Method for producing high-purity carbon granules from waste carbon blocks in arc furnace

A technology of electric arc furnace and carbon block, which is applied in the direction of carbon preparation/purification, etc., can solve the problems of high environmental risk of landfill method, unqualified product quality of flotation method, unutilized valuable elements, etc., and achieve good conductivity, The effect of low environmental pressure and high stability

Active Publication Date: 2014-04-30
云南蓝天铝业环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have their own deficiencies, such as the landfill method has high environmental risks, valuable elements are not utilized, and the use of f

Method used

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  • Method for producing high-purity carbon granules from waste carbon blocks in arc furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 100 Kg of waste carbon block as raw material into the jaw crusher for preliminary crushing, then into the hammer crusher for crushing, and sieve to obtain particles larger than 10mm, particles of 3~10mm, particles smaller than 3mm and the particles collected during the crushing process dust. Return the particles larger than 10mm to the crusher and cycle the above steps to obtain particles of 3~10mm and particles smaller than 3mm. Combine the particles smaller than 3mm and dust in the above process for granulation to obtain particles with a particle size of 4~6mm, and 3~ The above-mentioned particles of 10mm were mixed to obtain 99Kg carbon particles, which were placed in a DC electric arc furnace, energized to start the arc, taken out and cooled to obtain 65Kg of the target high-purity carbon particles. The flue gas is recovered by the dust collection system, advanced into the settling chamber, then enters the cyclone dust collector, then enters the bag filter, and ...

Embodiment 2

[0034] Put 100 Kg of waste carbon block as raw material into the jaw crusher for preliminary crushing, then into the hammer crusher for crushing, and sieve to obtain particles larger than 10mm, particles of 3~10mm, particles smaller than 3mm and the particles collected during the crushing process dust. Return the particles larger than 10mm to the crusher and cycle the above steps to obtain particles of 3~10mm and particles smaller than 3mm. Combine the particles smaller than 3mm and dust in the above process for granulation to obtain particles with a particle size of 4~6mm, and 3~ The above-mentioned particles of 10mm were mixed to obtain 99Kg carbon particles, which were placed in a DC electric arc furnace, energized to start the arc, taken out and cooled to obtain 62Kg of the target high-purity carbon particles. The flue gas is recovered by the dust collection system, advanced into the settling chamber, then into the cyclone dust collector, then into the bag filter, and fina...

Embodiment 3

[0037] Put 100 Kg of waste carbon block as raw material into the jaw crusher for preliminary crushing, then into the hammer crusher for crushing, and sieve to obtain particles larger than 10mm, particles of 3~10mm, particles smaller than 3mm and the particles collected during the crushing process dust. Return the particles larger than 10mm to the crusher and cycle the above steps to obtain particles of 3~10mm and particles smaller than 3mm. Combine the particles smaller than 3mm and dust in the above process for granulation to obtain particles with a particle size of 4~6mm, and 3~ The above-mentioned particles of 10mm were mixed to obtain 99Kg of carbon particles, which were placed in a DC electric arc furnace, energized to start the arc, taken out and cooled to obtain 68Kg of the target high-purity carbon particles. The flue gas is recovered by the dust collection system, advanced into the settling chamber, then enters the cyclone dust collector, then enters the bag filter, a...

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Abstract

The invention discloses a method for producing high-purity carbon granules from waste carbon blocks in an arc furnace, which comprises the steps of pretreatment, preparation and after-treatment, and specifically comprises the following steps: crushing the raw material waste carbon blocks, and screening to obtain waste carbon block granules; and adding the obtained carbon block granules into a direct-current arc furnace, electrifying to start arc, taking out, and cooling to obtain the target substance high-purity carbon granules, wherein fume generated by combustion enters a dust collecting system to be collected and recycled. The method has the advantages of simple technique and obvious environmental benefit, and uses waste in urgent need of treatment as the raw material; the whole production procedure adopts a dry process, and thus, does not generate wastewater; various resources are completely recycled, no that no waste is generated; and the gas is completely collected and purified, and thus, the environmental pressure is low. The fixed carbon content can reach 99% above, the ash content is less than 1%, the total sulfur is less than 0.5%, and the low heat value on air dry basis is greater than 8000 calories/g; and the high-purity carbon granules with the graphitization degree of higher than 80% have favorable electric conductivity,, favorable thermal conductivity, high stability and high heating value, and thus, are a favorable raw material for various graphite products and metallurgical industry.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization, and in particular relates to a method for producing high-purity carbon particles in an electric arc furnace using waste carbon blocks. Background technique [0002] High-purity carbon particles with a fixed carbon content of more than 99% and a graphitization degree of more than 80% have many excellent properties and are widely used. At present, the carbon content of waste cathode carbon blocks in domestic aluminum electrolytic overhaul cells is 60%-80%, and because they contain 20%-40% fluorine-containing impurities, they are hazardous wastes, and their production volume increases with the increase in electrolytic aluminum production. Domestic aluminum factories mainly use landfill, supplementary fuel for alumina and cement production, fluorite substitute for iron furnace, and flotation to separate and recover carbon and impurities. These methods have their own deficie...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 邹彪
Owner 云南蓝天铝业环保科技有限公司
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