Method for depositing rare earth through oxalic acid

A rare earth, oxalic acid technology, applied in the direction of improving process efficiency, can solve the problems of complicated operation and long process, and achieve the effect of saving reagent consumption

Active Publication Date: 2016-11-16
CHINA MINMETALS BEIJING RES INST OF RE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a long process and relatively complicated operation

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  • Method for depositing rare earth through oxalic acid

Examples

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Effect test

Embodiment 1

[0031]An enterprise originally precipitated yttrium oxalate. Under the traditional precipitation method, the rare earth recovery rate is 98.5%. The average production ton of yttrium oxide consumes about 2.1 tons of oxalic acid, and the back extraction consumes 3.5 tons of 31% hydrochloric acid, producing about 15 cubic meters of grass precipitation mother liquor (oxalic acid precipitation mother liquor , the same below), neutralizing these grass sink mother liquors needs to consume 1.3 tons of 80% lime.

[0032] The method of the invention is adopted to improve the precipitation step and recover the primary and secondary precipitation mother liquors for the stripping of easy-to-extract components and the preparation process of the oxalic acid solution.

[0033] After improving the process, the rare earth content and oxalic acid concentration in the primary precipitation mother liquor are both about 0.05mol / L, and the average concentration of HCl is 2mol / L. In the primary preci...

Embodiment 2

[0035] An enterprise originally precipitated lanthanum oxalate, and the original process produced 1 ton of lanthanum oxide and consumed 1.4 tons of oxalic acid on average, and produced about 10 cubic meters of grass-sedimented mother liquor. Neutralizing these grass-settled mother liquors consumed 0.85 tons of lime.

[0036] The method of the invention is adopted to improve the precipitation step and recover part of the precipitation mother liquor for the dissolution of raw material oxide and the preparation process of oxalic acid solution.

[0037] After improving the process, the rare earth content in the primary precipitation mother liquor is 0.5mol / L, the concentration of oxalic acid is 0.01mol / L, and the concentration of hydrochloric acid is 3mol / L, and the primary precipitation mother liquor is used for the dissolution process of raw material oxides, saving an average of 31% per ton of oxides 2.2 tons of dissolved hydrochloric acid; the concentration of HCl in the seconda...

Embodiment 3

[0039] A southern mine separation company originally precipitated gadolinium oxalate. Under the traditional precipitation method, the rare earth recovery rate is 98.9%. The average production ton of gadolinium oxide consumes about 1.3 tons of oxalic acid, and the back extraction consumes 2.0 tons of 31% hydrochloric acid, producing about 8 cubic meters of grass precipitation mother liquor. Neutralizing the mother liquor of these grass deposits needs to consume 0.8 tons of 80% lime.

[0040] The method of the invention is adopted to improve the precipitation step and recover the primary and secondary precipitation mother liquors for the stripping of easy-to-extract components and the preparation process of the oxalic acid solution.

[0041] After improving the process, the rare earth content and oxalic acid concentration in the primary precipitation mother liquor are both about 0.02mol / L, and the average concentration of HCl is 1mol / L. After the primary precipitation mother liqu...

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Abstract

The invention relates to a method for depositing rare earth through oxalic acid. The method comprises a rare earth dissolving material using process, a process for obtaining a rare earth chloride solution through extraction and reverse extraction and a rare earth depositing process. The rare earth depositing process comprises the steps that primary depositing with rare earth relatively excess is conducted on the rare earth chloride solution through an oxalic acid solution; one part of primary depositing mother liquor is directly recycled and used for the rare earth dissolving material process or the reverse extraction step; secondary depositing with oxalic acid relatively excess is conducted on the surplus primary depositing mother liquor through the oxalic acid solution; and secondary depositing mother liquor obtained in the second depositing process is totally recycled and used for depositing. By means of the method for depositing the rare earth through the oxalic acid, hydrochloric acid produced in the rare earth recycling process can be totally recycled, and the oxalic acid consumption amount can be equal to the stoichiometric ratio; the excess oxalic acid reagent consumption amount is substantially decreased, thus, the solutions in the whole recycling process can be recycled, and water for oxalic acid preparing is saved; and zero discharging of oxalic acid depositing mother liquor wastewater is achieved.

Description

technical field [0001] The invention belongs to the technical field of rare earth recovery, and in particular relates to a method for precipitating rare earth with oxalic acid. Background technique [0002] In the rare earth hydrometallurgy process, hydrochloric acid is generally used first to dissolve rare earth oxides, hydroxides or carbonate minerals, and then the rare earth product solution is obtained through the extraction and separation process. During the extraction and separation process, the refractory component elements are finally directly produced in the form of rare earth chloride product solution, and the easy-to-extract component is loaded by the extractant, which needs to be further back-extracted with hydrochloric acid to become a rare earth chloride product solution. [0003] The rare earth chloride product solution generally needs to be converted into a solid rare earth product through a precipitation process, that is, using a precipitant such as oxalic a...

Claims

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Application Information

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IPC IPC(8): C22B3/46C22B59/00
CPCC22B3/46C22B59/00Y02P10/20
Inventor 廖春生吴声程福祥王嵩龄刘艳张玻
Owner CHINA MINMETALS BEIJING RES INST OF RE
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