CN100494055C - Method for preparing nanometer silicon dioxide using coal ash gas phase method - Google Patents
Method for preparing nanometer silicon dioxide using coal ash gas phase method Download PDFInfo
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- CN100494055C CN100494055C CNB2006100383803A CN200610038380A CN100494055C CN 100494055 C CN100494055 C CN 100494055C CN B2006100383803 A CNB2006100383803 A CN B2006100383803A CN 200610038380 A CN200610038380 A CN 200610038380A CN 100494055 C CN100494055 C CN 100494055C
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- flyash
- silicon dioxide
- nano silicon
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Abstract
The method to prepare amorphous nano SiO2 with coal ash in gas phase comprises: hydrolyzing the SiF4 in coal ash to prepare silica gel; and drying to obtain the product. The prepared white carbon black is flocculent and semi-transparent with specific surface area up to 100~400m2/g, has high chemical purity and dispersibility to absorb water and aggregate into particle in air, can dissolve in NaOH and HF solution, is stable to other chemical drug and thermostable, and has wide application with super performance.
Description
Technical field
The present invention relates to a kind of method for preparing armorphous nano silicon-dioxide.
Background technology
The white carbon black chemical name is a hydrated SiO 2, and molecular formula is SiO
2NH
2O is the silicon-dioxide of fine-powder shape or ultrafine particle shape, and initial size is less than 0.0003mm, and proportion is 2.319～2.653, and fusing point is 1750 ℃.White carbon black is that Germany developed as the sooty surrogate in the forties in 20th century, now has been widely used in industrial sectors such as rubber, shoemaking, paint, papermaking, synthetic resins and grease, rubber wherein, shoemaking consumption maximum.
Ten thousand t/a surplus the white carbon black overall throughput does not also reach 70 in the world at present, wherein the precipitator method are 660,000 t/a, vapor phase process be 60,000 t/a.The throughput maximum be Degussa Corporation of West Germany, the white carbon black overall throughput is 220,000 t/a, U.S. moral PPG company is only second to West Germany Degussa Corporation and belongs to the second place of the world.Production method has two kinds of dry method and wet methods.Dry method comprises vapor phase process and arc process, wet method fractional precipitation method and gel method.Because drying means difference, gel method divide the common dry class in position gentle gel-like again.
Summary of the invention
The objective of the invention is to propose a kind of is raw material with flyash cheaply, the method for preparing nano silicon dioxide by vapor phase process.
The present invention adopts the flyash hydrolysis to generate silica gel, and drying obtains nano silicon.
The concrete operational path of the present invention: after earlier flyash being soaked 0.1～3 hour through 15%～25% dilute sulphuric acid, again with flyash and dense H
2SO
4Press mass ratio and 1: 0.1～3 mix, place container, slowly add anhydrous hydrofluoric acids in-4 ℃～25 ℃, the gas that generates is imported in the hydrolysis device, add surface dispersant to hydrolysis device again and be hydrolyzed, last, with the white solid filtration that generates, the dry armorphous nano SiO of getting
2NH
2O.
The present invention utilizes the silicon tetrafluoride hydrolysis in the flyash to generate silica gel, and drying obtains nano silicon.Its raw materials cost is cheap, and technology is simple, is easy to production control.The white carbon black of producing is the amorphous cotton-shaped translucent solid of white, and is nontoxic, and very big specific surface area (100～400m is arranged
2/ g); In addition, high chemical purity of product and high dispersive performance, be gathered into particle after in air, absorbing water, can be dissolved in sodium hydroxide and the hydrofluoric acid, stable to other pharmaceutical chemicalss, high temperature resistant, do not burn, have very high electrical insulating property, very strong stability, reinforcement, thickening property and thixotropy are a kind of important chemical material, has higher surface activity, when being widely used in other materials such as rubber and mixing, demonstrating higher reinforcing effect and excellent physical characteristics, is transparent and the colored article indispensable material.
Present method is easy to production control, and production environment is compliance with environmental protection requirements more, can reduce production costs.
In addition: in order to produce the product that particle distribution is even, be difficult for reunion, the dispersion agent of adding and the weight ratio of flyash are 1: 0.1～4.
Above-mentioned surface dispersant can for ethanol, ethylene glycol, glycerol, sodium lauryl sulphate, citric acid at least any one.
When the ethanolic soln that adopts 40% was surface dispersant, hydrolysising condition was: under 10～60 ℃ of conditions, stirred 2～10 hours.
Description of drawings
Fig. 1 is that particle diameter is the TEM photo of the nano silicon of 6～8mn.
Fig. 2 is that particle diameter is the TEM photo of the nano silicon of 10～15mn.
Fig. 3 is that particle diameter is the TEM photo of the nano silicon of 15～20mn.
Fig. 4 is that particle diameter is the TEM photo of the nano silicon of 20～30mn.
Fig. 5 is that particle diameter is the TEM photo of the nano silicon of 80～100mn.
Embodiment
Method one:
Step 1:
Pre-treating fly ash: flyash was placed 15%～25% dilute sulphuric acid acid soak 0.1～3 hour, standby.
