CN1031689A - Producing sandy alumina through continuous stirring and decomposition of seed technology - Google Patents
Producing sandy alumina through continuous stirring and decomposition of seed technology Download PDFInfo
- Publication number
- CN1031689A CN1031689A CN87101379A CN87101379A CN1031689A CN 1031689 A CN1031689 A CN 1031689A CN 87101379 A CN87101379 A CN 87101379A CN 87101379 A CN87101379 A CN 87101379A CN 1031689 A CN1031689 A CN 1031689A
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- seed
- decomposing
- sodium aluminate
- decomposition
- precipitation tank
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention belongs to the processing method of producing sandy alumina.The purpose of invention provides a kind of technology that is suitable for industrial with sintering process sodium aluminate refined liquid producing sandy alumina through continuous stirring and decomposition of seed.This technology become general between the sterilization point-score into the continuous seed component method, improved plant factor, simplified operation, reduce cost.
Description
The invention belongs to the processing method of producing sandy alumina.
No. 85102276 patent applications of China disclose the method that a kind of sintering process refined liquid is produced sandy alumina, and this method adopts the sandy aluminium hydroxide of special preparation to make crystal seed, stir decomposition method by the seed that is interrupted and produce sandy aluminium hydroxide.When preparing the sandy aluminium hydroxide crystal seed with the carbonating decomposition method, slurry temperature is controlled at 73-77 ℃ for good, because carbon branch process is an exothermic process, need establish cooling formality or equipment in addition if realize the temperature control of slurries.In addition, adopt the seed that is interrupted to stir decomposition method, plant factor is low, trivial operations, and product cost improves.
The objective of the invention is, provide and adopt producing sandy alumina through continuous stirring and decomposition of seed technology in a kind of alkali-lime sinter process aluminum oxide production process, need not control slurry temperature in its seed crystal production process.
Flow process of the present invention is divided three operations: stir decomposition, the filtration of decomposing rear slurry and washing, Aluminium hydroxide roasting with sandy aluminium hydroxide as the seed that crystal seed carries out refined sodium aluminate solution.
Major technique feature of the present invention is that seed stirs decomposition course to carry out in series connection seed precipitation tank series continuously.
Accompanying drawing is a process flow sheet of the present invention.Details are as follows with technical process of the present invention in conjunction with the accompanying drawings:
Sintering process sodium aluminate refined liquid (1), its alumina content 90-110 gram/liter, α
k1.45-1.55, temperature 70-80 ℃.(1) with in carbon sub-sand shape aluminium hydroxide crystal seed (2) is sent into first groove of the seed decomposing tank series (3) of connecting continuously, seed ratio can be 0.8-1.2.For improving the physical strength of product sandy alumina, need to strengthen the stirring in first seed precipitation tank and second seed precipitation tank, can adopt pressurized air, promptly directly feed pressure 3.0-5.0 kilograms per centimeter from bottom land
2Pressurized air (10), make that solid particulate is fluidized state in the groove.Slurries in first groove continuously flow into second seed precipitation tank from the chute at groove top, and each seed precipitation tank after flowing into successively in the same way.Since three-flute, the stirring of slurries can be mechanical stirring, also can use pressurized air to feed slurries through the center extraction pipe, carries out layer liquid formula and stirs.Series connection seed precipitation tank series can be made up of 7-10 groove.Decomposition is 40-45 hour with the residence time of refined sodium aluminate solution in series connection seed precipitation tank series.Rate of decomposition is 48-52%.Finishing slurries that seed stir to decompose is flowed into by the chute of the last seed precipitation tank and mixes groove (4), pump into pressure filter (6) by pump (5) and carry out liquid-solid separation, filter cake is delivered to roasting kiln (7), make sandy alumina (9) after 1000-1100 ℃ of roasting, filtrate (8) is sent material process back to and is used for batching.
The sandy aluminium hydroxide crystal seed is with stirring the preparation of carbonating decomposition method.Preparation condition can be: decomposing with solution is the industrial sodium aluminate refined liquid, and its alumina content is a 85-110 gram/liter, α
k1.45-1.55, make crystal seed with carbon sub-sand shape aluminum oxide, seed ratio is 0.15-0.30, decomposing initial temperature is 64-68 ℃, lets alone to be warming up to decomposing terminal later on, the CO of feeding
2Gas concentration is 35-40%, and carbon divided time length 3.0-3.5 hour, and the aluminum oxide rate of decomposition is by the decomposition curve control of quality product grade.After the carbon branch was finished, slurries carried out liquid-solid separation, promptly got the sandy aluminium hydroxide as crystal seed.
