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Method for treating sm-co alloy

A samarium cobalt and alloy technology, applied in the field of hydrometallurgical process, can solve the problems of high reagent cost and large production investment, and achieve the effects of reduced leaching rate, environmental friendliness and simple operation

Inactive Publication Date: 2015-09-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation of samarium and cobalt in the extraction method is generally more thorough, but there are problems such as high reagent cost and large production investment

Method used

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  • Method for treating sm-co alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition of the samarium-cobalt alloy is (%): Sm 31.71, Co 61.81. Analytical pure sulfuric acid, where H 2 SO 4 Content ≥ 98.0%; Analytical pure hydrochloric acid, of which HCl content ≥ 36.0%; Analytical pure sodium hydroxide, of which NaOH content ≥ 96.0%; Analytical pure sodium carbonate, of which Na 2 CO 3 Content ≥ 99.8%; industrial grade nitrogen, of which N 2 Content ≥ 99.5%; Analytical pure oxalic acid, of which H 2 C 2 o 4 2H 2 O≥99.5%.

[0018] Prepare 1 L of a solution with a sulfuric acid concentration of 4 mol / L, then add 200 g of samarium-cobalt alloy powder with a particle size of 0.074 mm into the solution, react at a temperature of 80°C for 2 hours, filter and wash, and obtain a samarium-containing leaching residue 140.02 g, its composition (%): Sm 38.74; combined washing water to obtain 1090 mL of cobalt-containing leachate, its composition (g / L): Sm 8.42, Co 113.02.

[0019] Sodium hydroxide was slowly added to the cobalt-containing le...

Embodiment 2

[0023] The composition of samarium-cobalt alloy is (%): Sm 35.62, Co 56.74. Analytical pure sulfuric acid, where H 2 SO 4 Content ≥ 98.0%; Analytical pure hydrochloric acid, of which HCl content ≥ 36.0%; Analytical pure sodium hydroxide, of which NaOH content ≥ 96.0%; Analytical pure sodium carbonate, of which Na 2 CO 3 Content ≥ 99.8%; industrial grade nitrogen, of which N 2 Content ≥ 99.5%; Analytical pure oxalic acid, of which H 2 C 2 o 4 2H 2 O≥99.5%.

[0024] Prepare 1L of a solution with a sulfuric acid concentration of 5.76mol / L, then add 200g of samarium-cobalt alloy powder with a particle size of 0.20mm into the solution, react at a temperature of 90°C for 2 hours, filter and wash, and obtain samarium-containing leaching residue 136.14g, its composition is (%): Sm 45.42; combined washing water to obtain 1085 mL of cobalt-containing leachate, its composition is (g / L): Sm 8.66, Co 104.25.

[0025] Sodium hydroxide was slowly added to the cobalt-containing leach...

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Abstract

The invention discloses a method for treating sm-co alloy. The method comprises the steps that the ground sm-co alloy is leached under a sulfuric acid system of 4-6 mol / L, the co and a little sm enter into a solution, and the co can be separated from most sm; the pH value of the sm entered into the solution is adjusted, the sm is mixed with the most sm stored in leaching residues, after being transformed through sodium carbonate, the sm is dissolved with hydrochloric acid and precipitated with oxalic acid, and a samarium oxide product is prepared by direct backing. According to the method, by controlling the concentration and temperature of sulfuric acid, the leaching rate of the sm is greatly reduced, the separation between the sm and co is achieved initially, and the subsequent sm sedimentation procedure is facilitated; sedimentation containing the sm and leaching residues containing the sm are transformed through the sodium carbonate, and the samarium sulphate and double salt of the samarium sulphate are prevented from being mixed, so that it is facilitated to reduce the temperature of subsequent baking and preparation of the samarium oxide; the oxidation of the co in the reaction process can be restrained through nitrogen atmosphere protection, so that it is guaranteed that over 99.5% co in the alloy does not oxidize,hydrolyze or enter into the sedimentation containing the sm.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a method for processing samarium-cobalt alloys. Background technique [0002] Samarium-cobalt alloy is a kind of rare earth material, which is widely used in electronics industry, medicine, national defense and other fields. In addition to samarium and cobalt, samarium-cobalt alloy may also contain a small amount of valuable metals such as nickel and copper. Since the reserves of samarium and cobalt in our country are small, they are scarce strategic resources, so it is of great practical significance to separate and recover samarium and cobalt from samarium-cobalt alloys. [0003] At present, the traditional treatment method of samarium-cobalt alloy is to leaching the finely ground samarium-cobalt alloy after oxidizing and roasting or using an acidic system for direct leaching. The acidic system used is usually a high-concentration sulfuric acid or hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B59/00
CPCY02P10/20
Inventor 张杜超王安张新望肖庆凯杨天足刘伟锋陈霖
Owner CENT SOUTH UNIV