CN111484055A - Decomposition crystallization auxiliary agent used in alumina production process - Google Patents
Decomposition crystallization auxiliary agent used in alumina production process Download PDFInfo
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- CN111484055A CN111484055A CN201910086950.3A CN201910086950A CN111484055A CN 111484055 A CN111484055 A CN 111484055A CN 201910086950 A CN201910086950 A CN 201910086950A CN 111484055 A CN111484055 A CN 111484055A
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- decomposition
- alumina
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- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 48
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000002425 crystallisation Methods 0.000 title claims abstract description 30
- 230000008025 crystallization Effects 0.000 title claims abstract description 30
- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 21
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- -1 hydroxyl organic compounds Chemical class 0.000 claims abstract description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 8
- 125000003277 amino group Chemical group 0.000 claims description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 2
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- 239000003513 alkali Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 4
- 239000004480 active ingredient Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 13
- 239000013078 crystal Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 239000000654 additive Substances 0.000 description 6
- 238000004131 Bayer process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 210000000582 semen Anatomy 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
-
- 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
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
- C01F7/145—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process characterised by the use of a crystal growth modifying agent other than aluminium hydroxide seed
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (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 technical field of chemical industry, and particularly discloses a decomposition crystallization auxiliary agent CGM (CGM) used in an alumina production process, which is a composition formed by combining one, two or three of hydroxyl organic compounds, amine organic compounds and carboxyl organic compounds, wherein the mass content of active ingredients of the hydroxyl organic compounds except water is 2-60%, and the addition amount of the decomposition crystallization auxiliary agent in a sodium aluminate solution (refined solution) is 3-100 ppm (namely 3-100 ml/m)3-semen); the sodium aluminate solution has the advantages of water solubility, alkali solubility, good dispersibility, small dosage, capability of improving the decomposition rate of the sodium aluminate solution when being used for decomposing the sodium aluminate solution, obvious coarsening of the granularity of a decomposition product and high strength of calcined alumina.
Description
Technical Field
The invention relates to a decomposition crystallization auxiliary agent used in an alumina production process, and belongs to the technical field of new materials.
Background
The alumina factory in China uses diaspore as raw material, a Bayer process is adopted to produce sandy alumina by using a high-concentration sodium aluminate solution, the crystal seed decomposition of the sodium aluminate solution is one of the main processes for producing alumina by the Bayer process and is also a key process for realizing the sandy alumina, factors influencing the decomposition process are many, the influence of the factors is multifaceted and complicated, and the conditions controlling the decomposition process have great influence on the yield and the product quality due to different conditions. Foreign aluminum factories have a lot of experience in transforming powdery aluminum oxide into sandy aluminum oxide, and people should use the experience for reference, but the practical situation of China must be combined. The upgrading, production increasing and efficiency increasing have become the main research direction in the production of alumina at present.
No matter the national enterprise or the civil enterprise basically adopts a decomposition mode of the Guangxi branch company of the medium aluminum, namely a one-stage alumina production technology with high solid content, high concentration and medium temperature, part of imported ore alumina enterprises only have slightly low concentration, the decomposition rate is 46-53%, the semen yield is 75-95 kg/m3, the product quality, especially the granularity index is greatly different, and some alumina enterprises are far away from the sandy alumina index. The preparation of products with coarse granularity, high strength and good fluidity often contradicts with the decomposition conditions for improving the decomposition rate, and the preparation method is related to the technical control level and does not find a key control technology. In the last century, China is basically powdered and intermediate alumina, which is determined by the representative value of metallurgical-grade alumina of the International standards Association, the international level standard of metallurgical-grade alumina, the requirement of the Ministry of science and technology of the state on alumina indexes, and the indexes of powdered alumina and intermediate and powdered alumina.
At present, a lot of manufacturers add imported or domestic crystallization aids in the decomposition process, so that a good effect is achieved. The method is characterized in that a certain company in Guangxi province of the aluminum industry in China firstly uses foreign crystallization additives and combines with the adjustment of matched process parameters to produce the sandy alumina with stable relative quality, and a certain company in Henan adopts the crystallization additives of one domestic manufacturer 10 years ago, so that the granularity and the strength of the product are greatly improved, and the decomposition rate is only reduced to some extent. The crystallization aids are mainly used for matching with temperature parameters, changing nucleation frequency, improving the relative balance and stability of system particle size, inhibiting the precipitation of oxalate and improving the strength of roasted alumina, but have small influence on the decomposition yield. These crystallization aids are essentially oily organic substances, and have poor water solubility and poor dispersibility. In the past years, an assistant for improving the decomposition rate is developed in colleges and universities, the improvement amount is only about 0.5 percent through semi-industrial tests, the assistant is easily covered by production fluctuation, the effect is not obvious, and the assistant is not popularized and applied.
