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Method for recovering valuable metal by oxidizing roasting packaged chip

An oxidative roasting and valuable metal technology, which is applied in the fields of comprehensive utilization of resources and comprehensive utilization of solid waste resources, can solve problems such as reducing the metal recovery rate, and achieve the effect of improving the recovery rate, reducing the processing capacity and ensuring the safety of operation.

Pending Publication Date: 2022-04-05
巩义市瑞赛克机械设备有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at home and abroad, the recycling of waste chips is classified into electronic waste for centralized processing. A small number of enterprises and institutions dedicated to chip recycling mostly focus on chip shaping and reuse, which leads to complete scrapping and inability to shape and reuse. The valuable metals in the chip are further diluted, which reduces the metal recovery rate

Method used

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  • Method for recovering valuable metal by oxidizing roasting packaged chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 200g of 200-mesh chips and place them in a muffle furnace for roasting. Oxidation roasting temperature: 400°C, time: 2.5h, grind the oxidized mixture, take 100g of the roasted mixture powder, add 250mL of 4mol / L sulfuric acid solution, and add 100mL Hydrogen peroxide, except leaching conditions: temperature: normal temperature, time: 2h; speed: 200r / min.

[0025] After the copper removal is completed, the copper removal mixture is filtered, and the filter residue is dried-grinded.

[0026] Add the copper removal slag to a mixed solution of 200g / L sodium chloride and 4mol / L hydrochloric acid, and inject chlorine gas for leaching gold. 150r / min.

[0027] The gold leaching rate of the oxidized baked package chip: 98.6%;

Embodiment 2

[0029] Take 200g of 200-mesh chips and place them in a muffle furnace for roasting. Oxidation roasting temperature: 400°C, time: 2.5h, grind the oxidized mixture, take 100g of the roasted mixture powder, add 250mL of 4mol / L sulfuric acid solution, and add 100mL Hydrogen peroxide, except leaching conditions: temperature: normal temperature, time: 2h; speed: 200r / min.

[0030] After the copper removal is completed, the copper removal mixture is filtered, and the filter residue is dried-grinded.

[0031] Add the copper removal slag to a mixed solution of 150g / L sodium chloride and 2mol / L hydrochloric acid, inject chlorine gas for leaching gold, the amount of chlorine gas introduced is 0.2ml / min, and the leaching conditions are: temperature 60°C, time 3.5h, Speed ​​150r / min.

[0032] The oxidized baked packaged chip, gold leaching rate: 95.3%

Embodiment 3

[0034] Take 200g of 200-mesh chips and place them in a muffle furnace for roasting. Oxidation roasting temperature: 400°C, time: 2.5h, grind the oxidized mixture, take 100g of the roasted mixture powder, add 250mL of 4mol / L sulfuric acid solution, and add 100mL Hydrogen peroxide, except leaching conditions: temperature: normal temperature, time: 2h; speed: 200r / min.

[0035] After the copper removal is completed, the copper removal mixture is filtered, and the filter residue is dried-grinded.

[0036] Add copper removal slag to a mixed solution of 200g / L sodium chloride and 4mol / L hydrochloric acid, inject chlorine gas for gold leaching, the amount of chlorine gas introduced is 0.6ml / min, and the leaching conditions are: temperature 90°C, time 4h, speed 150r / min.

[0037] The oxidized baked package chip, gold leaching rate: 99.5%

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Abstract

The invention relates to a method for extracting gold from a packaged chip through oxidizing roasting, and belongs to the field of comprehensive utilization of resources. The method comprises the following steps: crushing a circuit board chip to a certain size; placing the crushed powder in a muffle furnace for oxidizing roasting; after oxidizing roasting is finished, obtained powder is leached to remove copper; and performing gold leaching on the copper-removed slag to obtain a gold-containing leaching solution. According to the method, a method for extracting gold through chip oxidizing roasting and packaging is adopted, the technological thought of chip oxidizing roasting-oxidizing leaching copper removal-chloridizing leaching gold dissolution is adopted, and the blank of waste chip valuable metal resource recycling is filled up; chlorination gold leaching is adopted, so that the safety problem in the gold extraction process of an existing cyanide method is avoided, meanwhile, chips are prevented from being mixed into electronic waste for treatment, the metal recovery rate is increased, and remarkable economic and environmental benefits are achieved. According to the method, harm is turned into wealth, resource utilization of hazardous waste is achieved, the pressure of resources and the environment is relieved, and excellent economic and ecological benefits are achieved.

Description

technical field [0001] The invention relates to a method for recycling valuable metals by oxidizing and roasting packaged chips, which belongs to the technical field of comprehensive utilization of resources, in particular to the field of comprehensive utilization of solid waste resources. Background technique [0002] The continuous and huge amount of electronic waste has become an unavoidable problem in the world. Circuit boards, as the most basic and active electronic components, have a high proportion in electrical appliances. Circuit boards contain a large number of electronic chips. With the increase of waste circuit boards, waste electronics The number of chips has also increased dramatically. The amount of electronic chips is large and wide, containing toxic heavy metals (Pd, Cd, etc.), stable organic compounds (polycyclic aromatic hydrocarbons, phenyl ethers) and precious valuable metals (Au, Ag, etc.), which belong to electronic waste that is easy to pollute the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B15/00C22B11/06
CPCY02P10/20
Inventor 余霞邓晓辉孟祥晨申帅杰
Owner 巩义市瑞赛克机械设备有限公司