CN116924443A - Process for preparing aluminum hydroxide by breaking through aluminum-silicon ratio of raw materials - Google Patents
Process for preparing aluminum hydroxide by breaking through aluminum-silicon ratio of raw materials Download PDFInfo
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- CN116924443A CN116924443A CN202311026360.4A CN202311026360A CN116924443A CN 116924443 A CN116924443 A CN 116924443A CN 202311026360 A CN202311026360 A CN 202311026360A CN 116924443 A CN116924443 A CN 116924443A
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- China
- Prior art keywords
- aluminum
- raw materials
- breaking
- aluminum hydroxide
- silicon ratio
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 41
- 239000002994 raw material Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 15
- 239000011449 brick Substances 0.000 claims abstract description 14
- 239000008188 pellet Substances 0.000 claims abstract description 14
- 239000000292 calcium oxide Substances 0.000 claims abstract description 13
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000007791 liquid phase Substances 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000010000 carbonizing Methods 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000008236 heating water Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 11
- 238000003763 carbonization Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 239000010881 fly ash Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 5
- 229910001388 sodium aluminate Inorganic materials 0.000 description 5
- 238000004131 Bayer process Methods 0.000 description 3
- 229910001570 bauxite Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000012796 inorganic flame retardant Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/141—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
- C01F7/142—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent with carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/0693—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process from waste-like raw materials, e.g. fly ash or Bayer calcination dust
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials. The method comprises the following steps: crushing and grinding an aluminum-containing raw material and quicklime, uniformly mixing the raw material with industrial alkali, adding water into the obtained mixture to prepare bricks or pellets, and sequentially drying and sintering; cooling the sintered clinker, crushing and grinding again, heating water, stirring and dissolving out, separating solid from liquid, and collecting a liquid phase; carbonizing the liquid phase under heating, separating solid from liquid, washing, drying and bagging; wherein the content of aluminum oxide in the aluminum-containing raw material is more than or equal to 35 percent. The method can be widely applied to the extraction of aluminum hydroxide by taking waste and idle low-grade aluminum ores in China as raw materials, can also be applied to the preparation of aluminum hydroxide by taking aluminum-containing coal gangue, fly ash, argil ore and the like as raw materials, has the advantage of high aluminum extraction rate, and reduces the quicklime consumption by nearly half compared with the traditional process, thereby saving the production cost.
Description
Technical Field
The embodiment of the invention relates to the technical field of aluminum hydroxide preparation, in particular to a process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials.
Background
Aluminum hydroxide is the most widely used inorganic flame retardant additive. Aluminum hydroxide can not only resist flame, but also prevent smoke generation, no dripping and no toxic gas, so that the aluminum hydroxide can be widely applied and the use amount is increased year by year. The application range is as follows: thermoset plastics, thermoplastic plastics, synthetic rubber, paint, building materials and other industries. Meanwhile, aluminum hydroxide is also a basic raw material of aluminum fluoride necessary for the electrolytic aluminum industry, and is widely applied in the industry.
The industrial production method of aluminium hydroxide adopts Bayer process. The main processes of the bayer process are: and (3) reacting alkali with alumina to generate soluble sodium aluminate, stirring and decomposing the cooled sodium aluminate solution, and filtering and separating to obtain an aluminum hydroxide product. The Bayer process is to use high grade aluminum ore with aluminum-silicon ratio (Al 2 O 3 /SiO 2 ) Generally greater than 7, the raw materials are scarce and expensive, resulting in high production costs.
Disclosure of Invention
Therefore, the embodiment of the invention provides a process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
according to a first aspect of embodiments of the present invention, the present invention provides a process for preparing aluminum hydroxide by breaking through a raw material aluminum-silicon ratio, the process comprising the steps of:
crushing and grinding an aluminum-containing raw material and quicklime, uniformly mixing the raw material with industrial alkali, adding water into the obtained mixture to prepare bricks or pellets, and sequentially drying and sintering;
cooling the sintered clinker, crushing and grinding again, heating water, stirring and dissolving out, separating solid from liquid, and collecting a liquid phase;
carbonizing the liquid phase under heating, separating solid from liquid, washing, drying and bagging;
wherein the content of aluminum oxide in the aluminum-containing raw material is more than or equal to 35 percent.
