Continuous electrothermal furnace and method for resourceful treatment of aluminum electrolysis carbon electrode waste

A carbon electrode and electric heating furnace technology, applied in the field of aluminum electrolysis waste recycling, to ensure safety, avoid cyanide pollution, and avoid enrichment effects

Active Publication Date: 2021-10-08
江苏凯丰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a continuous electric heating furnace and method for recycling aluminum electrolytic carbon electrode waste, which is used to solve the current problem that it is difficult to safely and efficiently recycle waste cathode carbon blocks and anode carbon slag produced by electrolytic aluminum.

Method used

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  • Continuous electrothermal furnace and method for resourceful treatment of aluminum electrolysis carbon electrode waste
  • Continuous electrothermal furnace and method for resourceful treatment of aluminum electrolysis carbon electrode waste
  • Continuous electrothermal furnace and method for resourceful treatment of aluminum electrolysis carbon electrode waste

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Embodiment 1

[0107] The carbon electrode waste selected in this embodiment is the spent cathode carbon block, and the following treatment process is adopted.

[0108] (1) Use a jaw crusher to crush the waste cathode carbon blocks into carbon blocks with a particle size of 0-150mm, sort out the mixed aluminum flakes through a sorting machine or manually, remove the mixed scrap iron through an iron remover, and then use a hoist The processed waste cathode carbon blocks are transported to the raw material bin on the top of the electric furnace, and the raw material bin is fed to the waste heat preheating section of the preheating separation channel.

[0109] (2) In the waste heat preheating section, dry the water vapor in the waste cathode carbon block at a temperature from room temperature to 450°C to prevent water from reacting with hot carbon to form water gas. The reaction equation is C+H 2 O=CO+H 2 ; Digest trace cyanide 4NaCN+5O 2 = 2Na 2 O+4CO 2 +2N 2 ; Thermal expansion drives ou...

Embodiment 2

[0120] The carbon electrode waste selected in this embodiment is anode carbon slag flotation carbon powder, and the following treatment process is adopted.

[0121] (1) Transport the anode carbon slag flotation carbon powder to the raw material warehouse on the top of the electric furnace, and the anode carbon slag flotation carbon powder in the raw material warehouse is transported to the waste heat preheating section after being metered. In the residual heat preheating section, the water vapor in the anode carbon slag flotation carbon powder is dried at a temperature from room temperature to 450 ° C to prevent water from reacting with hot carbon to form water gas. The reaction equation is C+H 2 O=CO+H 2 ; Digest trace cyanide 4NaCN+5O 2 = 2Na 2 O+4CO 2 +2N 2 ; Thermal expansion drives out O 2 ; Eliminate carbon monoxide 2C+O generated by incomplete combustion of carbon 2 =2CO; Then, use the residual heat of the exhaust gas from the electric furnace to continue to prehe...

Embodiment 3

[0127] The carbon electrode waste selected in this embodiment is anode carbon slag, and the following treatment process is adopted.

[0128] (1) Use a jaw crusher to crush the anode carbon slag into carbon blocks with a particle size of 0-100mm. After removing iron from the aluminum sheet, use a hoist to transport the processed carbon blocks to the raw materials on the top of the electric furnace warehouse, and the material is fed from the raw material warehouse to the waste heat preheating section of the preheating separation channel.

[0129] (2) In the waste heat preheating section, dry the water vapor in the anode carbon slag at room temperature to 450°C to prevent water from reacting with hot carbon to form water gas. The reaction equation is C+H 2 O=CO+H 2 ; Digest trace cyanide 4NaCN+5O 2 = 2Na 2 O+4CO 2 +2N 2 ; Thermal expansion drives out O 2 ; Eliminate carbon monoxide 2C+O generated by incomplete combustion of carbon 2 =2CO; Then, the anode carbon slag is pre...

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Abstract

The invention provides a continuous electrothermal furnace and method for resourceful treatment of aluminum electrolysis carbon electrode waste. The electrothermal furnace for resourceful treatment of the aluminum electrolysis carbon electrode waste comprises a preheating separation channel and an electrothermal furnace body; the preheating separation channel comprises a waste heat preheating section and a melting separation section; the waste heat preheating section is used for preheating the carbon electrode waste by utilizing waste heat of flue gas in the electrothermal furnace body and the melting separation section; the melting separation section is used for heating, melting and separating the preheated carbon electrode wastes to correspondingly obtain an electrolyte, a silicon-aluminum mixture and a graphitized carburant product, and inputting the graphitized carburant product into the electrothermal furnace body; and performing high-temperature purification on the graphitized carburant product by the electrothermal furnace body to obtain a graphite scrap product. According to the method, resourceful treatment of the aluminum electrolysis carbon electrode waste is achieved, the hidden dangers such as coking and hardening, channel blockage and deflagration ash spraying in the treatment process can be effectively avoided, energy saving, environment friendliness, continuity, high efficiency, safety and reliability are achieved, and high-value utilization of the carbon electrode waste can be achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis waste recycling, in particular to a continuous electric heating furnace and a method for recycling aluminum electrolysis carbon electrode waste. Background technique [0002] The aluminum industry is the basic industry of the national economy, and it is also an industry with high energy consumption and high pollution. Its sustainable development has attracted more and more attention. In the process of aluminum electrolysis, a large amount of carbon electrode waste will be produced, which includes spent cathode carbon blocks and anode carbon slag. Because the waste cathode carbon block and anode carbon residue contain soluble toxic substances, such as cyanide and fluoride, if not handled properly, these toxic substances will easily pollute the surrounding soil, air and water. [0003] In related technologies, it is mainly attempted to use a high-temperature furnace to recycle waste c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00F23G5/02F23G5/033F23G5/04F23G5/10F23G5/44F23G5/46B09B3/00B09B5/00
CPCF23G7/00F23G5/02F23G5/033F23G5/04F23G5/10F23G5/44F23G5/46B09B5/00F23G2201/10F23G2201/60F23G2201/80F23G2202/20F23G2204/20F23G2206/10Y02P10/20
Inventor 骆玲彧
Owner 江苏凯丰新能源科技有限公司
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