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Wet-method atmospheric oxidation method of cerium in rare earth hydroxides

A rare earth hydroxide and air oxidation technology, applied in the direction of improving process efficiency, can solve the problems of time-consuming, labor-intensive and large consumption, and achieve the effect of reducing water consumption and avoiding dust pollution

Active Publication Date: 2014-01-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, washing not only consumes a lot of water, but also takes time and energy.

Method used

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  • Wet-method atmospheric oxidation method of cerium in rare earth hydroxides

Examples

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Effect test

Embodiment 1

[0031] Prepare a rare earth nitrate solution with a concentration of 25g / L, add NaOH to adjust the alkalinity of the mixed slurry to 0.1mol.L -1 , Add sodium fluoride according to F / TCeO=1, and pass in 1L / min of compressed air at 80℃. After 4h, the oxidation rate of Ce(III) in the solution reaches 96.13%.

Embodiment 2

[0033] Prepare a rare earth chloride solution with a concentration of 50g / L, add NaOH to adjust the alkalinity of the mixed slurry to 0.5mol.L -1 , Add ammonium fluoride according to F / TCeO=3, and pass in 4L / min of compressed air at 100℃. After 10h, the oxidation rate of Ce(III) in the solution reaches 96.90%.

Embodiment 3

[0035] Prepare a rare earth nitrate solution with a concentration of 10g / L, and add NaOH to adjust the alkalinity of the mixed slurry to 1.0mol.L -1 , Add sodium dihydrogen phosphate according to P / TCeO=0.3, and pass in 0.5L / min of compressed air at 25℃. After 0.5h, the oxidation rate of Ce(III) in the solution reaches 89.58%.

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Abstract

The invention relates to a wet-method atmospheric oxidation method of cerium in rare earth hydroxides to solve technical problems that pretreatment of wet-method atmospheric oxidation methods at present consumes a large amount of water and is time-consuming and labor-consuming. The method provided by the invention comprises following steps of: (1) preparing mixed slurry having a REO concentration of 10-100 h / L of the rare earth hydroxides; (2) adjusting the alkalinity of the mixed slurry to be 0.1-1.5 mol*L<-1>; and (3) feeding compressed air at an air flow rate of 0.5-10 L / min and with an air feeding time of 0.5-10 h. The method provided by the invention is free of complex pretreatment. Quadrivalent cerium (IV) can form stable complexes with F and P, thus achieving an objective of fixing the F and the P in the rare earth hydroxides, reducing water consumption caused by subsequent F washing and P washing, and solving a time-consuming and labor-consuming problem in a washing section. Existence of the F has no influence on oxidation of the cerium. Even with the increase of the content of the P, the oxidation rate of the cerium can also reach 60%-98%.

Description

Technical field [0001] The invention belongs to the technical field of rare earth hydrometallurgy, and specifically relates to a method for wet air oxidation of cerium in rare earth hydroxide. Background technique [0002] In monazite, the cerium content accounts for about 45% of the total rare earth content; the cerium content in bastnaesite accounts for about 50% of the total rare earth content. Therefore, when processing these minerals and performing single rare earth separation, generally a large amount of cerium must be separated first. Cerium is a variable element. The biggest feature of cerium is that it is easily oxidized to positive tetravalent, and Ce 4+ Ion can be with F - Ion forming complex [CeF x ] 4-x The form is stable in sulfuric acid solution. Using the variable valence properties of cerium, cerium can be effectively separated from rare earth hydroxides. [0003] The existing wet air oxidation method of cerium in rare earth hydroxide is a method of separating ce...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/44
CPCC22B3/44C22B59/00Y02P10/20
Inventor 陈继邹丹李德谦刘郁崔红敏
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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