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A kind of treatment method of electrolytic aluminum carbon-containing waste residue

A treatment method and technology for electrolytic aluminum, applied in the direction of improving process efficiency, etc., can solve the problems of recycled product graphite, low fluoride purity, inability to achieve harmless carbon residue, incomplete harmless treatment, etc. The effect of full contact, low cost and low running cost

Active Publication Date: 2021-02-19
湖南绿脉环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this type of method is that the recovery rate of the electrolyte is low, and the particle size is too fine, the carbon mud still contains about 20% of the electrolyte, and the leaching toxicity of this part of the waste residue still exceeds the standard, which cannot meet the requirements of completely harmless carbon residue; harmless The chemical treatment is not thorough, and the wet treatment cannot avoid the production of toxic gas HCN and flammable and explosive gas CH 4 ; The purity of the recycled products such as graphite and fluoride is low; for example, the compressive strength of waste cathode is as high as 40MPa, the crushing ball mill is difficult, and the crushing equipment consumes a lot of energy

Method used

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  • A kind of treatment method of electrolytic aluminum carbon-containing waste residue
  • A kind of treatment method of electrolytic aluminum carbon-containing waste residue
  • A kind of treatment method of electrolytic aluminum carbon-containing waste residue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The carbon slag is processed in a tunnel kiln.

[0034] The carbon slag is broken and sprayed with the catalytic liquid for 5 minutes. The mass percentage of the catalytic liquid is: NaCl 15%, KCl 10%, NaF 5%, VCl 2 1%, the rest is water, using a 35-meter-long tunnel kiln, the kiln car advancing speed is 2.2h / car, the loading capacity is 660kg, the pretreatment section is 10 meters, the temperature is 350°C, the oxidation section is 15 meters, and the temperature is controlled at 670-680°C , after 12 hours of oxidation, carry out the slagging section. The oxidized residue weighs 528kg, and the residue is mainly fluoride. The detection indicators are shown in Table 1.

[0035] Table 1

[0036]

[0037]

Embodiment 2

[0039] Tunnel kiln is used to process carbon slag flotation carbon mud.

[0040] The flotation carbon mud is sprayed with catalytic liquid for 5 minutes, and the mass percentage of catalytic liquid is composed of: NaCl 18%, KCl 5%, NaF 15%, VCl 2 1%, the rest is water, using a 50-meter-long tunnel kiln, the kiln car advancing speed is 1.5h / car, the loading capacity is 650kg, the pretreatment section is 10 meters, the temperature is 350°C, the oxidation section is 20 meters, and the control temperature is 650-685°C. After oxidizing for 10 hours, carry out slag discharge. The oxidized residue weighs 390kg, and the residue is mainly fluoride. The detection indicators are shown in Table 2.

[0041] Table 2

[0042]

Embodiment 3

[0044] Rotary kiln is used to process the scrap cleaning material.

[0045] The residual electrode cleaning material is sprayed with catalytic liquid for 8 minutes, and the mass percentage of catalytic liquid is composed of: NaCl 12%, KCl 6%, NaF 7%, VCl 2 2%, the rest is water, using a 60-meter-long rotary kiln, the rotary kiln speed is 0.4r / min, the loading capacity is 650kg, the pretreatment section is 10 meters, the temperature is 350°C, the oxidation section is 32 meters, and the control temperature is 650-685°C. After oxidizing for 8 hours, carry out slag discharge. The oxidized residue weighs 390kg. The residue is mainly fluoride and iron impurities. The detection indicators are shown in Table 3.

[0046] table 3

[0047]

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Abstract

The invention belongs to the technical field of treating carbon-containing hazardous waste in the electrolytic aluminum industry, and specifically discloses a treatment method for electrolytic aluminum carbon-containing waste residue. The treatment method of the electrolytic aluminum carbon-containing waste slag provided by the present invention is to crush the electrolytic aluminum carbon-containing waste slag, mix it with a catalyst during the crushing process or after crushing, and then heat, oxidize and calcinate, the carbon material in the electrolytic aluminum carbon-containing waste slag material is oxidized, oxidized The remaining material obtained is the recovered fluorine-containing electrolyte product. Through the low-temperature oxidation and gasification of carbon materials contained in carbonaceous waste residue, during the low-temperature oxidation process, the electrolyte does not react, and the remaining residue after the carbon material is completely oxidized is the electrolyte, and there is no flue gas with fluoride and corrosion The problem of the equipment has achieved the purpose of effectively separating the carbon material and the electrolyte material, and realized the effective recovery of the electrolyte material in the carbon-containing waste residue of electrolytic aluminum.

Description

technical field [0001] The invention relates to the technical field of treatment of carbon-containing hazardous waste in the electrolytic aluminum industry, in particular to a treatment method for electrolytic aluminum carbon-containing waste residue. Background technique [0002] Electrolytic aluminum carbon-containing hazardous waste includes carbon slag, spent cathode carbon blocks (including carbon materials such as tamping paste, side carbon blocks), residual electrode cleaning materials, and overhaul slag, etc., because they contain toxic substances such as soluble fluoride Included in the "National Hazardous Waste List" - HW48 Non-ferrous metal smelting waste - salt slag and scum produced in the process of electrolytic aluminum. Carbon slag, in the production process of electrolytic aluminum, due to various reasons such as long-term erosion and washing of electrolyte, uneven combustion, selective oxidation, and unqualified quality, the anode carbon block and cathode c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C25C3/12C25C3/18
CPCC22B1/02C22B7/001C22B7/009C25C3/125C25C3/18Y02P10/20
Inventor 陈湘清唐剑陈小松陈黎军娄世彬陈环月
Owner 湖南绿脉环保科技股份有限公司
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