Method for separating and utilizing neodymium iron boron waste materials

A technology of NdFeB waste, which is applied in the field of separation and utilization of NdFeB waste, can solve the problems of low recovery rate, high resource consumption, and impracticality, and achieve the goal of reducing separation and recovery costs, high economic benefits, and improving recovery rate Effect

Active Publication Date: 2014-05-07
绵竹三人禾科技发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: 1. High resource consumption and low recovery rate greatly increase the cost of separation and recovery, which is extremely impractical; 2. The quality of rare earth elements obtained by separation and recovery is low, and industrial reuse will affect the finished NdFeB The performance and quality of permanent magnet materials; 3. The separation and utilization measures are incomplete, only rare earth elements are separated and extracted, and other substances contained in NdFeB waste, such as metal compounds (i

Method used

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  • Method for separating and utilizing neodymium iron boron waste materials

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Experimental program
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Effect test

Embodiment 1

[0030] The present invention comprises the following sequential steps:

[0031] A. Hydrochloric acid dissolution: Add 20% hydrochloric acid to 1 ton of NdFeB waste (the total amount of rare earth is about 25%) for acid hydrolysis. The hydrochloric acid is obtained by diluting 32% industrial hydrochloric acid with deionized water. Hydrochloric acid The mass ratio to NdFeB waste is 2:1, the acid hydrolysis temperature is 95°C, and the acid hydrolysis time is 3 hours, so that the NdFeB waste is fully dissolved by hydrochloric acid, and the pH value at the end of the acid hydrolysis reaction is 2;

[0032] B. Primary solid-liquid separation: pass the solution in step A through a plate and frame filter press for solid-liquid separation to obtain about 150kg of primary filter residue (the total amount of rare earth is about 8%), and the primary filter residue is calcined at 450°C to fully oxidize the filter residue , to reduce the consumption of hydrochloric acid, after the high-t...

Embodiment 2

[0044] The present invention comprises the following sequential steps:

[0045] A. Hydrochloric acid dissolution: Add 20% hydrochloric acid to 1 ton of NdFeB waste (the total amount of rare earth is about 25%) for acid hydrolysis. The hydrochloric acid is obtained by diluting 32% industrial hydrochloric acid with deionized water. Hydrochloric acid The mass ratio to NdFeB waste is 2:1, the acid hydrolysis temperature is 100°C, and the acid hydrolysis time is 2.5 hours, so that the NdFeB waste is fully dissolved by hydrochloric acid, and the pH value at the end of the acid hydrolysis reaction is 1.8;

[0046] B. Primary solid-liquid separation: pass the solution in step A through a plate and frame filter press for solid-liquid separation to obtain a primary filter residue of about 150kg (the total amount of rare earth is about 8%), and the primary filter residue is calcined at 550°C to fully oxidize the filter residue , to reduce the consumption of hydrochloric acid, after the...

Embodiment 3

[0058] The present invention comprises the following sequential steps:

[0059] A. Hydrochloric acid dissolution: Add 23% hydrochloric acid to 1 ton of NdFeB waste (the total amount of rare earth is about 25%) for acid hydrolysis. The hydrochloric acid is obtained by diluting 32% industrial hydrochloric acid with deionized water. Hydrochloric acid The mass ratio to NdFeB waste is 2:1, the acid hydrolysis temperature is 105°C, and the acid hydrolysis time is 2.5 hours, so that the NdFeB waste is fully dissolved by hydrochloric acid, and the pH value at the end of the acid hydrolysis reaction is 1.6;

[0060] B. Primary solid-liquid separation: pass the solution in step A through a plate and frame filter press for solid-liquid separation to obtain a primary filter residue of about 150kg (the total amount of rare earth is about 8%), and the primary filter residue is calcined at a high temperature of 600°C to fully oxidize the filter residue , to reduce the consumption of hydroc...

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Abstract

The invention provides a method for separating and utilizing neodymium iron boron waste materials. The method comprises the following sequential steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid, secondary solid-liquid separation, hydrolysis process, third solid-liquid separation, acidic oxidation process, precipitation of ferric phosphate, fourth solid-liquid separation, evaporation and concentration, and fifth solid-liquid separation. Iron oxide red and praseodymium oxide are obtained through the steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid and secondary solid-liquid separation; iron oxide red and ferric phosphate precipitate are obtained through the steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid, secondary solid-liquid separation, hydrolysis process, third solid-liquid separation, acidic oxidation process, precipitation of ferric phosphate and fourth solid-liquid separation; ammonium chloride is obtained through the steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid, secondary solid-liquid separation, hydrolysis process, third solid-liquid separation, acidic oxidation process, precipitation of ferric phosphate, fourth solid-liquid separation, the evaporation and concentration and fifth solid-liquid separation. The method is high in recovery rate and purity, environment-friendly and pollution-free, low in recovery cost and the like.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of rare earth resources, in particular to a method for separating and utilizing NdFeB waste. Background technique [0002] NdFeB is an alloy of rare earth elements neodymium, praseodymium, praseodymium, etc. and iron oxide. It is a permanent magnet material with high remanence, high coercive force, and high magnetic energy product. It has been widely used in modern industry and electronic technology. . In the process of producing NdFeB permanent magnet components, due to the different shapes and sizes of various components, the blank NdFeB needs to be finely treated by cutting, cutting, grinding, etc. During this finishing process, processing will inevitably occur. Waste, according to statistics, NdFeB waste accounts for about 20% of the total billet, which is a huge amount of NdFeB waste for the huge demand for NdFeB. [0003] Since the composition of NdFeB waste is basically the sam...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/10C22B3/44C22B59/00C01G49/00
CPCY02P10/20
Inventor 杨斌
Owner 绵竹三人禾科技发展有限责任公司
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