从锰银矿中一步法浸出锰和银的热力学基础与应用  

Fundamentals and applications of simultaneous leaching of manganese and silver from manganese-silver associated ore

作　　者：张斌[1] 姜涛[2] 杨永斌[2] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]中南大学资源加工与生物工程学院,长沙410083

出　　处：《中国有色金属学报》2007年第11期1887-1892,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(59604002)

摘　　要：研究在酸性介质中从锰银矿中同时浸出锰和银的热力学基础与技术条件。Mn-H2O系和Ag-H2O系电位(φ)—pH图研究结果表明:Mn2+和Ag+可以有一个稳定共存的区域,热力学条件为:25℃和101.325 kPa下,[Mn]=1 mol/L,[Ag]=10-3 mol/L,pH<3.63,0.621 7<φ<(1.229-0.118 2pH)和3.63<pH<4.635,0.621 7<φ<(1.443 4-0.177 3pH)。过氧化氢的加入在一步法浸出过程中起着关键作用,在还原二氧化锰的同时还能同时使银氧化。加入高锰酸钾的作用是使矿石中未被二氧化锰包裹的银被氧化。室温下,浸出时间为2 h,高锰酸钾浓度为2 g/L,过氧化氢浓度为0.8 mol/L,硫酸浓度为0.9 mol/L,获得锰的浸出率为95.62%,银的浸出率为83.28%。Thermodynamics and technologies of simultaneous leaching of manganese and silver from manganese-silver associated ore in the sulfuric solution were investigated. Thermodynamics investigations of Mn-H2O system and Ag-H2O system show that there is a predominance area in potential （φ）-pH diagram, where Mn^2＋ and Ag^＋ coexist in solution. The conditions are： 25 ℃ and 101.325 kPa, [Mn]=1 mol/L, [Ag]=10^-3 mol/L, pH〈3.63, 0.621 7〈 φ 〈（1.229- 0.118 2pH） and 3.63〈pH〈4.635, 0.621 7〈 φ 〈（1.443 4-0.177 3pH）. The added hydrogen peroxide is critical to the simultaneous leaching, plays part of both the reducing agent of manganese dioxide and the oxidizing agent of native silver. The added potassium permanganate is for oxidizing the silver that is unwrapped by manganese dioxide in the ore. A recovery of 95.62% for Mn and 83.28% for Ag is attained at room temperature under the leaching conditions of 2 h leaching time, 2 g/L KMnO4, 0.8 mol/L H2O2 and 0.9 mol/L H2SO4.

关 键 词：锰银矿 一步法浸出 电位(φ)—pH图 过氧化氢 

分 类 号：TF843[冶金工程—有色金属冶金]