CN101844770A - Method for preparing white carbon black through extracting aluminum residue by fly ash - Google Patents
Method for preparing white carbon black through extracting aluminum residue by fly ash Download PDFInfo
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- CN101844770A CN101844770A CN 201010161914 CN201010161914A CN101844770A CN 101844770 A CN101844770 A CN 101844770A CN 201010161914 CN201010161914 CN 201010161914 CN 201010161914 A CN201010161914 A CN 201010161914A CN 101844770 A CN101844770 A CN 101844770A
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- hydrochloric acid
- carbon black
- aluminum
- ash
- white carbon
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000006229 carbon black Substances 0.000 title claims abstract description 22
- 239000010881 fly ash Substances 0.000 title abstract description 41
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 title abstract 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 12
- 230000032683 aging Effects 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000005245 sintering Methods 0.000 claims abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 38
- 239000002956 ash Substances 0.000 claims description 19
- 239000000446 fuel Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 235000017550 sodium carbonate Nutrition 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000010883 coal ash Substances 0.000 claims description 8
- 239000000084 colloidal system Substances 0.000 claims description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000003292 diminished effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000011085 pressure filtration Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 230000003252 repetitive effect Effects 0.000 claims description 2
- 238000005201 scrubbing Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 18
- 239000000377 silicon dioxide Substances 0.000 abstract description 16
- 238000000605 extraction Methods 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000003921 oil Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229960001866 silicon dioxide Drugs 0.000 description 19
- 239000000047 product Substances 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000012808 vapor phase Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011246 composite particle Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 229910021392 nanocarbon Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 125000005624 silicic acid group Chemical group 0.000 description 1
- -1 silicon ion Chemical class 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing white carbon black through extracting aluminum residue by fly ash, which comprises the following steps: carrying out mixed sintering on the fly ash and sodium carbonate; carrying out acid solution ageing, filtering watering and drying dewatering; and obtaining the white carbon black. The content of SiO2 in the obtained white carbon black is greater than 90 wt percent, the BET specific surface area is greater than 200 m<2>/g, and the oil absorption value is greater than 3.0 ml/g. The invention carries out sufficient extraction and utilization on silicon dioxide in the aluminum residue extracted by the fly ash, the integrated utilization rate of the fly ash is improved, and the waste slag discharge amount is reduced. The method is simple, is applicable to the extraction of silicon dioxide from the fly ash of circulating fluid beds, is convenient for industrial application, and has no pollution.
Description
Technical field
The invention belongs to the utilization of fly ash field, relate to a kind of method of utilizing residue of aluminum-extracted pulverized fuel ash to prepare white carbon black.
Background technology
White carbon black is an amorphous silicon di-oxide, has another name called hydrated SiO 2, have nontoxic, porousness, high dispersive, light weight, chemical stability good, high temperature resistant, do not burn and excellent properties such as electrical insulating property is good.Therefore, white carbon black all has application in the various fields of material, as: rubber industry, plastics industry, paper industry, chemically machinery polished, ultra-fine composite particles etc.
Flyash is the waste that the coal-burning power plant discharges, China is to be the country of main energy sources with coal, annual flyash from power plant emission is up to more than one hundred million tons, a large amount of soils are are not only occupied in the discharging of flyash, and serious environment pollution, how to handle and utilize flyash to become an important problems.On the other hand, contain multiple utilizable component in the flyash, as aluminum oxide and silicon-dioxide.In resource poor day by day today, extracting materials such as aluminum oxide, silicon oxide from flyash is the effective way that makes flyash turn waste into wealth, fully utilize, and has good social benefit and economic benefit.
According to the difference of calcination condition, flyash can be divided into coal-powder boiler flyash and circulating fluid bed coal ash.Coal-powder boiler flyash generates (1400～1600 ℃) through high-temp combustion, and alumina component wherein is the mineral forms of vitreous state or high temperature aluminum-containing mineral mullite crystal, corundum crystal and exists, and stability is very high; And circulating fluidized bed ash temperature of combustion is about 850 ℃, and more traditional coal dust ashes temperature of combustion reduces greatly.The difference of temperature of combustion has determined circulating fluidized bed ash and the traditional essential difference of coal-powder boiler flyash in the thing phase composite, the main thing phase composite of circulating fluidized bed ash is amorphous metakaolinite, and its main chemical constitution silicon-dioxide, aluminum oxide and ferric oxide all have good active.
