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Method for producing cryolite by wast liquid of vacuum residues in aluminium industry

A cryolite and waste liquid technology, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of increased treatment cost, expensive treatment cost, waste of aluminum resources, etc. Effect

Inactive Publication Date: 2018-05-22
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] 2.1. Extrusion mold waste liquid waste water waste residue
One is to discharge it directly into the wastewater treatment center, which not only increases the treatment cost, but also wastes aluminum resources; the other is to ask a professional treatment factory to pull it away
If these treatment plants treat a large amount of mold-burning waste lye individually, they will consume a large amount of acid, and the society will pay high processing costs for this.

Method used

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  • Method for producing cryolite by wast liquid of vacuum residues in aluminium industry
  • Method for producing cryolite by wast liquid of vacuum residues in aluminium industry
  • Method for producing cryolite by wast liquid of vacuum residues in aluminium industry

Examples

Experimental program
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Effect test

Embodiment 1

[0158] Get the mold waste liquid and detect, total alkali 5.995 equivalents, free alkali 3.060 equivalents, Al 3+ 2.935 equivalent; take hydrofluoric acid solution for detection, the content is 33.93 equivalent, and the density is 1.22g / m 3 .

[0159] Experiment with the following calculations:

[0160] According to HF (equivalent) / Al 3+ (equivalent)=2.30 times design, after fluoride ion and aluminum ion have reacted, also remaining part fluoride ion, produces sodium fluoride; At this moment, the hydrofluoric acid that needs to add is:

[0161] 2.3 × 2.935 = 6.751 equivalents, which is greater than 5.995 equivalents of the total alkali of potting mold waste liquid. After adding hydrofluoric acid, the reaction solution is acidic.

[0162] The specific operation steps of the method for producing cryolite from the waste liquid of the aluminum industry slag reduction of the present embodiment are:

[0163] (1), adding hydrofluoric acid to the mold waste liquid to synthesize cr...

Embodiment 2

[0170] Choose hydrofluoric acid, content 33.93 equivalent, density 1.22g / m 3 , the experiment is calculated as follows:

[0171] Take 10ml of hydrofluoric acid, titrate with the oxidation line alkali etching waste liquid containing sodium metaaluminate and sodium hydroxide, consume 50ml of waste liquid, it is neutral at this time, need to add excess hydrofluoric acid, produce ice crystals under acidic conditions Stone, get hydrofluoric acid addition to be 1.15 times of reacting to neutrality:

[0172] According to the titration results, when 1000ml of waste liquid is added to 200ml of hydrofluoric acid, the reaction solution is neutral, and 1.16 times of hydrofluoric acid is actually added:

[0173] 200×1.16=232ml,

[0174] After the addition of hydrofluoric acid, the reaction solution is acidic and reaches the end point of the cryolite reaction.

[0175] The specific operation steps are:

[0176] a. Add hydrofluoric acid to the waste liquid to synthesize cryolite. Take 1...

Embodiment 3

[0189] Choose hydrofluoric acid, content 33.93 equivalent, density 1.22g / m 3 , the experiment is calculated as follows:

[0190] Take 10ml of hydrofluoric acid, titrate with the alkaline solution of aluminum ash containing sodium metaaluminate and sodium hydroxide, and consume 49ml of waste liquid, which is neutral at this time, and excess hydrofluoric acid needs to be added to produce ice crystals under acidic conditions Stone, get hydrofluoric acid addition to be 1.15 times of reacting to neutrality:

[0191] According to the titration results, when 1000ml of waste liquid is added to 204ml of hydrofluoric acid, the reaction solution is neutral, and 1.18 times of hydrofluoric acid is actually added:

[0192] 204×1.18=240ml,

[0193] After the addition of hydrofluoric acid, the reaction solution is acidic and reaches the end point of the cryolite reaction.

[0194] The specific operation steps are:

[0195] a. Add hydrofluoric acid to the waste liquid to synthesize cryolit...

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Abstract

The invention discloses a method for producing cryolite by wast liquid of vacuum residues in the aluminium industry. The waste liquid is alkali bath solution which is generated by utilizing sodium hydroxide to dissolve aluminium and contains sodium metaaluminate; a fluorine-containing acid compound and sodium carbonate are added in the waste liquid to produce the cryolite. According to the methoddisclosed by the invention, aluminium ions in the waste liquid can be sufficiently recycled and converted into the industrial cryolite, wastes are changed into treasure and high-value resource utilization of waste aluminium is implemented; sodion in the waste liquid is sufficiently utilized so as to greatly reduce cost of sodium hydroxide; aluminium and alkali in the waste liquid are sufficientlyrecycled, and zero discharge of wastewater and waste residues in a die repairing workshop is implemented.

Description

technical field [0001] The invention relates to the technical field of aluminum industry wastewater treatment, in particular to a method for producing cryolite from waste liquid of aluminum industry slag reduction. Background technique [0002] Aluminum and aluminum alloys have the advantages of excellent processing performance, good corrosion resistance, beautiful surface, high recovery rate, etc., and have been widely used in construction, transportation, machinery, electric power and other industries. In recent years, the trend of expanding the application of aluminum by replacing steel with aluminum has become more obvious . The aluminum processing industry is a traditional industry, and it is a sunrise industry full of vitality. According to statistics, the per capita annual consumption of aluminum in developed countries in Europe and the United States is more than 32kg, while the per capita consumption in my country is only about 13kg, which is only about one-third of...

Claims

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Application Information

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IPC IPC(8): C01F7/54
CPCC01F7/54C01P2006/80
Inventor 熊映明
Owner FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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