CN105152196A - Preparation method of superfine high-white aluminum hydroxide - Google Patents
Preparation method of superfine high-white aluminum hydroxide Download PDFInfo
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- CN105152196A CN105152196A CN201510540358.8A CN201510540358A CN105152196A CN 105152196 A CN105152196 A CN 105152196A CN 201510540358 A CN201510540358 A CN 201510540358A CN 105152196 A CN105152196 A CN 105152196A
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Abstract
The invention discloses a preparation method of superfine high-white aluminum hydroxide. The method includes adding active crystal seeds prepared from industrial-grade aluminium hydroxide into sodium aluminate solution, preparing superfine high-white aluminum hydroxide by means of seed decomposition, and separating, washing and drying the superfine high-white aluminum hydroxide subjected to seed decomposition to obtain the superfine high-white aluminum hydroxide. The number of crystal seeds can be reduced effectively, problems caused in the circulation process of the crystal seeds are solved thoroughly, stability of product quality is ensured, and the superfine high-white aluminum hydroxide has competitive advantage comparing with similar products and is simple in technical process, high in operability, less in equipment investment, low in cost, environment friendly and pollution free; meanwhile, materials in the technical process is recyclable, and clean production is realized accordingly.
Description
Technical field
The invention belongs to aluminium hydroxide preparing technical field, particularly relate to a kind of method utilizing active seed to prepare ultra-fine high-white aluminum hydroxide.
Background technology
At present, more and more higher to the performance requriements of fire retardant both at home and abroad, comply with fire retardant market, world high flame retardant, low smog, innoxious development trend, develop ultra-fine high-white aluminum hydroxide fire retardant new variety and there is wide market application foreground.The production technique of ultrafine aluminium hydroxide mainly contains two kinds, one is Physical: by machinery, the industrial aluminium hydroxide of Large stone is ground into small particle size, the advantage of this method is that technique is simple, invest little, but the particle diameter of more than 3 microns can only be obtained, and size-grade distribution is wide, crystalline structure is damaged, make product there is the problems such as granule-morphology is irregular, oil absorbency is high, affect its use properties, and equipment is complicated, production energy consumption is high.Another kind is chemical method, mainly refining Bayer process: with alkali lye dissolved hydrogen aluminum oxide, form oversaturated sodium aluminate solution, add aluminium hydroxide again as crystal seed, aluminate ion in solution is separated out with aluminium hydroxide form, foreign matter content can be obtained low, the high-quality aluminium hydroxide that particle diameter is little, but preparation technology requires high, and increase owing to planting a point once rear product cut size, the aluminium hydroxide decomposed out can not circulate as crystal seed, therefore, often criticize and all need to prepare crystal seed, and the internal circulating load of crystal seed is very large, increase cost, seriously constrain the follow-up developments of enterprise.Current, more and more higher to the requirement of ultrafine aluminium hydroxide both at home and abroad, adopt low-cost industrial production high-quality aluminium hydroxide but never to realize.
Summary of the invention
The object of the invention is the deficiency in order to solve the problems of the technologies described above existence, providing that a kind of technical process is simple, cost is low, utilize active seed, material reusable edible in technical process, the preparation method of the white hydrogen-oxygen aluminium of ultra-fine height of cleanly production can be realized.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is that the active seed by prepared by technical grade aluminium hydroxide joins in sodium aluminate solution, carry out a kind point decomposition and produce ultra-fine high-white aluminum hydroxide, then to plant point ultra-fine high-white aluminum hydroxide decomposed be separated, wash, dry, break up and can obtain ultra-fine high-white aluminum hydroxide.