The method of extracting silicon oxide at present from flyash roughly can be divided into vapor phase process and alkaline process two big classes.Vapor phase process is that flyash and fluorochemical and strong sulfuric acid response are made silicon fluoride gas, make silicon-dioxide through hydrolysis then, as patent " a kind of utilize the method that flyash produces white carbon black, coal dust and aluminium hydroxide (publication number: CN10214961A) ", " based on gas phase sol gel method by the method for fly-ash Preparation Nano carbon white (publication number: CN1915811A) ", " method of flyash preparing nano silicon dioxide by vapor phase process (publication number: CN1807240A) " all be to adopt vapor phase process to extract silicon-dioxide from flyash.Can obtain highly purified silicon-dioxide with vapor phase process, but employed fluorochemical cost height in the reaction pollutes to environment easily, also higher to the requirement of equipment.Alkaline process is that flyash and yellow soda ash etc. are at high temperature calcined, or the direct and sodium hydroxide solution reaction with flyash.With the reaction process of alkali in aluminum oxide and silicon oxide in the flyash be activated simultaneously, therefore need further acidifying (by carbonation reaction or with sulfuric acid/hydrochloric acid reaction) sial is separated.As patent " a kind of utilize flyash produce silicon-dioxide and method of alumina (publication number: CN10149935A) ", " utilize aluminous fly-ash produce aluminum oxide and white carbon black process for cleanly preparing (publication number: CN101041450A) ", " utilize flyash produce aluminium hydroxide and silicic acid processing method (publication number: CN101172634A) ", " method of extraction high purity aluminium oxide and silica gel from flyash (publication number: CN10254933A) ", " a kind of from flyash firstly extracting silicon and secondly extracting aluminum method (publication number: CN101125656A) ", " a kind of method of from flyash or slag, extracting white carbon black (publication number: CN101306819A) ", " method of preparing white carbon black from secondary carbon component (publication number: CN101077777A) ", " method of usefulness fly-ash Preparation white carbon black and pure zeolite molecular sieve (publication number: CN1911800A) ", " a kind of with inorganic mineral prepare aerosil method (publication number: CN10224890) ", " a kind of silicon-dioxide that from aluminous fly-ash, extracts; and the method for aluminum oxide and gallium oxide (publication number: CN101284668) " all be to utilize alkaline process from flyash, to extract silicon-dioxide.Alkaline process, especially yellow soda ash sintering process are suitable for the lower coal-powder boiler flyash of reactive behavior.For the higher circulating fluid bed coal ash of activity, can be without direct calcining and activating, and adopt the molten method of acid that alumina extraction is wherein come out, since acid not can with the silicon dioxde reaction in the flyash, after solid-liquid separation, the residue of aluminum-extracted main component that obtains is a silicon-dioxide, prepares white carbon black with it.Since in extracting alumina process with former flyash in most silicon-aluminum chemistry key destroy, therefore from residue of aluminum-extracted pulverized fuel ash, extract silicon-dioxide and directly from flyash, extract silicon-dioxide and compare, the silicon dioxde reaction activity is stronger, and extraction yield is also higher.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing residue of aluminum-extracted pulverized fuel ash to produce white carbon black.
Method of the present invention is divided into 4 steps: the yellow soda ash sintering, and sour molten ageing, filtration washing, drying and dehydrating is specially:
(1) yellow soda ash sintering: is 1: 1.0～1: 1.6 with residue of aluminum-extracted pulverized fuel ash and yellow soda ash by mass ratio, preferred 1: 1.2～1: 1.4 mixed is even, place rotary kiln, be heated to 750～900 ℃, preferred 800～850 ℃, this thermotonus 20～40 minutes, make the residue of aluminum-extracted fusion;
(2) molten, the ageing of acid: product to be sintered is cooled to room temperature～90 ℃, after preferred 60～80 ℃, to wherein adding mass concentration is 1～8%, preferred 3～6% dilute hydrochloric acid, the ratio of hydrochloric acid and sinter adds 4～8 liters for the per kilogram sinter, preferred 5～7 liters of hydrochloric acid, regulator solution pH value is 3.5～4.5, makes the non-silicon ion in the residue exist silicon then to exist with the silicic acid form with halide mode; Room temperature ageing 2～10 hours fully precipitates silica gel;
(3) solid-liquid separation, washing: after ageing, the silica gel precipitation is separated with solution by pressure filtration or filtration under diminished pressure, and extremely neutral to the colloid repetitive scrubbing that obtains;
(4) drying and dehydrating: the colloid after will washing adds water and is mixed with that to contain admittedly be 10～40wt%, and the slip of preferred 25～35wt% carries out spraying drying at 80～100 ℃, promptly obtains the white carbon black product.
