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Enrichment and separation method of tin element 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 unrecoverable metal elements, large consumption of chemical reagents, secondary pollution, etc., and achieve simple and easy enrichment and separation methods, reduce Small secondary pollution, energy saving effect

Active Publication Date: 2017-01-18
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 tin in polymetallic mixture of discarded circuit boards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, a verification experiment was carried out for the enrichment and separation of tin elements in the polymetallic mixture of discarded circuit boards. First of all, crushing + sorting waste circuit boards, separating metals from non-metals in waste circuit boards, and obtaining a multi-metal complex mixture containing tin elements. Add silicon element as a separating agent to the polymetallic complex mixture, so that the mass fraction of the silicon element in the polymetallic mixture is ~10%, 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 reduce the volatilization of low melting point metal elements and avoid metal oxidation during heating. Turn on the power supply of the vacuum heating furnace and heat to 1100°C. After the multi-metal mixtu...

Embodiment 2

[0034] In this example, a verification experiment was carried out for the enrichment and separation of tin elements in the polymetallic mixture of discarded circuit boards. Firstly, the waste circuit boards are crushed and sorted to separate the metals from the non-metals in the waste circuit boards, and obtain a multi-metal complex mixture containing tin elements. Add silicon element as a separating agent to the polymetallic complex mixture, so that the mass fraction of the silicon element in the polymetallic mixture is ~10%, 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 reduce the volatilization of low melting point metal elements and avoid metal oxidation during heating. Turn on the power supply of the vacuum heating furnace and heat to 1100°C. After the multi...

Embodiment 3

[0036] In this example, a verification experiment was carried out for the enrichment and separation of tin elements in the polymetallic mixture of discarded circuit boards. First of all, crushing + sorting waste circuit boards, separating metals from non-metals in waste circuit boards, and obtaining a multi-metal complex mixture containing tin elements. The polymetallic complex mixture is placed in a graphite crucible in a vacuum 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 reduce the volatilization of low melting point metal elements and avoid metal oxidation during heating. Turn on the power supply of the vacuum heating furnace and heat to 1100°C. After the multi-metal mixture in the graphite crucible is completely melted, mechanically stir for 5 minutes and keep warm for 10 minutes. Then, the temperature of the melt was lowered to 900° C., and the lead in...

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PUM

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Abstract

The invention belongs to comprehensive recycling technologies for complex nonferrous metal secondary resources, and particularly provides an enrichment and separation method for the tin element in multi-metal mixed resources of a waste printed circuit board. Firstly, after the waste printed circuit board is crushed and sorted, a multi-metal complex mixture containing the tin element is obtained; a separating agent is added into the multi-metal complex mixture; 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, a collecting agent, namely lead, is added, and a melt is subjected to liquid-liquid separation to obtain liquid copper and liquid lead; then trace of enrichment reagent is added, the tin element is selectively enriched in the liquid lead phase, and due to the density difference, liquid phase layering of the melt in the crucible happens under the gravity effect, and separated melts with liquid copper at the upper layer and liquid lead at the lower layer are formed; and the layered melts are poured out respectively. Accordingly, tin is separated from the multi-metal complex mixture of the waste printed circuit board and can be recycled. The enrichment and separation method is simple and practicable, and has the characteristics of being low in cost, comprehensively 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 tin 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 equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B25/06
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