The process of extracting rare earth from southern rare earth ore by p204 extraction

Abstract

The invention discloses a process for extracting rare earths from southern rare earth mines by the P204 extraction method. Specifically, the southern ion adsorption type rare earth raw ore is used as raw material, ammonium sulfate, sodium chloride or ammonium chloride is used as a leaching agent, P204 is used as an extraction agent, and TBP is The demulsifier, ammonia water or sodium hydroxide is the neutralizing agent, and the extractant P204 promotes the leaching agent to leach the rare earth ions in the raw material. First, the rare earth raw ore is wetted with a leaching agent solution and part of the rare earth ions is leached. Secondly, the kerosene solution of P204 and TBP was added under stirring to promote the leaching of rare earth ions. Use intermittent stirring, and start adding ammonia solution or sodium hydroxide solution for the last stirring. Finally, let stand to separate layers, and the upper layer is the P204 organic phase loaded with rare earths, which is directly used for fractional distillation, extraction and separation of rare earths. The invention has a short technological process, a rare earth extraction rate as high as 94% to 97%, no waste water discharge, and a high degree of greening.

Description

technical field [0001] The P204 extraction method of the present invention extracts rare earths from southern rare earth ores. Together with the agent, the leaching agent can be used to leaching the rare earth ions in the southern ion-adsorption type rare earth ore, so as to realize the efficient extraction of rare earth elements. The invention belongs to the technical field of rare earth extraction. Background technique [0002] Southern rare earth ores are mainly distributed in the southern provinces of my country and are scarce in the world. The rare earth elements in them are adsorbed in the state of cations on aluminosilicate minerals such as kaolinite with the ability to exchange and adsorb cations. The rare earth content in the original southern rare earth ore is 0.05% to 0.3% in terms of rare earth oxide (REO), and the grade is low, which has a negative impact on extraction. The extraction methods all belong to the leaching method, and the implementation methods of...

AI Technical Summary

Problems solved by technology

[0015] It is not difficult to see that the existing ion-adsorption type rare earth raw ores mainly have the following disadvantages from leaching to extraction and separation: 1) in industrial production, the extraction rate of rare earths in the leaching process is about 70%, and the yield of rare earths is low; After leaching, precipitation, filtration, washing, burning, acid dissolution and extraction and other process steps, the process flow is long, which further reduces the extraction rate of rare earths; 3) the consumption of water and ammonium sulfate as a leaching agent is large; 4) leaching The ammonium sulfate agent cannot be recycled, and the discharge of ammonia nitrogen wastewater is large, polluting the environment

By the way, let me explain here that the above process steps of precipitation, filtration, washing, burning and acid dissolution will cause 1% to 2% loss of rare earths in each step.

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