Method for recycling uranium from uranium extraction coal residue with wet method

Abstract

The invention discloses a method for recycling uranium from uranium extraction coal residue with a wet method, which comprising the following steps: (1) particle size requirements: crashing the coal residue below 200 meshes; (2) oxidation and acid leaching: in a dilute sulphuric acid-hydrofluoric acid medium, using peroxide as an oxidizer to carry out reverse oxidation leaching twice; (3) desilicification and purification: using ammonia to adjust the pH value of once leaching filtering liquid of the uranium to 9.8-10.2, enabling the silicon in the solution to become silicic acid sediments, after filtering, carrying out ion exchange on the filtering liquid, desilicificating slag and stockpiling; (4) ion exchange: using a 717 type ion exchange resin to carry out exchange absorption by the filtering liquid, and then using 1 mol / L of NaCl-0.1 mol / LH2SO4 of mixed solution to elute the resin, after using tributyl phosphate to carry out extraction and back-extraction on eluent, obtaining uranium concentrates containing about 65% of the uranium. The invention successfully extracts and separates the uranium from the uranium extraction coal residue to produce the uranium concentrates, has t high recycling rate of uranium as high as 80-85% and low cost, and comprehensively utilizes the uranium extraction waste, thereby eliminating the influence of the radiation wastes on the ecological environment.

Description

technical field

[0001] The invention relates to the technical field of metallurgy, in particular to a method for wet recovery of uranium from germanium extraction coal slag. Background technique

[0002] The Lincang area of ​​Yunnan Province is rich in uranium resources, and most of the uranium is associated with lignite mines in the Bangmai Basin. The content of uranium in lignite mines is 30-100g / t. Although there is no exact uranium reserve report, a large amount of coal cinders in the Bangmai Coal Mine after extracting germanium by fire method all contain 150-250g / t of uranium. Uranium has been enriched 2 to 4 times. After more than 30 years of germanium extraction in the Lincang area, a large amount of uranium-containing cinders have been produced. However, due to uranium extraction technology and cost reasons, the uranium has not been extracted. Such a large amount of high-uranium-containing cinders have been stored for a long time. First, it has caused high radioacti...

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