CAJ | 학술논문

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Acidi-thiobacillus 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45~0μm、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。
사천모고류고신금정광중적금주요이은금광적형식존재,주요재체광물위황철광화독사,금광물이겁미세립포과재류화광물중,상규탄장법청화침금효과겁불이상。위고효、저독침출해정광중적금,이경순화적Acidi-thiobacillus ferrooxidans화Leptospirillum ferrooxidans혼합균군위양화예처리미생물,채용세균양화—무청침금공예연구료침광조건。결과표명,대금품위위46．87 g/t、함신8．56%、함류15．08%적금정광,재시양립도위45~0μm、광장농도위120 g/L、초시pH=2、Fe2+초시농도위1．5 g/L、세균접충량위20%정황하세균양화예처리12 d,재재무청침금신약제용량위4 kg/t적정황하침출4 h,금침출솔가체81．67%,고우상규탄장법청화침금효솔약60개백분점,침금효과량호。
Gold in a high-As and high-S gold concentrate was mainly electrum. Gold is mainly hosted in pyrite and arse-nopyrite. Au-carrier minerals are fine disseminated in sulfide minerals,hitherto regarded as difficult to be extracted with con-ventional 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 45μm,at pH=2,pulp density of 120 g/L,initial [Fe2+] =1. 5 g/L,and inoculum of 20%,bio-oxidation pre-treatment 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.