白钨矿NaOH-SiO2焙烧-水浸高效提取钨
Efficient extracting of tungsten from scheelite via NaOH-SiO2 roasting followed by water leaching
刘德刚 1廖春发 2刘元鑫 2徐国钻 3周锋 2何秉轩 2梁勇2
作者信息
- 1. School of Metallurgical and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Chongyi Zhangyuan Tungsten Co.,Ltd.,Ganzhou 341000,China
- 2. School of Metallurgical and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China
- 3. Chongyi Zhangyuan Tungsten Co.,Ltd.,Ganzhou 341000,China
- 折叠
摘要
针对NaOH-SiO2焙烧-水浸法从白钨矿中高效提取钨进行了研究.首先,对NaOH-SiO2焙烧分解白钨矿热力学进行了分析,结果表明在该焙烧条件下CaWO4转化成Na2WO4和Na2CaSiO4从热力学角度是可行的;其次,研究了焙烧分解与水浸工艺参数对提取钨的影响,在Na2O与WO3摩尔比为2.2、SiO2:WO3摩尔比为1、焙烧温度为700℃、焙烧时间2 h的条件下,通过控制液固比为3.2:1、水浸温度为80℃、浸出4 h后,钨的浸出率达到99.33%,浸出渣含钨为0.71%.进一步的物相分析表明,在NaOH-SiO2焙烧过程中,白钨矿中的CaWO4高效转化成Na2CaSiO4和Na2WO4.本研究结果为白钨矿采用火法高效提取钨提供了新路径.
Abstract
Efficient extraction of scheelite using a NaOH-SiO2 roasting and water leaching system was assessed.Initially,the NaOH-SiO2 roasting process was thermodynamically analyzed using ∆GΘ-T diagrams of the possible reactions,which indicated that the CaWO4 transforming to Na2WO4 and Na2CaSiO4 under roasting conditions was feasible.Subsequently,the effect of the thermal decomposition and leaching parameters was investigated.The results showed that the optimal extraction conditions were achieved with a Na2O-to-WO3 molar ratio of 2.2,a SiO2-to-WO3 molar ratio of 1.0,a roasting temperature of 700℃,a roasting time of 2 h,a leaching temperature of 80℃,a liquid-to-solid ratio of 3.2:1 and a leaching time of 4 h.Under those conditions,the leaching rate of tungsten was 99.33%and WO3 mass content in residue was 0.71%.Further mineralogical analysis showed that the CaWO4 of scheelite was effectively transformed to Na2CaSiO4 and Na2WO4 under NaOH-SiO2 roasting process.Broadly,the results of this paper provided a reference for the efficient extraction of scheelite using a pyrometallurgy process.
关键词
白钨矿/NaOH/焙烧/物相转化/浸出Key words
scheelite/sodium hydroxide/roasting/mineral transformation/leaching引用本文复制引用
基金项目
National Key R&D Program of China(2019YFC1907404)
Key Project of Natural Science Foundation of Jiangxi Province,China(20202ACBL204002)
Jiangxi Province Education Department of Science and Technology,Chinat(GJJ200813)
Program of Scientific Research Foundation of Jiangxi University of Science and Technology,China(205200100509)
Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology,China(JXUSTQJBJ2017004)
出版年
2023
NETL
NSTL
万方数据