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Yourong-extraction, impurity removal and enrichment method for recovery of low-content rare earth waste residue

A rare earth waste slag and low content technology, applied in the direction of improving process efficiency, can solve the problems of high recycling cost, secondary pollution, waste of rare earth resources, etc., and achieve great economic and social benefits, reduce waste, and reduce costs.

Inactive Publication Date: 2017-03-08
LONGNAN COUNTY NANYU RARE EARTH RESOURCES COMPREHENSIVE UTILIZATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process will lose more rare earths in the dissolution of slag and pretreatment and impurity removal, so that the recovery rate of rare earths is low, generally not more than 70%, and because of the complicated process, precipitation, burning, etc. are required, which makes the recovery cost high
Some lime neutralization slags containing low valence elements in rare earth smelting and separation treatment waste water are difficult to recycle due to the high cost of recycling. They are treated as general solid waste or disposed of randomly, wasting the rare earth resources and causing secondary pollution. , which requires the development of a new rare earth recovery process with simple, high recovery rate and low cost, so that precious rare earth elements can be recovered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 (removal of impurities in rare earth mines), taking 2000g of removal of impurities in rare earth mines and recovering rare earths by the process of extracting and removing impurities and enriching rare earths as an example:

[0016] The specific steps are:

[0017] 1. Determine the rare earth content in the rare earth waste residue: Weigh 2000g of the drained soil mining pretreatment slag, the total amount of rare earth material measured is 2.0%, and the amount of rare earth metal in the 2000g waste residue is calculated to be 40g;

[0018] 2. Sizing: According to the ratio of rare earth waste residue (weight): water (weight) 1:1, add rare earth waste residue and water into a beaker or other container, stir and set into a slurry to form 4000g slurry;

[0019] 3. Excellent solubility: slowly add 10M industrial hydrochloric acid to the slurry, stir while adding, and perform a slow dissolution reaction, control the pH of the slurry to be 2.0-3.5, and the reaction time is ...

Embodiment 2

[0027] Example 2 (Lime neutralization of rare earth wastewater and waste residue), taking 5000g of rare earth wastewater and lime neutralization of waste residue, and recovering rare earth by the process of extracting and removing impurities and enriching rare earth as an example:

[0028] Specific steps are as follows:

[0029] 1. Determine the rare earth content in the rare earth waste residue: weigh 5000g of the drained rare earth waste water and lime neutralize the waste residue. The total amount of rare earth material measured is 1.5%, and the amount of rare earth metal in the 5000g waste residue is calculated to be 75g;

[0030] 2. Sizing: According to the ratio of rare earth waste residue (weight): water (weight) 1:1, add rare earth waste residue and water in a beaker or other container, stir and set into a slurry to form 10000g slurry;

[0031] 3. Excellent solubility: slowly add 10M industrial hydrochloric acid to the slurry, stir while adding, and perform a slow dissolution r...

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Abstract

The invention relates to a process for recovering rare earth waste with a low rare earth content through an optimum solubilizing-extraction edulcoration enrichment method. The process comprises the following steps of detecting the rare earth content in the rare earth waste, mixing slurry, optimum solubilizing, primary ageing, filtering or filter pressing, secondary ageing, removing non-rare earth impurities through N235 extraction, repeatedly extracting and enriching through P507 and reversely extracting rare earth in an organic phase for rare earth dredging. According to the process for recovering rare earth from the rare earth waste with a low content through optimum solubilizing-extraction edulcoration enrichment, low-cost and high-yield rare earth waste recovery and treatment is realized; and the valuable rare earth resource is recovered and waste is reduced, so that the process is a process with great economic and social benefits.

Description

Technical field [0001] The invention relates to a process for recovering low-content rare earth waste slag by an excellent dissolution-extraction impurity removal enrichment method. Background technique [0002] In the production of ionic rare earths in the extraction of rare earths in mining and rare earth smelting and separation, due to the removal of non-rare earth impurities and the neutralization of waste water with lime, many waste residues containing trace rare earths will be produced. These waste residues contain high non-rare earth impurities. , Such as SO 4 2- , Ca 2+ , Mg 2+ , Fe(OH) 3 , Al(OH) 3 , Carbonates, heavy metal hydroxides, etc., make it difficult to recover the rare earths in the slag, and the recovery cost is high. Any discharge will pollute the environment and waste resources. The traditional recycling process is: dissolve the waste residue with sulfuric acid, then filter, and adjust the pH of the filtrate to 4.8-5.4 to remove impurities. 3+ , Al 3+ Metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/26C22B7/04
CPCY02P10/20
Inventor 许瑞高钟化云赖小鹏徐荣敏钟勇
Owner LONGNAN COUNTY NANYU RARE EARTH RESOURCES COMPREHENSIVE UTILIZATION CO LTD