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Method for recovering metals in waste thin electric wires, messed electric wires or miscellaneous electric wires by thermal decomposition

A recycling method and wire technology, applied in the field of resources and environment, can solve the problems of inseparability, environmental pollution, different scales, etc., and achieve the effect of meeting the requirements of subsequent processes, meeting the requirements of resource recovery, and no oxidation mechanical loss.

Inactive Publication Date: 2010-05-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the production process and separation principle, domestic and foreign copper rice machines have a relatively large selectivity for feeding waste wires and cables. Each feeding must be of the same size and straightened out. Wires below a certain size cannot be separated.
However, the actual waste wires and cables include most broken wires, messy wires, and thin wires. Due to their different sizes, disorderly, or too thin wire diameters, these raw materials cannot be dismantled mechanically at present, and the number has been increasing year by year. into trouble
Some current workshop-style processing uses uncontrolled incineration, which not only causes great environmental pollution, but also has a very low recovery rate of metals

Method used

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  • Method for recovering metals in waste thin electric wires, messed electric wires or miscellaneous electric wires by thermal decomposition
  • Method for recovering metals in waste thin electric wires, messed electric wires or miscellaneous electric wires by thermal decomposition

Examples

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Effect test

example 1

[0019] (1) The thin wire with insulated PVC sheath is first subjected to thermal treatment. In an inert atmosphere, the wire material is heated at a heating rate of 10°C / min to 580°C and kept at a constant temperature for 20 minutes;

[0020] (2) Take out the thin wires treated in (1) and perform minor mechanical interference; the remaining attachments outside the metal wires fall off automatically, and the metal basically remains unchanged; the metal recovery rate reaches 99%.

example 2

[0022] (1) Thermal treatment of thin wires with insulated polyethylene sheath, heating the wire raw materials at a heating rate of 20°C / min under an inert atmosphere to 650°C and holding it at a constant temperature for 10 minutes;

[0023] (2) Take out the thin wire treated in (1), and perform a slight vibration; a small amount of remaining attachments outside the metal wire will automatically fall off, and the metal will basically maintain its original state. The metal recovery rate is 99%.

example 3

[0025] (1) Put the messy wires with insulated polyvinyl chloride poly and insulated polyethylene sheaths together for thermal treatment. In an inert atmosphere, heat the wire raw materials at a heating rate of 15°C / min to 600°C and keep the temperature at 15°C. minute;

[0026] (2) After stopping the furnace for half an hour, take out the wire material treated in (1) and perform minor mechanical interference; the remaining attachments outside the metal wire will automatically fall off, and the metal will basically remain unchanged. The metal recovery rate is 99%.

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Abstract

The invention relates to a method for recovering metals in waste thin electric wires, messed electric wires or miscellaneous electric wires by thermal decomposition. The method includes the following steps of: carrying out oxygen-poor hot treatment on thin electric wires, messed electric wires or broken electric wires, heating enamelled wire raw materials to 580 DEG C to 650 DEG C at the rate of temperature rise of 10-20 DEG C under inert atmosphere or oxygen-poor atmosphere, and maintaining the temperature for 10 to 20 minutes; and slightly and mechanically stirring or vibrating the processed electric wires so as to lead attached residuals to fall automatically. After processing, the metal wires basically remain the original performances and do not suffer oxidation and mechanical loss; and the metal recovery ratio is nearly as high as 99 percent, and the purity is also high. The method meets the requirement of subsequent working procedures on use and the requirement on resource recovery, thereby realizing the maximum separate recovery of renewable resources in waste; and furthermore, by adopting anoxic low temperature decomposition, the relative air displacement is low and requirements of cleaning processes can be met, thereby contributing to the reduction of secondary pollution of atmospheric environment.

Description

Technical field [0001] The invention belongs to the technical field of resources and environment, and particularly relates to a pyrolysis recovery method of metal in waste thin wires, messy wires or miscellaneous wires. Background technique [0002] Judging from the status quo of resources in my country, the current shortage of non-ferrous metal resources has reached a very serious level. Among the 113 large-scale non-ferrous mines in the country, 56.5% of mines have exhausted proven resources, 28.9% of resources are in crisis, and reserve resources. Only about 40% are guaranteed. The country spends a lot of foreign exchange every year to import non-ferrous metals such as copper, aluminum, lead, and zinc. Therefore, the circular economy model based on the processing of renewable resources is of great strategic significance for solving domestic resource shortages, reducing the development of primary resources, and developing comprehensive utilization of resources. The recycling of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B15/00C22B7/00
CPCY02P10/20Y02W30/82
Inventor 邓娜张于峰马洪亭吴正胜陈鑫力魏姗姗
Owner TIANJIN UNIV
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