银锰矿中银的回收新工艺
来源期刊：中国有色金属学报2006年第5期
论文作者：张小云 田学达 刘小玲 张东方
文章页码：914 - 918
关键词：银； 银锰矿; 浮选； 磁选； 还原浸出； 脱泥
Key words：silver; silver-manganese ore; flotation; magnetic separation; reducing leaching; desliming
摘 要：采用“浮选—磁选—还原浸出—重选脱泥”工艺处理银含量为3.15×10-4的某银锰矿。 银的独立矿物用浮选回收； 以类质同象分布于锰矿物中的银用磁选富集； 将浮选精矿和银锰磁选精矿合并， 用焙烧黄铁矿产生的SO2和纤维素还原剂进行还原浸出， 锰溶于液相中， 银在浸出渣中富集； 将浸出渣进行重选脱泥， 可得Ag含量为59.6×10-4的银精矿， Ag的总回收率大于90.68%。
Abstract: The silver in some oxidized silver-manganese ore with a grade of 3.15×10-4 Ag was concentrated with a novel technique including flotation, magnetic separation, reducing leaching and gravity desliming. Around 8.50% silver minerals were separated by flotation, and 91.50% silver contained in manganese ore through isomorphism was concentrated by magnetic separation. The manganese in the concentrate of both flotation and magnetic separation was dissolved in a reducing leaching, in which pyrite and some cellulose reductant were used. A silver concentrate with a grade of 59.6×10-4 and a recovery of 90.68% were obtained by a gravity desliming process.
