CN103204529B - Production method of packing-level high whiteness aluminum hydroxide - Google Patents
Production method of packing-level high whiteness aluminum hydroxide Download PDFInfo
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- CN103204529B CN103204529B CN201310162126.4A CN201310162126A CN103204529B CN 103204529 B CN103204529 B CN 103204529B CN 201310162126 A CN201310162126 A CN 201310162126A CN 103204529 B CN103204529 B CN 103204529B
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Abstract
The invention discloses a production method of a packing-level high whiteness aluminum hydroxide, and belongs to the technical field of the production of aluminum hydroxide. The preparation method is characterized by comprising the steps of drying Bayer process aluminum hydroxide, adding a decoloring agent which is a mixture of one or two or more of sodium percarbonate, sodium percarbonate and sodium persulfate, adding either ethanol or polyethylene glycol as a dispersant, wherein the total addition of the decoloring agent and the dispersant is 0.1-1% of the weight of the Bayer process aluminum hydroxide; and grinding the mixed materials in a ball mill to a required granularity, to obtain the high whiteness aluminum hydroxide. The aluminum hydroxide which is high in whiteness and different in granularity is prepared from raw material Bayer process aluminum hydroxide with the combination of the conventional sintering ball-milling process, to achieve series production of the Bayer process aluminum hydroxide.
Description
Technical field
A production method for filler level high-white aluminum hydroxide, belongs to the production technical field of aluminium hydroxide.
Background technology
Filler level high-white aluminum hydroxide is topmost one in inorganic fire-retarded filler, because it presses down cigarette, low burn into is inexpensive, with regard to consumption, in all fire retardants, is sure to occupy the first place.Its outward appearance is white crystalline powder, and chemical formula is Al (OH)
3or Al
2o
33H
2o, mineralogy buzzword is hydrated alumina (also claiming gibbsite).Aluminium hydroxide is stable 200 DEG C of left and right, once higher than this temperature, will be decomposed into anhydrous alumina and water, produces and can absorb in a large number heat simultaneously.The filler level high-white aluminum hydroxide of existing market supply, is divided into coarse grain (median size >40um), particulate (median size 3 ~ 40um), particulate or claims the product of superfine granule (median size 1um left and right) according to its grain graininess size.
Bayer process production of aluminum hydroxide technique is being processed low silicon bauxite, particularly in the time processing gibbsitic bauxite, there is flow process simple, operation is convenient, quality product high, economic benefit is far from other method and can matches in excellence or beauty, and therefore in whole world commodity aluminium hydroxide, has more than 90% and produces with bayer process.Bayer process is roughly: bauxite, lime and alkali lye are made raw pulp according to a certain percentage; Hydrated alumina under high pressure (high temperature) condition in stripping ore, makes sodium aluminate solution, is decomposed and is made aluminium hydroxide by kind.Its principal reaction equation technique is as follows:
Al
2O
3 + 2 NaOH + 3 H
2O =2 NaAl(OH)
4
The temperature and pressure of reactor determines according to the composition of bauxite.For containing the more bauxite of gibbsite, can be under normal pressure, 150 DEG C are reacted, and many for diaspore and boehmite content, need to react in pressurization, and typical conditions is 200 ~ 250 DEG C, 30 ~ 40 normal atmosphere.
In order to remove water glass, Bayer process is by slow heated solution, impels silicon-dioxide, aluminum oxide and sodium hydroxide to generate the hydrated aluminum silicate of sodalite structure, precipitates, and then crosses and filters out, and so, just only has sodium aluminate to stay in supernatant liquor:
SiO
2 + 2 NaOH =Na
2SiO
3+H
2O
The solution of heat enters in refrigerating unit, and thin up is simultaneously cooling gradually, and sodium aluminate can be hydrolyzed, and generates aluminium hydroxide, now adds pure alumina powder, can separate out white aluminium hydroxide solid:
NaAl(OH)
4 = Al(OH)
3 + NaOH
Also can pass into excess carbon dioxide and help to produce aluminium hydroxide:
NaAl(OH)
4 + CO
2= Al(OH)
3 + NaHCO
3
Filter out after the aluminium hydroxide of generation, remaining concentration still higher sodium hydroxide solution can recycle, for the treatment of another batch of bauxite, and stripping aluminium hydroxide.
Due to the humate that contains more ore in sodium aluminate solution and bring into, make sodium aluminate solution with garnet, planting in point process of decomposing, humate can be adsorbed on surface of aluminum hydroxide, causes the whiteness of aluminium hydroxide to reduce.Therefore, the aluminium hydroxide of producing by Bayer process makes its whiteness lower owing to having adsorbed the coloured humate in solution in decomposition course, cannot serve as applying filler in the industries such as cable, insulator, thermoplastic materials, electric power, electrical equipment, rubber, plastics, its Application Areas is limited by very large.
