Method for Recovering Gold, Silver, Copper and Iron from Plasma-Caused Slag Containing Valuable Metals

a technology of plasma molten slag and recovery method, which is applied in the field of environmental friendly methods for recovering gold, silver, copper and iron from valuable metals contained plasma molten slag, which can solve the problems of excessive consumption of energy, hazard to the environment and loss of resources, and wear of machines,

Inactive Publication Date: 2010-12-16
INST NUCLEAR ENERGY RES ROCAEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is the primary objective of the present invention to provide an environmentally friendly method for recovering valuable metals from used printed circuit boards.

Problems solved by technology

If they are disposed of without recovering the valuable metals contained, it will be a hazard to the environment and loss of resources.
However, it consumes excessive energy because they contain a lot of elastic resin that is difficultly crushed to debris.
Moreover, there are problems related to production of undesired dust and noise and wearing of machines.
However, it takes much time and therefore expenses a lot of energy to burn the used printed circuit boards for low combustion efficiency.

Method used

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  • Method for Recovering Gold, Silver, Copper and Iron from Plasma-Caused Slag Containing Valuable Metals

Examples

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Embodiment Construction

[0011]Referring to FIG. 1, it reveals a method for recovering valuable metals from valuable metal-contained plasma-caused slag according to the preferred embodiment of the present invention. At 1, the slag is collected.

[0012]At 2, the slag is screened with a sieve with meshes of 0.149 mm. Thus, large debris 21 larger than 0.149 mm in size is separated from small debris 22 smaller than 0.149 mm in size.

[0013]At 3, the large debris 21 is tested with a magnet so that ferromagnetic debris 31 is separated from non-ferromagnetic debris 32. The ferromagnetic debris 31 can be provided to a steel-making factory. The non-ferromagnetic debris 32 is rich in copper and can be provided to a copper refinery.

[0014]At 4, the small debris 22 is tested with a magnet so that ferromagnetic debris 41 is separated from non-ferromagnetic debris 42. The ferromagnetic debris 41 can be provided to a steel-making factory.

[0015]At 5, primary sulfuric acid leaching occurs. The non-ferromagnetic debris 42 is leac...

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Abstract

There is disclosed an environmentally friendly method for recovering gold, silver, copper and iron from valuable metal-contained plasma-molten slag. At first, plasma is used to burn the used printed circuit boards, thus producing the slag. Then, the slag is grinded. Then, leaching, crystallization, precipitation, replacement and electric winning are conducted to recover gold, silver, copper and iron.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an environmentally friendly method for recovering gold, silver, copper and iron from valuable metal contained plasma-molten slag via plasma burning, grinding, leaching, crystallization, precipitation, replacement and electric winning.DESCRIPTION OF THE RELATED ARTS[0002]Used printed circuit boards contain valuable metals such as silver, gold, copper and iron. If they are disposed of without recovering the valuable metals contained, it will be a hazard to the environment and loss of resources. Conventionally, the used printed circuit boards can be directly crushed before the valuable metals are recovered as disclosed in Taiwanese Patent Publication Nos. 247281 and 36904 for example. However, it consumes excessive energy because they contain a lot of elastic resin that is difficultly crushed to debris. Moreover, there are problems related to production of undesired dust and noise and wearing of machines.[0003]Alternatively, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22B11/00C22B15/00
CPCC22B3/065C22B3/08C22B3/44C22B3/46C22B4/005C22B7/001C22B7/005C22B7/007C22B11/025C22B11/042C22B11/046C22B15/0089C22B15/0091Y02P10/234Y02P10/236Y02P10/214Y02P10/20
Inventor LEE, WEN-CHENGCHEN, CHING-LIANLEE, CHING-HWALIU, KUAN-TINGWU, SHAO-WENYEN, CHEN-YU
Owner INST NUCLEAR ENERGY RES ROCAEC
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