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Method for recycling waste aluminum ring-pull cans in green circular relegation way

An environmentally friendly technology for pop-top cans, which is applied in the field of green recycling and re-use of waste aluminum pop-top cans.

Active Publication Date: 2013-02-06
DELTA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] It can be seen that the existing patented technologies for recycling and processing waste aluminum cans all involve one process technology, and some technologies have serious secondary pollution, and the obtained aluminum alloy products are downgraded and practical

Method used

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  • Method for recycling waste aluminum ring-pull cans in green circular relegation way

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The waste aluminum cans are mechanically broken up and shredded to obtain scattered fragments, and then the ferromagnetic metals mixed in the cans are separated by a magnetic separator to avoid mixing into the subsequent process.

[0034] The can fragments were thermally depainted at an oxygen partial pressure of 8% and a temperature of 450°C for 120 minutes. The flue gas generated during the thermal stripping process is sent to the combustion furnace through the flue gas pipe, and after burning at a high temperature above 1000 ° C, the dioxins are eliminated. The flue gas temperature is rapidly cooled to below 130°C by a heat exchanger to inhibit the re-synthesis of dioxins. The cooled flue gas is treated by bag dust removal, activated carbon adsorption, and desulfurization and denitrification towers, and is discharged after meeting environmental protection requirements. The can fragments after thermal depainting are vibrated by the vibrating screen to remove the adhe...

Embodiment 2

[0041] The waste aluminum cans are mechanically broken up and shredded to obtain scattered fragments, and then the ferromagnetic metals mixed in the cans are separated by a magnetic separator to avoid mixing into the subsequent process.

[0042] The can fragments were thermally stripped for 80 minutes at an oxygen partial pressure of 0 and a temperature of 500°C. The flue gas generated during the thermal stripping process is sent to the combustion furnace through the flue gas pipe, and after burning at a high temperature above 1000 ° C, the dioxins are eliminated. The flue gas temperature is rapidly cooled to below 130°C by a heat exchanger to inhibit the re-generation of dioxins. The cooled flue gas is treated by bag dust removal, activated carbon adsorption, and desulfurization and denitrification towers, and is discharged after meeting environmental protection requirements. The can fragments after thermal depainting are vibrated by the vibrating screen to remove the adhere...

Embodiment 3

[0049] The waste aluminum cans are mechanically broken up and shredded to obtain scattered fragments, and then the ferromagnetic metals mixed in the cans are separated by a magnetic separator to avoid mixing into the subsequent process.

[0050] The can fragments were thermally depainted at an oxygen partial pressure of 4% and a temperature of 550°C for 60 minutes. The flue gas generated during the thermal stripping process is sent to the combustion furnace through the flue gas pipe, and after burning at a high temperature above 1000 ° C, the dioxins are eliminated. The flue gas temperature is rapidly cooled to below 130°C by a heat exchanger to inhibit the re-generation of dioxins. The cooled flue gas is treated by bag dust removal, activated carbon adsorption, and desulfurization and denitrification towers, and is discharged after meeting environmental protection requirements. The can fragments after thermal depainting are vibrated by the vibrating screen to remove the adhe...

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PUM

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Abstract

The invention relates to a green circular recycling technology of waste aluminum ring-pull cans, belonging to the technical field of circular economy. A technology for preparing aluminum alloy used for producing ring-pull cans from waste aluminum ring-pull cans as a raw material through the procedures of crushing, magnetic separating and iron removing, paint removing, smelting, component adjusting, filtering and casting is developed. The pollution-free relegation circular recycling of the waste ring-pull cans is achieved through low-oxygen-partial-pressure hot paint removing, undersurface smelting, online component analysis and adjusting, modification, filtering and casting. The method has the characteristics of environment protection, relegation recycling and easiness for industrial production and has significant economic, environmental and social benefits.

Description

technical field [0001] The invention provides a method for recycling waste aluminum pop cans, which belongs to the field of circular economy technology and environmental protection, and in particular relates to a method for green recycling of waste aluminum pop cans for grade-preserving reuse. [0002] Background technique [0003] According to estimates, the recycling rate of waste aluminum cans in my country is over 96%, and at least 400,000 tons of waste cans are recycled every year, plus a small amount of imports, the total amount is about 500,000 tons. The existing waste aluminum pop cans are of a low level of recycling and reuse, and the recycling process causes serious environmental pollution. The main reason is that the level of recycling technology is low and the technology is difficult. The following five technical difficulties need to be solved: (1) The aluminum alloy composition of the waste aluminum pop can body is different from that of the lid and the pull ri...

Claims

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Application Information

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IPC IPC(8): C22B7/00
CPCC22B7/00C22B21/0069C22B21/00C22B21/0007Y02P10/20
Inventor 张深根刘波潘德安田建军刘阳
Owner DELTA ALUMINUM IND
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