As preferred implementation, the flyash that the present invention uses is circulating fluid bed coal ash, and the residue of aluminum-extracted pulverized fuel ash of use is that circulating fluid bed coal ash extracts the solid residue that obtains behind the aluminum oxide through hydrochloric acid or sulfuric acid solution.
SiO in the product white carbon black
2Content is greater than 90wt%, and the BET specific surface area is greater than 200m
2/ g, oil-absorption(number) satisfy the requirement of white carbon black HB/T3061 greater than 3.0ml/g.
Usefulness of the present invention is, the silicon-dioxide in the residue of aluminum-extracted pulverized fuel ash has been carried out abundant extraction and application, improved comprehensive utilization rate of coal ash, reduced the waste sludge discharge amount; Method is simple and easy, is suitable for silicon-dioxide extraction in the circulating fluid bed coal ash, is convenient to industrial application, does not pollute.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method.
Embodiment
In conjunction with embodiment explanation the present invention, but the present invention is not limited to following examples.
The residue of aluminum-extracted that raw material adopts circulating fluid bed coal ash to obtain after hydrochloric acid acid is molten, its chemical ingredients is as shown in table 1:
Table 1 residue of aluminum-extracted pulverized fuel ash chemical ingredients (wt%)
| ??SiO 2 | ??Al 2O 3 | ??TiO 2 | ??CaO | ??MgO | ??Fe 2O 3 | ??FeO | ??K 2O | ??Na 2O | ??LOS | Summation |
| ??61.24 | ??16.66 | ??1.48 | ??0.20 | ??0.046 | ??0.12 | ??0.16 | ??0.16 | ??0.10 | ??17.24 | ??97.41 |
Embodiment 1
Is 1: 1.3 mixed with residue of aluminum-extracted pulverized fuel ash and yellow soda ash by mass ratio, places rotary kiln, 840 ℃ of reactions 30 minutes, makes the residue of aluminum-extracted fusion.After product to be sintered is cooled to room temperature, be 5% dilute hydrochloric acid to wherein adding mass concentration, the ratio of hydrochloric acid and sinter is that the per kilogram sinter adds 6 liters of hydrochloric acid, and regulator solution pH value is 4.0.The room temperature ageing is filtration under diminished pressure after 6 hours, and the silica gel precipitation is separated with solution, and washed silica gel is to neutral.Colloid after the washing is added water be deployed into that to contain admittedly be 30% slurry, can obtain the white carbon black product 80 ℃ of spraying dryings.After measured, SiO in the product
2Content is that 95.7wt%, specific surface area are 256m
2/ g, oil-absorption(number) 3.1ml/g.
Embodiment 2
Is 1: 1.2 mixed with residue of aluminum-extracted pulverized fuel ash and yellow soda ash by mass ratio, places rotary kiln, 830 ℃ of reactions 30 minutes, makes the residue of aluminum-extracted fusion.After product to be sintered is cooled to 60 ℃, be 4% dilute hydrochloric acid to wherein adding mass concentration, the ratio of hydrochloric acid and sinter is that the per kilogram sinter adds 5 liters of hydrochloric acid, and regulator solution pH value is 4.0.The room temperature ageing is filtration under diminished pressure after 10 hours, is washed to neutrality.Colloid after the washing is deployed into to contain admittedly be 25% slurry, carries out spraying drying, can obtain the white carbon black product at 90 ℃.After measured, SiO in the product
2Content is that 94.4wt%, specific surface area are 227m
2/ g, oil-absorption(number) 3.0ml/g.
Embodiment 3
Is 1: 1.4 mixed with residue of aluminum-extracted pulverized fuel ash and yellow soda ash by mass ratio, places rotary kiln, 800 ℃ of reactions 40 minutes.After product to be sintered is cooled to 80 ℃, be 6% dilute hydrochloric acid to wherein adding mass concentration, the ratio of hydrochloric acid and sinter is that the per kilogram sinter adds 7 liters of hydrochloric acid, and regulator solution pH value is 3.5.Room temperature ageing pressure filtration after 10 hours is washed to neutrality.Colloid after the washing is deployed into to contain admittedly be 35% slurry, carries out spraying drying, can obtain the white carbon black product at 90 ℃.After measured, SiO in the product
2Content is that 95.9wt%, specific surface area are 243m
2/ g, oil-absorption(number) 3.1ml/g.
