CN1868888A - Method of producing cryolite - Google Patents
Method of producing cryolite Download PDFInfo
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- CN1868888A CN1868888A CN 200510017595 CN200510017595A CN1868888A CN 1868888 A CN1868888 A CN 1868888A CN 200510017595 CN200510017595 CN 200510017595 CN 200510017595 A CN200510017595 A CN 200510017595A CN 1868888 A CN1868888 A CN 1868888A
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- cryolite
- slurry
- sodium aluminate
- reaction
- fluoroaluminate
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Abstract
A process for preparing cryolite A process for preparing cryolite from ammonium fluoroaluminate, aluminum chloride and sodium chloride includes such steps as preparing slurry of ammonium fluoroaluminate and the aqueous solution of sodium chloride, adding aluminum chloride to said aqueous solution to obtain mixed solution, adding it to said slurry, reaction, filtering, washing, filtering, washing and drying. Preparing the slurry of ammonium fluoroaluminate, preparing sodium aluminate solution, adding it to said slurry at 80-100 deg.C, reaction, filtering, and calcining.
Description
Technical Field
The invention relates to a method for producing cryolite, which takes aluminum profile surface treatment waste residue, namely ammonium fluoroaluminate and sodium aluminate as raw materials.
Background
The cryolite is named sodium fluoroaluminate in chemical name and has the molecular formula of Na3AlF6It is mainly used as fluxing agent for aluminium electrolysis, wear-resisting filler for rubber and grinding wheel, opalescent agent for enamel, light-shading agent for glass and metal flux, etc. The traditional production process of cryolite is a fluoroaluminate soda ash method, and in addition, a clay bittern method, a sodium fluosilicate method, a hydrofluoric acid sodium aluminate method and the like exist, and the methods all have the problem of relatively high manufacturing cost.
Disclosure of Invention
The invention aims to provide a method for producing cryolite, which greatly reduces the production cost, fully utilizes waste residues of surface treatment of aluminum profiles and realizes changing waste into valuables.
In order to realize the aim, the technical scheme of the invention is to adopt a method for producing cryolite, ammonium fluoroaluminate is prepared into slurry with the concentration of 15-45%, and the slurry is prepared into α according to the molecular ratio n of the generated cryolitekSodium aluminate solution of value; heating the ammonium fluoroaluminate slurry to 80-100 ℃, and then uniformly adding the prepared sodium aluminate solution into the ammonium fluoroaluminate slurry to react for 1-2 hours; after the feeding is finished, continuing to react for 15-30 minutes, and keeping the temperature at 80-100 ℃ in the whole reaction process; after the reaction is finished, filtering; calcining the filtered ointment at the temperature of 400-600 ℃ to obtain the cryolite product.
The granularity of the ammonium fluoroaluminate is 150-300 meshes.
N is the molecular ratio of cryolite and is 1-3, wherein n is not equal to 3, αkα for sodium aluminatekValue of sodium aluminate αkThe value is α in relation to the molecular ratio of cryolitek＝6n÷(3-n)。
The reaction formula of the invention is as follows:
in the formula, n: the molecular ratio of cryolite is shown, n is between 1 and 3, and n is not equal to 3;
αkα for sodium aluminatekA value;
α of sodium aluminatekThe value is related to the molecular ratio of cryolite:
αk＝6n÷(3-n)
because the method of the invention takes the waste residue of the surface treatment of the aluminum profile, namely the ammonium fluoroaluminate, as the main raw material, the production cost is lower; in addition, the method has simple process and easy control; the most important point is that the invention solves the problem of environmental pollution caused by long-term overstock of ammonium fluoroaluminate waste and realizes changing waste into valuable.
Detailed Description
Example 1
Ammonium fluoroaluminate having a particle size of 200 mesh was prepared into a slurry having a concentration of 15%, and the molecular ratio n to cryolite was 1.5 to αkA sodium aluminate solution with a value of 6; heating the ammonium fluoroaluminate slurry to 90 ℃, and uniformly adding the sodium aluminate solution into the ammonium fluoroaluminate slurry for reaction; after the addition of the materials, the reaction was continued for 25 minutes, and the temperature was maintained at 90 ℃ throughout the reaction. After the reaction is finished, filtering can be started, and the filtered ointment is calcined at 500 ℃ to obtain the cryolite product.
Example 2
Ammonium fluoroaluminate with a particle size of 150 meshes is prepared into slurry with a concentration of 25%, and the slurry is prepared into α according to the molecular ratio n of generated cryolite to 2kA sodium aluminate solution with a value of 12; heating ammonium fluoroaluminate slurry to 100 ℃, and uniformly adding a sodium aluminate solution into the ammonium fluoroaluminate slurry for reaction; after the addition of the materials, the reaction was continued for 15 minutes, and the temperature was maintained at 100 ℃ throughout the reaction. After the reaction is finished, filtering can be started, and the filtered ointment is calcined at 600 ℃ to obtain the cryolite product.
