含铜、铋和银的金精矿堆浸工艺综合回收试验研究

现代地质 ›› 2006, Vol. 20 ›› Issue (2): 322-328.

含铜、铋和银的金精矿堆浸工艺综合回收试验研究

程东会¹，何江涛¹，王金祥²，李国斌²，沈照理¹

1中国地质大学水资源与环境学院，北京100083；2. 陕西省地质矿产局堆浸技术中心，陕西宝鸡721300

收稿日期:2005-12-05 修回日期:2006-03-18 出版日期:2006-02-20 发布日期:2006-02-20
作者简介:程东会，男，高级工程师，博士研究生，1969年出生，环境工程专业，主要从事地下水污染与控制和湿法冶金的研究工作。

Study on Comprehensive Recovery Technology for Gold Concentrate Containing Copper，Bismuth and Silver by Heap Leaching

CHENG Dong-hui¹, HE Jiang-tao¹, WANG Jin-xiang², LI Guo-bing², SHEN Zhao-li¹

1.School of Water Resources and Environment, China University of Geosciences, Beijing100083, China;
2. Heap Leaching Technique Center, Shaanxi Bureau of Exploration and Development of Geology and Mineral Resources, Baoji, Shaanxi721300, China

Received:2005-12-05 Revised:2006-03-18 Online:2006-02-20 Published:2006-02-20

摘要/Abstract

摘要：

采用生物氧化技术和化学方法，利用堆浸工艺分步提取，对含Au 140～150 g/t、Ag 900～1 000 g/t、Bi 9.0%～10.0%、Cu14%～17%的多金属浮选金精矿的综合回收工艺进行了研究。经小型搅拌试验，确定了生物氧化浸铜—氰化浸金、NaCl-FeCl₃-HCl体系（氯盐法）浸出铋和银的技术方法。通过柱浸试验，研究了利用该方法分步浸取Au、Ag、Cu和Bi在堆浸工艺中的可行性。在10 t精矿的扩大试验验中，验证了柱浸试验所取得的工艺指标和参数。试验中掺入骨架材料，解决了精矿在堆浸中的渗透问题；生物氧化过程中，菌种在含高浓度铜离子浸出液中反复驯化，对铜的耐受力提高到30 g/L；在NaCl-FeCl₃-HCl体系浸出Bi和Ag时，用H₂O₂将浸出液中的Fe²⁺氧化成Fe³⁺，使浸出液能循环使用，且Bi和Ag同时浸出。Au、Ag、Cu和Bi的最终浸出率分别为92.98%、65.09%、45.33%和53.49%。

关键词: 含铜、铋和银的金精矿, 堆浸工艺, 综合回收, 生物氧化, 氯盐法

Abstract:

In this paper, the comprehensive recovery technology for gold concentrate containing Au 140-150 g/t, Ag 900-1,000 g/t, Bi 9.0%-10.0% and Cu 14%-17% was studied by heap-leaching with bacterial oxidation and chemical process. In preliminary test, the technology that bacterial oxidation leaching of Cucyanidation leaching of Au and NaCl-FeCl₃-HCl method leaching of Bi and Ag was found out by the stirred experiment. This technique was applied to leach of Au, Ag, Cu and Bi in the column experiment. The parameters in column experiment were testified to be steady and reliable in scale-up test. The penetrability of concentrate was improved by mixing the coarse sand into concentrate; The copper endurance of the bacterial was increased by acclimation, up to 30 g/L. The leaching solution of NaCl-FeCl₃-HCl system may be used repeatedly because Fe²⁺becomes Fe³⁺ in solution by the H₂O₂ oxidation, and Ag, Bi may be leached simultaneously. The recovery rate of Au, Ag, Cu and Bi is 92.98%, 65.09%, 45.33%, 53.49% respectively.

Key words: gold concentrate containing Cu, Bi, and Ag, heap leaching, comprehensive recovery, bacterial oxidation, NaCl-FeCl₃-HCl system

中图分类号:

程东会何江涛王金祥李国斌沈照理. 含铜、铋和银的金精矿堆浸工艺综合回收试验研究[J]. 现代地质, 2006, 20(2): 322-328.

CHENG Dong-hui, HE Jiang-tao, WANG Jin-xiang, LI Guo-bing, SHEN Zhao-li. Study on Comprehensive Recovery Technology for Gold Concentrate Containing Copper，Bismuth and Silver by Heap Leaching[J]. Geoscience, 2006, 20(2): 322-328.