The technical solution adopted in the present invention is:
The preparation of step one, supersaturated sodium aluminate solution: inject 90m in the dissolving tank of φ 4.5 × 7.5m
3mother liquid evaporation, the aluminium hydroxide that Bayer process is produced is added in the dissolving tank filling mother liquid evaporation, injecting steam in dissolving tank, make mother liquid evaporation temperature-stable at 100 ~ 105 DEG C, after carrying out stirring, dissolving 4-5h completely after steam heating, just can obtain the supersaturated sodium aluminate solution of high density, then sample, survey the seston of supersaturated sodium aluminate solution;
The thick liquid preparation of step 2, sodium aluminate solution: when the seston in supersaturated sodium aluminate solution is less than 10g/L, supersaturated sodium aluminate solution is injected High Temperature High Pressure dissolving tank, pass into steam, temperature be 120 ~ 130 DEG C, under pressure is the condition of 0.1 ~ 0.25Mpa, after heat-insulation pressure keeping 4 ~ 5h, sampling, surveys seston, when seston is less than 0.1g/L, namely reach thick liquid standard;
Step 3, decoloration process: the thick liquid of sodium aluminate solution through pump delivery in dashpot, according to the amount of sodium aluminate solution, activated magnesia is added by 2.0 ~ 5.0g/L, mechanical stirring is decoloured, temperature 70 ~ 90 DEG C, after churning time 1 ~ 2h, after leaf filter is separated, filtrate is the sodium aluminate solution that seston is less than 0.02g/L, i.e. seminal fluid;
The preparation of step 4, active seed: technical grade aluminium hydroxide is joined in shredder, the dispersion agent of 0.1%-0.5% is added by weight in aluminium hydroxide, crystal seed grinds the mode taking two-stage shredder to connect, crystal seed is after one-level grinder to certain particle size, enter secondary grinder machine, the granularity being milled to active seed is 1.2-2.0 μm;
Step 5, plant a point decomposition technique: the seminal fluid that step 3 is obtained is through one-level plate-type heat exchanger, i.e. decomposition nut liquid and seminal fluid heat exchange, secondary plate-type heat exchanger, namely temperature is that in the circulation of 31 DEG C, water and seminal fluid carry out heat exchange, thus seminal fluid is cooled to 50 ~ 65 DEG C, seminal fluid after cooling is bored in bottom decomposing tank to the mechanical stirring containing active seed through pump delivery, carries out continuous constant temperature kind and decompose 72h, the weight adding active seed is the 15%-30% of the seminal fluid gross weight after cooling;
Step 6, solid-liquor separation technique: by the slurries after the decomposition of step 5 kind, carry out solid-liquor separation through pumping toward plate-and-frame filter press, the liquid separated is mother liquor, the solid separated is aluminum hydroxide filter cake;
Step 7, mother liquor isolated in step 6, after high temperature evaporation is concentrated, the Na obtained
2the mother liquid evaporation that O is dense, sends back to the aluminium hydroxide produced with Bayer process in step one and carries out solubilizing reaction, prepare supersaturated sodium aluminate solution;
Step 8, aluminum hydroxide filter cake isolated in step 6 after changing slurry, be sent to vertical type blotter press to be separated, seven washings, finally the aluminum hydroxide filter cake of moisture 20% is directly entered blade dryer through reamer, carry out drying, be 0.5 ~ 0.6Mpa by gauge pressure, temperature is the water vapour indirect heat exchange of 155 ~ 160 DEG C, water content of aluminium hydroxide is made to reach 0.3%, work in-process storehouse is directly entered after deironing, aluminium hydroxide in work in-process storehouse is through breaing up, deironing, after screening, screen underflow with gas delivery in finished bin, namely this ultra-fine high-white aluminum hydroxide is obtained.
Wherein in step one, the relation of the area of a room of the oxygen aluminum hydride that mother liquid evaporation and Bayer process are produced can with reference to formula m=(1.03NK-AO) × 1.53 × V ÷ (1-W);
Wherein m: the weight of the oxygen aluminum hydride that added Bayer process is produced, unit K g;
NK: the sodium oxide concentration of mother liquid evaporation, unit K g/m
3;
AO: the alumina concentration of mother liquid evaporation, unit K g/m
3;
V: the volume of mother liquid evaporation, unit m
3;
W: the water moisture content of added Bayer process aluminium hydroxide, unit %.