Further, the mass of the quicklime and the aluminum-containing raw materials is 1 to 1.3:1.
further, the amount of industrial alkali used per ton of aluminum-containing raw material is 200 kg-500 kg.
Further, in the step of adding water to make bricks or pellets, the addition amount of water is 10% -15% of the mass of the mixture, so as to be capable of binding.
Further, the temperature of the drying is 100-300 ℃; the sintering temperature is 750-1200 ℃ and the sintering time is 1-5 hours.
Further, the grain size of the crushed and ground material is 325-5000 meshes.
Further, the temperature of the hot water is 55-100 ℃.
Further, the carbonization temperature is 55-85 ℃.
Further, hot water with the temperature of more than or equal to 30 ℃ is adopted for washing.
The embodiment of the invention has the following advantages:
the invention breaks through the conventional high aluminum-silicon ratio, the technology can be widely applied to the preparation of aluminum hydroxide by taking the waste and idle low-grade aluminum ore in China as a raw material, and can also be applied to the preparation of aluminum hydroxide by taking aluminum-containing coal gangue, fly ash and argil ore as raw materials, and the invention has the advantage of high aluminum extraction rate, and meanwhile, the quicklime consumption of the invention is reduced by nearly half compared with the traditional technology, and the production cost is saved.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The present example provides a process for preparing aluminum hydroxide:
the aluminum-containing raw material is bauxite, the content of aluminum oxide is 50 percent, and the content of silicon dioxide is 45 percent.
Bauxite and quicklime are respectively crushed and ground into particles with the particle size of 325 meshes to 5000 meshes, 1 ton of bauxite, 1 ton of quicklime and 400 kg of industrial alkali are mixed, and after uniform stirring, 240 kg of water is added to prepare bricks or pellets, the bricks or pellets are dried at 140 ℃ to ensure that the water content of the bricks or pellets is lower than 5%, and then are sintered, wherein the sintering temperature is controlled at 1050 ℃ and the sintering time is 1 hour. The clinker is cooled, crushed and ground into particles of 325-5000 meshes, heated water (95 ℃) is stirred and dissolved, the precipitated solid is separated by a liquid-solid device such as a filter press, a liquid phase (mainly sodium aluminate) is collected, in order to ensure recovery rate, the red mud is washed and stirred by hot water for multiple times, washing liquid of the washed and stirred red mud and the liquid phase filtered before are carbonized in the process of continuously heating (the temperature is kept at 75 ℃), aluminum hydroxide precipitate is generated by carbonization, the aluminum hydroxide precipitate is separated by the filter press or other solid-liquid separators, solid aluminum hydroxide is collected, the solid aluminum hydroxide is washed by hot water, alkali is removed, and the recovery rate of industrial alkali is 340 kg. And finally, drying and bagging. The recovery rate of aluminum was 90%.
Example 2
The present example provides a process for preparing aluminum hydroxide:
the aluminum-containing raw material is fly ash, the content of aluminum oxide is 45%, and the content of silicon dioxide is 50%.
The fly ash and the quicklime are respectively crushed and ground into particles with the particle size of 325 meshes to 5000 meshes, 1 ton of the fly ash, 1.1 ton of the quicklime and 300 kg of industrial alkali are mixed, evenly stirred, 260 kg of water is added to prepare bricks or pellets, the bricks or pellets are dried at 200 ℃ to ensure that the water content of the bricks or pellets is lower than 5 percent, and then are sintered, wherein the sintering temperature is controlled at 800 ℃ and the sintering time is 2.5 hours. The clinker is cooled, crushed and ground into particles of 325-5000 meshes, heated water (55 ℃) is stirred and dissolved, the precipitated solid is separated by a liquid-solid device such as a filter press, a liquid phase (mainly sodium aluminate) is collected, in order to ensure recovery rate, the red mud is washed and stirred by hot water for multiple times, washing liquid of the washed and stirred red mud and the liquid phase filtered before are carbonized in the process of continuously heating (the temperature is kept at 55 ℃), aluminum hydroxide precipitate is generated by carbonization, the aluminum hydroxide precipitate is separated by the filter press or other solid-liquid separators, solid aluminum hydroxide is collected, the solid aluminum hydroxide is washed by hot water, alkali is removed, and the recovery rate of industrial alkali is 255 kg. And finally, drying and bagging. The recovery rate of aluminum was 75%.
