The project utilizes the research results of the pre-biooxidation gold extraction process, targeted cultivation and domestication of heap leaching leaching strains, and on the basis of completing the small experiment of bio-oxidation heap leaching process, the Liaoning Jinfeng Gold Mining Co., Ltd. Typical low-grade refractory gold resources for development and utilization, systematically completed the experimental research and engineering technology research of bio-oxidation heap leaching gold extraction process, developed economically reasonable and technically in line with China's national conditions and with independent intellectual property rights. A viable bio-oxidation-stack leaching gold extraction process technology.
The completed industrial test proves that the low-grade refractory gold ore used in the Fengcheng area of ​​Liaoning Province has good effect, simple and easy operation, and low investment cost. Therefore, it has a very broad prospect for promotion.
The appraisal committee headed by Academician Qiu Dingfan formed the following appraisal opinions:
1. The bio-oxidation-heap leaching gold extraction process for low-grade refractory gold mines can increase the recovery rate of gold from 7.57% of direct leaching to 54.51%, of which the leaching rate of -4mm oxidized slag reaches 72.93%. The benefits are significant.
2. The mixed bacteria used in the biooxidation process has the characteristics of strong environmental adaptability, high oxidation activity and wide temperature tolerance (10 °C ~ 45 °C).
3. The project has simple process, low operating cost and high leaching rate of gold, which can achieve overall consideration of environmental, economic and social benefits. It is an effective way to deal with the comprehensive recovery of low-grade refractory gold resources.
Experts agreed that the project has reached the domestic leading level.
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