Sulfuric acid rare earth roasted ore treatment method

Abstract

The invention discloses a sulfuric acid rare earth roasted ore treatment method which comprises the following steps of 1) mixing sulfuric acid rare earth roasted ore with water, and leaching to obtaina first mother solution; adjusting the pH value of the first mother solution to obtain a sulfuric acid rare earth water leaching solution; reacting the sulfuric acid rare earth water leaching solution with a calcium chloride solid or a saturated calcium chloride solution to obtain a calcium sulfate solid and a rare earth chloride solution I; 2) mixing and leaching the rare earth chloride solutionI and rare earth sulfate roasted ore to obtain a second mother solution; adjusting the pH value of the second mother liquor to obtain a mixed solution II containing rare earth chloride and rare earthsulfate; and 3) reacting the mixed solution II containing the rare earth chloride and the rare earth sulfate with the calcium chloride solid or the saturated calcium chloride solution to obtain a calcium sulfate solid and an enriched rare earth chloride solution III. According to the sulfuric acid rare earth roasted ore treatment method provided by the invention, the amount of the water leachingresidues can be significantly reduced.

Description

technical field [0001] The invention relates to a treatment method for sulfuric acid rare earth roasted ore obtained by a sulfuric acid high-temperature roasting method. Background technique [0002] At present, the Baotou mixed rare earth concentrate is mainly decomposed by high-temperature roasting of concentrated sulfuric acid to obtain roasted ore of rare earth sulfate. Due to the low solubility of rare earth sulfate, a large amount of water is required for leaching; generally, rare earth sulfate roasted ore is mixed with water at a weight ratio of 1:7 to 12, and water leaching liquid and radioactive water leaching residue are obtained by leaching. The rare earth (REO) concentration in the water immersion solution is generally 30-40g / L. Since the concentration of rare earth sulfate solution is too low, in order to reduce subsequent production costs, it is necessary to transform it into a high concentration rare earth chloride solution for subsequent extraction and separ...

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Problems solved by technology

This patent document can realize the recycling of calcium chloride wastewater produced by extraction, but a large amount of calcium sulfate will be produced during the leaching transformation process with calcium chloride solution, and this part of calcium sulfate will be coated on the surface of roasted ore, which will increase the difficulty of rare earth leaching. The leaching efficiency is low; and the newly generated calcium sulfate is mixed with the insoluble radioactive waste residue in the roasted ore and cannot be separated, resulting in a significant increase in the amount of radioactive waste residue, increased difficulty in disposal, and high cost

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