(1. 万宝矿产有限公司，北京 100053；
2. 中国科学院过程工程研究所湿法冶金清洁生产国家工程实验室，北京 100191)
摘 要: 缅甸蒙育瓦铜矿采用生物堆浸-萃取-电积工艺生产A级(Cu-CATH-1)阴极铜，矿石中主要铜矿物为辉铜矿，同时黄铁矿含量较高。生物堆浸提取有价金属铜时，部分黄铁矿氧化溶解生成硫酸高铁和硫酸，酸和铁的不断累积将给生产系统带来不利影响。本文介绍了蒙育瓦七星塘铜矿(K矿)生物堆浸特点，其矿体黄铁矿含量约为12.98%。当黄铁矿氧化率达到3.31%时，生产系统基本可以达到酸平衡。结合工业历史数据，分析了黄铁矿氧化的关键影响因素，对未来生产过程酸平衡情况进行了评估，并针对酸过剩问题提出了一系列可能的解决方案。
关键字: 七星塘铜矿；生物堆浸；辉铜矿；黄铁矿；氧化；酸平衡
（1. Wanbao Mining Limited, Beijing 100053, China;
2. National Engineering Laboratory for Hydrometallurgical Clean Production, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100191, China）
Abstract:Heap bioleaching-solvent extraction-electrowinning is applied in Monywa copper mine to produce A grade cathode copper in Myanmar. Chalcocite is the main copper mineraland quite high amount of pyrite is also included in the ore. During the process of extracting valuable copper from heap bioleaching, a part of pyrite was also oxidized and dissolved into the ferric sulfate and sulfuric acid, which has the adverse effect on the industrial production system. The main traits of Monywa Kyisintaung heap bioleaching practice were introduced. The pyrite content of Kyisintaung ore is about 12.98%. The acid balance during heap bioleaching is reached basically when the oxidation of pyrite reaches 3.31%. Combined with the historical industrial data, the critical factors related to pyrite oxidation were analyzedand the acid balance situation in the future was evaluated. It is suggested that the industrial heap bioleaching of Kyisintaung ore will probably be acid excessive.Some possible solutions are proposed to solve this challenge.
Key words: Kyisintaung copper mine; heap bioleaching; chalcocite; pyrite; oxidation; acid balance
