Method for extracting gold from low-grade gold ore by biological heap leaching
A low-grade, gold mining technology, applied in the field of gold extraction, can solve the problems of labor costs and capital cost losses, and achieve the effects of low cost, saving capital and labor costs, and high resource utilization
Pending Publication Date: 2021-07-16
辽宁省国旺技术服务有限公司
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Problems solved by technology
However, the dripping liquid used in the heap leaching gold extraction technology is mostly sodium cyanide, which is a highly toxic product. It is necessary to build a factory for dripping gold extraction in a closed workshop, so that the site and the amount of gold extracted each time There will be restrictions, only ore with high gold content can be refined, otherwise labor costs and capital costs will cause losses
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[0016] In order to further illustrate the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.
[0017] Such as figure 1 Shown, a kind of low-grade gold ore biological heap leaching method of the present invention comprises the following steps:
[0018] ① The raw ore or low-grade ore directly participates in the gold extraction process, and the raw ore or low-grade ore forms an ore pile, and two layers of geotextiles and one layer of plastic cloth are placed at the bottom of the pile at the initial stage to prevent leakage at the bottom;
[0019] ②Use lime or caustic soda to adjust the alkalinity of the ore heap or pulp, and adjust the pH value to 11-12;
[0020] ③On the ore heap, use a spray pipe to spray the non-toxic environmental protection gold beneficiation agent Jinchan on the ore pile, add 400g...
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The invention discloses a method for extracting gold from low-grade gold ore by biological heap leaching. The method comprises the following steps: (1) raw ore or low-grade ore forms an ore building heap, and two layers of geotechnical cloth and a layer of plastic cloth are placed at the bottom at the initial heap leaching stage; (2) the alkalinity of ore heaps or ore pulp is adjusted by lime or caustic soda; (3) a Jinchan leaching reagent is sprayed to the ore building heap on an ore heap by using a spraying pipe, specifically, 400 g-2000 g of the Jinchan leaching reagent is added into each ton of the ore heap, and the mass concentration of the Jinchan leaching reagent is 0.3-1.5 per thousand; (4) an obtained solution flows into a pregnant solution pool, a carbon tank is filled with the solution in the pregnant solution pool, carbon adsorption is conducted to obtain gold mud, and finally gold is obtained through extraction; and (5) after the solution enters the carbon tank from the pregnant solution pool for carbon adsorption, a generated solution without gold flows into a barren solution pool, the Jinchan leaching reagent is supplemented for backwater, the pH value is regulated and kept at 11-12 again, then the solution is directly pumped into the ore heap by a pump for cyclic utilization, and leached tailings are directly piled in a waste tailing pond on the spot. The method is free of pollution and emission.
Description
technical field [0001] The invention relates to a gold extraction method, in particular to a low-grade gold ore biological heap leaching gold extraction method. Background technique [0002] With the large-scale mining of easy-to-mining mines, the development and utilization of low-grade ores and refractory gold ore resources has become an important task in gold mining. At present, heap leaching gold extraction technology has been popularized and applied in many countries because of its low cost and good benefit. However, the dripping liquid used in the heap leaching gold extraction technology is mostly sodium cyanide, which is a highly toxic product. It is necessary to build a factory for dripping gold extraction in a closed workshop, so that the site and the amount of gold extracted each time There will be restrictions, and only ores with high gold content can be refined, otherwise labor costs and capital costs will cause losses. Contents of the invention [0003] The ...
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IPC IPC(8): C22B3/18C22B11/00
CPCC22B3/18C22B11/04Y02P10/20
Inventor 王东晨
Owner 辽宁省国旺技术服务有限公司