The mitogenetic product sandy alumina of sterilization method improvement was the continuous seed component method between technology of the present invention was incited somebody to action, and had improved plant factor, had simplified operation, and product cost reduces, and is suitable for industrial application.
Example:
Decompose and use industrial refined sodium aluminate solution, its composition is: alumina content 90-100 gram/liter, α
k1.45, Al
2O
3/ SiO
2450, seed ratio 1.0 decomposes 75 ℃ of initial temperatures, and 65 ℃ of final temperatures decompose 40 hours time length, aluminum oxide rate of decomposition 50%.
Claims (9)
1, the method for seed stirring decomposition for producing sand-like alumina in alkali-lime sinter process aluminum oxide production process, seed stirring by refined sodium aluminate solution is decomposed, filtration and washing, Aluminium hydroxide roasting three operations of decomposing rear slurry constitute, and it is characterized in that the refined sodium aluminate solution seed stirs decomposition course and carries out continuously in series connection seed precipitation tank series.
2, in accordance with the method for claim 1, the alumina content that it is characterized in that said refined sodium aluminate solution is a 90-110 gram/liter, α
k1.45-1.55, temperature 70-80 ℃.
3, according to claim 1 or 2 described methods, it is characterized in that it is carbon sub-sand shape aluminium hydroxide that said seed stirs the crystal seed that decomposes, seed ratio is 0.8-1.2.
4,, it is characterized in that the interior first and second liang of grooves of said series connection seed precipitation tank series directly feed pressurized air and stir pressure of compressed air 3.0-5.0 kilograms per centimeter according to claim 1 or 2 described methods
2
5, in accordance with the method for claim 3, it is characterized in that the interior first and second liang of grooves of said series connection seed precipitation tank series directly feed pressurized air and stir pressure of compressed air 3.0-5.0 kilograms per centimeter
2
6, in accordance with the method for claim 3, it is characterized in that the preparation condition of said carbon sub-sand shape aluminium hydroxide crystal seed is: decomposing with solution is the industrial sodium aluminate refined liquid, and its alumina content is a 85-110 gram/liter, α
k1.45-1.55, make crystal seed with carbon sub-sand shape aluminium hydroxide, seed ratio 0.15-0.30, decomposing initial temperature is 64-68 ℃, lets alone to be warming up to decomposing terminal later on, the CO of feeding
2Gas concentration is 35-40%, and carbon divided time length 3.0-3.5 hour, and the aluminum oxide rate of decomposition is by the decomposition curve control of quality product grade.
7, according to claim 1 or 2 or 5 or 6 described methods, it is characterized in that decomposing with the residence time of refined sodium aluminate solution in series connection seed precipitation tank series be 40-45 hour.
8, in accordance with the method for claim 3, it is characterized in that decomposing with the residence time of refined sodium aluminate solution in series connection seed precipitation tank series be 40-45 hour.
9, in accordance with the method for claim 4, it is characterized in that decomposing with the residence time of refined sodium aluminate solution in series connection seed precipitation tank series be 40-45 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87101379A CN1031689A (en) | 1987-09-02 | 1987-09-02 | Producing sandy alumina through continuous stirring and decomposition of seed technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87101379A CN1031689A (en) | 1987-09-02 | 1987-09-02 | Producing sandy alumina through continuous stirring and decomposition of seed technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1031689A true CN1031689A (en) | 1989-03-15 |
Family
ID=4813371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87101379A Pending CN1031689A (en) | 1987-09-02 | 1987-09-02 | Producing sandy alumina through continuous stirring and decomposition of seed technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031689A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075043C (en) * | 1995-05-26 | 2001-11-21 | 昭和电工株式会社 | Aluminium hydroxide and preparation method thereof |
| CN105776269A (en) * | 2016-03-24 | 2016-07-20 | 中国铝业股份有限公司 | Micro-powder aluminum hydroxide preparation method and device and micro-powder aluminum hydroxide |
-
1987
- 1987-09-02 CN CN87101379A patent/CN1031689A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075043C (en) * | 1995-05-26 | 2001-11-21 | 昭和电工株式会社 | Aluminium hydroxide and preparation method thereof |
| CN105776269A (en) * | 2016-03-24 | 2016-07-20 | 中国铝业股份有限公司 | Micro-powder aluminum hydroxide preparation method and device and micro-powder aluminum hydroxide |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |