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

A tantalum capacitor and waste technology, which is applied in metallurgical engineering, chemical engineering and industrial solid waste resource utilization, can solve the problems of complex and lengthy process flow, high separation cost, failure to recycle, etc., and achieve high purity and low energy consumption , Inhibit the effect of halogenated volatilization

Active Publication Date: 2022-02-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Publication No. CN102560127A Chinese Patent Document "Method for Preparing Ultra-fine Tantalum Carbide from Tantalum Capacitor Scraps" uses various types of tantalum capacitor scraps (especially resin-encapsulated tantalum capacitor scraps) through shelling, sorting, pickling After processes such as , drying, oxidation, ball milling, primary carbonization and secondary carbonization, ultrafine tantalum carbide is prepared, and silver is recovered in the solution after pickling. The process flow of this method is complicated and lengthy, and the separation cost is high. There is acidic wastewater, and metals such as iron and nickel cannot be recovered at the same time

Method used

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

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Embodiment 1

[0037] A method for reclaiming tantalum, nickel and silver in the waste tantalum capacitor of the present invention, the technological process is as follows figure 1 shown, including the following steps:

[0038] (1) A waste tantalum capacitor provided by a domestic waste electronics recycling company. It is a black chip tantalum capacitor with a withstand voltage of 4V and a capacitance of 1000μF produced by NEC TOKIN. The individual mass is 0.36g and the outer size is 7×4× 3mm. Take 485.64g of the above waste tantalum capacitors, freeze them in 1.46L liquid nitrogen for 10min, take them out, crush them, and sieve them to obtain 441.81g of under-sieve tantalum-rich powder and 40.57g of over-sieve materials respectively.

[0039] (2) The oversize was separated by magnetic separation to obtain 33.37 g of iron-nickel alloy and 7.20 g of tantalum lead wire. The composition of the tantalum-rich powder obtained above is (wt.%): Ta 43.68, Fe 0.25, Ni 0.54, Ag 2.98, SiO 2 22.50, ...

Embodiment 2

[0048] A method for reclaiming tantalum, nickel and silver in the waste tantalum capacitor of the present invention, the technological process is as follows figure 1 shown, including the following steps:

[0049] (1) A waste tantalum capacitor provided by a domestic waste electronics recycling company. It is a black chip tantalum capacitor with a withstand voltage of 4V and a capacitance of 1000μF produced by NEC TOKIN. The individual mass is 0.36g and the outer size is 7×4× 3mm. Take 485.64g of the above waste tantalum capacitors, freeze them in 1.46L liquid nitrogen for 10min, take them out, crush them, and sieve them to obtain 441.81g of under-sieve tantalum-rich powder and 40.57g of over-sieve materials respectively.

[0050] (2) The oversize was separated by magnetic separation to obtain 33.37 g of iron-nickel alloy and 7.20 g of tantalum lead wire. The composition of the tantalum-rich powder obtained above is (wt.%): Ta 43.68, Fe 0.25, Ni 0.54, Ag 2.98, SiO 2 22.50, ...

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Abstract

The invention discloses a method for recovering tantalum, nickel and silver from a waste tantalum capacitor, which comprises the following steps of (1) crushing and screening the waste tantalum capacitor to obtain oversize products and tantalum-rich undersize products, (2) performing magnetic separation on the oversize product to obtain an iron-nickel alloy and a tantalum lead, (3) mixing the tantalum-rich undersize products with inorganic alkali, roasting, leaching and filtering to obtain a leaching solution containing silicate and leaching residues, (4) mixing the leaching residues with an acid solution, carrying out acid leaching to obtain an acid leaching solution containing Ag, Fe and Ni and tantalic acid-rich leaching residues, and washing and drying the tantalic acid-rich leaching residues to obtain a tantalum product, and enabling the tantalum lead to be subjected to acid leaching and filtering to obtain a pure tantalum wire. The method has the advantages of being low in energy consumption, high in metal recovery rate, low in cost, simple in process, simple in material and the like, tantalum metal and valuable metal in the waste tantalum capacitor can be efficiently separated and recovered, and the method has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical fields of metallurgical engineering, chemical engineering and industrial solid waste resource utilization, and in particular relates to a method for recovering tantalum, nickel and silver from waste tantalum capacitors. Background technique [0002] The proportion of secondary resources in metal smelting raw materials is increasing day by day. Tantalum capacitors are rich in valuable metals such as tantalum, silver, iron, nickel, etc., and are a kind of valuable tantalum raw materials. Although this type of material does not have the problem of separating tantalum and niobium, the structure of tantalum capacitors is precise, and the components are embedded in each other, making it difficult to handle. The safe, green crushing and efficient separation of valuable components of tantalum capacitors are the core issues of their recycling. Existing recycling methods for tantalum capacitors have many problems. For exam...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B1/00C22B11/02C22B11/00C22B23/02C22B23/00C22B34/24C01B33/32B02C19/18
CPCC22B7/001C22B7/007C22B34/24C22B1/02C22B11/046C22B11/025C22B7/005C22B23/02C22B23/0438C22B1/005C01B33/32B02C19/186Y02P10/20
Inventor 夏隆巩刘志宏魏雪叶逢春
Owner CENT SOUTH UNIV
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