Enrichment and separation method of chromium in multi-metal mixed resources of waste circuit boards

A technology for waste circuit boards and separation methods, applied in the direction of improving process efficiency, etc., can solve the problems of large consumption of chemical reagents, limited effect, waste of resources, etc., reduce secondary pollution, simple method, and energy saving Effect

Active Publication Date: 2016-12-07
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
If the chromium element in the polymetallic mixture of discarded circuit boards is not handled properly, on the one hand, it will cause great harm to humans, animals and plants, such as excessive heavy metal chromium in groundwater and soil; to recovery and recycling, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, a verification experiment was carried out for the separation of chromium element in the multi-metal mixture of waste circuit boards. Firstly, chemical analysis was carried out on the multi-metal complex mixture containing chromium element in the crushed + sorted waste circuit boards, and the mass contents of copper and iron were measured to be ~76% and ~4.5%, respectively. Iron metal disassembled from electronic waste is added to the complex polymetallic mixture as a collector iron element, and after adding iron, the mass content of iron in the polymetallic mixture reaches -30%. Put the prepared multi-metal complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, the power supply of the vacuum heating furnace was started, and the polymetallic mixture in the melting furnace was heated until the temperature reached ~1400° C., and the temperature was maintained for 5...

Embodiment 2

[0035] In this example, a verification experiment was carried out for the separation of chromium element in the multi-metal mixture of waste circuit boards. Firstly, chemical analysis was carried out on the polymetallic complex mixture containing chromium element in the crushed + sorted waste circuit boards, and the mass contents of copper and iron were measured to be ~78% and ~4.3%, respectively. Iron metal disassembled from electronic waste is added to the complex polymetallic mixture as a collector iron element, and after adding iron, the mass content of iron in the polymetallic mixture reaches -30%. Put the prepared multi-metal complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, the power supply of the vacuum heating furnace is started, and the multi-metal mixture in the melting furnace is heated until the temperature is ~1400° C., and the temperature is kept for 5 minutes. Aft...

Embodiment 3

[0037] In this example, a verification experiment was carried out for the separation of chromium element in the multi-metal mixture of waste circuit boards. Firstly, chemical analysis was carried out on the polymetallic complex mixture containing chromium element in the crushed + sorted waste circuit boards, and the mass contents of copper and iron were measured to be ~76% and ~4.4%, respectively. Iron metal disassembled from electronic waste is added to the complex polymetallic mixture as a collector iron element, and after adding iron, the mass content of iron in the polymetallic mixture reaches -30%. Put the prepared multi-metal complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, the power supply of the vacuum heating furnace is started, and the multi-metal mixture in the melting furnace is heated until the temperature is ~1400° C., and the temperature is kept for 5 minutes. Aft...

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PUM

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Abstract

The invention belongs to the technology for comprehensive recycling of complex secondary non-ferrous metal resources, and particularly relates to an enrichment and separation method for chromium 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 chromium elements is obtained; a trapping 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, a trace amount of enrichment reagent phosphorus is added, the separation rate of liquid copper and liquid iron is adjusted, and the chromium elements are enriched into a liquid iron phase so that separated melt with the upper layer being the liquid iron and the lower layer being the liquid copper can be formed; and the upper layer liquid iron with the trapped chromium elements is poured out. Accordingly, the chromium elements are separated from the multi-metal complex mixture of the discarded circuit boards and are 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 secondary non-ferrous metal resources, in particular to a method for enriching and separating chromium elements in multi-metal mixed resources of waste circuit boards, and relates to the recovery and regeneration of electronic wastes in the technical field of environmental protection And comprehensive high-efficiency recycling 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 waste electronic products have become the fastest growing and most difficult type of solid waste to deal with. Electronic waste, also known as electronic waste, includes various waste computers, communication equi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/32
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
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