Recovery method of rare earth elements in ionic rare earth smelting acid dissolution slag

Abstract

The invention discloses a recovery method of rare earth elements in ionic rare earth smelting acid dissolution slag for solving technical problems in prior arts. The method comprises the steps of: (1) acid slag primary activation washing; (2) secondary activation washing; (3) ternary activation washing; and (4) rare earth recovery. With the method provided by the invention, rare earth elements in acid dissolution slag can be effectively recovered.

Description

technical field [0001] The invention relates to a method for recovering rare earth elements in acid-dissolved slag formed in the ionic rare earth smelting process, and belongs to the technical field of comprehensive utilization and treatment of solid waste in the rare earth smelting industry. Background technique [0002] Rare earths are widely used in new energy, new materials, energy conservation and environmental protection, aerospace, electronic information and other fields. In the smelting process of ionic rare earths, the first step of acid dissolution process is to dissolve rare earth concentrates with hydrochloric acid to form rich Feed liquid of rare earth elements, some impurities in rare earth concentrate that cannot be dissolved by hydrochloric acid, such as rare earth fluoride, radioactive elements, heavy metal salts, barium salts, gravel, etc., are mechanically dehydrated to form acid-soluble slag. During the formation of acid-dissolved slag, impurity particles...

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Problems solved by technology

The rare earth elements precipitated with impurity particles can be dissolved by simple water washing or pickling, but when the impurities are mechanically dehydrated, due to the inherent defects of solid-liquid separation, part of the solution containing rare earth elements remains in the impurities, affecting the acid-dissolved slag. Rare earth recovery effect; rare earth fluorides cannot be dissolved in single ordinary acids such as hydrochloric acid and sulfuric acid, and more oxidizing acids are needed to convert rare earth elements in fluorinated rare earths into soluble rare earth element ions, so simply use a single Common acid can only dissolve a small amount of soluble rare earth elements, and some rare earth fluorides that are difficult to tolerate are still insoluble, and the rare earth elements in the acid-dissolved slag cannot be recovered to the maximum extent.

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