Method for efficient separation and recycling of precious metals in waste circuit board

A technology for waste circuit boards and precious metals, applied in the field of efficient separation and recovery of precious metals in waste circuit boards, can solve the problems of low cost and no pollution, achieve significant economic benefits and alleviate the shortage of metal resources

Active Publication Date: 2015-02-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no pollution-free, high-efficiency,

Method used

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  • Method for efficient separation and recycling of precious metals in waste circuit board
  • Method for efficient separation and recycling of precious metals in waste circuit board
  • Method for efficient separation and recycling of precious metals in waste circuit board

Examples

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Embodiment 1

[0045] In this embodiment, the method for efficiently separating and recovering precious metals from waste circuit boards utilizes the selective distribution of metal elements in waste circuit boards in a liquid phase separation system to achieve efficient separation of multi-metal components. Carry out a confirmatory experiment on it. Based on the composition of metal materials in waste circuit boards, a Fe-Pb liquid phase separation system was constructed, and the volume ratio of the two liquid phases was designed to be 1:1. In order to reduce the liquid phase separation temperature and avoid Pb volatilization due to temperature, the Fe-Pb liquid Add C element (in the form of C-containing ductile iron) to the phase separation system, so that the composition of the Fe-rich region formed by liquid phase separation is near Fe-4.3%C (mass percentage, the same below), and control the Fe-Pb alloy melt temperature (1200°C ~ 1300°C), and then add a small amount of common metal eleme...

Embodiment 2

[0047] Purchase waste circuit boards of desktop computer motherboards, ductile iron with a carbon content of about 4%, and Pb ingots from the market. For waste circuit boards, first use crushing + crushing machinery to process waste circuit boards, and finally crush waste circuit boards into 0.1-0.5mm particles step by step, and then use the difference in physical properties between metal and non-metal (such as: the density of metal particles is greater than that of non-metal, Metal has conductivity, etc.), and the crushed waste circuit board particles are separated into metal particles and non-metal particles after multi-stage winnowing and high-voltage electrostatic separation. The X-ray fluorescence spectrometer is used to determine that the metal material is composed of 13 elements such as Al, Si, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Sn, Sb, Au, Pb, etc., based on the main component of the metal material Fe , Cu, Pb, etc., first build a Fe-Cu high-temperature liquid phase separ...

Embodiment 3

[0051] Purchase waste circuit boards of desktop computer motherboards, ductile iron with a carbon content of about 4%, and Pb ingots from the market. For waste circuit boards, first use crushing + crushing machinery to process waste circuit boards, and finally crush waste circuit boards into 0.1-0.5mm particles step by step, and then use the difference in physical properties between metal and non-metal (such as: the density of metal particles is greater than that of non-metal, Metal has conductivity, etc.), and the crushed waste circuit board particles are separated into metal particles and non-metal particles after multi-stage winnowing and high-voltage electrostatic separation. The X-ray fluorescence spectrometer is used to determine that the metal material is composed of 13 elements such as Al, Si, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Sn, Sb, Pb, etc., based on the main components of the metal material Fe, Cu , Pb, etc., first build a Fe-Cu high-temperature liquid phase separati...

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Abstract

The invention belongs to the metal resources recycling technology, in particular relates to a method for efficient separation and recycling of precious metals in a waste circuit board, and achieves economic and environmental benefit win-win situation and other issues in electronic waste recycling. First of all, the waste circuit board is crushed into particles by mechanical processing technology, the particles are separated into metal and non-metal materials under high voltage electrostatic effect, then a Fe-Cu high temperature liquid phase separation system and a Cu-Pb relatively-low temperature liquid phase separation system are successively built; base metals and nonferrous metals are efficiently separated by use of rule of selective distribution of metal material components in the waste circuit board in a liquid phase separation system, almost all precious metals are enriched into a Cu-rich phase; by combination of hydrometallurgical technology, the precious metals are separated and extracted from a small amount of Cu-rich material enriched with the precious metals, the use amount of chemical reagents in metal multi-component separation and recovery process can be significantly reduced, and the harm of electronic waste on the ecological environment can be reduced.

Description

technical field [0001] The invention belongs to the recovery and reuse technology of metal resources, in particular to a method for efficiently separating and recycling precious metals in waste circuit boards. Background technique [0002] With the continuous innovation of science and technology and the upgrading of electronic and electrical products, electronic waste (WEEE) has become the fastest growing and most difficult type of solid waste. According to reports, the world produces about 40-60 million tons of electronic waste every year, while my country's annual output is about 3-5 million tons; in addition, some developed countries in the world transfer overseas, and 90% of "electronic waste "Entering Asia, 80% of which goes to China, these discarded electronics are reported to contain large amounts of precious metals. For example, discarded mobile phones, classic printed circuit boards, and precision electronic products contain precious metals at concentrations of abou...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B13/00C22B11/00
CPCY02P10/20
Inventor 何杰王中原郝红日杨志增孙倩赵九洲
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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