Wherein step 3 adds activated magnesia complicated organism and some coloring matters can be made in sodium aluminate solution to be removed, be separated by filtration insolubles, obtain the sodium aluminate solution decoloured, when the sodium aluminate solution colourity after decolouring can reach 470nm, absorbancy is less than 0.08;
Wherein shredder described in step 4 is the Ball-stirring mill of alumina liner, and grinding medium is alumina balls, and ratio of grinding media to material is 8-10, and the grating of milling time, alumina balls adjusts according to required seed granularity, milling time 4-6 hour;
The one-level grinding wherein carried out in step 4 and secondary grinder are the granularity requirements in order to reach active seed; The granularity of active seed is 1.2-2.0 μm, and its granularity has reached super-fine powder level, due to its Particle pollution, and the large percentage of surface atom and body phase atomicity, thus there is high activity, can Sum decomposition be induced well to go out ultrafine aluminium hydroxide.
Wherein in step 4, dispersion agent is polyacrylamide, sodium polyacrylate or polyoxyethylene glycol; Adding dispersion agent is in order to the reunion preventing fine particle is closed in grinding aid.
Wherein in step 8, after vertical Filter Press washing, aluminum hydroxide filter cake is moisture: 20%, dried material temperature: 110 DEG C, the water ratio of dry outlet material: 0.3%.
Wherein seven washing water used of vertical type blotter press described in step 8 are alkali free qualified water, six wash waters are seven last round of wash waters, and five wash waters are six last round of wash waters, and the rest may be inferred, thus not only reach water saving, and reach environmental protection, free of contamination effect; Changing stock tank wash water temperature is 50 DEG C, and two to be washed till seven wash water temperature be 80 DEG C.
The invention has the beneficial effects as follows: can not only effectively reduce crystal seed quantity, thoroughly solve the puzzlement brought in crystal seed circular flow, and the obvious improving product quality of the stabilization energy of crystal seed quality, ensure that the stability of quality product and improve the competitive edge with like product, and present invention process flow process is simple, workable, facility investment is few, cost is low, environmental protection and pollution-free, meanwhile, The invention also achieves the material reusable edible in technical process, thus achieve cleanly production.
Embodiment
The following stated embodiment describes the present invention in detail:
Embodiment 1:
The preparation of step one, supersaturated sodium aluminate solution: inject 90m in the dissolving tank of φ 4.5 × 7.5m
3mother liquid evaporation, the aluminium hydroxide that Bayer process is produced is added in the dissolving tank filling mother liquid evaporation, injecting steam in dissolving tank, make mother liquid evaporation temperature-stable at 100 DEG C, after carrying out stirring, dissolving 4h completely after steam heating, just can obtain the supersaturated sodium aluminate solution of high density, then sample, survey the seston of supersaturated sodium aluminate solution;
The thick liquid preparation of step 2, sodium aluminate solution: when the seston in supersaturated sodium aluminate solution is less than 10g/L, supersaturated sodium aluminate solution is injected High Temperature High Pressure dissolving tank, pass into steam, temperature be 120 DEG C, under pressure is the condition of 0.1Mpa, after heat-insulation pressure keeping 4h, sampling, surveys seston, when seston is less than 0.1g/L, namely reach thick liquid standard;
Step 3, decoloration process: the thick liquid of sodium aluminate solution through pump delivery in dashpot, according to the amount of sodium aluminate solution, activated magnesia is added by 2.0g/L, mechanical stirring is decoloured, temperature 70 C, after churning time 1 ~ 2h, after leaf filter is separated, filtrate is the sodium aluminate solution that seston is less than 0.02g/L, i.e. seminal fluid;
The preparation of step 4, active seed: technical grade aluminium hydroxide is joined in shredder, the dispersion agent of 0.1% is added by weight in aluminium hydroxide, crystal seed grinds the mode taking two-stage shredder to connect, crystal seed is after one-level grinder to certain particle size, enter secondary grinder machine, the granularity being milled to active seed is 1.2-2.0 μm;
Step 5, plant a point decomposition technique: the seminal fluid that step 3 is obtained is through one-level plate-type heat exchanger, i.e. decomposition nut liquid and seminal fluid heat exchange, secondary plate-type heat exchanger, namely temperature is that in the circulation of 31 DEG C, water and seminal fluid carry out heat exchange, thus seminal fluid is cooled to 50 DEG C, seminal fluid after cooling is bored in bottom decomposing tank to the mechanical stirring containing active seed through pump delivery, carries out continuous constant temperature kind and decompose 72h, the weight adding active seed is 15% of the seminal fluid gross weight after cooling.
Step 6, solid-liquor separation technique: by the slurries after the decomposition of step 5 kind, carry out solid-liquor separation through pumping toward plate-and-frame filter press, the liquid separated is mother liquor, the solid separated is aluminum hydroxide filter cake;
Step 7, mother liquor isolated in step 6, after high temperature evaporation is concentrated, the Na obtained
2the mother liquid evaporation that O is dense, sends back to the aluminium hydroxide produced with Bayer process in step one and carries out solubilizing reaction, prepare supersaturated sodium aluminate solution;
Step 8, aluminum hydroxide filter cake isolated in step 6 through change slurry after, be sent to vertical type blotter press to carry out being separated, washing for seven times, finally the aluminum hydroxide filter cake of moisture 20% is directly entered blade dryer through reamer, carry out drying, be 0.5Mpa by gauge pressure, temperature is the water vapour indirect heat exchange of 155 DEG C, water content of aluminium hydroxide is made to reach 0.3%, work in-process storehouse is directly entered after deironing, aluminium hydroxide in work in-process storehouse through breaing up, deironing, after screening, screen underflow in finished bin, namely obtains this ultra-fine high-white aluminum hydroxide with gas delivery.
Embodiment 2:
The preparation of step one, supersaturated sodium aluminate solution: inject 90m in the dissolving tank of φ 4.5 × 7.5m
3mother liquid evaporation, the aluminium hydroxide that Bayer process is produced is added in the dissolving tank filling mother liquid evaporation, injecting steam in dissolving tank, make mother liquid evaporation temperature-stable at 105 DEG C, after carrying out stirring, dissolving 5h completely after steam heating, just can obtain the supersaturated sodium aluminate solution of high density, then sample, survey the seston of supersaturated sodium aluminate solution;
The thick liquid preparation of step 2, sodium aluminate solution: when the seston in supersaturated sodium aluminate solution is less than 10g/L, supersaturated sodium aluminate solution is injected High Temperature High Pressure dissolving tank, pass into steam, temperature be 130 DEG C, under pressure is the condition of 0.25Mpa, after heat-insulation pressure keeping 5h, sampling, surveys seston, when seston is less than 0.1g/L, namely reach thick liquid standard;
Step 3, decoloration process: the thick liquid of sodium aluminate solution through pump delivery in dashpot, according to the amount of sodium aluminate solution, activated magnesia is added by 5.0g/L, mechanical stirring is decoloured, temperature 90 DEG C, after churning time 1 ~ 2h, after leaf filter is separated, filtrate is the sodium aluminate solution that seston is less than 0.02g/L, i.e. seminal fluid;
The preparation of step 4, active seed: technical grade aluminium hydroxide is joined in shredder, the dispersion agent of 0.1%-0.5% is added by weight in aluminium hydroxide, crystal seed grinds the mode taking two-stage shredder to connect, crystal seed is after one-level grinder to certain particle size, enter secondary grinder machine, the granularity being milled to active seed is 1.2-2.0 μm;
Step 5, plant a point decomposition technique: the seminal fluid that step 3 is obtained is through one-level plate-type heat exchanger, i.e. decomposition nut liquid and seminal fluid heat exchange, secondary plate-type heat exchanger, namely temperature is that in the circulation of 31 DEG C, water and seminal fluid carry out heat exchange, thus seminal fluid is cooled to 65 DEG C, seminal fluid after cooling is bored in bottom decomposing tank to the mechanical stirring containing active seed through pump delivery, carries out continuous constant temperature kind and decompose 72h, the weight adding active seed is 30% of the seminal fluid gross weight after cooling.