Producing at present filler level high-white aluminum hydroxide is mainly to adopt the ways such as lime, hydrotalcite or solution combustion, by sodium aluminate solution being processed in the process of Bayer process production aluminium hydroxide, remove humate wherein, solution is purified, the solution recycling after purifying is produced aluminium hydroxide, and aluminium hydroxide reaches filler level high-white aluminum hydroxide granularity through broken or grinding.But this complex process, bed drain purge are large, cost of manufacture is very high.The one that Chinese patent CN 102502742 A are aforesaid method, select one or more in calcium oxide, magnesium oxide, calcined dolomite, hydrogen peroxide to join in sodium aluminate solution as scavenging agent, wherein add-on is 5 ~ 20g/L, and the treatment time is 0.5 ~ 3h, and coloring matter is deviate from.Although can make high-whiteness aluminium hydroxide micropowder, the scavenging agent losing efficacy after reaction need to remove excessive and reaction after product, has increased process complexity, and excessive scavenging agent and scavenging agent reaction after product will be discharged as waste residue, have increased bed drain purge.In Bayer process aluminium hydroxide explained hereafter, in sodium aluminate solution, remove humate, although reaching the object of high-white aluminum hydroxide processed can realize, but due to the feature of Bayer process aluminium hydroxide technique self, the product granularity that this kind of method makes is more single, can not adapt to the requirement of different environments for use.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provide a kind of and can effectively decompose the humate in Bayer process aluminium hydroxide, only go the production method of a kind of filler level high-white aluminum hydroxide of different grain size product.
The technical solution adopted for the present invention to solve the technical problems is: the production method of this filler level high-white aluminum hydroxide, it is characterized in that, and adopt following processing step:
1) prepare aluminium hydroxide by Bayer process;
2) aluminium hydroxide making is dried at 80 ~ 150 DEG C, to moisture lower than after 0.5%, in aluminium hydroxide by weight 1:(0 ~ 3) add discoloring agent and dispersion agent, and mix; Total add-on of discoloring agent and dispersion agent is 1 ‰ of aluminium hydroxide weight ~ 10 ‰;
3) mixed material is placed in to grinding in ball grinder to desired particle size;
Wherein, described discoloring agent is a kind of, two kinds and the two or more mixture in SPC-D, Sodium peroxoborate or Sodium Persulfate; Described dispersion agent is ethanol or polyoxyethylene glycol.
Preferably, total add-on of described discoloring agent and dispersion agent is 3 ‰ ~ 6 ‰ of Bayer process aluminium hydroxide weight.
Preferably, described discoloring agent is SPC-D and the Sodium peroxoborate mixture of 1.2:1 in mass ratio.SPC-D, can be by residual humate oxygenolysis as the discoloring agent of Bayer process aluminium hydroxide, the one-Step bleach of going forward side by side.SPC-D is from easily decomposing in decolorization, and resolvent easily removes the use that does not affect aluminium hydroxide.Sodium peroxoborate is that a kind of efficient oxygen is SYNTHETIC OPTICAL WHITNER, and Sodium peroxoborate is different from the SPC-D that is all superoxide, and it is not adding and thing of being formed by hydrogen peroxide, but contains the ring-type peroxyboric acid root negatively charged ion (B being made up of two peroxidation chains
2o
8h
4 2-), not containing BO
3 -ion.Inventor finds SPC-D and Sodium peroxoborate, and oxygen activity and the bleaching action that stability produces in Bayer process aluminium hydroxide process of lapping of the mixture of 1.2:1 is especially remarkable in mass ratio, can still less under milling time, obtain better effect at discoloring agent still less, particularly be applicable to by using and make filler level high-white aluminum hydroxide as discoloring agent in Bayer process aluminium hydroxide process of lapping.
Described ball mill is the ball mill of aluminum oxide liner plate, and grinding medium is alumina balls; Ratio of grinding media to material is 8 ~ 10.The grating of milling time alumina balls is according to required filler level high-white aluminum hydroxide product grading by traditional technology adjustment, and milling time generally should not exceed 16 hours.
Drying plant when Bayer process aluminium hydroxide is dried does not have special requirement, can be the known drying plants of industry such as loft drier, rake baker, blade baker, strengthening boiling baker.
