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Enrichment and separation of antimony elements in multi-metal mixed resources of waste circuit boards

A waste circuit board and separation method technology, applied in the direction of process efficiency improvement, etc., can solve the problems of low metal leaching efficiency, large consumption of chemical reagents, secondary pollution, etc., achieve simple separation method, reduce secondary pollution, etc. Effects of pollution and energy conservation

Active Publication Date: 2017-01-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has low leaching efficiency and limited effect on some metals, especially the metal elements wrapped in ceramics cannot be recovered; the disadvantage of this technology is that the consumption of chemical reagents is large, and at the same time it produces a large amount of corrosive and toxic elements. As well as the waste liquid and waste residue of heavy metal ions, it is easy to cause secondary pollution
Although desoldering technology has been developed in the dismantling process of electronic waste (see "Method and Device for Separating and Recycling Circuit Board Components and Solder", Chinese Invention Patent, Patent No. CN200710201532.1, Publication No. CN101112728), there is currently no Reasonable methods for enrichment, separation and recycling of antimony in polymetallic mixture of discarded circuit boards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, a verification experiment was carried out for the enrichment and separation of antimony elements in the polymetallic mixture of discarded circuit boards. Firstly, the waste circuit boards are crushed and sorted, and the metals in the waste circuit boards are separated from non-metals to obtain a multi-metal complex mixture containing antimony. Add silicon as a separating agent to the polymetallic complex mixture so that the mass fraction of the silicon element in the polymetallic mixture is 9.5%, and place the configured polymetallic complex mixture in a graphite crucible in a vacuum heating furnace. Then, seal the vacuum heating furnace and start the vacuum pumping system. When the vacuum degree is <10Pa, fill the heating furnace cabin with nitrogen to make the air pressure reach 0.07MPa, so as to reduce the volatilization of low melting point metal elements and avoid the metal heating process. oxidation. Turn on the power supply of the vacuum heating...

Embodiment 2

[0033] In this example, a verification experiment was carried out for the enrichment and separation of antimony elements in the polymetallic mixture of discarded circuit boards. Firstly, the waste circuit boards are crushed and sorted, and the metals in the waste circuit boards are separated from non-metals to obtain a multi-metal complex mixture containing antimony. Add silicon as a separating agent to the polymetallic complex mixture so that the mass fraction of the silicon element in the polymetallic mixture is 9.5%, and place the configured polymetallic complex mixture in a graphite crucible in a vacuum heating furnace. Then, seal the vacuum heating furnace and start the vacuum pumping system. When the vacuum degree is <10Pa, fill the heating furnace cabin with nitrogen to make the air pressure reach 0.07MPa, so as to reduce the volatilization of low melting point metal elements and avoid the metal heating process. oxidation. Start the power supply of the vacuum heating f...

Embodiment 3

[0035] In this example, a verification experiment was carried out for the enrichment and separation of antimony elements in the polymetallic mixture of discarded circuit boards. Firstly, the waste circuit boards are crushed and sorted, and the metals in the waste circuit boards are separated from non-metals to obtain a multi-metal complex mixture containing antimony. Add silicon as a separating agent to the polymetallic complex mixture so that the mass fraction of the silicon element ratio in the polymetallic mixture is 10.5%, and place the configured polymetallic complex mixture in a graphite crucible in a vacuum heating furnace. Then, seal the vacuum heating furnace and start the vacuum pumping system. When the vacuum degree is <10Pa, fill the heating furnace cabin with nitrogen to make the air pressure reach 0.07MPa, so as to reduce the volatilization of low melting point metal elements and avoid the metal heating process. oxidation. Start the power supply of the vacuum he...

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PUM

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Abstract

The invention belongs to the technology for comprehensive recycling of complex non-ferrous metal secondary resources, and particularly relates to an enrichment and separation method for antimony elements in a discarded circuit board multi-metal mixed resource. The method includes the steps that firstly, after discarded circuit boards are crushed and separated, a multi-metal complex mixture containing the antimony elements is obtained; a separating agent is added into the multi-metal complex mixture, and the prepared multi-metal complex mixture is placed in a graphite crucible of a vacuum furnace; after the multi-metal complex mixture is completely melted, trapping agent lead is added, and melt liquid-liquid is separated into liquid copper and liquid lead; afterwards, a trace amount of enrichment reagent is added, and the antimony elements are selectively enriched into a lead liquid phase; due to the existence of density difference, the melt in the crucible is subjected to liquid phase layering under the effect of gravity, and the separated melt with the upper layer being the liquid copper and the lower layer being the liquid lead is formed; and the layered melt is poured out. Accordingly, antimony is separated from the multi-metal complex mixture of the discarded circuit boards and is further recycled. The method is simple and easy to implement and has the characteristics of being low in cost, comprehensive, efficient, free of pollution and the like.

Description

technical field [0001] The invention belongs to the comprehensive recycling and reuse technology of complex nonferrous metal secondary resources, specifically a method for enriching and separating antimony elements in multi-metal mixed resources of waste circuit boards, and relates to the recycling and regeneration of electronic waste in the technical field of environmental protection And comprehensive and efficient resource utilization technology will help to solve the harm of electronic waste to the ecological environment and alleviate the pressure of the shortage of non-ferrous metal resources in my country. Background technique [0002] With the continuous innovation of science and technology and the upgrading of electronic and electrical products, a large number of discarded electronic products have become the fastest growing and most difficult type of solid waste. Electronic waste, also known as electronic waste, includes all kinds of waste computers, communication equi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B30/02
CPCY02P10/20
Inventor 何杰王中原陈斌郝红日江鸿翔赵九洲
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI