四川某含砷难处理金精矿细菌氧化—无氰提金试验

金属矿山 ›› 2015, Vol. 44 ›› Issue (01): 67-71.

四川某含砷难处理金精矿细菌氧化—无氰提金试验

傅开彬^1,2，董发勤^1,2，谌书^1,2，王新峰^1,2

1.固体废弃物处理与资源化教育部重点实验室，四川绵阳 621010；2.西南科技大学环境与资源学院，四川绵阳 621010

出版日期:2015-01-15 发布日期:2015-07-28
基金资助:
* 西南科技大学科研基金项目（编号：12zx7113）。

Biooxidation-Cyanide-free Gold Leaching of a Refractory Gold Ore Containing Arsenic in Sichuan Province

Fu Kaibin^1,2，Dong Faqing^1,2，Chen Shu^1,2，Wang Xinfeng^1,2

1.Key Laboratory of Solid Waste Treatment and Resource Recycle，Ministry of Education，Mianyang 621010，China；2.School of Environment and Resource，Southwest University of Science and Technology，Mianyang 621010，China

Online:2015-01-15 Published:2015-07-28

摘要/Abstract

摘要： 四川某高硫高砷金精矿中的金主要以银金矿的形式存在，主要载体矿物为黄铁矿和毒砂，金矿物以极微细粒包裹在硫化矿物中，常规碳浆法氰化浸金效果极不理想。为高效、低毒浸出该精矿中的金，以经驯化的Acidithiobacillus ferrooxidans和Leptospirillum ferrooxidans混合菌群为氧化预处理微生物，采用细菌氧化—无氰浸金工艺研究了浸矿条件。结果表明，对金品位为46.87 g/t、含砷8.56%、含硫15.08%的金精矿，在试样粒度为45～0 μm、矿浆浓度为120 g/L、初始pH=2、Fe²⁺初始浓度为1.5 g/L、细菌接种量为20%情况下细菌氧化预处理12 d，再在无氰浸金新药剂用量为4 kg/t的情况下浸出4 h，金浸出率可达81.67%，高于常规碳浆法氰化浸金效率约60个百分点，浸金效果良好。

关键词: 含砷难处理金矿, 细菌氧化, 无氰浸金

Abstract: Gold in a high-As and high-S gold concentrate was mainly electrum.Gold is mainly hosted in pyrite and arsenopyrite.Au-carrier minerals are fine disseminated in sulfide minerals，hitherto regarded as difficult to be extracted with conventional CIP（Carbon in Pulp) process.Biooxidation pretreatment and cyanide-free gold leaching were investigated to extract gold by a high-effective and low toxicity method.The mixture of Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans was used as oxidation pretreatment microorganism.For gold concentrate（46.87 g/t Au，8.56% As，15.08% S) with particle size of less than 45 μm，at pH=2，pulp density of 120 g/L，initial ［Fe²⁺］=1.5 g/L，and inoculum of 20%，bio-oxidation pretreatment for 12 d，and novel cyanide-free reagent dosage of 4 kg/t leaching for 4 h，the extraction rate of gold can reach 81.67%，higher than CIP of 60 percentage points.The gold leaching index is good.

Key words: Arsenic bearing refractory gold ore, Biooxidation, Cyanide-free gold leaching

傅开彬, 董发勤, 谌书, 王新峰. 四川某含砷难处理金精矿细菌氧化—无氰提金试验[J]. 金属矿山, 2015, 44(01): 67-71.

FU Kai-Bin, DONG Fa-Qin, CHEN Shu, WANG Xin-Feng. Biooxidation-Cyanide-free Gold Leaching of a Refractory Gold Ore Containing Arsenic in Sichuan Province[J]. Metal Mine, 2015, 44(01): 67-71.

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