Step 6, solid-liquor separation technique: by the slurries after the decomposition of step 5 kind, carry out solid-liquor separation through pumping toward plate-and-frame filter press, the liquid separated is mother liquor, the solid separated is aluminum hydroxide filter cake;
Step 7, mother liquor isolated in step 6, after high temperature evaporation is concentrated, the Na obtained
2the mother liquid evaporation that O is dense, sends back to the aluminium hydroxide produced with Bayer process in step one and carries out solubilizing reaction, prepare supersaturated sodium aluminate solution;
Step 8, aluminum hydroxide filter cake isolated in step 6 through change slurry after, be sent to vertical type blotter press to carry out being separated, washing for seven times, finally the aluminum hydroxide filter cake of moisture 20% is directly entered blade dryer through reamer, carry out drying, be 0.6Mpa by gauge pressure, temperature is the water vapour indirect heat exchange of 160 DEG C, water content of aluminium hydroxide is made to reach 0.3%, work in-process storehouse is directly entered after deironing, aluminium hydroxide in work in-process storehouse through breaing up, deironing, after screening, screen underflow in finished bin, namely obtains this ultra-fine high-white aluminum hydroxide with gas delivery.
Claims (5)
1. a preparation method for ultra-fine high-white aluminum hydroxide, is characterized in that: the preparation of step one, supersaturated sodium aluminate solution: in the dissolving tank of φ 4.5 × 7.5m, inject 90m
3mother liquid evaporation, the aluminium hydroxide that Bayer process is produced is added in the dissolving tank filling mother liquid evaporation, injecting steam in dissolving tank, make mother liquid evaporation temperature-stable at 100 ~ 105 DEG C, after carrying out stirring, dissolving 4-5h completely after steam heating, just can obtain the supersaturated sodium aluminate solution of high density, then sample, survey the seston of supersaturated sodium aluminate solution, the thick liquid preparation of step 2, sodium aluminate solution: when the seston in supersaturated sodium aluminate solution is less than 10g/L, supersaturated sodium aluminate solution is injected High Temperature High Pressure dissolving tank, pass into steam, temperature be 120 ~ 130 DEG C, under pressure is the condition of 0.1 ~ 0.25Mpa, after heat-insulation pressure keeping 4 ~ 5h, sampling, surveys seston, when seston is less than 0.1g/L, namely reach thick liquid standard, step 3, decoloration process: the thick liquid of sodium aluminate solution through pump delivery in dashpot, according to the amount of sodium aluminate solution, activated magnesia is added by 2.0 ~ 5.0g/L, mechanical stirring is decoloured, temperature 70 ~ 90 DEG C, after churning time 1 ~ 2h, after leaf filter is separated, filtrate is the sodium aluminate solution that seston is less than 0.02g/L, i.e. seminal fluid, the preparation of step 4, active seed: join in shredder by technical grade aluminium hydroxide, adds the dispersion agent of 0.1%-0.5% by weight in aluminium hydroxide, and crystal seed grinds the mode taking two-stage shredder to connect, step 5, plant a point decomposition technique: the seminal fluid that step 3 is obtained is through one-level plate-type heat exchanger, i.e. decomposition nut liquid and seminal fluid heat exchange, secondary plate-type heat exchanger, namely temperature is that in the circulation of 31 DEG C, water and seminal fluid carry out heat exchange, thus seminal