Example 3
Ammonium fluoroaluminate having a particle size of 300 mesh was prepared into slurry having a concentration of 45%, and the molecular ratio n to cryolite was calculated from 2.5 to αkA sodium aluminate solution with a value of 30; heating ammonium fluoroaluminate slurry to 80 ℃, and uniformly adding the sodium aluminate solution into the ammonium fluoroaluminate slurry for reaction; after the addition of the materials, the reaction was continued for 15 minutes, and the temperature was maintained at 80 ℃ throughout the reaction. After the reaction is completed, filtration can be started. Calcining the filtered ointment at 400 ℃ to obtain the cryolite product.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (3)
1. A process for preparing cryolite features that the ammonium fluoroaluminate is prepared into slurry with 15-45% concentration, which is prepared into α% according to the molecular ratio n of generated cryolitekSodium aluminate solution of value; heating the ammonium fluoroaluminate slurry to 80-100 ℃, and then uniformly adding the prepared sodium aluminate solution into the ammonium fluoroaluminate slurry to react for 1-2 hours; after the feeding is finished, continuing to react for 15-30 minutes, and keeping the temperature at 80-100 ℃ in the whole reaction process; after the reaction is finished, filtering; calcining the filtered ointment at the temperature of 400-600 ℃ to obtain the cryolite product.
2. A process for producing cryolite according to claim 1 wherein: the granularity of the ammonium fluoroaluminate is 150-300 meshes.
3. The process for preparing cryolite according to claim 2, wherein n is the molecular ratio of cryolite, n is 1-3, n ≠ 3, αkα for sodium aluminatekValue of sodium aluminate αkThe value is α in relation to the molecular ratio of cryolitek＝6n÷(3-n)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100175952A CN100360416C (en) | 2005-05-23 | 2005-05-23 | Method of producing cryolite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100175952A CN100360416C (en) | 2005-05-23 | 2005-05-23 | Method of producing cryolite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1868888A true CN1868888A (en) | 2006-11-29 |
| CN100360416C CN100360416C (en) | 2008-01-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100175952A Expired - Fee Related CN100360416C (en) | 2005-05-23 | 2005-05-23 | Method of producing cryolite |
Country Status (1)
| Country | Link |
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| CN (1) | CN100360416C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264919B (en) * | 2008-04-23 | 2010-06-02 | 河南未来铝业（集团）有限公司 | Cosmetics-stage cryolite and producing technique thereof |
| CN105502451A (en) * | 2015-12-29 | 2016-04-20 | 湖北祥福化工科技有限公司 | Method for producing aluminum fluoride and co-produced high-molecular ratio cryolite |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU431113A1 (en) * | 1970-04-20 | 1974-06-05 | В. Г. Морозов, О. С. Игнатьев, И. А. Варлаков , В. Н. Коровин Институт химии , технологии резких элементов , минерального | METHOD OF OBTAINING FLUORINE ALUMINUM |
| US3816591A (en) * | 1972-05-05 | 1974-06-11 | Oesterr Stickstoffwerke Ag | Process for the recovery of aluminium and fluorine from a dilute aqueous solution |
| CN1194897C (en) * | 2002-05-10 | 2005-03-30 | 焦作市多氟多化工有限公司 | Method for producing cryolite |
| CN1203000C (en) * | 2002-10-23 | 2005-05-25 | 赵小春 | Method for producing cryolite |
| JP2004313657A (en) * | 2003-04-21 | 2004-11-11 | Ge Medical Systems Global Technology Co Llc | Radiation calculated tomographic image apparatus |
-
2005
- 2005-05-23 CN CNB2005100175952A patent/CN100360416C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264919B (en) * | 2008-04-23 | 2010-06-02 | 河南未来铝业（集团）有限公司 | Cosmetics-stage cryolite and producing technique thereof |
| CN105502451A (en) * | 2015-12-29 | 2016-04-20 | 湖北祥福化工科技有限公司 | Method for producing aluminum fluoride and co-produced high-molecular ratio cryolite |
| CN105502451B (en) * | 2015-12-29 | 2018-01-09 | 湖北祥福化工科技有限公司 | A kind of method for producing aluminum fluoride coproduction cryolite with high molecular ratio |
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| Publication number | Publication date |
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| CN100360416C (en) | 2008-01-09 |
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Granted publication date: 20080109 Termination date: 20120523 |