Example 3
The present example provides a process for preparing aluminum hydroxide:
the aluminum-containing raw material is coal gangue, the content of aluminum oxide is 35%, and the content of silicon dioxide is 60%.
Crushing and grinding the gangue and the quicklime into particles with the particle size of 325 meshes to 5000 meshes, mixing according to 1 ton of the gangue and 1.3 ton of the quicklime and 200 kg of industrial alkali, uniformly stirring, adding 250 kg of water to prepare bricks or pellets, drying the bricks or pellets at 220 ℃ to ensure that the water content of the bricks or pellets is lower than 5%, sintering at 1000 ℃ for 4 hours. The clinker is cooled, crushed and ground into particles of 325-5000 meshes, heated water (90 ℃) is stirred and dissolved, the precipitated particles are separated by a liquid-solid device such as a filter press, a liquid phase (mainly sodium aluminate) is collected, in order to ensure recovery rate, the red mud is washed and stirred by hot water for multiple times, washing liquid of the washed and stirred red mud and the liquid phase filtered before are carbonized in the process of continuously heating (the temperature is kept at 85 ℃), aluminum hydroxide precipitate is generated by carbonization, the aluminum hydroxide precipitate is separated by the filter press or other solid-liquid separators, solid aluminum hydroxide is collected, the solid aluminum hydroxide is washed by hot water, alkali is removed, and the recovery rate of industrial alkali is 150 kg. And finally, drying and bagging. The recovery rate of aluminum was 87%.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (9)
1. The process for preparing the aluminum hydroxide by breaking through the aluminum-silicon ratio of the raw materials is characterized by comprising the following steps of:
crushing and grinding an aluminum-containing raw material and quicklime, uniformly mixing the raw material with industrial alkali, adding water into the obtained mixture to prepare bricks or pellets, and sequentially drying and sintering;
cooling the sintered clinker, crushing and grinding again, heating water, stirring and dissolving out, separating solid from liquid, and collecting a liquid phase;
carbonizing the liquid phase under heating, separating solid from liquid, washing, drying and bagging;
wherein the content of aluminum oxide in the aluminum-containing raw material is more than or equal to 35 percent.
2. The process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials according to claim 1, wherein the mass of the quicklime and the aluminum-containing raw materials is 1-1.3: 1.
3. the process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials according to claim 1, wherein the amount of industrial alkali used per ton of aluminum-containing raw materials is 200 kg to 500 kg.
4. The process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio as recited in claim 1, wherein in the step of adding water to prepare bricks or pellets, the water is added in an amount of 10 to 15% by mass of the mixture in order to enable adhesion.
5. The process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials according to claim 1, wherein the temperature of the drying is 100-300 ℃;
the sintering temperature is 750-1200 ℃ and the sintering time is 1-5 hours.
6. The process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials according to claim 1, wherein the particle size of the crushed and ground material is 325-5000 mesh.
7. The process for preparing aluminum hydroxide by breaking through a raw material aluminum-silicon ratio according to claim 1, wherein the temperature of the hot water is 55 ℃ to 100 ℃.
8. The process for preparing aluminum hydroxide by breaking through a raw material aluminum-silicon ratio according to claim 1, wherein the carbonization temperature is 55 ℃ to 85 ℃.
9. The process for preparing aluminum hydroxide by breaking through the aluminum-silicon ratio of raw materials according to claim 1, wherein the washing is performed by hot water with a temperature of not less than 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311026360.4A CN116924443A (en) | 2023-08-15 | 2023-08-15 | Process for preparing aluminum hydroxide by breaking through aluminum-silicon ratio of raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311026360.4A CN116924443A (en) | 2023-08-15 | 2023-08-15 | Process for preparing aluminum hydroxide by breaking through aluminum-silicon ratio of raw materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116924443A true CN116924443A (en) | 2023-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311026360.4A Pending CN116924443A (en) | 2023-08-15 | 2023-08-15 | Process for preparing aluminum hydroxide by breaking through aluminum-silicon ratio of raw materials |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116924443A (en) |
-
2023
- 2023-08-15 CN CN202311026360.4A patent/CN116924443A/en active Pending
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