Research shows that the existing decomposition crystallization aids in the market are oily or emulsified substances, the water solubility or alkali solubility of the existing decomposition crystallization aids is not good, the dispersibility of the existing decomposition crystallization aids is not good, and certain defects particularly in the aspects of improving the particle size and increasing the decomposition rate exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a decomposition crystallization auxiliary agent used in the alumina production process by adopting a water-soluble mixture instead of the existing oily or emulsified substances in the markets at home and abroad for the first time, and can effectively solve the problems of long and coarse granularity and high decomposition rate in the decomposition process of a sodium aluminate solution.
In order to solve the above problems, the present invention provides the following technical solutions:
a decomposition crystallization auxiliary agent used in the production process of alumina is characterized in that: the crystallization auxiliary agent is a composition formed by combining one or three of hydroxyl, amine and carboxyl organic compounds, wherein the mass content of the organic compounds except water in the effective components is 2% -60%.
The decomposition crystallization auxiliary agent used in the production process of the alumina is characterized in that: the crystallization aid can be dissolved with water in any proportion. .
The decomposition crystallization auxiliary agent used in the production process of the alumina is characterized in that: hydroxyl group(s): amine groups: carboxyl groups: 1:1: 1-2: 3: 4. .
A decomposition crystallization aid for use in an alumina production process according to any one of the above, characterized in that: the addition amount of the decomposition crystallization auxiliary agent in the sodium aluminate solution (refined solution) is 3-100 ppm (namely 3-100 ml/m)3-semen).
The seed decomposition process of sodium aluminate solution is an important process of Bayer process. It is characterized by that in the sodium aluminate solution an AI (OH) is added3Crystal seed, cooling and stirring to make Al in the solution2O3With Al (OH)3The crystal is precipitated on the surface of the seed crystal. The seed precipitation process is the most time-consuming process (generally 45-72 hours) in Bayer process production, and generally does not exceed 55%. Due to many factors influencing decomposition, such as temperature, molecular ratio, seed granularity, caustic alkali concentration and the like, the seed precipitation process becomes a bottleneck for the development of the industrial production technology of the alumina. Therefore, finding a simple-to-operate, economically feasible way to strengthen the seed separation process becomes a difficult problem for alumina workers. The surfactant has many important functions in the bayer process, such as improving the crystal structure of aluminum hydroxide crystals, increasing the decomposition rate, coarsening crystal grains, and the like, due to the properties of interfacial adsorption, alignment, micelle formation, and the like, and thus, surface tension reduction. The solution to this problem has been developed in a breakthrough by the use of additives, especially surfactants.
The action mechanism of the crystallization auxiliary agent on the seed precipitation process is mainly embodied in the following aspects:
(1) promoting Al (OH)3Agglomeration of fine particles;
(2) eliminating the influence of organic matters;
(3) the decomposition rate is improved;
(4) reduce the sodium content of the product and improve the strength of the alumina product.
Detailed Description
| The following description is provided to illustrate the embodiments of the present invention, and it should be understood that the embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention. |
Example 1
CGM formulation (JT 1) example 1: 5 percent of hydroxyl group and 30 percent of amino group.
The decomposition comparison test is carried out by adopting factory materials, the decomposition parameters and the test results are shown in tables 1 and 2, wherein JT1 and JT2 are used as the patent decomposition crystallization auxiliary agent.
TABLE 1 test conditions
| T | t | SC（g/L） | CGM-ATA(ppm) | seed | solution | |
| Semen | 61~48℃ | 45h | 700 | 0 | Industrial process | Industrial process |
| T1 | 61~48℃ | 45h | 700 | Q1：20 | Industrial process | Industrial process |
| JT1 | 61~48℃ | 45h | 700 | Q2：20 | Industrial process | Industrial process |
| JT2 | 61~48℃ | 45h | 700 | Q3：20 | Industrial process | Industrial process |
| Foreign 1 | 61~48℃ | 45h | 700 | Q4：20 | Industrial process | Industrial process |
| Foreign 2 | 61~48℃ | 45h | 700 | Q5：20 | Industrial process | Industrial process |
| Domestic 1 | 61~48℃ | 45h | 700 | Q6：20 | Industrial process | Industrial process |
| Domestic 2 | 61~48℃ | 45h | 700 | Q7：20 | Industrial process | Industrial process |
The additive has good water-soluble alkali solubility, the additives at home and abroad are insoluble in water, one contrast sample at home and abroad has poor alkali solubility, the other one is emulsified by alkali dissolution, and two types at home have good alkali solubility, but are not superior to the products used by the additive.
