Method for separating enriched uranium, thorium mixture and rare earth from preferred slag

Abstract

The invention discloses a separating method of enriched uranium and thorium composition and rare earth, which comprises the following steps: leaching slag; extracting; separating extracting phase, residual phase and insoluble solid; obtaining the product.

Description

Technical field: [0001] The invention relates to a method for separating and enriching uranium, thorium mixture and rare earth from high-quality molten slag, which belongs to the field of hydrometallurgy. Background technique: [0002] Excellent slag is a mixture of rare earths containing thorium and uranium. Its main chemical components are hydroxides of rare earth, thorium and uranium, a small amount of silicate and insoluble minerals. After leaching, extraction and separation, excellent slag can be obtained Thorium, uranium mixtures and rare earths. At present, the following methods are usually used to separate the mixture of thorium and uranium and rare earths. The main separation steps are: 1. Nitric acid leaching and dissolving: use nitric acid aqueous solution to soak and dissolve the excellent molten slag in the leaching equipment; 2. Solid-liquid separation: Solid-liquid separation and impurity removal to obtain a mixed material liquid containing thorium, uranium a...

AI Technical Summary

Problems solved by technology

The main disadvantages of this separation method are:

[0003] ①The separation process route is long, both leaching equipment and extraction equipment are required, and the production capacity of the equipment is low;

[0004] ②As the extraction proceeds, thorium and uranium are continuously transferred from the aqueous phase to the organic extraction phase, which greatly reduces the concentration of thorium and uranium in the aqueous phase, thereby slowing down the extraction rate and resulting in a mixture of thorium and uranium in the extracted phase. The content of rare earth in the raffinate phase is relatively low, and it is impossible to reach the saturation concentration. To reach the saturation concentration, the load of subsequent evaporation and concentration must be increased; the content of the rare earth in the obtained raffinate phase also does not reach the saturation concentration. In the separation process, the amount of material is large, and it is difficult to remove impurities and separate

Not only is the comprehensive yield of thorium, uranium and rare earths low, but also the amount of feed liquid to be treated in the subsequent refining process is large. If clean production with zero emissions is to be achieved, the treatment cost will be high, and environmental pollution will be aggravated if not treated ;

[0005] ③ The leaching and extraction rate and efficiency in the existing separation process are low, and the economic and social benefits are not high