Bacterial leaching of copper ore raw material - bacterial le
2020-11-10 14:59Introduction：Bacterial leaching of copper ore raw material - bacterial leaching production practice 1 At present, the bacterial leaching process of copper and uranium is mature, and the leaching of copper can be recovered by extract-electrodeposition o
Bacterial leaching of copper ore raw material - bacterial leaching production practice 1
At present, the bacterial leaching process of copper and uranium is mature, and the leaching of copper can be recovered by extract-electrodeposition or iron display-flotation.
There are many examples of using bacteria in mineral processing in China, such as bacteria leaching from a copper mine in Guangdong province, a copper mine in Anhui province, and a copper mine in Hunan province.
The leachate was leached by thiobacillus ferric oxide, The production process is bacterial leaching, extraction and electrodeposition.Production practice shows that about 50% copper leaching speed is fast, and the rest 50% is slow.In order to adapt to this characteristic, a large amount of leaching solution was put forward at the initial stage to accelerate leaching. In the later stage of leaching, the method of leisure and dumping was adopted to accelerate the oxidation of copper sulfide. Meanwhile, to meet the requirements of subsequent cupric extraction, the acidity of leaching agent was reduced at the later stage to improve the pH of leaching solution.The copper content in the leachate was kept constant by 9 leachate in turn, the leaching period was 60 ~ 90 days, the copper leaching rate was 79.5%, the primary copper sulfide was 42.9%, the secondary copper sulfide was 77.4%, and the copper oxide was 93.6%.
The leachate was filtered by clarified sand, then four-stage extraction was performed with 7% N510 solution of 200 solvent oil, and the extraction rate was 85%.The content of organic phase copper loaded was 1.4g/L, and the waste electrolyte containing 200g/L of sulfuric acid and 40g/L of copper was used for tertiary reverse extraction, with the reverse extraction rate reaching 99%.Composition of copper-rich soution: 45g/L of copper, 200g/L of sulfuric acid, 6.5g/L of iron.
At the time of electrodeposition, lead-antimony alloy plates containing 8% antimony were used as anode, stainless steel plates as cathode, trough voltage was 1.9-2.1V, current density was 111A/m2, homopolar distance was 100mm, copper-rich solution flow rate was 5.6L /min.
Because of the long leaching cycle and low leaching rate, the popularization and application in production are limited.For some poor mines, bacterial leaching has its advantages.