TABLE 2 product results
| η | △η | -10μ | -20μ | -45μ | D10 | D50 | D90 | SiO2 | Fe2O3 | Na2O | |
| TS | Seed crystal | 0.10 | 1.06 | 5.95 | 50.860 | 88.648 | 147.522 | 0.26 | |||
| TMS | Staged seed crystal | 0.13 | 1.33 | 9.20 | 46.140 | 87.531 | 151.335 | 0.27 | |||
| T1 | 54.43 | 0 | 0 | 0.79 | 6.75 | 50.189 | 93.889 | 161.495 | 0.33 | ||
| JT1 | 55.00 | 2.41 | 0 | 0.77 | 6.65 | 50.367 | 94.000 | 161.363 | 0.32 | ||
| JT2 | 55.46 | 3.46 | 0 | 0.66 | 6.69 | 50.292 | 94.153 | 161.903 | 0.32 | ||
| Foreign 1 | 53.70 | 0.15 | 0.08 | 0.78 | 7.89 | 48.106 | 90.412 | 156.552 | 0.29 | ||
| Foreign 2 | 53.40 | -0.15 | 0.10 | 0.75 | 6.50 | 50.372 | 92.847 | 159.156 | 0.29 | ||
| Domestic 1 | 54.14 | 0.59 | 0.08 | 0.85 | 7.61 | 48.601 | 91.456 | 157.168 | 0.30 | ||
| Domestic 2 | 54.29 | 0.74 | 0.19 | 1.01 | 9.26 | 46.046 | 88.419 | 154.994 | 0.30 |
In the aspect of decomposition rate, the auxiliary agent of the invention is superior to the auxiliary agents at home and abroad, and the decomposition rate is respectively improved by 2.41 percent and 3.46 percent. In the aspect of product granularity, JT1 and JT2 are superior to blank and home and abroad auxiliaries, D50 is the largest, and fine particles are the smallest. The seed standing time of the test is too long, and the activity is influenced. In consideration of the yield, the auxiliary agent has better effect.
Example 2
CGM formulation (JT 2) example 2: 25% of hydroxyl group, 10% of amino group and 30% of S% of carboxyl group.
The auxiliary agent is tried in a certain factory, the addition amount is 5-20 ppm, the flat disk AH enters a roasting furnace and is roasted into alumina, collision and dehydration are carried out to generate crushing, the average particle size of minus 45 μm in 11 months is increased by 7.84%, the average particle size of 1-14 days in 12 months is increased by 10.99%, the average particle size of 15-22 days in 12 months is increased by 5.20%, the crushing of the particles in 11 months is not too high due to the fact that the particle size is thick, and the crushed fragments are still larger than minus 45 μm, which shows that after CGM is added, AH mixed with No. 1 line and No. 2 line is roasted into alumina AO, the strength of the AO is increased, the AO is related to a precursor AH which generates an agglomerated structure in a large amount, and if the. Indicating that the CGM has great contribution rate to increasing the material strength.
TABLE 1 increase of-45 μm after calcination of alumina in a calciner to flat disk AH
| Flat plate AH-45 μm% | Roasted AO-45 μm% | △-45μm% | Remarks for note | |
| 12 months and 1-14 days | 16.92 | 27.91 | 10.99 | Without using JT2 according to the invention, another auxiliary agent is used |
| 12 months and 15-22 days | 18.77 | 23.97 | 5.20 | Mixing another assistant with JT2, and calcining AH after several days |
| 12 month and 28 days | 18.77% | 20.17% | 1.40% | Independent roasting of JT2 used plant productsConversion calculation |
Example 3
CGM formulation example 3: hydroxyl group content 70%, amino group content 3%, and carboxylic acid 10%.
The CGM of the invention is tried in a decomposition system of an alumina factory, the CGM is 10:00 at 31 days in 12 months, the addition amount is 20ppm, and from the initial result, the granularity and the decomposition rate are obviously improved, thereby providing a basis for the next slurry addition, which is shown in the following table.
