镍钼矿中钼、硫清洁回收工艺  

Clean recovering process of molybdenum and sulfur from nickel-molybdenum ores

作　　者：唐施阳 杨建广 南天翔 龙伟 TANG Shi-yang;YANG Jian-guang;NAN Tian-xiang;LONG Wei(School of Metallurgy and Environmental,Central South University,Changsha 410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《中国有色金属学报》2022年第4期1078-1087,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发专项课题资助项目(2018YFC1900403);国家自然科学基金资助项目(52074362);中南大学中央高校基本科研业务费专项资金资助项目(2020zzts479)。

摘　　要：针对贵州地区复杂镍钼矿难以清洁高效利用的问题,提出了碱性焙烧−净化−冷冻结晶−离子交换回收钼及副产物Na_(2)SO_(4)的清洁冶金工艺。采用单因素实验法,考察了碱性焙烧−浸出过程中Na_(2)CO_(3)用量、焙烧温度、焙烧时间、浸出温度和浸出时间等因素对钼浸出率和浸出液成分的影响,研究了冷冻结晶过程溶液中钼、硫含量对Na_(2)SO_(4)结晶率及产品纯度的影响。结果表明:在Na_(2)CO_(3)用量为理论用量的1.2倍、焙烧温度800℃、焙烧时间1 h、浸出温度95℃、浸出时间1 h的优化条件下,钼的总浸出率为94.68%。经四次循环后,浸出液中钼浓度约为40 g/L、硫浓度约为90 g/L。对循环浸出液冷冻结晶,可得到结晶率为89.61%的Na_(2)SO_(4)。结晶母液经离子交换得到的高峰解析液中钼浓度可达115 g/L以上。The Ni-Mo ore is a kind of refractory ore,which has been neglected for several decades,due to the absence of an efficient treatment process.In this paper,a metallurgy process including alkaline roasting,purification,freezing crystallization,and ion exchange for extraction of molybdenum and Na_(2)SO_(4)from Ni-Mo ore has been proposed.The effects of Na_(2)CO_(3)dosage,roasting temperature,roasting duration,leaching temperature and leaching duration on the leaching efficiency of molybdenum and the composition of the leachate were investigated by single-factor experiment.In addition,the effects of the concentration of molybdenum and sulfur in the leachate on the crystallization efficiency and purity of Na_(2)SO_(4)were studied.The result shows the leaching efficiency of molybdenum is 94.68%with the optimal conditions in roasting-leaching process of the dosage of Na_(2)CO_(3)is 1.2 times of the theoretical amount,the roasting temperature of 800℃,the roasting duration of 1 h,and the leaching temperature of 95℃.The purity of Na_(2)SO_(4)produced by freezing crystallization process is 97.45%with the optimum condition of the concentration of molybdenum about 40 g/L and sulfur about 90 g/L.The concentration of molybdenum in stripping aqueous is 115 g/L,which is obtained by ion exchange.

关 键 词：镍钼矿 清洁冶金 冷冻结晶 Na_(2)SO_(4)回收 钼回收 

分 类 号：TF84[冶金工程—有色金属冶金] TQ115[化学工程—无机化工]