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A method of gasification and reburning denitrification of electrolytic aluminum waste cathode carbon blocks

A waste cathode carbon block, electrolytic aluminum technology, applied in gasification process, granular/powder fuel gasification, fuel and other directions, can solve the problem of difficult high-value utilization, etc., achieve easy gasification and complete, easy low-nitrogen combustion , the effect of large ash content

Active Publication Date: 2022-04-05
山东魏桥铝电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The base ash content of the carbon block is 32% to 47%, and the 3NaF·AlF in the carbon block 3 , NaF, CaF 2 After high-temperature combustion, it is converted into solid waste such as coal ash and slag, which is difficult to use at high value

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  • A method of gasification and reburning denitrification of electrolytic aluminum waste cathode carbon blocks

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Embodiment 1

[0037] A gasification and reburning denitrification method and application of electrolytic aluminum waste cathode carbon blocks, comprising the following steps:

[0038] (1) Break electrolytic aluminum waste and old cathode carbon blocks into fragments with a particle size of ≤30mm through a hammer crusher, and add quicklime powder (particle size≤30mm) at a calcium-to-fluorine molar ratio of 1:2, and the ratio of water to solid materials is 60 : 100, carry out ball milling, make carbon slurry fuel;

[0039] (2) The cumulative mass of particles with a solid particle size less than 45 μm in the prepared carbon slurry fuel accounts for 90% of the total mass of solid particles;

[0040] (3) Texaco pressurized gasifier is used, the gasification pressure is 6.5MPa, the gasification temperature is 1350°C; the carbon conversion rate can reach up to 99%, and the effective gas (CO+H) in the gasification gas 2 ) volume content of 83%.

[0041] (4) passing the gasification gas through t...

Embodiment 2

[0044]A gasification and reburning denitrification method and application of electrolytic aluminum waste cathode carbon blocks, comprising the following steps:

[0045] (1) Use a hammer crusher to crush the waste cathode carbon blocks of electrolytic aluminum into fragments with a particle size of ≤30mm, and add quicklime powder (particle size≤30mm) at a calcium-to-fluorine molar ratio of 1:1.5, and the ratio of water to solid materials is 65 : 100, carry out ball milling, make carbon slurry fuel;

[0046] (2) The cumulative mass of solid particles with a diameter less than 45 μm in the prepared carbon slurry fuel accounts for 95% of the total mass of solid particles;

[0047] (3) Texaco pressurized gasifier is used, the gasification pressure is 6.5MPa, the gasification temperature is 1400℃; the carbon conversion rate can reach 99.3%, and the effective gas (CO+H 2 ) volume content of 83.5%.

[0048] (4) Combined with the low-nitrogen combustion transformation of coal-fired b...

Embodiment 3

[0050] A gasification and reburning denitrification method and application of electrolytic aluminum waste cathode carbon blocks, comprising the following steps:

[0051] (1) Break electrolytic aluminum waste and old cathode carbon blocks into fragments with a particle size of ≤30mm through a hammer crusher, and add quicklime (particle size≤30mm) according to the calcium fluorine mole ratio of 1:2, and the ratio of water to solid materials is 65:100 .

[0052] (2) The particle size of solid particles in the prepared carbon slurry fuel is less than 45 μm, and the cumulative mass of particles with a particle size of less than 45 μm accounts for 95% of the total mass of solid particles;

[0053] (3) Texaco pressurized gasifier is used, the gasification pressure is 6.5MPa, the gasification temperature is 1400℃; the carbon conversion rate can reach 99.3%, and the effective gas (CO+H 2 ) volume content up to 83.5%.

[0054] (4) Combined with the low-nitrogen combustion transformati...

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Abstract

The invention discloses a gasification and reburning denitrification method of electrolytic aluminum waste and old cathode carbon block, which comprises the following steps: crushing electrolytic aluminum waste and old cathode carbon, mixing with quicklime and water and ball milling to make carbon slurry; gasifying the carbon slurry, gasifying The melting temperature is above the melting temperature of cryolite and below 1500°C. The method realizes the recycling of alumina and fluoride of the carbon block ash, the gasification gas is used as a clean fuel, or is used as a reburning fuel in a coal-fired boiler, and the disposal amount of the carbon block is large, and the process is clean and efficient.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum waste cathode carbon block treatment, in particular to a gasification and reburning denitrification method of electrolytic aluminum waste cathode carbon block. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The electrolytic aluminum process produces solid wastes including cathodes, side carbon blocks, anti-seepage materials, refractory bricks, cold stamping paste, thermal insulation bricks, and thermal insulation boards due to the overhaul of the aluminum electrolytic cell. According to the service life of the electrolytic cell, that is, the overhaul period is 4 to 6 years, equiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32C10J3/46C10J3/72
CPCC10L1/32C10J3/46C10J3/72C10J2300/0946
Inventor 崔石磊纪登攀韩奎华张继刚赵芳芳宋平
Owner 山东魏桥铝电有限公司
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