粉进行反应,再用硫酸浸出,锰的浸出率达95%以上.本文研究硫磺还原焙烧―硫酸浸出法提取锰阳极泥的工艺,考察了焙烧和浸出条件对锰浸出率以及尾渣富集铅的影响.

1 试验 1.1 试验材料 本试验所用锰阳极泥取自湖南湘西某冶炼厂,原料按照试验要求进行了烘干、球磨、筛分.采用XRF分析其成分,结果为(%):Mg 0.