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A simple method for pretreatment-acid leaching of NdFeB waste

A NdFeB and acid leaching technology, which is applied in the field of comprehensive utilization of waste resources, can solve the problems of high operating intensity, low actual conversion rate, and reduced production effect, and achieve the effect of improving oxidation efficiency

Active Publication Date: 2017-07-18
LIANYUNGANG ZHAOYU NEW MATERIAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The production environment of ball milling and oxidation roasting is low, the power consumption is large, and there is serious dust phenomenon;
[0006] (2) After one grinding and one roasting, the actual conversion rate of Fe element into trivalent Fe is often not high, and the acid leaching solution has a higher Fe 2+ content, it is still necessary to re-adjust the pH of the leach solution before adding an excessive amount of chemical oxidant; 3+ , the effect is often unsatisfactory;
[0007] (3) Since the pH value of the acid leaching system changes and repeats for many times, in actual production, the residual value of rare earth elements in the filtered iron slag will be high, and it is necessary to elute and recover the iron slag for many times; In the case of a large number of times, the concentration of the extraction material will drop greatly, reduce the production effect, and eventually produce a large amount of process wastewater;
[0008] (4) The entire waste pre-disposal-acid leaching process has a long operating period, high operating intensity, and a large amount of equipment occupation, and requires additional consumption of acid, alkali, chemical oxidants, and washing water, increasing waste production

Method used

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  • A simple method for pretreatment-acid leaching of NdFeB waste
  • A simple method for pretreatment-acid leaching of NdFeB waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take a batch of NdFeB waste mainly from the machining of magnetic materials, and its solid content is 95%.

[0044] After testing, based on 1Kg of solids, there are 960.5g of NdFeB alloy in the waste, 20.3g of various oxides and compounds, and 19.2g of obvious physical impurities; the composition of NdFeB alloy is Nd 32.80 Fe 66.10 B 1.1 .

[0045] (1) Take a batch of NdFeB waste (as above, 1000Kg after folding and solidification), and separate the obvious impurities by physical separation.

[0046] (2) Put the above-mentioned NdFeB waste into the hydrogenation basket, place it in a hydrogenation device without a dehydrogenation unit, and put it at room temperature, H 2 Press 4×10 5 Under the condition of Pa, hydrogen is introduced, and after the hydrogenation amount reaches more than 380g, it enters the rapid hydrogen absorption stage, and the waste material rapidly bursts and breaks during the hydrogenation process, and the damage is further accelerated in the rap...

Embodiment 2

[0053] Take a batch of NdFeB waste, mainly from the scraps produced in the machining of magnetic materials and the grinding mud produced in the grinding process, with a solid content of 92%.

[0054] After testing, based on 1Kg of solids, there are 919.9g of NdFeB alloy in the waste, 49.8g of oxides and compounds, and 30.3g of obvious physical impurities; the composition of NdFeB alloy is Nd 32.73 Fe 66.17 B 1.1 .

[0055] (1) Take a batch of NdFeB waste (as above, 1000Kg after folding and solidification), and separate the obvious impurities by physical separation.

[0056] (2) Put the above-mentioned NdFeB waste into the hydrogenation basket, place it in a hydrogenation device without a dehydrogenation unit, and put it at room temperature, H 2 Press 3×10 5 Under the condition of Pa, hydrogen is introduced, and after the hydrogenation amount reaches more than 360g, it enters the rapid hydrogen absorption stage, and the waste material rapidly bursts and breaks during the hy...

Embodiment 3

[0063] A batch of NdFeB waste was taken, mainly from the scraps produced in the machining of magnetic materials, the grinding mud produced in the grinding process and the waste slag produced in the smelting process, with a solid content of 91%.

[0064] After testing, calculated by 1Kg solid amount, 927.4g of NdFeB alloy, 50.2g of oxide and compound total amount, 22.4g of obvious physical impurities in the waste material; wherein the composition of NdFeB alloy is (Dy 3 Gd 1 Nd 96 ) 32.73 Fe 66.17 B 1.1 .

[0065] (1) Take a batch of NdFeB waste (as above, 1000Kg after folding and solidification), and separate the obvious impurities by physical separation.

[0066] (2) Put the above-mentioned NdFeB waste into the hydrogenation basket, place it in a hydrogen crushing furnace with a dehydrogenation unit, and put it at room temperature, H 2 Press 4×10 5 Under the condition of Pa, hydrogen is introduced, and after the hydrogenation amount reaches more than 370g, it enters th...

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Abstract

The invention discloses a simplified method for pretreatment-acid leaching of a neodymium iron boron waste material, the waste material is pulverized by automatically triggered alloy expand and burst in the waste material under the condition of hydrogenation of the neodymium iron boron waste material by use of hydrogen absorption and hydrogen decrepitation characteristics of neodymium iron boron intermetallic compounds; then the waste material is supplied with oxygen for roasting under the condition of complete no dehydrogenation and incomplete dehydrogenation, the waste material is further broken into fine powder, and by common effects of other many favorable factors, Fe element in the waste material can be fully transformed very simply into ferric iron. Based on the pretreatment process, on the one hand, acid leaching optimal solution selectivity can be significantly improved, on the other hand, due to a high degree of pulverization of the waste material, a large number of micro cracks exist in the alloy, and the acid leaching time can be greatly shortened. The method has simple technological process, mild process conditions, high resource and energy efficiency, clean production properties, and other characteristics.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste resources, relates to rare earth resource recovery and utilization technology, and in particular to a simplified method for pretreatment-acid leaching of NdFeB waste. Background technique [0002] At present, domestic NdFeB waste recycling mainly adopts hydrometallurgy process, and various process technologies based on hydrometallurgy have been continuously improving. The published process reports mainly include sulfuric acid double salt precipitation method, fluoride precipitation method, Hydrochloric acid excellent solution-oxalic acid precipitation method, hydrochloric acid excellent solution-extraction method and so on. Among them, the hydrochloric acid optimal solution method is a process technology route widely used in China at present, mainly including three links such as waste pretreatment-acid leaching, extraction and separation based on leachate, and post-treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 梁浩梁健
Owner LIANYUNGANG ZHAOYU NEW MATERIAL IND
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