Acid ore washing biological leaching process used for high mud alkaline uranium ore

Abstract

An acid ore washing biological leaching process used for high mud alkaline uranium ore comprises the following main steps: after crushing and screening of raw ore, sending + 30 mm particle grade ore into a heap field for heap construction, and performing acid ore washing treatment on-30mm particle grade ore. Sulfuric acid is added into a washing solution, then part of basic gangue is removed by ore washing, the washing solution is separated and precipitated, and an acid solution can be recycled. After processing by the acid ore washing system, + 0.074mm particle grade sand ore is sent to the heap field for heap construction, and-0.074mm particle grade sand ore enter the intensive agitation leaching process. An agitation leaching solution and a heap leaching solution are merged, and enter ion exchange resin adsorption desorption process, and finally a qualified enriched uranium product is obtained. According to the process, in the ore washing process, the part of basic gangue easy to dissolve is removed by neutralization, the problems of poor heap leaching permeability, low uranium leaching rate and the like caused by existence of mud ore and dissolution precipitation of the basic gangue can be solved, the uranium recovery rate is improved, high mud alkaline uranium ore mineral resources can be comprehensively utilized, and greater economic benefits can be obtained.

Description

technical field [0001] The invention relates to the technical field of uranium ore biological leaching, in particular to a uranium ore acid washing and leaching process. Background technique [0002] The technology of bioleaching uranium ore has production and application examples in the former Soviet Union, Canada, and the United States. In recent years, the research work of bioleaching uranium ore has been carried out in several uranium mines in China, and gratifying achievements have been obtained. China is a country that is not very rich in uranium resources. The proven uranium reserves rank after the 10th in the world, which cannot meet the long-term needs of nuclear power development. Moreover, my country's uranium mining and metallurgy industry is currently experiencing problems such as rising raw material prices, aging mines, shortage of investment in new mining sites, and economic losses in conventional hydrometallurgy processing. In this situation, bioleaching ur...

AI Technical Summary

Problems solved by technology

However, uranium ore is often mixed with a certain degree of mud and water. When the ore contains too much mud and water, it will have an adverse effect on the leaching process. Alkaline compounds such as calcium and magnesium oxides enter the leachate after leaching, and a large amount of precipitates and complexes will also be produced, which will act together with the ore slime to cause poor permeability and air permeability of the ore heap during the leaching process, and liquid ditch on the surface of the leaching heap. A series of problems such as flow, slow leaching speed of uranium ions, and low leaching rate will deteriorate the leaching effect and leaching indicators, and increase production costs

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