摘要
位于我国陕西省南部的庞家河金矿，属于含砷黄铁矿和黄铁矿的难浸金矿，该矿的常规氰化浸出率仅40％。试验研究证明，经过硫铁氧化细菌氧化处理之后，可以大幅度提高该矿的氰化浸出率。在探索性试验基础上，进行了连续1个月的细菌氧化及氰化浸出台架试验。所用细菌为经过驯化的氧化铁硫杆菌。在矿浆液固质量比6．3：1、pH1．5～1．6、温度为29～35℃、氧化时间为90～110h条件下，矿石中砷的平均氧化率为70％～75％，硫的平均氧化率为45％～55％，氧化渣用石灰中和后氰化浸金，金浸出率为90％～92％。氧化液中砷的质量浓度均为1．25g／L，绝大部分为五价砷，用石灰中和生成砷酸铁沉淀，沉淀后的砷十分稳定，放置6个月未发生返溶现象，可以安全存放，不会污染环境。
Pangjihe gold mine which is explored in the south of Shanxi province of China is a goldbearing arsenopyrite and pyrite ore. The recovery by conventional cyanide leaching is only about 40%. A continual test system of bio-oxidation and cyanide leaching at bench scale has been operated for more than one month. The tested results indicated that the average arsenic oxidation rate was 70%-75 %, the average sulfur oxidation rate 45%-55% and the gold cyanide leaching recovery 90%-92 % when feed pulp was controled at 15 % (W/V),pH 1.5~ 1. 6,the temperature 28~32℃ and the duration of biooxidation 90-110 h.The arsenic in the effleunt was precipitated as ferric arsenate which can not be redissolved.
出处
《铀矿冶》
CAS
1999年第1期32-38,共7页
Uranium Mining and Metallurgy
