Method for continuously removing impurities from rare earth chloride feed liquid through extraction troughs

Abstract

The invention provides a method for continuously removing impurities from rare earth chloride feed liquid through extraction troughs. The method comprises the following steps that S1, ionic adsorptiontype rare earth ore is subjected to extraction separation through a P507-kerosene-octanol-hydrochloric acid system, and rare earth feed liquid with the C1- concentration being 3-5 mol / L is obtained;S2, the rare earth feed liquid enters in via the second-stage extraction trough, an extraction agent and purified water enter in via the nth-stage extraction trough, and the rare earth feed liquid isopposite to the extraction agent and the purified water in flowing direction; S3, the rare earth feed liquid enters the nth-stage extraction trough after flowing through the third-stage extraction trough, and after standing in a clarifying and separating trough, separation is conducted, and the processed feed liquid and tail-end organic phases are obtained; S4, after flowing through the nth-stageextraction trough, the extraction agent meets the rare earth feed liquid and is subjected to reverse mixed extraction together with the rare earth feed liquid in the second-stage to nth-stage extraction troughs; and S5, in a backwashing trough, the organic phases like the extraction agent are backwashed through acid liquid. According to the method for removing the impurities, the impurities, suchas iron ions, aluminum ions and heavy metal ions, in the rare earth feed liquid can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of rare earth preparation, and in particular relates to a method for continuously removing impurities in a rare earth chloride feed liquid by using an extraction tank. Background technique [0002] Most of the rare earth in the ion-adsorption type rare earth ore is adsorbed on the surface of aluminosilicate mineral particles such as kaolinite in the ionic phase. In the immersion solution, the content of non-rare earth impurities in the rare earth material liquid was reduced after early treatment with oxalic acid precipitation method and bicarbonate plating precipitation method, but there were still a certain amount of non-rare earth impurities such as iron, aluminum and some heavy metal ions in the rare earth concentrate. mine. During the rare earth extraction and separation process, these feed liquids containing non-rare earth impurities will cause the emulsification of the extractant and the increase of three-phase...

AI Technical Summary

Problems solved by technology

Although this kind of equipment can satisfy the operation of the separation and extraction tank, it has the following disadvantages: 1. The impurity removal process is intermittent production, which requires many equipment, long steps, and a large backlog of process materials; 2. The extraction and removal process requires The impurity removal effect is easily affected by human factors; 3. After the impurity removal, the feed liquid can only be introduced into the separation extraction tank through the high level tank or the pump to control the flow rate, and it is difficult to synchronize the flow rate with the separation extraction tank

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