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Method for recovering tantalum, silver and manganese in waste and old tantalum capacitor

A tantalum capacitor and waste technology, applied in the field of resource recovery and environmental protection, can solve the problems of unfavorable environmental protection, waste of resources, not conforming to the general trend of energy saving and environmental protection, etc., and achieves simple and practical process steps, low cost, and resources. The effect of recycling and environmental protection

Active Publication Date: 2013-07-10
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the existing methods for recycling precious metals in tantalum capacitors first crush waste tantalum capacitors, and then recycle single metals. There is still a lack of comprehensive recycling of metals in tantalum capacitors, such as tantalum, manganese and silver, and there are still resources The waste is not conducive to environmental protection, and does not conform to the current general trend of energy conservation and environmental protection

Method used

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  • Method for recovering tantalum, silver and manganese in waste and old tantalum capacitor

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Effect test

Embodiment 1

[0029] The method for reclaiming tantalum, silver and manganese in the waste tantalum capacitor described in the application of the present invention comprises the following steps:

[0030] 1. Crushing: Use a ball mill to mechanically crush waste tantalum capacitors to obtain materials with an average particle size of 0.1-0.01 mm;

[0031] 2. Separation of metals and non-metals: the crushed materials are separated by magnetic separation to obtain metal materials;

[0032] 3. Manganese leaching: Add pure water and sulfuric acid to the separated metal material according to the ratio of solid to liquid mass ratio of 1:2, so that the H in the solution + The concentration is between 0.5~1.5 mol / L, and sodium sulfite is added at the same time. The quality of sodium sulfite is 0.5 times the mass of the material, and it is reacted at 60°C for 3 hours. The reaction solution is filtered to obtain a manganese-containing solution, and a pure manganese-containing solution is obtained throu...

Embodiment 2

[0036] The method for reclaiming tantalum, silver and manganese in the waste tantalum capacitor described in the application of the present invention comprises the following steps:

[0037] 1. Crushing: Mechanically crush waste tantalum capacitors using a jaw crusher, and the final average particle size of the crushed materials is between 0.1 and 0.01 mm;

[0038] 2. Separation of metals and non-metals: separate the metals and non-metals in the pulverized materials by electrostatic separation to obtain metal materials;

[0039]3. Manganese leaching: add pure water and hydrochloric acid to the separated metal material according to the ratio of solid to liquid mass ratio of 1:5, so that the H in the solution + Concentration is between 0.5~1.5 mol / L, add reducing agent sulfur dioxide at the same time, the quality of reducing agent is 1.5 times of the material quality, react at 99 ℃ for 1 hour, the reaction solution is filtered to obtain manganese-containing solution, after extrac...

Embodiment 3

[0043] The method for reclaiming tantalum, silver and manganese in the waste tantalum capacitor described in the application of the present invention comprises the following steps:

[0044] 1. Crushing: Mechanically crush waste tantalum capacitors with a ball mill, and the final average particle size of the crushed materials is between 0.1 and 0.01 mm;

[0045] 2. Separation of metals and non-metals: separate the metals and non-metals in the pulverized materials by hydrocyclone separation to obtain metal materials;

[0046] 3. Manganese leaching: Add pure water and nitric acid to the separated metal material according to the ratio of solid to liquid mass ratio of 1:3, so that the H in the solution + The concentration is between 1.0 mol / L, and the reducing agent hydrogen sulfide is added at the same time. The mass of the reducing agent is 1.0 times the mass of the material, and react at 75 °C for 2 hours. The reaction solution is filtered to obtain a manganese-containing soluti...

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Abstract

The invention provides a method for comprehensively recovering a plurality of metals in a tantalum capacitor. The method comprises the following steps: mechanically crushing the waste and old tantalum capacitor, separating metals from nonmetals to obtain metal materials, carrying out reduction acid dipping of the metal materials, filtering to obtain a manganese-containing solution, and carrying out extraction and impurity removal to obtain a manganese salt; and mixing filter residues obtained after the reduction acid dipping and filtration with carbon black and a chlorine salt, carrying out high temperature roasting in a chlorinator for reacting to generate tantalum chloride, arranging a condensation system at the upper portion of the chlorinator to condensate and recover tantalum chloride, rectifying the obtained tantalum chloride solid to obtain high-purity tantalum chloride, reducing the tantalum chloride to obtain high-purity tantalum powder, washing unreacted residues obtained after the roasting with hot water, adding ammonia water, filtering to obtain a silver-ammonia solution, and adding a reducing agent for reducing to obtain silver powder. The method has simple and practical steps, and is helpful for the resource recovery and the environmental protection.

Description

technical field [0001] The application of the present invention relates to a method for recovering metal tantalum, silver and manganese from waste tantalum capacitors, which belongs to the technical field of resource recovery and environmental protection. Background technique [0002] The full name of tantalum capacitor is tantalum electrolytic capacitor, which is also a kind of electrolytic capacitor. Tantalum capacitor is processed from rare metal tantalum. First, tantalum is ground into fine powder, and then sintered together with other media. Due to the inherent nature of metal tantalum, tantalum capacitors have the characteristics of good stability and do not change with changes in the environment. They can achieve a large capacitance and have incomparable characteristics with ceramic capacitors. Therefore, in many circuits where ceramic capacitors cannot be used, Tantalum capacitors are widely used. [0003] The annual production of tantalum capacitors exceeds 30 bill...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B47/00C22B34/24
CPCY02P10/20
Inventor 王勤曾念谭翠丽陈艳红
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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