fluid is cooled to 50 ~ 65 DEG C, seminal fluid after cooling is bored in bottom decomposing tank to the mechanical stirring containing active seed through pump delivery, carries out continuous constant temperature kind and decompose 72h, the weight adding active seed is the 15%-30% of the seminal fluid gross weight after cooling, step 6, solid-liquor separation technique: by the slurries after the decomposition of step 5 kind, carry out solid-liquor separation through pumping toward plate-and-frame filter press, the liquid separated is mother liquor, the solid separated is aluminum hydroxide filter cake, step 7, mother liquor isolated in step 6, after high temperature evaporation is concentrated, the Na obtained
2the mother liquid evaporation that O is dense, sends back to the aluminium hydroxide produced with Bayer process in step one and carries out solubilizing reaction, prepare supersaturated sodium aluminate solution, step 8, aluminum hydroxide filter cake isolated in step 6 after changing slurry, be sent to vertical type blotter press to be separated, seven washings, finally the aluminum hydroxide filter cake of moisture 20% is directly entered blade dryer through reamer, carry out drying, be 0.5 ~ 0.6Mpa by gauge pressure, temperature is the water vapour indirect heat exchange of 155 ~ 160 DEG C, water content of aluminium hydroxide is made to reach 0.3%, work in-process storehouse is directly entered after deironing, aluminium hydroxide in work in-process storehouse is through breaing up, deironing, after screening, screen underflow with gas delivery in finished bin, namely this ultra-fine high-white aluminum hydroxide is obtained.
2. the preparation method of a kind of ultra-fine high-white aluminum hydroxide according to claim 1, it is characterized in that: in step 4, crystal seed grinds the mode taking two-stage shredder to connect, crystal seed is after one-level grinder to certain particle size, enter secondary grinder machine, the granularity being milled to active seed is 1.2-2.0 μm.
3. the preparation method of a kind of ultra-fine high-white aluminum hydroxide according to claim 1, is characterized in that: in step 4, dispersion agent is polyacrylamide, sodium polyacrylate or polyoxyethylene glycol.
4. the preparation method of a kind of ultra-fine high-white aluminum hydroxide according to claim 1, it is characterized in that: in step 8, after vertical Filter Press washing, aluminum hydroxide filter cake is moisture: 20%, dried material temperature: 110 DEG C, the water ratio of dry outlet material: 0.3%.
5. the preparation method of a kind of ultra-fine high-white aluminum hydroxide according to claim 1, it is characterized in that: seven washing water used of vertical type blotter press described in step 8 are alkali free qualified water, six wash waters are seven last round of wash waters, five wash waters are six last round of wash waters, the rest may be inferred, changing stock tank wash water temperature is 50 DEG C, and two to be washed till seven wash water temperature be 80 DEG C.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467052A (en) * | 2018-05-16 | 2018-08-31 | 洛阳中超新材料股份有限公司 | Hydroxide flake aluminium and its preparation method and application |
| CN108751239A (en) * | 2018-06-25 | 2018-11-06 | 贵州博汇铝陶有限公司 | Cell grinds levigation method crystal seed and prepares ultrawhite ultrafine aluminium hydroxide method |
| CN109809453A (en) * | 2019-03-07 | 2019-05-28 | 洛阳中超新材料股份有限公司 | Ultrafine aluminium hydroxide and its preparation method and application |