The present invention prepares the raw material choose Bayer process aluminium hydroxide of filler level high-white aluminum hydroxide, and Bayer process aluminium hydroxide is the aluminium hydroxide that traditional Bayer process makes.The present invention utilizes the raw material of Bayer process aluminium hydroxide in conjunction with the ball-milling technology of conventional sintering legal system aluminium hydroxide, in mechanical milling process, add one or both and two or more mixture in SPC-D, Sodium peroxoborate, Sodium Persulfate as discoloring agent, reach the object of Gao Bai with the humate of eliminating in Bayer process aluminium hydroxide, and produce varigrained product in conjunction with ball-milling technology.Can utilize traditional aluminium hydroxide ball-milling technology, make varigrained aluminium hydroxide by the control that adds kind or consumption to Ball-milling Time and dispersion agent.
Tradition is prepared the method for high-white aluminum hydroxide, and research direction is all to decolour in the solution in early stage.The present invention looks for another way and decolours in the process of aluminium hydroxide granulation, and finds good decolorizing effect in this process, the discoloring agent that product quality is high, and provide optimum quantum of utilization and proportioning.The usage quantity proportioning of discoloring agent and dispersion agent, too little decolouring, the high white quality of impact of can not completing of discoloring agent ratio; The words that discoloring agent ratio is too large reduce the function influence of dispersion agent to the control of product granularity.
Compared with prior art, the beneficial effect that the production method of a kind of filler level high-white aluminum hydroxide of the present invention has is: the present invention is taking Bayer process aluminium hydroxide as raw material, in conjunction with conventional sintering method ball-milling technology, in ball milling granulation, utilize discoloring agent and the humate oxidation bleaching selected, significantly improve the whiteness of Bayer process aluminium hydroxide, make high whiteness and have varigrained aluminium hydroxide, realize the producing in serial form of Bayer process aluminium hydroxide, the Application Areas that can greatly expand Bayer process aluminium hydroxide, adapts to different Production requirements.Traditional Bayer process is produced to three steps of filler level high-white aluminum hydroxide technique, merge into a step and complete.Compared with the technique of producing filler level high-white aluminum hydroxide with Bayer process, the present invention has advantages of simple process, easily operation, facility investment and increases cost less.
Embodiment
Below by specific embodiment, the production method of a kind of filler level of the present invention high-white aluminum hydroxide is described further, wherein embodiment 1 is most preferred embodiment.In embodiment, the density of dehydrated alcohol is pressed 0.78g/mL, and the density of polyoxyethylene glycol is by 1.125 g/mL.In the time that implementing, other conditions can make corresponding adjustment according to the density under differing temps or the polymerization degree.
Embodiment 1
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 135 DEG C, dry 2 hours, rapidly this material being poured into has been that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 10g, SPC-D 12g, dehydrated alcohol 36mL, grind discharging after 2 hours, index result is now:
。
Embodiment 2
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 125 DEG C, dry 3 hours, rapidly this material being poured into has been that 9:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 10g, SPC-D 10g, polyoxyethylene glycol 36mL, grind discharging after 10 hours, index result is now:
。
Embodiment 3
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 115 DEG C, dry 3 hours, rapidly this material being poured into has been that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium Persulfate 5g, SPC-D 10g, polyoxyethylene glycol 22mL, grind discharging after 3 hours, index result is now:
。
Embodiment 4
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 150 DEG C, dry 2 hours, rapidly this material being poured into has been that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 12g, dehydrated alcohol 23mL, grind discharging after 2 hours, index result is now:
。
Embodiment 5
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 80 DEG C, dry 3 hours to moisture to 0.5, rapidly this material is poured into to add be that 9:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add SPC-D 20g, polyoxyethylene glycol 53mL, grind discharging after 10 hours, index result is now:
。
Embodiment 6
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 120 DEG C, dry 3 hours to moisture to 0.5, rapidly this material is poured into to add be that 10:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 10g, SPC-D 20g, Sodium Persulfate 5g, dehydrated alcohol 58mL, grind discharging after 10 hours, index result is now:
。
Embodiment 7
Get in the loft drier of 125 DEG C of Bayer process aluminium hydroxide 10Kg, dry 3 hours to moisture to 0.5, rapidly this material is poured into to add be that 10:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 5g, Sodium Persulfate 5g, dehydrated alcohol 13mL, grind discharging after 5 hours, index result is now:
。
Embodiment 8
Get in the loft drier of 125 DEG C of Bayer process aluminium hydroxide 10Kg, dry 3 hours to moisture to 0.5, rapidly this material is poured into to add be that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 7g, dehydrated alcohol 3.8mL, grind discharging after 10 hours, index result is now:
。
Embodiment 9
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 125 DEG C, dry 3 hours to moisture to 0.5, rapidly this material is poured into to add be that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 20g, grind discharging after 20 minutes, index result is now:
。
Comparative example 1
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 135 DEG C, dry 2 hours, rapidly this material being poured into has been that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, add Sodium peroxoborate 100g, SPC-D 100g, dehydrated alcohol 36mL, grind discharging after 2 hours, index result is now:
。
Comparative example 2
Get Bayer process aluminium hydroxide 10Kg in the loft drier of 135 DEG C, dry 2 hours, rapidly this material being poured into has been that 8:1 adds in the ball mill of 30L aluminum oxide liner plate of grinding medium by ratio of grinding media to material, adds SPC-D 5g, grind discharging after 2 hours, index result is now:
。
The embodiment of the present invention is decoloured by grinding, and larger variation has occurred product whiteness index, has substantially reached the requirement of filler level high-white aluminum hydroxide to whiteness index, and can realize the varigrained producing in serial form of Bayer process aluminium hydroxide.And product whiteness promotes not quite after adding excessive discoloring agent in comparative example 1, but it is higher to increase cost.Comparative example 2 in the time that discoloring agent addition is too small due to quantity not sufficient, so decolorizing effect is very bad.And conventional superoxide hydrogen peroxide is owing to being that liquid state is attached to part, more because the hydrogen peroxide of the too large decolouring dosage of activity cannot mix, partial reaction is complete, and still no bleaching of major part, affect quality product if increase usage quantity not only can increase cost and can moisturize, almost cannot in ball mill, grind.
