CN1277747C - Method for producing aluminum fluoride - Google Patents
Method for producing aluminum fluoride Download PDFInfo
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- CN1277747C CN1277747C CN 200310110212 CN200310110212A CN1277747C CN 1277747 C CN1277747 C CN 1277747C CN 200310110212 CN200310110212 CN 200310110212 CN 200310110212 A CN200310110212 A CN 200310110212A CN 1277747 C CN1277747 C CN 1277747C
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- aluminum fluoride
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- kaolinite
- fluoride
- aluminum
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Abstract
The present invention relates to a method for producing aluminium fluoride, which comprises the following steps: hydrofluoric acid and montmorillonite as raw materials react with each other at a temperature of 80 to 100 DEG C and for 10 to 30 minutes, and a final reaction pH value is controlled between 1 and 4; an aluminium fluoride solution is obtained as a filtrate by sufficiently filtering and properly washing the montmorillonite slag after the reaction; then the aluminium fluoride solution is crystallized to obtain trihydrated aluminum fluoride; the trihydrated aluminum fluoride is dried and dewatered to obtain the product of aluminum fluoride. The raw materials of the aluminum fluoride produced by the method of the present invention are the montmorillonite which replaces aluminum hydroxide. The montmorillonite of China is rich in reserves and easy for exploitation, and price is far lower than that of the aluminum hydroxide. Compared with a traditional method, the technology for producing aluminum fluoride of the present invention can reduce cost by 600 to 800 yuan per ton. The present invention has the advantages of great reduction of production cost and favorable popularization value.
Description
Technical Field
The invention relates to a method for producing aluminum fluoride.
Background
The aluminum fluoride is used as an auxiliary agent in the production of electrolytic aluminum, and is used for reducing the melting point of the electrolyte and improving the conductivity of the electrolyte. The traditional production process comprises hydrofluoric acid-dry method and hydrofluoric acid-wet method. The hydrofluoric acid-dry process uses hydrogen fluoride and aluminum hydroxide as raw materials, and comprises pretreating aluminum hydroxide to remove crystal water, mixing the powder with hydrogen fluoride gas at 500-600 deg.C to obtain aluminum trifluoride, and cooling in a drum. Hydrofluoric acid-wet process uses hydrofluoric acid and aluminium hydroxide as raw materials, and the production process comprises reacting hydrofluoric acid with aluminium hydroxide slurry, crystallizing to obtain aluminium fluoride trihydrate, and drying and dehydrating to obtain aluminium fluoride product. The production process has high raw material price, high production cost, large investment of dry process equipment and complex process.
Disclosure of Invention
The invention aims to provide a method for producing aluminum fluoride, which is used for reducing the cost.
The chemical reaction formula of the invention is as follows:
in order to achieve the purpose, the technical scheme of the invention is to adopt a production method of aluminum fluoride, which comprises the following steps: the method comprises the steps of taking hydrofluoric acid and kaolinite as raw materials, reacting at the reaction temperature of 80-100 ℃ for 10-30 minutes, controlling the pH value of the reaction end point to be 1-4, fully filtering and washing the kaolinite residue in a proper amount after the reaction is finished, obtaining a filtrate which is an aluminum fluoride solution, crystallizing the aluminum fluoride solution to obtain aluminum fluoride trihydrate, and drying and dehydrating to obtain an aluminum fluoride product.
The mass percentage of the kaolinite in the reaction liquidis 20-40%.
The kaolinite is crushed to 100-200 meshes and calcined at the temperature of 600-800 ℃ for 1-2 hours.
The alumina content in the kaolinite is 35-50%.
The concentration of the hydrofluoric acid is 20-40%.
The raw material for producing the aluminum fluoride by the method is kaolinite instead of aluminum hydroxide, the kaolinite in China has abundant reserves, is easy to extract and has far lower price than the aluminum hydroxide. Compared with the traditional method, the process for producing the aluminum fluoride can reduce the cost by 600-800 yuan/ton, greatly reduce the production cost and have good popularization and application values.
