CN112194157B - Alumina crystallization auxiliary agent and preparation method thereof - Google Patents
Alumina crystallization auxiliary agent and preparation method thereof Download PDFInfo
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- CN112194157B CN112194157B CN202011178511.4A CN202011178511A CN112194157B CN 112194157 B CN112194157 B CN 112194157B CN 202011178511 A CN202011178511 A CN 202011178511A CN 112194157 B CN112194157 B CN 112194157B
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- 238000002425 crystallisation Methods 0.000 title claims abstract description 38
- 230000008025 crystallization Effects 0.000 title claims abstract description 38
- 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 32
- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 23
- -1 unsaturated fatty acid ester Chemical class 0.000 claims abstract description 20
- 239000010688 mineral lubricating oil Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 235000021122 unsaturated fatty acids Nutrition 0.000 claims abstract description 18
- 239000010426 asphalt Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 7
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 7
- 239000002199 base oil Substances 0.000 claims description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 7
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 7
- QYDYPVFESGNLHU-UHFFFAOYSA-N elaidic acid methyl ester Natural products CCCCCCCCC=CCCCCCCCC(=O)OC QYDYPVFESGNLHU-UHFFFAOYSA-N 0.000 claims description 6
- QYDYPVFESGNLHU-KHPPLWFESA-N methyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC QYDYPVFESGNLHU-KHPPLWFESA-N 0.000 claims description 6
- 229940073769 methyl oleate Drugs 0.000 claims description 6
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 claims description 6
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 6
- 229920000053 polysorbate 80 Polymers 0.000 claims description 6
- 229940068968 polysorbate 80 Drugs 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000001149 (9Z,12Z)-octadeca-9,12-dienoate Substances 0.000 claims description 4
- WTTJVINHCBCLGX-UHFFFAOYSA-N (9trans,12cis)-methyl linoleate Natural products CCCCCC=CCC=CCCCCCCCC(=O)OC WTTJVINHCBCLGX-UHFFFAOYSA-N 0.000 claims description 4
- LNJCGNRKWOHFFV-UHFFFAOYSA-N 3-(2-hydroxyethylsulfanyl)propanenitrile Chemical compound OCCSCCC#N LNJCGNRKWOHFFV-UHFFFAOYSA-N 0.000 claims description 4
- PKIXXJPMNDDDOS-UHFFFAOYSA-N Methyl linoleate Natural products CCCCC=CCCC=CCCCCCCCC(=O)OC PKIXXJPMNDDDOS-UHFFFAOYSA-N 0.000 claims description 4
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 4
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 4
- 229940057950 sodium laureth sulfate Drugs 0.000 claims description 4
- SXHLENDCVBIJFO-UHFFFAOYSA-M sodium;2-[2-(2-dodecoxyethoxy)ethoxy]ethyl sulfate Chemical compound [Na+].CCCCCCCCCCCCOCCOCCOCCOS([O-])(=O)=O SXHLENDCVBIJFO-UHFFFAOYSA-M 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 17
- 239000013078 crystal Substances 0.000 abstract description 16
- 229910001388 sodium aluminate Inorganic materials 0.000 abstract description 13
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 abstract description 12
- 239000002245 particle Substances 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 6
- 230000002452 interceptive effect Effects 0.000 abstract description 3
- 235000013311 vegetables Nutrition 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 239000003518 caustics Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 2
- 229930182558 Sterol Natural products 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010900 secondary nucleation Methods 0.000 description 2
- 150000003432 sterols Chemical class 0.000 description 2
- 235000003702 sterols Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical group CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 229930003427 Vitamin E Natural products 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229940046009 vitamin E Drugs 0.000 description 1
- 235000019165 vitamin E Nutrition 0.000 description 1
- 239000011709 vitamin E Substances 0.000 description 1
- 238000009736 wetting Methods 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
- 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 discloses an alumina crystallization auxiliary agent and a preparation method thereof. The composition comprises the following components in parts by mass: 38-50 parts of mineral lubricating oil, 2-10 parts of plant asphalt, 20-40 parts of mixed surfactant and 10-20 parts of unsaturated fatty acid ester, wherein the mixed surfactant is a mixture of anionic surfactant and nonionic surfactant. Under the heating condition, firstly mixing mineral lubricating oil and unsaturated fatty acid ester, then adding mixed surfactant, and finally adding vegetable asphalt, mixing and stirring. The alumina crystallization auxiliary agent can strengthen the seed crystal decomposition process, improve the decomposition efficiency of the sodium aluminate solution seed crystal, promote the interactive growth between particles, and has the advantages of low cost, simple preparation process and industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of alumina production, and particularly relates to an alumina crystallization auxiliary agent and a preparation method thereof.