The above, be only preferred embodiment of the present invention, is not the restriction of the present invention being made to other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (4)
1. a production method for filler level high-white aluminum hydroxide, is characterized in that, adopts following processing step:
1) prepare aluminium hydroxide by Bayer process;
2) aluminium hydroxide making is dried at 80 ~ 150 DEG C, to moisture lower than after 0.5%, in aluminium hydroxide by weight 1:(0 ~ 3) add discoloring agent and dispersion agent, and mix; Total add-on of discoloring agent and dispersion agent is 1 ‰ of aluminium hydroxide weight ~ 10 ‰;
3) mixed material is placed in to grinding in ball grinder to desired particle size;
Wherein, described discoloring agent is a kind of, two kinds and the two or more mixture in SPC-D, Sodium peroxoborate or Sodium Persulfate; Described dispersion agent is ethanol or polyoxyethylene glycol.
2. the production method of a kind of filler level high-white aluminum hydroxide according to claim 1, is characterized in that: total add-on of described discoloring agent and dispersion agent is 3 ‰ ~ 6 ‰ of Bayer process aluminium hydroxide weight.
3. the production method of a kind of filler level high-white aluminum hydroxide according to claim 1, is characterized in that: described discoloring agent is SPC-D and the Sodium peroxoborate mixture of 1.2:1 in mass ratio.
4. the production method of a kind of filler level high-white aluminum hydroxide according to claim 1, is characterized in that: described ball mill is the ball mill of aluminum oxide liner plate, and grinding medium is alumina balls; Ratio of grinding media to material is 8 ~ 10.
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|---|---|---|---|
| CN201310162126.4A CN103204529B (en) | 2013-05-06 | 2013-05-06 | Production method of packing-level high whiteness aluminum hydroxide |
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| CN103204529B true CN103204529B (en) | 2014-11-05 |
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|---|---|---|---|---|
| EP0714853A1 (en) * | 1994-11-21 | 1996-06-05 | Aluminum Company Of America | Method for improving the brightness of aluminium hydroxide |
| JP5246510B2 (en) * | 2008-07-10 | 2013-07-24 | 住友化学株式会社 | Method for producing decolorized sodium aluminate aqueous solution |
| CN102351228A (en) * | 2011-07-04 | 2012-02-15 | 中国铝业股份有限公司 | Production method of high-whiteness aluminum hydroxide |
| 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 |
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Address after: No. 388, Tianhao Road, Zibo Economic Development Zone, Zibo City, Shandong Province Patentee after: Zibo pengfeng New Material Technology Co., Ltd Address before: 255300 Mei River Industrial Park, Zhoucun District, Shandong, Zibo Patentee before: Zibo Pengfeng Aluminum Industry Co., Ltd. |
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Denomination of invention: A production method of filler grade high white aluminum hydroxide Effective date of registration: 20211129 Granted publication date: 20141105 Pledgee: Zibo xinyuejia Textile Knitting Co.,Ltd. Pledgor: Zibo pengfeng New Material Technology Co.,Ltd. Registration number: Y2021980013501 |
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Date of cancellation: 20220228 Granted publication date: 20141105 Pledgee: Zibo xinyuejia Textile Knitting Co.,Ltd. Pledgor: Zibo pengfeng New Material Technology Co.,Ltd. Registration number: Y2021980013501 |