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Method for extracting copper and gold from waste mobile phone circuit board

A circuit board, mobile phone technology

Inactive Publication Date: 2016-11-09
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The current processing technology mainly focuses on the extraction of metals from waste computer circuit boards, while waste mobile phone circuit boards are neglected due to their small size and difficulty in recycling. Technical problems of metal extraction in mobile phone circuit boards
At the same time, because of the instability of thiourea itself, the effect of extracting gold by thiourea method is not ideal in the process of use. Therefore, it is necessary to study the optimal parameters for extracting gold from mobile phone circuit boards by thiourea method

Method used

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  • Method for extracting copper and gold from waste mobile phone circuit board

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] In nitric acid leaching copper step, adopt parameter: nitric acid concentration 4.5mol / L, reaction time 40min, reaction temperature 45 ℃, solid-liquid ratio (mass / volume) 1:15, stirring speed 400r / min, obtained 97.95% Copper leaching rate.

Embodiment 2

[0029] In nitric acid leaching copper step, adopt parameter: nitric acid concentration 5.5mol / L, reaction time 60min, reaction temperature 55 ℃, solid-liquid ratio (mass / volume) 1:25, stirring speed 400r / min, obtained 94.75% Copper leaching rate.

Embodiment 3

[0031] In thiourea leaching gold step, adopt parameter: thiourea concentration 9g / L, Fe 3+ The concentration was 4g / L, the reaction time was 45min, the reaction temperature was 30°C, the pH was 1.5, the stirring speed was 400r / min, and the solid-liquid ratio (mass / volume) was 1:20. The gold leaching rate was 95.88%.

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Abstract

The invention relates to a method for extracting copper and gold from a waste mobile phone circuit board, and belongs to the field of resource recycling. At present, main extraction objects for metal in circuit boards are computer mainboards, and methods for extracting metal in mobile phone circuit boards are few. The method can solve the problem. Meanwhile, optimized parameters can solve the problems existing in previous thiourea methods applied to gold extraction. Extraction of the copper and the gold is completed mainly through a nitric acid method-thiourea method two-step method, and the high copper and gold leaching efficiency can be obtained through the method. The method can be used for treating the metal in the waste mobile phone circuit board in resource recycling enterprises.

Description

【Technical field】 [0001] The invention belongs to the field of resource circulation. 【Background technique】 [0002] At present, most of the research on metal extraction from waste circuit boards focuses on computer circuit boards, and there is less research on metal extraction from mobile phone circuit boards. [0003] The methods for the extraction of metals in waste circuit boards mainly include: wet method, fire method, microbial method, and some emerging methods such as supercritical oxidation method. Among these methods, wet method is used more, because it is more effective for metals step by step. Extraction and recycling are relatively easy to implement and have relatively little impact on the environment. [0004] Commonly used copper recovery methods in wet methods include: nitric acid method, sulfuric acid-hydrogen peroxide method, ferric chloride method, ammonia method, etc. Although the sulfuric acid-hydrogen peroxide method is relatively clean, it is relative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B11/00
CPCC22B7/006C22B11/046C22B15/0073C22B15/0091Y02P10/20
Inventor 徐鹤刘宇刘俊利路原野康家慧
Owner NANKAI UNIV
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