摘要
贵州某金矿含金3.05 g.t-1、砷0.25%、硫5.95%、碳质1.44%,金粒度极小(多数小于2μm),采用浮选工艺获得的金精矿金品位低,硫砷难以分离,金精矿直接氰化浸出金浸出率只有10.21%,为典型的难选冶金矿石。针对浮选金精矿的特点,开展了高效浸矿菌的选育、生物预氧化-氰化浸出实验研究。实验结果表明,采自泥堡金矿(NB)、紫金山铜矿(ZJ)、白山镍钴铜矿(BS)、墨江镍钴矿(MJ)、德兴铜矿(DX)等五个矿山的浸矿菌群中NB菌生长繁殖最好,故选定NB菌群作为实验用菌种,经过进一步的连续转接、逐级驯化后,用于生物预氧化,氧化周期15 d,硫的氧化率达到49.31%,金的氰化浸出率达到80.18%。采用构建16SrDNA克隆文库的方法对预氧化体系中的微生物组成进行了初步研究,结果表明,预氧化体系中NB菌群既包含细菌也包括古菌,细菌主要由Sulfobacillus sp.(52%),Sulfobacillus thermotoler-ans(25%),Leptospirillum ferriphilum(23%)组成,而古菌为Ferroplasma acidiphilum。
A gold mine of Guizhou contained gold 3.05 g·t^-1, arsenic 0.25%, sulfur 5.95%, 1.44% of carbon, and the gold particle size was extremely small （ most less than 2 μm）. Flotation concentrate had a low grade of gold, and sulfur and arsenic were inseparable. It was a typical refractory metallurgical gold ore, gold extraction rate was only 10.21% with direct cyanide leaching. According to the characteristics of this samples, efficient strain breeding, biological pre-oxidation process and cyanide leaching were studied. The results showed that from the five species which were collected from Nibao Gold mine （ NB）, Zijinshan Copper mine （ ZJ ）, Baishan Nickel and Cobalt Copper mine（ BS）, Mojiang Nickel and Cobalt mine（ MJ）, Dexing Copper mine（ DX）, NB strains were chosen in test and got the final NB strains through constantly adapter and domestication. Through biological pre-oxidation of 15 d the sulfur oxida- tion rate was 49.31%, and the gold leaching rate was 80.18%. The community of micro-organisms in the pre-oxidation system was studied by building 16SrDNA clone library conduction, the results showed that the oxidation system included not only bacteria but also included the archaea. Bacteria mainly composed of the Sulfobacillus sp. （52%）, Sulfobacillus thermotolerans （25%）, Leptospirillum ferriphilum （23%） , and the archaea was Ferroplasma acidiphilum.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2012年第6期947-952,共6页
Chinese Journal of Rare Metals
基金
国家科技部"十二五"科技支撑计划(2012BAB10B08)
863计划(2012AA060501)资助项目
关键词
难处理金矿
生物预氧化
氰化浸出
群落分析
refractory gold ores
biooxidation pretreatment
cyanide leaching
community analysis