Background
With the rapid development of electrolytic aluminum technology, stricter requirements are put on the quality of alumina. The sandy alumina has good fluidity, high strength, high activity, environmental protection, energy saving and other excellent properties, and gradually replaces powdery alumina to become an ideal raw material for electrolytic aluminum plants at home and abroad. The production of the sandy alumina has higher requirements on the production process, and particularly, the seed precipitation decomposition process of the sodium aluminate solution is a common problem in the alumina industry for improving the seed precipitation efficiency.
The decomposition process of the sodium aluminate solution seed precipitation is accompanied with complex physical and chemical changes, and in order to improve seed precipitation efficiency, the crystallization auxiliary agent is the simplest and most effective method. Most of domestic manufacturers use imported crystallization aids, which restricts the development of alumina production enterprises in China, so that the research and development of a crystallization aid with independent intellectual property rights and suitable for the characteristics of the crystallization aid is urgently needed.
Disclosure of Invention
The invention aims to provide an alumina crystallization auxiliary agent and a preparation method thereof. The alumina crystallization auxiliary agent can strengthen the seed crystal decomposition process, improve the decomposition efficiency of sodium aluminate solution seed crystal, promote the interactive growth among particles and inhibit secondary nucleation, and has low cost and simple preparation process.
In order to solve the problems, the invention is realized by the following technical scheme:
the aluminum oxide crystallization auxiliary agent is provided and comprises the following components in parts by weight: 38-50 parts of mineral lubricating oil, 2-10 parts of plant asphalt, 20-40 parts of mixed surfactant and 10-20 parts of unsaturated fatty acid ester, wherein the mixed surfactant is a mixture of anionic surfactant and nonionic surfactant.
According to the scheme, the alumina crystallization auxiliary agent comprises the following components in parts by weight: 45-50 parts of mineral lubricating oil, 2-5 parts of plant asphalt, 25-35 parts of mixed surfactant and 15-20 parts of unsaturated fatty acid ester.
According to the scheme, the mineral lubricating oil is at least one of lubricating oil base oil 100SN, lubricating oil base oil 150N and lubricating oil base oil 200 SN.
According to the scheme, in the mixed surfactant, the anionic surfactant is at least one of sodium stearate and sodium laureth sulfate, and the nonionic surfactant is at least one of nonyl phenol and polysorbate 80.
According to the scheme, in the mixed surfactant, the mass ratio of the anionic surfactant to the nonionic surfactant is (4-7): 1.
according to the scheme, the unsaturated fatty acid ester is at least one of methyl oleate and methyl linoleate.
The preparation method of the alumina crystallization auxiliary agent comprises the following steps:
1) mixing mineral lubricating oil and unsaturated fatty acid ester, and stirring at 40-50 deg.C for 15-30 min;
2) then adding the mixed surfactant, mixing and stirring for 5-10 minutes;
3) and finally adding the plant asphalt, mixing and stirring for 30-60 minutes, stopping heating and cooling to normal temperature to obtain the aluminum oxide crystallization aid.
The mixed surfactant is adsorbed to the surface of the seed crystal in the sodium aluminate solution, so that the surface tension and the interfacial tension of the solution are changed, a double electric layer is compressed, the interfacial composition and the structure of a system are changed, and aluminate ions are favorably close to the surface of an aluminum hydroxide crystal, so that the concentration of the aluminate ions on certain active points on the surface of the seed crystal is increased, crystals are separated out, and the decomposition efficiency of the sodium aluminate solution is improved. The plant asphalt comprises 10% of sterol, 5% of vitamin E and a large amount of higher fatty acid, wherein the higher fatty acid comprises oleic acid, linoleic acid, sodium stearate and the like, the surface tension of the solution can be reduced, decomposition of sodium chlorate solution seed decomposition is promoted, the sterol can be used as a W/O emulsifier and has good permeability, surfactant molecules can be promoted to be dispersed in the solution, and the plant asphalt can be used as a binder among particles to more closely link the particles with low strength and loose connection.
The mineral lubricating oil and the unsaturated fatty acid ester have good lubricating property and solubilization property, and the mineral lubricating oil is adsorbed on the surface of the seed crystal to make the surface of the seed crystal hydrophobic, so that the wetting angle of the surface of the particle is increased, and the agglomeration capability among the particles is favorably enhanced.
