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Process for preparing kryocide

A production method and cryolite technology, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of high production cost, environmental pollution, and different degrees, and achieve the effects of low cost, alleviating environmental pollution problems, and reducing dependence.

Inactive Publication Date: 2008-12-10
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional production process of cryolite is fluoroaluminic acid soda ash method, as well as clay brine method, sodium fluorosilicate method, hydrofluoric acid, sodium aluminate method, etc. These methods all need to occupy a certain amount of fluorine resources, and the production cost is relatively high. Moreover, the current processes all have different degrees of environmental pollution problems.

Method used

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  • Process for preparing kryocide
  • Process for preparing kryocide
  • Process for preparing kryocide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Production method of the present invention is:

[0026] (1) Pull out the carbon slag from the electrolytic cell, break it after cooling, then crush it to 3mm with a pair of rollers, and then grind it to the most suitable particle size for flotation with a ball mill, i.e. 0.45-0.76mm;

[0027] (2) Add a mixing drum, which contains flotation reagents, and the ground carbon residue and the reagents are fully stirred in the mixing drum;

[0028] (3) After stirring, it enters the flotation machine. There are two kinds of carbon slag flotation products, namely electrolyte containing a small amount of carbon and carbon powder containing a small amount of electrolyte. The electrolyte containing a small amount of carbon is further finely processed to prepare cryolite, which contains a small amount of carbon. The carbon powder of the electrolyte is used to prepare carbon, etc.;

[0029] (4) Fine product processing

[0030] ①Electrolyte containing about 5% carbon: Before it is u...

Embodiment 2

[0034] Production method of the present invention is:

[0035] (1) Pull out the carbon slag from the electrolytic cell, break it after cooling, then crush it to 3mm with a pair of rollers, and then grind it to the most suitable particle size for flotation with a ball mill, i.e. 0.45-0.76mm;

[0036] (2) Add a mixing drum, which contains flotation reagents, and the ground carbon residue and the reagents are fully stirred in the mixing drum;

[0037] (3) After stirring, it enters the flotation machine. There are two kinds of carbon slag flotation products, namely electrolyte containing a small amount of carbon and carbon powder containing a small amount of electrolyte. The electrolyte containing a small amount of carbon is further finely processed to prepare cryolite, which contains a small amount of carbon. The carbon powder of the electrolyte is used to prepare carbon, etc.;

[0038] (4) Fine product processing

[0039] ①Electrolyte containing about 5% carbon: Before it is u...

Embodiment 3

[0043] Production method of the present invention is:

[0044] (1) Pull out the carbon slag from the electrolytic cell, break it after cooling, then crush it to 3mm with a pair of rollers, and then grind it to the most suitable particle size for flotation with a ball mill, i.e. 0.45-0.76mm;

[0045] (2) Add a mixing drum, which contains flotation reagents, and the ground carbon residue and the reagents are fully stirred in the mixing drum;

[0046] (3) After stirring, it enters the flotation machine. There are two kinds of carbon slag flotation products, namely electrolyte containing a small amount of carbon and carbon powder containing a small amount of electrolyte. The electrolyte containing a small amount of carbon is further finely processed to prepare cryolite, which contains a small amount of carbon. The carbon powder of the electrolyte is used to prepare carbon, etc.;

[0047] (4) Fine product processing

[0048] ①Electrolyte containing about 5% carbon: Before it is u...

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Abstract

The invention relates to a method for producing cryolite, which takes carbon residue of aluminum factories and sodium bifluoride as raw materials which are then reacted with each other in a solid phase. The raw materials of the method adopt a great deal of waste residue - the carbon residue of the electrolytic aluminum factories, and the cryolite product is prepared after flotation treatment and particularly refining treatment of products. The method increases a source of raw materials for producing villiaumite, relieves the dependency on fluorite, saves a large number of valuable resources, has low cost, greatly reduces the production cost, and relieves the ambient environmental pollution problem. Moreover, carbon powder containing about 10 percent of electrolyte obtained after flotationof the carbon residue can be dried and then used as auxiliary materials to be added when bottom paste is manufactured, and used for building a novel groove. Products generated during the reaction process of the method can be recycled, thereby the method greatly reduces the production cost to a certain degree, has good social benefit and economic benefit, and is easy to promote and apply.

Description

technical field [0001] The invention relates to a method for producing cryolite, in particular to a method for producing cryolite by using carbon slag produced by electrolytic aluminum and sodium bifluoride as raw materials. Background technique [0002] Cryolite is an alkali metal fluoroaluminate, also known as sodium fluoroaluminate, its molecular formula is Na 3 AlF 6 ; Natural cryolite is a monoclinic prismatic crystal, colorless, due to the influence of impurities, it is often off-white, light yellow or reddish, sometimes black. It often appears as an indivisible dense block with glass luster. Slightly soluble in water, showing an acidic reaction, it will decompose when it encounters sulfuric acid. As a chemical product, cryolite is mainly used as a flux for smelting metal aluminum, and can also be used as an insecticide for crops, an enamel opalescent agent, a sunscreen and flux for glass and enamel production, and a wear-resistant filler for resin rubber. , can al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
Inventor 皇甫根利秦俊光刘海霞郝义峰张良
Owner DO FLUORIDE CHEM CO LTD
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