A method for separating trace uranium from brine by co-precipitation

Abstract

Provided is a method for separating micro-uranium from bittern through a coprecipitation method. The method for separating the micro-uranium from the bittern through the coprecipitation method includes the following steps that precipitating agent water-soluble hydroxide or water-soluble carbonate or a combination of the precipitator water-soluble hydroxide and the water-soluble carbonate is added into the bittern till coprecipitate of uranium is generated, and then the coprecipitate of the uranium is filtered out by a microporous film, so that separation of the uranium from the bittern is completed; or the bittern with the coprecipitate generated is subjected to pressure air-dissolving, and the coprecipitate of the uranium is made to be separated from the bittern through a float-up clarification method; or the two separation methods are used in combination. According to the method for separating the micro-uranium from the bittern through the coprecipitation method, the coprecipitation method is adopted for gathering uranium elements in the bittern, and the bittern contains impurity ions (such as calcium and magnesium), so that the uranium in the solution, magnesium hydrate precipitate and calcium carbonate precipitate form the coprecipitate by adding a precipitating agent and a flocculating agent, the uranium elements can be separated from the bittern in a gathering mode, and then the magnesium hydrate precipitate and the calcium carbonate precipitate are separated from the bittern through pretreatment (the float-up clarification method) and filtering operation. The coprecipitation method is adopted for separating the uranium in the bittern in the gathering mode, the separation effect is good, and the uranium recovery rate can be up to 99.85%.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a method for separating trace uranium from brine by co-precipitation. Background technique [0002] With the increasing demand for energy at home and abroad and the increasing energy gap, the world's energy structure dominated by traditional energy such as oil and coal will inevitably change. As one of the most promising future energy sources for mankind, nuclear energy will play a major role; according to the International Atomic Energy Agency's prediction, nuclear power will account for at least 25% of all power in the world by 2030, and the maximum growth may reach 100%. [0003] As the most important nuclear energy resource at present, uranium will inevitably play an important role in future economic construction and national defense construction. However, the overall reserves of domestic uranium mines are not abundant, and the distribution is extreme...

AI Technical Summary

Problems solved by technology

As an unconventional uranium resource, underground brine is rarely developed and utilized