Table 1 shows the comparison of the national standard with the product of the invention in terms of various performance parameters
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
Example 1
The method for producing aluminum fluoride of the present invention is as follows: heating 500g of 30% hydrofluoric acid to 60 ℃, reacting with 560g of calcined kaolinite, adding 560g of water in the reaction process, reacting at 85 ℃ for 15 minutes, controlling the pH value at the end of the reaction to be 1.5, fully filtering and washing kaolinite residues after the reaction is finished, obtaining a filtrate which is an aluminum fluoride solution, crystallizing the aluminum fluoride solution to obtain aluminum fluoride trihydrate, and drying and dehydrating to obtain an aluminum fluoride product.
Example 2
The method for producing aluminum fluoride of this example is as follows: firstly heating 750g of 20% hydrofluoric acid to 70 ℃, then reacting with 550g of calcined kaolinite, adding 310g of water, reacting at 90 ℃ for 20 minutes, controlling the pH value at the end of the reaction to be 2.0, filtering and washing the kaolinite residue after the reaction is finished, obtaining a filtrate which is an aluminum fluoride solution, crystallizing the aluminum fluoride solution to obtain aluminum fluoride trihydrate, and drying and dehydrating to obtain an aluminum fluoride product.
Example 3
The method for producing aluminum fluoride of this example is as follows: 375g of hydrofluoric acid with the concentration of 20 percent and 370g of calcined kaolinite are reacted, 500g of water is added in the reaction process, the reaction temperature is 95 ℃, the reaction time is 25 minutes, the pH value of the reaction end point is controlled to be 3.0, after the reaction is finished, kaolinite residues are filtered and washed, the obtained filtrate is an aluminum fluoride solution, then the aluminum fluoride solution is crystallized to obtain aluminum fluoride trihydrate, and the aluminum fluoride product is prepared after drying and dehydration.
Claims (1)
1. A method for producing aluminum fluoride is characterized in that: the method comprises the following steps: taking hydrofluoric acid and kaolinite with the alumina content of 35-50% as raw materials, reacting at the reaction temperature of 80-100 ℃ for 10-30 minutes, controlling the pH value at the end of the reaction to be 1-4, fully filtering and washing kaolinite residues in a proper amount after the reaction is finished, taking the obtained filtrate as an aluminum fluoride solution, crystallizing the aluminum fluoride solution to obtain aluminum fluoride trihydrate, and drying and dehydrating to obtain an aluminum fluoride product; wherein the mass percentage of the kaolinite in the reaction liquid is 20-40%, the kaolinite is crushed to 100-200 meshes, and the kaolinite is calcined for 1-2 hours at the temperature of 600-800 ℃; in the reaction, the concentration of the hydrofluoric acid is 20-40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110212 CN1277747C (en) | 2003-12-12 | 2003-12-12 | Method for producing aluminum fluoride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110212 CN1277747C (en) | 2003-12-12 | 2003-12-12 | Method for producing aluminum fluoride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1626444A CN1626444A (en) | 2005-06-15 |
| CN1277747C true CN1277747C (en) | 2006-10-04 |
Family
ID=34759087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310110212 Expired - Fee Related CN1277747C (en) | 2003-12-12 | 2003-12-12 | Method for producing aluminum fluoride |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1277747C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134590B (en) * | 2006-09-01 | 2010-08-18 | 多氟多化工股份有限公司 | Method for producing aluminun fluoride with combined production of white carbon black and ammonia sulfate |
| CN103936044B (en) * | 2014-02-26 | 2015-09-23 | 贵州天合国润高新材料科技有限公司 | Prepare efficient circulation in the process of aluminum contained compound and utilize the method for fluorochemical |
| CN114984902B (en) * | 2022-05-23 | 2023-04-28 | 中南大学 | Calcium magnesium aluminum ternary fluoride and preparation method and application thereof |
-
2003
- 2003-12-12 CN CN 200310110212 patent/CN1277747C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1626444A (en) | 2005-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: FLUORINE CHEMICAL CO., LTD. Free format text: FORMER NAME OR ADDRESS: DUOFUDUO CHEMICAL INDUSTRY CO., LTD., JIAOZUO CITY |
|
| CP03 | Change of name, title or address |
Address after: 454191 Henan Province, Jiaozuo City Station area coke Rd Patentee after: Duo-fluoride Chemicals Co., Ltd. Address before: 454191, Feng County, Henan Province, Jiaozuo Feng Feng Chemical Industry Zone Patentee before: Duofuduo Chemical Industry Co., Ltd., Jiaozuo City |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061004 Termination date: 20121212 |