TABLE 2 decomposition rates before and after addition of CGM of the present invention and changes in system particle size
| AH-45μm% | Median diameter D50 | The decomposition rate is η% | Remarks for note | |
| 12 month and 28 days | 17.62 | 68.74 | 50.88 | |
| 12 month and 29 days | 17.64 | 67.99 | 50.26 | |
| 12 month and 30 days | 17.63 | 68.15 | 49.12 | |
| Mean value of | 17.63 | 68.29 | 50.09 | |
| 12 month and 31 days | 15.75 | 72,21 | 50.26 | |
| 1 month and 1 day | 16.84 | 69.45 | 51.91 | |
| 1 month and 2 days | 16.57 | 69.94 | 51.81 | |
| Mean value of | 16.39 | 70.53 | 51.33 | |
| △ before and after addition | －1.24 | 2.24 | 1.24 |
Example 4
CGM formulation example 4: 15% of hydroxyl, 30% of amino and 15% of carboxylic acid.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A decomposition crystallization auxiliary agent used in the production process of alumina is characterized in that: the crystallization auxiliary agent is a composition formed by combining one, two or three of hydroxyl, amine and carboxyl organic compounds, wherein the mass content of the organic compounds except water in the effective components is 2-60%.
2. A decomposition crystallization aid for use in an alumina production process according to claim 1, wherein: the crystallization aid can be dissolved with water in any proportion.
3. A decomposition crystallization aid for use in an alumina production process according to claim 1, characterized by a hydroxyl group: amine groups: carboxyl group =1:1:1 to 2: 3: 4.
4. A decomposition crystallization aid for use in an alumina production process according to any one of claims 1 to 3, characterized in that: the addition amount of the decomposition crystallization auxiliary agent in the sodium aluminate solution (refined solution) is 3-100 ppm (namely 3-100 ml/m)3-semen).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113845784A (en) * | 2021-09-22 | 2021-12-28 | 山东银箭金属颜料有限公司 | Preparation method of ultraviolet-proof polymer-coated nano aluminum oxide pigment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036931A (en) * | 1976-06-25 | 1977-07-19 | Kaiser Aluminum & Chemical Corporation | Bayer process production of alumina |
| AU6660486A (en) * | 1985-12-17 | 1987-06-18 | Aluminium Pechiney | Process for the production at a high level of productivity of aluminium trihydroxide in a high state of purity and with a median diameter of less than 4 micrometres, which is regulated as required |
| CN1911808A (en) * | 2006-09-14 | 2007-02-14 | 中国铝业股份有限公司 | Method for decomposing ultrahigh concentration sodium aluminate solution |
| CN101654270A (en) * | 2009-09-10 | 2010-02-24 | 沈阳工业大学 | Method for eliminating periodic thinning of granularity of seed product |
| CN104817100A (en) * | 2015-04-15 | 2015-08-05 | 中南大学 | Method for preparing sand-shaped aluminum oxide |
| CN105668598A (en) * | 2016-01-19 | 2016-06-15 | 中国铝业股份有限公司 | Method for removing sodium oxalate during aluminum oxide production process |
| CN108002415A (en) * | 2017-12-06 | 2018-05-08 | 中国铝业股份有限公司 | The processing method of the crystal of sodium oxalate is removed in aluminum oxide production process |
-
2019
- 2019-01-29 CN CN201910086950.3A patent/CN111484055A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036931A (en) * | 1976-06-25 | 1977-07-19 | Kaiser Aluminum & Chemical Corporation | Bayer process production of alumina |
| AU6660486A (en) * | 1985-12-17 | 1987-06-18 | Aluminium Pechiney | Process for the production at a high level of productivity of aluminium trihydroxide in a high state of purity and with a median diameter of less than 4 micrometres, which is regulated as required |
| CN1911808A (en) * | 2006-09-14 | 2007-02-14 | 中国铝业股份有限公司 | Method for decomposing ultrahigh concentration sodium aluminate solution |
| CN101654270A (en) * | 2009-09-10 | 2010-02-24 | 沈阳工业大学 | Method for eliminating periodic thinning of granularity of seed product |
| CN104817100A (en) * | 2015-04-15 | 2015-08-05 | 中南大学 | Method for preparing sand-shaped aluminum oxide |
| CN105668598A (en) * | 2016-01-19 | 2016-06-15 | 中国铝业股份有限公司 | Method for removing sodium oxalate during aluminum oxide production process |
| CN108002415A (en) * | 2017-12-06 | 2018-05-08 | 中国铝业股份有限公司 | The processing method of the crystal of sodium oxalate is removed in aluminum oxide production process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113845784A (en) * | 2021-09-22 | 2021-12-28 | 山东银箭金属颜料有限公司 | Preparation method of ultraviolet-proof polymer-coated nano aluminum oxide pigment |
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