The invention has the beneficial effects that:
the aluminum oxide crystallization auxiliary agent provided by the invention can effectively improve agglomeration of aluminum hydroxide particles, strengthen a seed crystal decomposition process, improve decomposition efficiency of sodium aluminate solution seed crystal, promote interactive growth among particles and inhibit secondary nucleation through the synergistic cooperation of mineral lubricating oil, plant asphalt, mixed surfactant and unsaturated fatty acid ester, and has the advantages of low cost, simple preparation process and good industrial application prospect.
Detailed Description
The invention is further illustrated by the following specific examples, which are not intended to limit the scope of the invention.
Example 1
The aluminum oxide crystallization auxiliary agent is provided and comprises the following components in parts by weight:
50 parts of mineral lubricating oil, 5 parts of plant asphalt, 27 parts of mixed surfactant and 18 parts of unsaturated fatty acid ester.
Wherein the mineral lubricating oil is base oil 150SN, the mixed surfactant is a mixture of sodium stearate and nonyl phenol (mass ratio is 5:1), and the unsaturated fatty acid ester is methyl oleate.
The preparation method of the alumina crystallization auxiliary agent comprises the following steps:
1) adding the base oil 150SN and the methyl oleate into a reaction kettle, starting stirring, heating to 45 ℃, and stirring for 15 minutes after reaching a preset temperature.
2) Sodium stearate and nonylphenol were then added to the reaction kettle and stirred for 5 minutes.
3) And finally adding the plant asphalt, mixing and stirring for 60 minutes, and stopping heating. And cooling to normal temperature to obtain the alumina crystallization auxiliary agent which is dark brown liquid.
Example 2
The aluminum oxide crystallization auxiliary agent is provided and comprises the following components in percentage by mass:
50 parts of mineral lubricating oil, 3 parts of plant asphalt, 30 parts of mixed surfactant and 17 parts of unsaturated fatty acid ester.
Wherein the mineral lubricating oil is base oil 150SN, the mixed surfactant is a mixture of sodium stearate and polysorbate 80 (mass ratio is 6:1), and the unsaturated fatty acid ester is methyl oleate.
The preparation method of the alumina crystallization auxiliary agent comprises the following steps:
1) firstly adding 150N of base oil and methyl oleate into a reaction kettle, starting stirring, heating to 50 ℃, and stirring for 30 minutes after reaching a preset temperature.
2) Sodium stearate and polysorbate 80 were then added to the reaction kettle and stirred for 10 minutes.
3) And finally adding the plant asphalt, mixing and stirring for 60 minutes, and stopping heating. And cooling to normal temperature to obtain the alumina crystallization auxiliary agent which is dark brown liquid.
Example 3
The aluminum oxide crystallization auxiliary agent is provided and comprises the following components in percentage by mass:
40 parts of mineral lubricating oil, 10 parts of plant asphalt, 30 parts of mixed surfactant and 20 parts of unsaturated fatty acid ester.
Wherein the mineral lubricating oil is base oil 150SN, the mixed surfactant is a mixture of sodium laureth sulfate and polysorbate 80 (mass ratio of 7:1), and the unsaturated fatty acid ester is methyl linoleate.
The preparation method of the alumina crystallization auxiliary agent comprises the following steps:
1) adding base oil 100SN and methyl linoleate into a reaction kettle, starting stirring, heating to 45 ℃, and stirring for 20 minutes after reaching a preset temperature;
2) adding sodium laureth sulfate and polysorbate 80 into the reaction kettle, and stirring for 10 minutes;
3) and finally adding the plant asphalt, mixing and stirring for 45 minutes, and stopping heating. And cooling to normal temperature to obtain the alumina crystallization auxiliary agent which is dark brown liquid.
Comparative example 1
Commercial product: and (3) a SNF crystallization aid.
Comparative example 2
Commercial products: and (4) a Nalco crystallization aid.
Comparative example 3
This comparative example is a blank without any addition of auxiliaries.
