Ultrasonic leaching-extracting separation method for sulphating roasting rare earth mine

Abstract

The invention discloses an ultrasonic leaching-extracting separating method of rare earth ore sintered by sulfuric acid, which comprises the following steps: adopting sulfuric acid solution as leaching liquid; allocating extracting liquid through P204, P507 and kerosene; proceeding leaching-extracting separating operation for rare earth ore through ultrasound with strength at 0.2-20.0W / cm2 and frequency at 19-80kHz under 5-60 deg.c; obtaining the enriched product of middle heavy rare earth (yttrium group rare earth element) sulfate as extracting phase and light rare earth (cerium group rare earth element) sulfate as residual phase.

Description

Technical field: [0001] The invention relates to a method for separating rare earth ores roasted with sulfuric acid, and belongs to the field of hydrometallurgy. Background technique: [0002] Bastnaesite, bastnaesite, monazite and its mixed rare earth ores are raw materials for the production of sulfuric acid roasted rare earth ores. At present, the usual separation method of sulfuric acid roasted rare earth ores is: sulfuric acid roasting of rare earth ores-rare earth leaching-solvent extraction, which is It is a mature and stable process route in the current industrial production of rare earth separation. The process uses the above-mentioned rare earth ore and sulfuric acid as raw materials. After roasting, the rare earth is converted into water-soluble sulfate, and then water is used as a solvent for leaching. After neutralization and impurity removal, the resulting leachate is extracted and separated. Get rare earth products. In this process, the current leaching oper...

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Problems solved by technology

[0004] ①The separation process route is long, both leaching equipment and extraction equipment are required, and the production capacity of the equipment is low;

[0005] ②As the extraction proceeds, the rare earth elements of the yttrium group are continuously transferred from the water phase to the extraction phase, which reduces the concentration of the rare earth elements of the yttrium group in the water phase, thereby slowing down the extraction rate, and the content of the rare earth elements of the yttrium group in the obtained extraction phase Low, 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 elements of the cerium group in the obtained raffinate phase has also not reached the saturation concentration. In the separation process, the material handling capacity is large, and the separation of impurities difficulty

Not only the comprehensive yield of yttrium group rare earth elements and cerium group rare earth elements is low, but also the amount of feed liquid to be processed in the subsequent refining process is very large. If clean production with zero discharge is to be achieved, the processing cost is very high. If it is not treated, it will be exacerbate environmental pollution;

[0006] ③ The leaching and extraction rate and efficiency in the existing separation process are low, and the economic and social benefits are not high

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