Claims (8)
1. method of utilizing residue of aluminum-extracted pulverized fuel ash to produce white carbon black is characterized in that described method comprises:
(1) yellow soda ash sintering: is that 1: 1.0～1: 1.6 mixed is even with residue of aluminum-extracted pulverized fuel ash and yellow soda ash by mass ratio, places rotary kiln, 750～900 ℃ of reactions 20～40 minutes, sintered product;
(2) molten, the ageing of acid: after product to be sintered is cooled to room temperature～90 ℃, be 1～8% dilute hydrochloric acid to wherein adding mass concentration, the ratio of hydrochloric acid and sintered product is 4～8 liters of hydrochloric acid of per kilogram sinter adding, and regulator solution pH value is 3.5～4.5; Room temperature ageing 2～10 hours;
(3) solid-liquid separation, washing: by pressure filtration or filtration under diminished pressure the silica gel precipitation is separated with solution, and extremely neutral to the colloid repetitive scrubbing that obtains;
(4) drying and dehydrating: the colloid after will washing adds water and is mixed with that to contain admittedly be the slip of 10～40wt%, carries out spraying drying at 80～100 ℃.
2. method according to claim 1 is characterized in that, residue of aluminum-extracted pulverized fuel ash and yellow soda ash mass ratio are 1: 1.2～1: 1.4 in the step (1).
3. method according to claim 1 is characterized in that, the Heating temperature in the step (1) is 800～850 ℃.
4. method according to claim 1 is characterized in that, sintered product is cooled to 60～80 ℃ in the step (2).
5. method according to claim 1 is characterized in that, in the step (2), the adding mass concentration is 3～6% dilute hydrochloric acid in sintered product.
6. method according to claim 1 is characterized in that, in the step (2), the ratio of hydrochloric acid and sinter adds 5～7 liters of hydrochloric acid for the per kilogram sinter.
7. method according to claim 1 is characterized in that, in the step (4), the colloid after the washing adds water and is mixed with that to contain admittedly be the slip of 25～35wt%.
8. according to any described method of claim 1-7, it is characterized in that residue of aluminum-extracted pulverized fuel ash is that circulating fluid bed coal ash extracts the solid that obtains behind the aluminum oxide through hydrochloric acid or sulfuric acid solution.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502662A (en) * | 2011-11-09 | 2012-06-20 | 段甲明 | Method for preparing precipitated white carbon black by using waste slag for producing ferrovanadium |
| CN103803564A (en) * | 2013-12-13 | 2014-05-21 | 中国神华能源股份有限公司 | Method for preparing silicon dioxide micropowder by using pulverized fuel ash extracted aluminum residue as raw material and silicon dioxide micropowder |
| CN103833042A (en) * | 2013-12-13 | 2014-06-04 | 中国神华能源股份有限公司 | Method for preparing silicone oxide micro powder by using residues after extracting aluminum from fly ash, and silicone oxide micro powder |
| CN105967231A (en) * | 2016-06-22 | 2016-09-28 | 中国神华能源股份有限公司 | Method for extracting TiO2 from white clay |
| CN108658451A (en) * | 2011-02-22 | 2018-10-16 | 赢创德固赛有限公司 | The high-purity silicon dioxide granule applied for quartz glass and the method for preparing the particle |
| CN110902703A (en) * | 2019-12-27 | 2020-03-24 | 神华准能资源综合开发有限公司 | Method for producing alumina and recovering rare earth elements by using coal ash hydrochloric acid method |
| CN110963496A (en) * | 2019-12-18 | 2020-04-07 | 昆明理工大学 | Method for synthesizing ordered mesoporous silicon oxide by using fly ash |
| CN111690174A (en) * | 2020-07-10 | 2020-09-22 | 东莞市固泰有机硅有限公司 | Silicon rubber for rubber covered roller containing modified white carbon black and preparation method thereof |
| CN115626652A (en) * | 2022-11-03 | 2023-01-20 | 太原理工大学 | Preparation method of silicon-aluminum aerogel |
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| CN1911800A (en) * | 2006-08-31 | 2007-02-14 | 北京科技大学 | Method for preparing white carbon black and pure zeolite molecular sieve using flyash |
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| WO2008119212A1 (en) * | 2007-04-03 | 2008-10-09 | Pingshuo Industrial Ltd. | A method of extracting silica at first and then extracting alumina from fly ash |
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