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Recovery method of rare earth oxalate precipitation wastewater

A recovery method and rare earth technology are applied in the recovery field of oxalate rare earth precipitation wastewater, which can solve the problems of increased solubility of rare earth oxalate and unusable wastewater.

Active Publication Date: 2013-11-27
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the rare earth industry, it is generally believed that oxalic acid rare earth precipitation wastewater contains oxalate, and the wastewater is easy to precipitate with rare earths, making the wastewater unusable
However, people often overlook that the solubility of rare earth oxalate increases sharply as the acidity of the solution increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The precipitation waste water of oxalic acid precipitation europium, the concentration of europium ion of this solution is 45mg / L, H + Concentration is 1.82mol / L, C 2 o 4 2- The concentration is 30g / L; In above-mentioned waste water 100L, adding concentration is the industrial concentrated hydrochloric acid 122L of 30%wt and 78L water and is mixed with H + The concentration is 5.5mol / L, C 2 o 4 2- A solution with a concentration of 10g / L; used for stripping the rare earths in the loaded rare earth extraction solution in the separation process of divalent europium and other trivalent rare earths.

Embodiment 2

[0012] Terbium oxalate precipitation waste water, the terbium ion concentration of this solution is 75mg / L, H + Concentration is 1.95mol / L, C 2 o 4 2- The concentration is 15g / L; Add the dilute hydrochloric acid 512L that concentration is 15%wt in above-mentioned waste water 100L; Prepare C 2 o 4 2- The concentration is 2.45g / L, H + A solution with a concentration of 4.5mol / L is used for stripping the rare earths in the loaded rare earth extraction solution in the pure terbium separation process.

Embodiment 3

[0014] Yttrium oxalate precipitation waste water, the yttrium ion concentration of this solution is 75mg / L, H + Concentration is 1.51mol / L, C 2 o 4 2- The concentration is 20g / L; Add the dilute hydrochloric acid 400L that concentration is 10%wt in above-mentioned waste water 100L, be mixed with H + The concentration is 3.5mol / L, C 2 o 4 2- The solution whose concentration is reduced to 4g / L is used for stripping the rare earth in the loaded rare earth extraction solution in the separation process of pure yttrium.

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Abstract

The invention relates to a recovery method of rare earth oxalate precipitation wastewater. The method is characterized in that the rare earth oxalate precipitation wastewater and hydrochloric acid are prepared into a solution, wherein the concentration of oxalate is 0.01-10g / L, and the concentration of H<+> is 3.5-6mol / L. According to the method provided in the invention, the rare earth oxalate precipitation wastewater and hydrochloric acid are prepared into a solution for back extraction of rare earth from a rare earth loaded extraction solution. Therefore, the wastewater discharge problem is solved, and the acid needed by back extraction of rare earth and the oxalic acid required by final rare earth precipitation can also be saved.

Description

technical field [0001] The invention relates to a recovery method of oxalic acid rare earth precipitation wastewater. Background technique [0002] Since the mid-1980s, my country's rare earth industry has developed rapidly and made great achievements. However, rare earth smelting belongs to wet smelting, and the amount of wastewater is relatively large, and the wastewater has the characteristics of serious pollution and difficult treatment. Rare earth smelting will bring about major environmental problems. [0003] Rare earth production mainly includes processes such as dissolution, extraction, stripping, and precipitation. The dissolution process mainly involves dissolving oxidized rare earths or rare earth carbonates into rare earth chlorides with hydrochloric acid. The extraction process is to use the difference in extraction performance between the extractant and the rare earth elements to extract the easy-to-extract rare earth into the extractant to form an extractant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26C22B59/00
Inventor 刘志强邱显扬朱薇郭秋松
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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