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Enrichment and separation method of cobalt in waste circuit board multi-metal hybrid resources

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, waste of resources, etc., and achieve separation and recycling methods that are simple, easy, and reduce waste. Small secondary pollution, energy saving effect

Active Publication Date: 2015-11-11
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 cobalt element in the polymetallic mixture of waste circuit boards is not properly handled, on the one hand, it will cause great harm to humans, animals and plants, such as excessive cobalt elements in groundwater and soil; on the other hand, valuable secondary non-ferrous metal resources will not be obtained. Recycling and recycling, resulting in waste of resources

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 separation of cobalt elements in the polymetallic mixture of waste circuit boards. Firstly, chemical analysis was carried out on the cobalt-containing polymetallic complex mixture of waste circuit boards after crushing and sorting, and the mass content of copper and iron in it was measured to be ~77% and ~4.5%, respectively. Ductile iron with a carbon mass content of 4.5% is added to the polymetallic complex mixture as a collector, and after adding iron element, the iron mass content in the polymetallic mixture can reach ~25%. Put the configured multi-metallic complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, turn on the power supply of the vacuum heating furnace and heat it to ~1400°C. After the multi-metal mixture in the crucible is completely melted, add an iron-boron alloy trace enrichment agent with a b...

Embodiment 2

[0034] In this example, a verification experiment was carried out for the separation of cobalt elements in the polymetallic mixture of waste circuit boards. Firstly, chemical analysis was carried out on the cobalt-containing polymetallic complex mixture of waste circuit boards after crushing and sorting, and the mass content of copper and iron in it was measured to be ~77% and ~4.5%, respectively. Ductile iron with a carbon mass content of 4.5% is added to the polymetallic complex mixture as a collector, and after adding iron element, the iron mass content in the polymetallic mixture can reach ~25%. Put the configured multi-metallic complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, turn on the power supply of the vacuum heating furnace and heat it to ~1400°C. After the multi-metal mixture in the crucible is completely melted, add a trace enrichment agent of iron-niobium alloy with...

Embodiment 3

[0036] In this example, a verification experiment was carried out for the separation of cobalt elements in the polymetallic mixture of waste circuit boards. Firstly, chemical analysis was carried out on the cobalt-containing polymetallic complex mixture of waste circuit boards after crushing and sorting, and the mass content of copper and iron in it was measured to be ~77% and ~4.5%, respectively. Ductile iron with a carbon mass content of 4.5% is added to the polymetallic complex mixture as a collector, and after adding iron element, the iron mass content in the polymetallic mixture can reach ~25%. Put the configured multi-metallic complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, turn on the power supply of the vacuum heating furnace and heat it to ~1400°C. After the multi-metal mixture in the crucible is completely melted, add a trace enrichment agent of iron-niobium alloy with...

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Abstract

The invention belongs to the technology of comprehensive recycling of complex secondary nonferrous metal resources, and particularly relates to an enrichment and separation method of cobalt in waste circuit board multi-metal hybrid resources. The method includes the steps that firstly, a multi-metal complex mixture containing cobalt is obtained from a waste circuit board through smashing and sorting; a collecting 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 metal mixture is completely melted, trace enrichment reagent niobium or boron is added to regulate the separation rate of liquid copper and liquid iron; a liquid copper and liquid iron mixed melt is a separation melt, the upper layer of the separation melt is the liquid iron, and the lower layer of the separation melt is the liquid copper; and the liquid iron gathering cobalt on the upper layer is poured out, and cobalt is separated from the multi-metal complex mixture of the waste circuit board to be 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 complex secondary non-ferrous metal resources comprehensive recycling technology, specifically a method for enriching and separating cobalt elements in waste circuit board multi-metal mixed resources, and relates to the recycling and regeneration of electronic waste in the technical field of environmental protection And comprehensive and efficient resource recovery technology will help solve the harm of electronic waste to the ecological environment and alleviate the pressure on my country's shortage of non-ferrous metal resources. 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, household appliances, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00
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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