| CN110357134A (en) * | 2019-08-16 | 2019-10-22 | 山东省化工研究院 | A kind of aluminium hydroxide synthesis process size controlling method |
| CN111362288A (en) * | 2020-05-14 | 2020-07-03 | 珠海粤博佳新材料有限公司 | Preparation process of high-whiteness aluminum hydroxide |
| CN112194160A (en) * | 2020-09-30 | 2021-01-08 | 洛阳中超新材料股份有限公司 | Method for decoloring sodium aluminate solution for superfine aluminum hydroxide |
| CN112225237A (en) * | 2020-10-26 | 2021-01-15 | 洛阳莱茵希德特种材料有限公司 | Preparation method of superfine aluminum hydroxide |
| CN115849420A (en) * | 2022-11-29 | 2023-03-28 | 洛阳中超新材料股份有限公司 | Primary crystal large-particle aluminum hydroxide, preparation method, silicon rubber and circuit board |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092242A (en) * | 2007-05-22 | 2007-12-26 | 山东铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
| CN102502732A (en) * | 2011-10-21 | 2012-06-20 | 河南煤业化工集团研究院有限责任公司 | Purification method of high-concentration sodium aluminate solution from Bayer process |
| CN104386725A (en) * | 2014-10-10 | 2015-03-04 | 洛阳中超非金属材料有限公司 | Method for preparing high-whiteness ultrafine aluminum hydroxide from aluminum hydroxide prepared by Bayer process |
-
2015
- 2015-08-20 CN CN201510540358.8A patent/CN105152196A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092242A (en) * | 2007-05-22 | 2007-12-26 | 山东铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
| CN102502732A (en) * | 2011-10-21 | 2012-06-20 | 河南煤业化工集团研究院有限责任公司 | Purification method of high-concentration sodium aluminate solution from Bayer process |
| CN104386725A (en) * | 2014-10-10 | 2015-03-04 | 洛阳中超非金属材料有限公司 | Method for preparing high-whiteness ultrafine aluminum hydroxide from aluminum hydroxide prepared by Bayer process |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467052A (en) * | 2018-05-16 | 2018-08-31 | 洛阳中超新材料股份有限公司 | Hydroxide flake aluminium and its preparation method and application |
| CN108467052B (en) * | 2018-05-16 | 2020-04-03 | 洛阳中超新材料股份有限公司 | Flake aluminum hydroxide and preparation method and application thereof |
| CN108751239A (en) * | 2018-06-25 | 2018-11-06 | 贵州博汇铝陶有限公司 | Cell grinds levigation method crystal seed and prepares ultrawhite ultrafine aluminium hydroxide method |
| CN109809453A (en) * | 2019-03-07 | 2019-05-28 | 洛阳中超新材料股份有限公司 | Ultrafine aluminium hydroxide and its preparation method and application |
| CN110357134A (en) * | 2019-08-16 | 2019-10-22 | 山东省化工研究院 | A kind of aluminium hydroxide synthesis process size controlling method |
| CN110357134B (en) * | 2019-08-16 | 2021-08-06 | 山东省化工研究院 | Particle size control method in aluminum hydroxide synthesis process |
| CN111362288A (en) * | 2020-05-14 | 2020-07-03 | 珠海粤博佳新材料有限公司 | Preparation process of high-whiteness aluminum hydroxide |
| CN112194160A (en) * | 2020-09-30 | 2021-01-08 | 洛阳中超新材料股份有限公司 | Method for decoloring sodium aluminate solution for superfine aluminum hydroxide |
| CN112194160B (en) * | 2020-09-30 | 2021-06-29 | 洛阳中超新材料股份有限公司 | Method for decoloring sodium aluminate solution for superfine aluminum hydroxide |
| CN112225237A (en) * | 2020-10-26 | 2021-01-15 | 洛阳莱茵希德特种材料有限公司 | Preparation method of superfine aluminum hydroxide |
| CN115849420A (en) * | 2022-11-29 | 2023-03-28 | 洛阳中超新材料股份有限公司 | Primary crystal large-particle aluminum hydroxide, preparation method, silicon rubber and circuit board |
| CN115849420B (en) * | 2022-11-29 | 2024-02-09 | 洛阳中超新材料股份有限公司 | Primary crystal large particle aluminium hydroxide, preparation method, silicon rubber and circuit board |
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