Step 2:
With 100kg flyash and 100kg～300kg CaF
2Drop into respectively in the reactor, after mixing, drip the dense H of 10kg～400kg to reactor
2SO
4, stirring reaction under-4 ℃～25 ℃ conditions imports the silicon tetrafluoride gas that generates in the hydrolysis device with pipeline.
Step 3:
Add 10kg～100kg surface dispersant to hydrolysis device, be hydrolyzed the white solid of generation.
Step 4:
White solid is filtered with 400 purpose plate-and-frame filter press, dry again, make pure white loose armorphous nano SiO at last
2XH
2O.
Method two:
Step 1:
Pre-treating fly ash: flyash was placed 15%～25% dilute sulphuric acid acid soak 0.1～3 hour, standby.
Step 2:
With 100kg flyash and the dense H of 10kg～300kg
2SO
4Drop into respectively in the reactor made of iron, under-4 ℃～25 ℃, slowly add 10～100kg anhydrous hydrofluoric acid, the silicon tetrafluoride gas that generates is imported in the hydrolysis device with pipeline.
Step 3:
Add 10～100kg surface dispersant to hydrolysis device, be hydrolyzed the white solid of generation.
Step 4:
White solid is filtered with 400 purpose plate-and-frame filter press, dry again, make pure white loose armorphous nano SiO at last
2XH
2O.
In above-mentioned two kinds of methods, surface dispersant can be any of ethanol, ethylene glycol, glycerol, sodium lauryl sulphate and citric acid, and can obtain particle diameter respectively is 6～8nm, 10～15nm, the armorphous nano SiO2nH of 20～30nm and 80～100nm
2O is shown in Fig. 1 to 5.
Surface dispersant also can be any two or three kinds or four kinds or five kinds of ethanol, ethylene glycol, glycerol, sodium lauryl sulphate and citric acid
Wherein, adopting 40% ethanolic soln is surface dispersant, and controlled temperature is at 10～60 ℃, heated and stirred 2～10 hours, and the particle grain size controlled amount is made as 6nm～100nm.
Claims (4)
1, the method for flyash preparing nano silicon dioxide by vapor phase process, adopt the flyash hydrolysis to generate silica gel, drying obtains nano silicon, it is characterized in that: after earlier flyash being soaked 0.1～3 hour through 15%～25% dilute sulphuric acid, again with flyash and dense H
2SO
4Press mass ratio and 1: 0.1～3 mix, place container, slowly add anhydrous hydrofluoric acids in-4 ℃～25 ℃, the gas that generates is imported in the hydrolysis device, add surface dispersant to hydrolysis device again and be hydrolyzed, last, with the white solid filtration that generates, the dry armorphous nano SiO of getting
2NH
2O.
2, according to the method for the described flyash preparing nano silicon dioxide by vapor phase process of claim 1, it is characterized in that: the surface dispersant of adding and the weight ratio of flyash are 1: 0.1～4.
3, according to the method for the described flyash preparing nano silicon dioxide by vapor phase process of claim 2, it is characterized in that: surface dispersant be ethanol, ethylene glycol, glycerol, sodium lauryl sulphate, citric acid at least any one.
4, according to the method for the described flyash preparing nano silicon dioxide by vapor phase process of claim 3, it is characterized in that: the ethanolic soln of employing 40% is a surface dispersant, and hydrolysising condition is: under 10 ℃～60 ℃ conditions, stirred 2～10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100383803A CN100494055C (en) | 2006-02-20 | 2006-02-20 | Method for preparing nanometer silicon dioxide using coal ash gas phase method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100383803A CN100494055C (en) | 2006-02-20 | 2006-02-20 | Method for preparing nanometer silicon dioxide using coal ash gas phase method |
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| CN1807240A CN1807240A (en) | 2006-07-26 |
| CN100494055C true CN100494055C (en) | 2009-06-03 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100287827A1 (en) * | 2009-05-13 | 2010-11-18 | Chandrashekhar Sonwane | Process for obtaining treated coal and silica from coal containing fly ash |
| CN105016343B (en) * | 2014-04-17 | 2017-07-11 | 中国科学院过程工程研究所 | A kind of method that utilization aluminous fly-ash prepares hydrophabic silica |
| CN106044784B (en) * | 2016-07-27 | 2018-07-10 | 陕西师范大学 | A kind of method using flyash production high-purity silicon dioxide |
| CN107697919A (en) * | 2017-11-21 | 2018-02-16 | 安徽伊法拉电气有限公司 | A kind of method that gas phase sol-gal process prepares Nano carbon white |
| CN111662484B (en) * | 2020-06-29 | 2021-10-01 | 江苏理工学院 | Method for processing and modifying casting dust into natural rubber reinforcing agent |
| CN112897530B (en) * | 2021-03-01 | 2022-10-14 | 内蒙古工业大学 | Method for efficiently dissolving silicate substances and extracting high-purity silicon oxide |
| CN115180626B (en) * | 2022-07-08 | 2023-05-16 | 太原理工大学 | High-hydrothermal stable mesoporous silicon oxide material and preparation method thereof |
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2006
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Non-Patent Citations (2)
| Title |
|---|
| 新气相法制白炭黑. 王钧等.硅酸盐通报，第3期. 2002 |
| 新气相法制白炭黑. 王钧等.硅酸盐通报，第3期. 2002 * |
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