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A method for enriching eluate with low rare earth concentration by ion exchange method

An ion exchange method and eluate technology, applied in the direction of improving process efficiency, etc., can solve the problems of increasing the amount of complex wastewater treatment and discharge, affecting the recovery rate of rare earths, and high iron slag and rare earth residues, so as to reduce wastewater treatment Cost, production cost reduction, effect of increasing rare earth concentration

Inactive Publication Date: 2016-03-02
GUANGDONG ZHONGHE RARE REGENERATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Less water consumption and fewer washing times are prone to high rare earth residues in iron slag, which will affect the recovery rate of rare earths; large water consumption and more washing times will result in low concentration of extraction materials and reduced processing capacity, or low concentration rare earth liquids need to be precipitated with a precipitant Wastewater is generated, which increases the amount of wastewater treatment and discharge of complex components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method of enriching the eluate with low rare earth concentration by ion exchange method of the present invention comprises the following steps:

[0037] (1) Waste crushing: finely grind the NdFeB waste with REO content of 26.32% to 150 mesh;

[0038] (2) Add water to make slurry: Weigh 200 grams of finely ground NdFeB waste into the reactor, add 320ml of pure water to make slurry;

[0039] (3) Excellent solubility of hydrochloric acid: Slowly add 160ml of concentrated hydrochloric acid with a concentration of 30% under stirring conditions, heat to 90°C for 60 minutes; add 8g of sodium peroxide and continue the reaction for 20 minutes;

[0040](4) Filtration and separation: separate the rare earth feed liquid and primary iron slag, the primary iron slag is 151.7 grams, and the REO content in the iron slag is 2.98%;

[0041] (5) Iron slag washing: Return the primary iron slag to the reactor, add 300ml of 100°C water and stir for 45 minutes, filter to obtain the primary...

Embodiment 2

[0046] A method of enriching the eluate with low rare earth concentration by ion exchange method of the present invention comprises the following steps:

[0047] (1) Waste crushing: NdFeB waste is oxidized and finely ground to 200 mesh, and the content of REO in NdFeB waste is 21.21%;

[0048] (2) Add water to make slurry: Weigh 200g into the reactor, add 200ml of pure water to make slurry;

[0049] (3) Excellent solubility of hydrochloric acid: Slowly add 200ml of concentrated hydrochloric acid with a concentration of 30% under stirring conditions, heat to 100°C for 90 minutes; add 5g of sodium peroxide and continue the reaction for 30 minutes;

[0050] (4) Filtration and separation: separate the rare earth feed liquid and primary iron slag, the primary iron slag is 161.9 grams, and the REO content in the iron slag is 2.82%;

[0051] (5) Iron slag washing: return the iron slag to the reactor, add 300ml of water at 60°C and stir for 15 minutes, filter to obtain 285ml of the p...

Embodiment 3

[0057] A method of enriching the eluate with low rare earth concentration by ion exchange method of the present invention comprises the following steps:

[0058] (1) Waste crushing: NdFeB waste is oxidized and finely ground to 200 mesh, and the content of REO in NdFeB waste is 25.21%;

[0059] (2) Add water to make slurry: weigh 200 grams of NdFeB waste and add it to the reactor, add 285ml of washing water containing REO11.60g / l to make slurry;

[0060] (3) Excellent solubility of hydrochloric acid: Slowly add 60ml of 30% concentrated hydrochloric acid under stirring conditions, heat to 100°C for 60 minutes; add 10g of sodium ferrate and continue the reaction for 50 minutes;

[0061] (4) Filtration and separation: separate the feed liquid and the primary iron slag, the primary iron slag is 158.83 grams, and the iron slag contains REO2.76%;

[0062] (5) Iron slag washing: return the iron slag to the reactor, add 300ml of water at a temperature of 80°C and stir for 20 minutes, ...

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Abstract

The invention discloses a method for gathering eluate with low rare earth concentration by adopting an ionic exchange method, and belongs to the technical field of a neodymium iron boron material recovery technology. The technical main points are that the method comprises the following steps: (1) crushing scraps; (2) adding water for conditioning; (3) optimally dissolving by hydrochloric acid; (4) filtering and separating; (5) washing an iron cake; (6) ion exchange treatment; and (7) ion resin regeneration. The invention aims at providing the method for gathering the eluate with low rare earth concentration by adopting the ionic exchange method capable of reducing wastewater discharge and reducing the production cost. The method is used for concentrating rare earth elements in the eluate with low rare earth concentration in the neodymium iron boron waste recovery treatment process.

Description

technical field [0001] The invention relates to a method for recovering rare earth elements from NdFeB waste materials, more specifically, a method for enriching eluate with low rare earth concentration by ion exchange. Background technique [0002] Rare earth permanent magnet material is an important functional material, and NdFeB is the rare earth permanent magnet material with the best performance at present. It is called "Magnetic King" because of its excellent magnetic properties. NdFeB has extremely high magnetic energy product and coercive force, and the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that instruments, electroacoustic motors, magnetic separation Miniaturization, weight reduction, and thinning of equipment such as magnetization are possible. In the process of NdFeB magnetic material processing, scraps after cutting and grinding, waste slag after smelting, superfine po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B7/00C22B59/00
CPCY02P10/20
Inventor 杨健吴海明
Owner GUANGDONG ZHONGHE RARE REGENERATION TECH
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