PDF《难处理含金硫精矿的焙烧氧化−硫代硫酸盐浸出》

第?24?卷第?3?期 中国有色金属学报? 2014?年?3?月? Volume?24?Number?3? The?Chinese?Journal?of?Nonferrous?Metals? March 2014? 文章编号:1004?0609(2014)03?0831?07? 难处理含金硫精矿的焙烧氧化?硫代硫酸盐浸出 李峰?1, 2? ,丁德馨?1,?2? ,胡南?1? ,彭志成?1, 2? ,陈伟?1,?2? (1.

? 南华大学 铀矿冶生物技术国防重点学科实验室,衡阳? 421001;

? 2.? 南华大学 核资源工程学院,衡阳? 421001)? 摘要:为了提高难处理含金硫精矿中金的浸出率,采用同步热分析仪研究在马弗炉中焙烧氧化难处理含金硫精 矿的最佳条件,通过优化实验确定硫代硫酸盐浸出的最佳工艺参数.结果表明:在马弗炉中焙烧氧化难处理含金 硫精矿最佳条件为在

700 ℃温度下焙烧 2?h,难处理含金硫精矿硫的去除率可达 94.7%.焙烧后,金的浸出率大幅 度提高.使用组成为 0.03?mol/L?CuSO

4、1.0?mol/L?NH3?H2O、0.3?mol/L?Na2S2O

3、0.1?mol/L?(NH4)2SO4?和0.3?mol/L? Na2SO3?的硫代硫酸盐溶液作为浸出剂,最佳浸出工艺参数如下:浸出时间 18?h、液固比 2:

1、振荡速度 250?r/min、 浸出温度

50 ℃.在此浸出工艺参数下,金浸出率达 71.2%. 关键词:难处理含金硫精矿;

金;

硫代硫酸盐;

浸出;

焙烧;

氧化 中图分类号:TF803.21? 文献标志码:A? Roasting?oxidation?thiosulfate leaching?of?gold from? refractory?gold?bearing?sulfur concentrates? LI?Feng? 1,?2? ,?DING?De?xin? 1, 2? ,?HU?Nan? 1? ,?PENG?Zhi?cheng? 1,?2? ,?CHEN?Wei? 1, 2? (1.?Key?Discipline?Laboratory?for?National?Defence?for?Biotechnology?in?Uranium?Mining?and?Hydrometallurgy,? University?of?South?China,?Hengyang?421001,?China?? 2.?School?of?Nuclear?Resource?Engineering,?University?of?South?China,?Hengyang?421001,?China)? Abstract:?In?order?to?increase?the?leaching?rate?of?gold?from?refractory?gold?bearing?sulfur?concentrates?the?synchronous? thermal? analyzer? was? adopted? to? study? the? best? condition? of? roasting? and? oxidizing? refractory? gold?bearing? sulfur? concentrates?in?the?muffle,?and?the?optimum?technological?parameters?of?thiosulfate?leaching?were?ascertained?through? optimal?experiment.?The?results?show?that?the?best?conditions?of?roasting?and?oxidizing?refractory?gold?bearing?sulfur? concentrates?are?as?follows: roasting?in?the?muffle?at?700?℃?for?2?h?with?94.7%?removal?rate?of?sulfur.?After?the?roasting? and? oxidizing,?the? gold? leaching? rate? increases? substantially.? The? leaching?rate?of?gold? reaches?71.2%?at?the? optimal? leaching?technological?parameters? of?the?leaching?time?18?h,?ratio?of?liquid?to?solid?2:1,?oscillating?speed?250?r/min,? leaching?temperature?50?℃?when?leaching?lixiviation?is?composed?of?0.03?mol/L?CuSO4,?1.0?mol/L?NH3?H2O,?0.3?mol/L? Na2S2O3,?0.1?mol/L?(NH4)2SO4?and?0.3?mol/L?Na2SO3.? Key?words: refractory?gold?bearing?sulfur?concentrates? gold? thiosulfate? leaching? roasting? oxidation? 金作为重要的国际储备资产,同时也是特殊的战 略资源, 具有极优的稳定性与良好的导电性和导热性, 在工业和现代高新技术产业中得到了广泛应用? [1?4]? . 我 国金矿资源丰富,但在已探明的金矿资源中,近? 1/4? 的属于难浸金矿.随着易浸金矿的日益减少,人们越 来越关注难浸金矿的研究? [5?8]? . 难浸金矿中金的浸出率 低是因其被其他成分包裹,使其不能与浸出剂接触反 应.为了提高金的浸出率,需对矿石进行预处理,使 基金项目:湖南省自然科学省市联合基金资助项目(12JJ8008)? 收稿日期:2013?06?24;