The products prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to a performance test as follows: the method simulates the on-site process conditions of certain alumina factories in Guangxi and carries out seed decomposition experiments. Taking the sodium aluminate fine solution and the aluminum hydroxide seed crystal in the production field, wherein the temperature of a first tank is 62 ℃, the temperature of a last tank is 50 ℃, the decomposition time is 48 hours, the stirring speed is 100r/min, the solid content is 850g/L, and the addition amount of the crystallization auxiliary agent is 30 ppm. When seed precipitation decomposition is started, sodium aluminate fine solution is firstly added, the temperature is raised to 62 ℃, then 30ppm of crystallization auxiliary agent is added, stirring is carried out for 30min, and then aluminum hydroxide seed crystal is added. The reaction temperature reduction rate was 1 ℃ per 4 hours. After the reaction is finished, sampling for post-treatment, and then carrying out titration analysis on the reaction liquid by adopting chemical industry standard HGT 4518-2013 of the people's republic of China, detecting the content and causticity ratio of caustic alkali and alumina in the solution, and then obtaining the decomposition rate. The granularity of the aluminum hydroxide crystal seeds is detected by a laser granularity analyzer, the granularity distribution of the crystal seeds is more than 45 mu m as reference, and the surface condition of the aluminum hydroxide particles is observed by an SEM scanning electron microscope.
Decomposition Rate (%)
αk1Caustic to alumina oxide ratio of (caustic ratio) -sodium aluminate liquor
αk0(causticity ratio) -content ratio of caustic alkali to alumina after reaction of sodium aluminate mother liquor
The analysis results of the sodium aluminate solution and the analysis results of the particle size of the aluminum hydroxide are shown in table 1:
TABLE 1 comparison of crystallization aid Properties of examples 1-3 and comparative examples 1-3
| Causticity ratio (alpha)k0/αk1) | Decomposition Rate (%) | ＞45μm(％) | |
| Example 1 | 2.93/1.62 | 44.71 | 59.32 |
| Example 2 | 3.00/1.62 | 46.00 | 60.74 |
| Example 3 | 2.98/1.62 | 45.64 | 59.96 |
| Comparative example 1 | 2.85/1.62 | 43.15 | 58.69 |
| Comparative example 2 | 2.87/1.62 | 43.55 | 59.47 |
| Comparative example 3 | 2.77/1.62 | 41.52 | 55.74 |
The test results show that the crystallization aid obtained in the examples 1 to 3 has good strengthening effect in the sodium aluminate solution, and has good industrial prospect.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (6)
1. The alumina crystallization auxiliary agent is characterized by comprising the following components in parts by mass: 38-50 parts of mineral lubricating oil, 2-10 parts of plant asphalt, 20-40 parts of a mixed surfactant and 10-20 parts of unsaturated fatty acid ester, wherein the mixed surfactant is a mixture of an anionic surfactant and a nonionic surfactant, the anionic surfactant is at least one of sodium stearate and sodium laureth sulfate, and the nonionic surfactant is at least one of nonylphenol and polysorbate 80.
2. The alumina crystallization aid according to claim 1, which is composed of the following components in parts by mass: 45-50 parts of mineral lubricating oil, 2-5 parts of plant asphalt, 25-35 parts of mixed surfactant and 15-20 parts of unsaturated fatty acid ester.
3. The alumina crystallization aid according to claim 1, wherein the mineral lubricating oil is at least one of lubricating base oils 100SN, 150N, 200 SN.
4. The alumina crystallization aid according to claim 1, wherein the mixed surfactant comprises the anionic surfactant and the nonionic surfactant in a mass ratio of (4-7): 1.
5. the alumina crystallization aid according to claim 1, wherein the unsaturated fatty acid ester is at least one of methyl oleate and methyl linoleate.
6. A method for preparing the alumina crystallization aid according to any one of claims 1 to 5, comprising the steps of:
1) firstly, mixing mineral lubricating oil and unsaturated fatty acid ester, and stirring for 15-30 minutes at the temperature of 40-50 ℃;
2) then adding the mixed surfactant, mixing and stirring for 5-10 minutes;
3) and finally adding the plant asphalt, mixing and stirring for 30-60 minutes, stopping heating and cooling to normal temperature to obtain the aluminum oxide crystallization aid.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101092242B (en) * | 2007-05-22 | 2010-11-10 | 中国铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
| CN106241844A (en) * | 2016-07-15 | 2016-12-21 | 牛太同 | A kind of sandy alumina seeded precipitation additive |
| CN109574053B (en) * | 2019-01-23 | 2021-04-27 | 邢国艾 | Special crystallization auxiliary agent for alumina plant and preparation method thereof |
| CN109621497B (en) * | 2019-01-23 | 2020-12-18 | 邢国艾 | Special defoaming agent for alumina plant and preparation method thereof |
| CN111017969A (en) * | 2019-12-20 | 2020-04-17 | 湖南诺兰蒂尔环保科技有限公司 | Crystallization auxiliary agent for decomposing sodium aluminate seed crystal and preparation method of aluminum hydroxide |
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