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A pretreatment method for recycling and reusing NdFeB waste with tape oil sludge

A technology of waste recycling and neodymium iron boron, applied in the direction of cleaning methods using liquids, grain processing, cleaning methods and appliances, etc., can solve problems such as complex devices, pollution, and deterioration of the working environment, and achieve the effect of reducing crushing and oxidation, and cleaning Obvious, guaranteed grinding effect

Active Publication Date: 2022-02-01
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN104190943A discloses a method for recycling sintered NdFeB waste materials. First, the waste materials are classified and collected, and white corundum abrasives and metal cleaning liquid are added to the waste materials for vibration and polishing cleaning, and then a short process is used. However, the patent selects The waste is unqualified products and leftovers produced by post-processing. Generally, the surface only contains a small amount of oil sludge and scale, and it cannot handle the material head with more glue and scale; patent CN108435676A discloses a sintered NdFeB The degumming equipment and method, place the waste in a specific roller device, add a degumming liquid into the device, and remove the colloid on the surface of the waste at high temperature. Although this patent can remove the colloid on the surface of the waste, the device is relatively complicated and the cost is high. And high temperature treatment will not only cause damage to the magnet itself, but also deteriorate the working environment and cause pollution; patent CN109003798A discloses a method for recycling sintered NdFeB mixed waste, adding degreaser and water to the mixed waste for stirring Treatment, remove oil and mud, and dry in an inert atmosphere, then grind and magnetically separate, and then prepare bonded magnets. This method has low requirements for waste, and most waste materials are applicable, but the waste after treatment by this method The overall quality is not high, the performance is low, it is only used for the production of bonded magnets, and the waste is not maximized

Method used

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  • A pretreatment method for recycling and reusing NdFeB waste with tape oil sludge
  • A pretreatment method for recycling and reusing NdFeB waste with tape oil sludge
  • A pretreatment method for recycling and reusing NdFeB waste with tape oil sludge

Examples

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Embodiment 1

[0070] 1) Prepare 100 parts of surface cleaning solution, the ingredients are: 1 part of sodium carbonate and 2 parts of sodium bicarbonate, the pH value is adjusted to 8.5, 5 parts of alkylphenol polyoxyethylene ether OP-10, 12 parts of ethylene glycol butyl ether acetate ester, 8 parts of N,N-dimethylacetamide, 8 parts of isoamyl acetate, and the balance is deionized water.

[0071] 2) Put the cylindrical oil sludge leather head with tape with a thickness of 5-8mm into the vibrating grinder, add grinding balls according to the ratio of waste material to grinding ball mass ratio 1.5:1, the composition is 50wt.% brown corundum, 40wt.% ceramic grinding balls and 10wt.% plastic grinding balls, and the size distribution of each grinding ball is: the diameter of 50wt.% of the grinding balls satisfies: 10mm≥diameter>7mm, and the diameter of 20wt.% of the grinding balls satisfies: 2mm≤diameter<5mm, the diameter of the remaining 30wt.% grinding balls is 5-7mm; then put in the prepare...

Embodiment 2

[0108] Compared with Example 1, the NdFeB waste material is a rectangular bonded head with a thickness of less than 3mm, and the grinding ball proportion is 30wt.% brown corundum, 40wt.% ceramic grinding balls and 30wt.% plastic grinding balls; each The size distribution of the grinding balls is: 20wt.% of the grinding balls satisfy 10mm≥diameter>7mm, 50wt.% of the grinding balls satisfy 2mm≤diameter<5mm, and the remaining 30wt.% of the grinding balls have a diameter of 5-7mm. All the other steps are the same as in Example 1.

[0109] According to embodiment 2, the contrast before and after treatment of waste material surface sees image 3 , image 3 b) is before treatment, B) is after treatment.

Embodiment 3

[0111] Compared with Example 1, the thickness of the NdFeB waste material is an annular binder head less than 3mm, and the grinding ball proportion is 30wt.% brown corundum, 40wt.% ceramic grinding balls and 30wt.% plastic grinding balls; The size distribution of the grinding balls is as follows: 20wt.% of the grinding balls satisfy 10mm≥diameter>7mm, 50wt.% of the grinding balls satisfy 2mm≤diameter<5mm, and the remaining 30wt.% of the grinding balls have a diameter of 5-7mm. All the other steps are the same as in Example 1.

[0112] According to embodiment 3, the contrast before and after treatment of waste material surface sees Figure 4 , Figure 4 Among them, c) is before treatment, and C) is after treatment.

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Abstract

The invention provides a pretreatment method for recycling and reusing NdFeB waste materials with tape oil sludge, belonging to the technical field of material recovery. The invention does not use high-temperature cooking and special equipment, and only uses surface cleaning liquid and grinding to remove sludge, colloid and scale on the surface of NdFeB waste with belt sludge. Good degradability, can be used at room temperature, and the cleaning effect is obvious; when pickling, use lower concentration of nitric acid, the acidity of dilute nitric acid is weak, and will not excessively corrode the neodymium-rich phase in the waste, resulting in waste of rare earth, sodium fluoride It can improve the activity of the surface of the waste material, reduce its oxidation, and make the surface of the treated waste material more clean and bright; the waste material treated by the above pretreatment method fully meets the requirements of the subsequent short-flow method for preparing high-performance regenerative magnets.

Description

technical field [0001] The invention relates to the technical field of material recovery, in particular to a pretreatment method for recycling and reusing NdFeB waste materials with belt oil sludge. Background technique [0002] NdFeB is the most widely used permanent magnet material, and its demand and output are increasing year by year. With the increasing shortage of rare earth resources and rising prices, it is imminent to recycle NdFeB waste. [0003] In recent years, short-process recycling technology, as a method with high resource recycling rate, energy saving and environmental protection, has been favored in the recycling process of NdFeB waste. Compared with traditional hydrometallurgy, the short-process recovery technology does not need to extract the waste into rare earth oxides, chlorides or rare earth elements through acid dissolution, alkali precipitation, roasting and other processes, but directly processes the collected waste through appropriate surface tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B3/35B09B5/00B02C17/10B02C17/20B08B3/12B08B3/08C23G1/14C23G1/02
CPCB09B3/00B09B5/00B02C17/10B02C17/20B08B3/12B08B3/08C23G1/14C23G1/02
Inventor 路清梅尹彦涛戚植奇岳明刘卫强张红国张东涛李玉卿吴琼喻玺庞再升
Owner BEIJING UNIV OF TECH