摘要
为了综合回收钨冶炼除钼渣中的钼、硫、铜,提出碱浸除钼渣分离铜和钼,氧化浸出液中S^(2-)以分离硫和钼的思路,并对比了常压碱浸和高压氧碱浸两种工艺,详细考察碱浸过程氢氧化钠用量、温度、反应时间,液固比等工艺条件对钼浸出率、S^(2-)残留率的影响规律。试验结果表明,常压碱浸在温度85℃、氢氧化钠用量为理论量1.1倍、反应180 min、液固体积质量比3GA6FA1时,钼浸出率为99.48%,铜浸出率低于0.1%,S^(2-)残留率高于98%,选用硫酸与氯酸钠氧化碱浸滤液可实现S^(2-)残留率低于0.2%。高压氧碱浸在温度85℃、氢氧化钠用量为理论量1.1倍、反应180 min、液固体积质量比3GA6FA1时,钼浸出率99.82%,铜浸出率低于0.5%,S^(2-)残留率低至0.35%;两种工艺均可实现钼与铜、硫的深度分离,为除钼渣的综合利用提供切实可行的方案。
In order to comprehensively recover molybdenum,sulfur,and copper from molybdenum removal residues from tungsten smelting,this paper proposes the idea of alkaline leaching molybdenum removal residues to separate copper and molybdenum,and oxidation of S^(2-) in the leaching solution to separate sulfur and molybdenum.This article investigates in detail the influence of sodium hydroxide dosage,temperature,reaction time,liquid-solid ratio and other process conditions on the molybdenum leaching rate and S^(2-) residual rate in the alkaline leaching process.The test results show that when the normal pressure alkaline leaching temperature is 85℃,the sodium hydroxide dosage is 1.1 times the theoretical amount,the reaction is 180 minutes,and the liquid-solid mass ratio is 3GA6FA1,the molybdenum leaching rate is 99.48%,and the copper leaching rate is less than 0.1%The S^(2-) residual rate is higher than 98%.When sulfuric acid and sodium chlorate are used as oxidants to oxidize the alkali leaching filtrate,the S^(2-) residual rate is lower than 0.2%.When high-pressure oxygen alkaline leaching is at a temperature of 85℃,the amount of sodium hydroxide is 1.1 times the theoretical amount,the reaction is 180 minutes,and the mass ratio of liquid to solid is 3GA6FA1,the molybdenum leaching rate is 99.82%,the copper leaching rate is less than 0.5%,and the S^(2-) residual rate As low as 0.35%;both processes can achieve deep separation of molybdenum from copper and sulfur,providing a practical solution for the comprehensive utilization of molybdenum removal sludge.
作者
杨伟
刘锦锐
任倩
YANG Wei;LIU Jinrui;REN Qian(Chengdu Hongbo molybdenum Co., Ltd., Chengdu 610300, Sichuan, China)
出处
《矿产保护与利用》
2021年第4期78-84,共7页
Conservation and Utilization of Mineral Resources
关键词
除钼渣
碱性浸出
低价硫氧化
硫钼分离
copper Molybdenum sludge
alkaline leaching
oxidation of low sulfur
separation of sulfur and molybdenum
