(湘潭大學(xué) 化工學(xué)院， 湘潭 411105)
摘 要: 采用“浮選—磁選—還原浸出—重選脫泥”工藝處理銀含量為3.15×10-4的某銀錳礦。 銀的獨立礦物用浮選回收； 以類質(zhì)同象分布于錳礦物中的銀用磁選富集； 將浮選精礦和銀錳磁選精礦合并， 用焙燒黃鐵礦產(chǎn)生的SO2和纖維素還原劑進(jìn)行還原浸出， 錳溶于液相中， 銀在浸出渣中富集； 將浸出渣進(jìn)行重選脫泥， 可得Ag含量為59.6×10-4的銀精礦， Ag的總回收率大于90.68%。
關(guān)鍵字: 銀； 銀錳礦; 浮選； 磁選； 還原浸出； 脫泥
（ Chemical Engineering College, Xiangtan University, Xiangtan 411105, China）
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.
Key words: silver; silver-manganese ore; flotation; magnetic separation; reducing leaching; desliming
