Method of comprehensively utilizing aluminum dross to prepare anti-oxidation coating for carbon anode used for electrolytic aluminum

An anti-oxidation coating and electrolytic aluminum technology, applied in the direction of fireproof coatings, coatings, etc., can solve the problems of land occupation, water and soil pollution, etc., achieve the effects of reducing difficulty, realizing waste utilization, and solving the problems of aluminum ash storage yards

Active Publication Date: 2019-12-17
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discarded aluminum ash is stored in the aluminum ash slag yard, which not only occupies the field, but also easily causes water and soil pollution

Method used

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  • Method of comprehensively utilizing aluminum dross to prepare anti-oxidation coating for carbon anode used for electrolytic aluminum
  • Method of comprehensively utilizing aluminum dross to prepare anti-oxidation coating for carbon anode used for electrolytic aluminum

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Preparation of carbon anode coating for electrolytic aluminum

[0050] 1) Accurately weigh the raw materials according to the following ratio:

[0051] 20 parts of aluminum ash, 5 parts of sodium hydroxide, 1 part of industrial aluminum powder, 1 part of sodium borate, 1 part of carboxymethyl cellulose, and 15 parts of water produced in the electrolytic aluminum process; the aluminum ash comes from an electrolytic The aluminum ash slag produced in the aluminum factory is obtained by grinding it through a 200-mesh sieve;

[0052] 2) Add the aluminum ash to the water, keep it warm at 75°C for 3 hours under stirring conditions, until no more ammonia gas is generated; during this period, the ammonia gas is collected; this step is the water immersion process of the aluminum ash, and the main purpose is to nitride Aluminum is converted to alumina;

[0053] 3) cooling the liquid material produced in step 2) to room temperature, filtering, moving the filtrate into ...

Embodiment 2

[0057] Embodiment 2: Preparation of carbon anode coating for electrolytic aluminum

[0058] 1) Accurately weigh the raw materials according to the following ratio:

[0059] 50 parts of aluminum ash, 10 parts of sodium hydroxide, 3 parts of industrial aluminum powder, 2 parts of sodium borate, 1 part of carboxymethyl cellulose, and 15 parts of water produced in the electrolytic aluminum process; the aluminum ash comes from an electrolysis plant in Binzhou City, Shandong Province The aluminum ash slag produced in the aluminum factory is obtained by grinding it through a 200-mesh sieve;

[0060] 2) Add the aluminum ash to the water, keep it warm at 100°C for 5 hours under stirring conditions, until no more ammonia gas is generated; during this period, the ammonia gas is collected; this step is the water immersion process of the aluminum ash, and the main purpose is to nitride Aluminum is converted to alumina;

[0061] 3) cooling the liquid material produced in step 2) to room t...

Embodiment 3

[0065] Embodiment 3: Preparation of carbon anode coating for electrolytic aluminum

[0066] 1) Accurately weigh the raw materials according to the following ratio:

[0067] 45 parts of aluminum ash, 15 parts of sodium hydroxide, 5 parts of industrial aluminum powder, 1 part of sodium borate, 3 parts of carboxymethyl cellulose, and 50 parts of water produced in the electrolytic aluminum process; the aluminum ash comes from an electrolytic company in Binzhou City, Shandong Province The aluminum ash slag produced in the aluminum factory is obtained by grinding it through a 200-mesh sieve;

[0068] 2) Add the aluminum ash to the water, keep it warm at 80°C for 10 hours under stirring conditions, until no more ammonia gas is produced; during this period, the ammonia gas is collected; this step is the water immersion process of the aluminum ash, and the main purpose is to nitride Aluminum is converted to alumina;

[0069] 3) cooling the liquid material produced in step 2) to room ...

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Abstract

The invention provides a method for comprehensively utilizing aluminum dross to prepare anti-oxidation coating for carbon anode used for electrolytic aluminum. Raw materials used in the method include, by weight, aluminum dross, strong base, aluminum powder, a boron compound, an organic adhesion promoter and water. The preparation method comprises the following concrete steps: adding the aluminumash into water, and maintaining the aluminum dross h at a certain temperature while stirring; collecting generated ammonia gas, cooling and filtering a liquid material, transferring a filtrate into evaporation equipment for evaporation and recovery of soluble chlorate in the filtrate, and collecting distilled water generated in the process of evaporation; adding a strong alkali to obtain an alkalisolution; adding filter residues obtained by filtering and the aluminum powder, carrying out stirring, and carrying out partial alkali dissolution to obtain an adhesive and a filler for the coating applied to the carbon anode for electrolytic aluminum; and finally, adding the boron compound and the organic adhesion promoter into the adhesive, and carrying out uniform mixing. According to the invention, the solid waste aluminum dross is used as the raw material for preparation of the anti-oxidation coating for the carbon anode used for electrolytic aluminum, so the aluminum dross can be comprehensively recycled, and the prepared coating enables the carbon anode for electrolytic aluminum to have high-temperature-resistant and anti-oxidation effects.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization and treatment of solid waste, and in particular relates to a method for comprehensively utilizing aluminum ash to prepare a carbon anode anti-oxidation coating for electrolytic aluminum. Background technique [0002] Aluminum ash mainly comes from aluminum production, consumption, waste aluminum recycling and other links. Aluminum ash produced during aluminum smelting is an industrial waste with large output and serious pollution. Aluminum ash is produced in the process of electrolytic production of alumina molten salt, and a certain amount of aluminum ash will also be produced due to the carrying of operating and measuring instruments, anode replacement, aluminum tapping, ingot casting, and electrolytic cell overhaul. Freshly released aluminum ash and aluminum slag contain a large amount of metallic aluminum, only part of which can be recycled, and the remaining waste aluminum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/61C09D7/65C25C3/12
CPCC09D1/00C09D7/61C09D7/65C09D5/18C25C3/125
Inventor 王丁王日昕
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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