Method for removing impurities from rare earth ore leachate

Abstract

The invention discloses a method for removing impurities from rare earth ore leachate. The method comprises the steps that suspended matter, sediment and silicon are removed simultaneously, specifically, a mixed impurity removal agent is added into the rare earth ore leachate to be subjected to stirring reaction under a heating or no-heating condition and to be subjected to still standing and solid-liquid separation, and filtrate is collected for the subsequent step; the mixed impurity removal agent is a combination of two or more of polyacrylamide, barium chloride, diatomite and polyethyleneglycol, or a combination of polyaluminum chloride and/or polyferric sulfate and one or more of polyacrylamide, barium chloride, diatomite and polyethylene glycol; the solid-liquid ratio of the mixed impurity removal agent to the rare earth ore leachate is 0.001-1kg:100L. Through the method, the impurities such as the suspended matter, sediment and silicon in the rare earth ore leachate can be effectively removed, and disturbance of the impurities on extraction and separation of rare earth elements is avoided.

Description

technical field [0001] The invention relates to a method for removing impurities in leach liquor of rare earth ores, belonging to the field of rare earth smelting. Background technique [0002] Rare earth ores are the main rare earth resources, among which ion-adsorbed rare earth ores are abundant in southern my country and widely distributed. The first step in the smelting of ion-adsorption rare earth ores is to transfer the rare earth elements into the leaching solution with an acid solution, and then separate the 15 kinds of rare earth elements one by one by solvent extraction, usually using P507, P204, naphthenic acid-based extraction Reagent system to separate rare earth elements. In recent years, non-saponifiable P507, P204, and naphthenic acid extractant systems have attracted much attention in the extraction and separation of rare earth elements. [0003] During the acid leaching process of rare earth ores, non-rare earth impurities in rare earth ores such as iron,...

AI Technical Summary

Problems solved by technology

However, the presence of aluminum, silicon, and suspended solids in the leaching solution will cause the third phase and emulsification of the N235 iron removal system, and the presence of iron will reduce the extraction capacity of naphthenic acid extraction of aluminum. In addition, the commonly used saponification ring The phase separation time is very long in the process of aluminum removal with alkanoic acid. The presence of silicon and suspended matter not only prolongs the phase separation time, but also causes emulsification and unclear phase separation in the aluminum removal system with naphthenic acid.

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