Recycling method of samarium cobalt magnetic waste material

A waste, samarium cobalt technology, applied in chemical instruments and methods, process efficiency improvement, cobalt oxide/cobalt hydroxide and other directions, can solve the problems of low purity of oxide products, low sulfuric acid leaching rate, etc., to achieve low production cost, The effect of high extraction and simple process

Inactive Publication Date: 2014-02-05
NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also the problem of low sulfuric acid leaching rate in the process, and a large amount of oxidant sodium persulfate is added, and the purity of the obtained oxide product is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 20g of samarium-cobalt waste and dissolve it with 200ml of 2.5M dilute hydrochloric acid. After the reaction is complete at 80°C, filter out the acid-insoluble matter. After adjusting the pH of the leaching solution to 2, slowly add a saturated solution made of 11g oxalic acid, and after the reaction is complete at 60°C, filter to obtain a rare earth oxalic acid precipitate.

[0023] After adjusting the pH of the filtrate, add 9.4ml of hydrogen peroxide to keep the pH = 4 so that the iron element in the solution will form a precipitate before the cobalt element, and the iron content in the solution will be reduced to below 0.10g / l, and the iron hydroxide precipitate will be removed by filtration. The cobalt filtrate after iron removal was adjusted to pH=4, and 18.8g of solid oxalic acid was added to react at 60°C to form a cobalt oxalate precipitate.

[0024] Precipitated rare earth oxalate and cobalt oxalate were dried and burned at 850°C for 2 hours to obtain rar...

Embodiment 2

[0026] Take 10g of samarium cobalt waste material and dissolve it with 100ml of 3.0M dilute hydrochloric acid at 80°C. After filtering the leaching solution, adjust the pH to 2, slowly add 5.5g of solid oxalic acid, and after the reaction is complete at 60°C, filter to obtain a rare earth oxalic acid precipitate.

[0027] After adjusting the pH of the filtrate, add 4.7ml of hydrogen peroxide to keep the pH = 4 so that the iron element in the solution will form a precipitate, which will be removed by filtration. The cobalt filtrate after iron removal was adjusted to pH=4, and 9.4g of solid oxalic acid was added to react at 60°C to form a cobalt oxalate precipitate.

[0028] Precipitated rare earth oxalate and cobalt oxalate were dried and burned at 800°C for 2 hours to obtain rare earth oxide (samarium oxide) and cobalt oxide.

Embodiment 3

[0030] Take 37g of samarium-cobalt waste material and dissolve it with 370ml of 2.5M dilute hydrochloric acid at 80°C. After filtering the leachate, adjust the pH to 2, slowly add a saturated solution made of 22g oxalic acid, and filter after the reaction is complete at 60°C to obtain a rare earth oxalic acid precipitate.

[0031] After adjusting the pH of the filtrate, add excess hydrogen peroxide to keep the pH = 4 so that the iron element in the solution will form a precipitate, which will be removed by filtration. Adjust the pH of the cobalt filtrate after iron removal to 4, add 23g of solid oxalic acid, and react at 60°C to form a cobalt oxalate precipitate.

[0032] Precipitated rare earth oxalate and cobalt oxalate were dried and burned at 850°C for 2 hours to obtain rare earth oxide (samarium oxide) and cobalt oxide.

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Abstract

The invention relates to a recycling method of a samarium cobalt magnetic waste material. The method is characterized by comprising the steps of: a, leaching a samarium cobalt waste material with dilute hydrochloric acid, and after the complete reaction, filtering to remove substances insoluble in acid; b, regulating pH of a leaching solution, precipitating rare earth elements in the solution with oxalic acid to generate a grey and white oxalate precipitate, filtering, drying and calcining the precipitate to obtain solid samarium oxide; c, precipitating samarium, oxidizing Fe<2+> into Fe<3+> in a filtrate by an oxidant, regulating the pH value to precipitate iron in the solution before cobalt, and filtering; and d, removing iron, adjusting the pH value of filtrate, adding oxalic acid to obtain a cobalt oxalate precipitate, and conducting filtration, drying and calcination to obtain cobalt oxide. The method has the following advantages: hydrochloric acid optimal solution, oxalic acid precipitation, iron removal by oxidation and calcination method are employed according to the chemical properties of the elements contained in the waste material, so as to successfully extract valuable elements in the samarium cobalt in waste material; the recycling process is simple in process and low in production cost and the does not produce secondary pollution of the environment; and the prepared samarium oxide and cobalt oxide products have high extraction rate.

Description

technical field [0001] The invention relates to a method for recycling samarium-cobalt magnetic waste, that is, recovering valuable elements in the samarium-cobalt magnetic waste to finally obtain samarium oxide and cobalt oxide products. It belongs to the field of hydrometallurgy. Background technique [0002] With the continuous expansion of the application range of magnetic materials, many permanent magnet materials with excellent performance have been developed. Rare earth cobalt alloys in rare earth permanent magnet alloys can be divided into two categories, the composition of which is about RECo 5 , another class about RE 2 co 17 . The raw material used in the present invention is samarium cobalt permanent magnet material, usually RECo 5 express. In the production process of samarium cobalt permanent magnet materials, from the pretreatment of raw materials to the final product inspection, each process inevitably produces waste or waste products, mainly including...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B59/00C01F17/00C01G51/04
CPCY02P10/20
Inventor 王晶晶许涛马莹张弓王东杰
Owner NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS
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