Method for extracting nonferrous metal from waste circuit board

A technology of waste circuit boards and non-ferrous metals, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of environmental pollution and high cost, and achieve the effects of protecting the environment, reducing usage, and reducing recycling costs

Inactive Publication Date: 2018-02-23
宝鸡市铭坤有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for extracting nonferrous metals from waste circuit boards, which solves the problems of high cost and environmental pollution in the process of extracting nonferrous metals from waste circuit boards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Pretreatment of waste circuit boards

[0032] Put the waste circuit board into a shearing machine for preliminary shearing, and then put it into a grinder for crushing to obtain a fine-grained material with a particle size of 0.5 mm.

[0033] (2) Put the fine-grained material into deionized water, stir to make it fully dispersed in deionized water, and then send it to the shaker for gravity separation, and divide the material into heavy products and light products through shaker separation, remove Light products and heavy products are retained; the parameters of the shaker are: the transverse slope is 5°-10°, the stroke is 20-30mm, and the number of strokes is 300-400 times / min; the mass ratio of fine-grained materials to deionized water is 2:1 .

[0034] (3) Take the bituminous coal powder, sodium chloride and heavy products for heat treatment respectively. The heat treatment parameters are as follows: first heat to 200°C, hold for 0.5h; then heat to 800°C, hold f...

Embodiment 2

[0038] (1) Pretreatment of waste circuit boards

[0039] Put the waste circuit board into a shearing machine for preliminary shearing, and then put it into a grinder for crushing to obtain a fine-grained material with a particle size of 0.6 mm.

[0040] (2) Put the fine-grained material into deionized water, stir to make it fully dispersed in deionized water, and then send it to the shaker for gravity separation, and divide the material into heavy products and light products through shaker separation, remove Light products and heavy products are retained; the parameters of the shaking table are: transverse slope of 6°, stroke of 22mm, and stroke times of 320 times / min; the mass ratio of fine-grained materials to deionized water is 2.2:1.

[0041] (3) Take the bituminous coal powder, sodium chloride and heavy products for heat treatment respectively. The heat treatment parameters are as follows: first heat to 240°C, hold for 0.6h; then heat to 820°C, hold for 0.6h, and set asid...

Embodiment 3

[0045] (1) Pretreatment of waste circuit boards

[0046]Put the waste circuit board into a shearing machine for preliminary shearing, and then put it into a grinder for crushing to obtain a fine-grained material with a particle size of 0.7 mm.

[0047] (2) Put the fine-grained material into deionized water, stir to make it fully dispersed in deionized water, and then send it to the shaker for gravity separation, and divide the material into heavy products and light products through shaker separation, remove Light products and heavy products are retained; the parameters of the shaking table are: the transverse slope is 7°, the stroke is 24mm, and the stroke frequency is 340 times / min; the mass ratio of fine-grained materials to deionized water is 2.8:1.

[0048] (3) Take lignite powder, calcium chloride and heavy products and heat treat them separately. The heat treatment parameters are as follows: firstly heat to 320°C and hold for 0.8h; then heat to 860°C and hold for 08h for...

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PUM

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Abstract

The invention discloses a method for extracting nonferrous metal from a waste circuit board. The method comprises the following steps that 1, the waste circuit board is pretreated so as to obtain fine-particle materials; 2, the fine-particle materials are subjected to gravity separation so as to obtain a heavy product; 3, a reducing agent, a chlorinating agent and the heavy product are subjected to heat treatment correspondingly; 4, valuable metal is subjected to a chlorination reaction; and 5, ferromagnetic materials are removed, and a concentrate of the nonferrous metal is obtained. According to the extracting method, the circuit board is crushed and heated, a mixture containing the nonferrous metal is obtained, emission of a large amount of harmful gas and solid waste is reduced, and thus the environment is protected; a wet-type shaking-table sorting method is adopted, and thus dust is avoided; and a combination of reaction material preheating and high-temperature chlorination is adopted, the chlorine retention capacity and the chlorination efficiency of the valuable metal are improved, the dosage of the chlorinating agent is decreased, the extracting process is simplified, andthe recycling cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal extraction methods, and in particular relates to a method for extracting nonferrous metals from waste circuit boards. Background technique [0002] Non-ferrous metals, non-ferrous metals in the narrow sense are called non-ferrous metals, which refer to all metals except iron, manganese and chromium; in the broad sense, non-ferrous metals also include non-ferrous alloys, which are based on a non-ferrous metal and added with one or An alloy composed of several other elements. [0003] In recent years, with the development and progress of society, the amount of electronic waste is increasing at an alarming rate. As an important part of electronic products, printed circuit boards exist in almost all electronic equipment. The metal content in printed circuit boards accounts for about 40%, of which the main valuable metals are non-ferrous metals, and the content of copper, tin, gold, silver a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/30C22B1/08C22B7/00
CPCB03C1/30C22B1/08C22B7/00
Inventor 沈小利牛会梅
Owner 宝鸡市铭坤有色金属有限公司
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