新颖两步法提高阿希高硫金精矿生物氧化效率
Novel two-step process to improve efficiency of bio-oxidation of Axi high-sulfur refractory gold concentrates
刘新星 1王国华 1霍强 1谢建平 1李寿朋 1武海艳 1郭玉洁1
作者信息
- 1. 中南大学资源加工与生物工程学院,长沙410083;中南大学生物冶金教育部重点实验室,长沙410083
- 折叠
摘要
为提高阿希难处理金精矿的生物氧化效率,利用两步氧化法(高温化学氧化与随后的生物氧化)处理阿希金精矿,并优化了生物氧化阶段的溶液pH.结果表明,两步法生物氧化阶段最优pH范围为1.0～1.2,在此条件下,既能保持微生物的氧化活性又能减少铁钒沉淀的生成,可以有效提高氧化效率;铁、硫的氧化率分别提高了12.50％与15.49％,提金率提高了21.02％.因此,两步氧化法联合pH调控是一种高效氧化阿希金精矿的方法,在今后处理复杂难处理金精矿领域中具有广阔的应用前景.
Abstract
In order to improve the bio-oxidation efficiency of Axi refractory gold concentrate,a two-step process including a high temperature chemical oxidation and a subsequent bio-oxidation,combined with pH control during the bio-oxidation step was used.The results revealed that the optimum mode was to maintain solution pH at 1.0-1.2 during the biological oxidation stage.Under this condition,the activity of mixed culture could be sustained and the formation of jarosite could be diminished,thus the oxidation efficiency was improved.The oxidation levels of iron and sulfur were improved by 12.50％ and 15.49％,and the gold recovery was increased by 21.02％.Therefore,the two-step process combined with pH control is an effective method for oxidizing the biohydrometallurgical process of Axi gold concentrate,and it will have a broad prospect of application in dealing with complex refractory gold concentrate.
关键词
金精矿/生物氧化法/pH调控/两步氧化法Key words
gold concentrate/bio-oxidation/pH control/two-step oxidation引用本文复制引用
基金项目
supported by the National Basic Research Program of China(2010CB630901)
supported by the 53rd China Postdoctoral Science Foundation(2013M531814)
出版年
2015
NETL
NSTL
维普
万方数据