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Method for preparing aluminum fluoride and aluminum oxide by decarburization and sodium removal of electrolytic aluminum carbon slag

A technology of electrolytic aluminum and aluminum fluoride, applied in chemical instruments and methods, preparation of aluminum fluoride, aluminum hydroxide, etc., can solve the problems of high production cost of aluminum fluoride, inability to realize harmless treatment of carbon powder, etc., and achieve Low production cost, easy industrial implementation, and high product purity

Pending Publication Date: 2021-03-26
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing aluminum fluoride and alumina by decarburization and desodiumization of electrolytic aluminum carbon slag, so as to solve the problem that the existing method cannot realize the harmless treatment of carbon powder and the production cost of aluminum fluoride is relatively high technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Break 1000g of carbon slag into fine particles below 3mm, analyze its C content to be 35.4%, add 35.4g of decarburizing agent (including 7.08g of engine oil, 28.32g of biochar), and mix well to obtain 1# mixture , put the 1# mixture into the high-temperature furnace, heat treatment at 700°C for 4h, carbon oxidation and combustion, and obtain about 645g of crude fluoride salt A.

[0029] (2) Crude fluoride salt A was ground, and its sodium content was analyzed to be 31.5%. Add 203g of aluminum sulfate and mix evenly to obtain 2# mixture. Put 2# mixture into a high-temperature furnace and heat treatment at 750°C for 3h , the crude fluoride salt A chemically reacts with the sodium-removing agent to obtain about 848 g of crude fluoride salt B.

[0030] (3) Add crude fluoride salt B to the stirring tank, add 2544g industrial pure water to fully dissolve the sodium salt into the water, and separate solid and liquid to obtain about 374g of precipitate C and sodium salt sol...

Embodiment 2

[0034] (1) Break 1000g of carbon slag into fine particles below 3mm, analyze its C content as 30.5%, add 91.5g of decarburizing agents (including 64.05g of engine oil, 27.45g of starch), and mix evenly to obtain 1# mixture. The 1# mixture was put into a high-temperature furnace, heat-treated at 745°C for 3 hours, and carbon oxidized and burned to obtain about 695g of crude fluoride salt A.

[0035] (2) Grind the crude fluoride salt A and analyze its sodium content to be 33.0%. Add about 460g of aluminum acetate and mix evenly to obtain the 2# mixture. Put the 2# mixture into the high-temperature furnace and heat treatment at 790°C After 1 hour, the crude fluoride salt A reacts with the sodium-removing agent to obtain about 1150 g of crude fluoride salt B.

[0036] (3) Put the crude fluoride salt B into the stirring tank, add 2300g of industrial pure water to fully dissolve the sodium salt into the water, and separate the solid and liquid to obtain about 510g of precipitate C a...

Embodiment 3

[0040] (1) Break 1000g of carbon slag into fine particles below 3mm, analyze its C content as 38.0%, add 190g of decarburizing agents (including 76g of starch and 114g of biochar), and mix well to obtain 1# mixture. # Add the mixture to a high-temperature furnace, heat it at 790°C for 2 hours, and burn it by carbon oxidation to obtain about 620g of crude fluoride salt A.

[0041] (2) Crude fluoride salt A was ground, and its sodium content was analyzed to be 32.3%. Add 600g of aluminum oxalate and mix evenly to obtain 2# mixture. Put 2# mixture into a high-temperature furnace and heat treatment at 770°C for 2 hours , the crude fluoride salt A chemically reacts with the sodium-removing agent to obtain about 1220 g of crude fluoride salt B.

[0042] (3) Add the crude fluoride salt B to the stirring tank, add 6100g of industrial pure water to fully dissolve the sodium salt into the water, and separate the solid and liquid to obtain about 680g of precipitate C and sodium salt solu...

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Abstract

The invention belongs to the technical field of electrolytic aluminum burner carbon slag recycling, and discloses a method for preparing aluminum fluoride and aluminum oxide by decarburization and sodium removal of electrolytic aluminum carbon slag. The method comprises the following steps: crushing electrolytic aluminum carbon slag into fine particles with the particle size of less than 3 mm, adding a decarburization agent into the carbon slag, uniformly mixing to obtain a 1# mixture, adding the 1# mixture into a high-temperature furnace, and carrying out I-section heating treatment in an airatmosphere to obtain crude fluoride salt A; adding a sodium removal agent into the crude fluoride salt A, uniformly mixing to obtain a 2# mixture, adding the 2# mixture into a high-temperature furnace, and carrying out II-stage heating treatment to obtain crude fluoride salt B; adding the crude fluoride salt B into a stirring tank, adding industrial pure water to fully dissolve sodium salt into water, and carrying out solid-liquid separation to obtain a precipitate C and a sodium salt solution D; and drying the precipitate C to obtain aluminum fluoride and aluminum oxide products. According to the invention, the whole technological process is free of waste residues and waste water, the decarburization agent and the sodium removal agent are wide in source, the production cost is low, and industrial implementation is easy.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of electrolytic aluminum fire eye carbon slag, and in particular relates to a method for preparing aluminum fluoride and aluminum oxide by decarburizing and desodiumizing electrolytic aluminum carbon slag. Background technique [0002] During the aluminum electrolytic production process, due to the selective oxidation of the carbon anode, the unburned aggregate particles fall off the surface of the anode and fall into the electrolytic cell, and then enter the electrolyte solution to form carbon slag. The carbon slag is soaked in the electrolyte for a long time, and its micropores are filled with electrolyte. The carbon slag contains about 30% carbon powder and about 70% fluoride salt, which is a secondary fluorine resource with high added value. At present, the industry mainly adopts flotation or incineration to separate the carbon and fluoride salts in the carbon slag to obtain c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50C01F7/44C01F7/36C01F7/32C01F7/30C01F7/441
CPCC01F7/50C01F7/441C01F7/36C01F7/32C25C3/22C01P2006/80C01F7/30
Inventor 陈喜平
Owner ZHENGZHOU UNIV
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