Method for recovering tantalum, silver, nickel and iron from waste tantalum capacitor

A tantalum capacitor and waste technology, which is applied in the field of resource recovery and environmental protection, can solve the problems of high corrosiveness and toxicity of chlorine gas, complicated process routes, and a large amount of waste acid and waste alkali solution, so as to achieve resource utilization and simple process , the effect of avoiding environmental pollution

Active Publication Date: 2016-10-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method realizes the recovery of tantalum in tantalum capacitors, but the process route is relatively complicated, and a large amount of waste acid and waste alkali solution will be produced during the r...

Method used

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  • Method for recovering tantalum, silver, nickel and iron from waste tantalum capacitor
  • Method for recovering tantalum, silver, nickel and iron from waste tantalum capacitor

Examples

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Embodiment 1

[0026] A method for reclaiming tantalum, silver, nickel and iron in waste tantalum capacitors, comprising the steps of:

[0027] 1. Mechanical crushing: Take 20g of resin-encapsulated waste tantalum capacitors with a tantalum content of 35.9%. The analysis results are as follows: Ta: 35.9%, Ag: 0.3%, Ni: 2.08%, Fe: 3.85%. The tantalum capacitor is crushed by a ball mill to obtain materials with an average particle size of 0.5-0.01mm;

[0028] 2. Electrostatically sort the crushed materials to separate metal and non-metal;

[0029] 3. Magnetically separate metal materials to separate nickel and iron; then sieve to obtain silver-containing tantalum-enriched powder;

[0030] 4. The tantalum-enriched powder is subjected to electron beam smelting to separate metallic silver through evaporation-condensation, and the power value corresponding to different temperatures is calculated according to the relationship between power and smelting temperature. Then the smelting power was con...

Embodiment 2

[0038] A method for reclaiming tantalum, silver, nickel and iron in waste tantalum capacitors, comprising the steps of:

[0039]1. Mechanical crushing: Take 20g of resin-encapsulated waste tantalum capacitors with a tantalum content of 35.9%. The analysis results are as follows: Ta: 35.9%, Ag: 0.3%, Ni: 2.08%, Fe: 3.85%. The tantalum capacitor is crushed with a hammer crusher to obtain materials with an average particle size of 0.5-0.01mm;

[0040] 2. The crushed material is subjected to hydrocyclone separation to separate metal and non-metal;

[0041] 3. Magnetically separate metal materials to separate nickel and iron; then sieve to obtain silver-containing tantalum-enriched powder;

[0042] 4. The tantalum-enriched powder is subjected to electron beam smelting, and metallic silver is separated by evaporation-condensation. According to the relationship between power and melting temperature, the power values ​​corresponding to different temperatures are calculated. Then th...

Embodiment 3

[0045] A method for reclaiming tantalum, silver, nickel and iron in waste tantalum capacitors, comprising the steps of:

[0046] 1. Mechanical crushing: Take 20g of resin-encapsulated waste tantalum capacitors with a tantalum content of 35.9%. The analysis results are as follows: Ta: 35.9%, Ag: 0.3%, Ni: 2.08%, Fe: 3.85%. The tantalum capacitor is crushed by a ball mill to obtain materials with an average particle size of 0.5-0.01mm;

[0047] 2. The crushed material is subjected to hydrocyclone separation to separate metal and non-metal;

[0048] 3. Magnetically separate metal materials to separate nickel and iron; then sieve to obtain silver-containing tantalum-enriched powder;

[0049] 4. The tantalum-enriched powder is subjected to electron beam smelting, and metallic silver is separated by evaporation-condensation. According to the relationship between power and melting temperature, the power values ​​corresponding to different temperatures are calculated. Then the smel...

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Abstract

The invention relates to a method for recovering tantalum, silver, nickel and iron from a waste tantalum capacitor. The method comprises the following steps: firstly, the waste tantalum capacitor is mechanically crushed, and metal and nonmetal are separated to obtain a metal material; then, the metal material is magnetically separated to separate out a nickel-iron magnetic material; then, a residue is screened to obtain silver-contained tantalum-enriched powder; then, the electronic beam smelting is performed for the tantalum-enriched powder, and metal silver is separated out through evaporation-condensation; and finally, a residual metal tantalum material (containing less tantalum oxide) is reduced to obtain high-purity metal tantalum. The method is simple, generates no poisonous gas and waste liquid in the whole process, prevents the environmental pollution caused by traditional thermometallurgy and hydrometallurgy, and realizes the resource utilization of the waste tantalum capacitor under environment-friendly condition.

Description

technical field [0001] The invention relates to a method for recovering tantalum, silver, nickel and iron from waste tantalum capacitors, and belongs to the technical field of resource recovery and environmental protection. Background technique [0002] Tantalum capacitors are called tantalum electrolytic capacitors, which use rare metal tantalum as the medium, and there is no electrolyte inside the capacitor, which is suitable for working at high temperatures. Because of its wide operating temperature range and excellent volume efficiency, it is widely used in electronic products. With the rapid growth of the number of electronic products, the global demand for tantalum capacitors increased from 10 billion in 2001 to 30 billion in 2013. The huge demand for tantalum capacitors has increased the consumption of metal tantalum. However, tantalum is a rare metal, and its content in the earth's crust is only 7 parts per million. At present, the world's annual production of tan...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/02C22B34/24B03C1/30
CPCB03C1/30C22B7/001C22B11/025C22B34/24
Inventor 许振明刘志国牛博
Owner SHANGHAI JIAO TONG UNIV
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