CN102765724A - Preparation method of silica gel - Google Patents

Preparation method of silica gel Download PDF

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Publication number
CN102765724A
CN102765724A CN2012101218705A CN201210121870A CN102765724A CN 102765724 A CN102765724 A CN 102765724A CN 2012101218705 A CN2012101218705 A CN 2012101218705A CN 201210121870 A CN201210121870 A CN 201210121870A CN 102765724 A CN102765724 A CN 102765724A
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silica gel
water
hydrogel
solution
make
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章浩龙
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ZHEJIANG YUDA CHEMICAL INDUSTRY Co Ltd
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ZHEJIANG YUDA CHEMICAL INDUSTRY Co Ltd
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Abstract

The invention discloses a preparation method of silica gel. According to the preparation method, a raw material NaHCO3 or NH4HCO3 reacts with sodium silicate Na2O.nSiO2 to generate SiO2 hydrogel, which undergoes moulding, aging and drying processes to prepare silica gel. When the raw materials are sodium silicate Na2O.nSiO2 and NaHCO3, their mol ratio is 1:2-2.4. When the raw materials are Na2O.nSiO2 and NH4HCO3, their mol ratio is 1:1-1.2. By the adoption of the above technical scheme, as a recovered washing lotion (or filtrate) mainly contains Na2CO3 (or also contains NH3.H2O), CO2 can be added to perform a reaction so as to regain reaction raw materials. Therefore, recycling is realized, raw material cost is reduced, few resources are consumed, sulfuric acid consumption is avoided, and the damage to the environment is minimized.

Description

A kind of preparation method of silica gel
Technical field
The present invention relates to a kind of method of producing silica gel, belong to chemical technology field.
Background technology
Silica gel is the silica xerogel with three-dimensional space net structure.The genus polyporus material has very big internal surface area and specific micro pore volume, and this specific character makes it become important siccative, adsorptivity and support of the catalyst etc.
About the production of silica gel, " production of silicon compound and application " (No. 015, (river) Xindeng word) 187-203 page or leaf of distribution press of Chengdu Univ. of Science & Technology in May, 1994 than the introduction of detail the production technique of silica gel, principle and relevant device.
It is water glass and sulfuric acid that current technology is produced the used raw material of silica gel, and its reaction formula is following:
Na 2O·nSiO 2+H 2SO 4+(nx-1)H 2O→nSiO 2·xH 2O↓+Na 2SO 4
Through different parameter control, can prepare the silica gel kind of different grain size, shape, pore property.
Produce silica gel by this process method, except consuming water glass, also need consume a certain amount of sulfuric acid as the silicon source.Except the cost that sulfuric acid consumption produces, another problem that can not be ignored is that after reaction was accomplished, these acid can generate corresponding inorganic salt Na 2SO 4One ton of silica gel of general every production can produce 0.8 ton of Na 2SO 4, and remaining a small amount of sulfuric acid, because the factor of aspects such as the concentration and the cost of technology, these saliferous acid-bearing wastewater cost recovery are higher, the value of regenerant is little again, inevitably can discharge great amount of wastewater.
Because above-mentioned technology need consume sulfuric acid, producing a large amount of saliferous acid-bearing wastewaters can't circulate or recycle, and exists production cost higher, causes problems such as environmental pollution simultaneously.
Summary of the invention
To the problems referred to above, the problem that quasi-solution of the present invention is determined provides a kind of silica removal source (water glass Na 2OnSiO 2) outside, the process method of producing silica gel that other chemical can recycle to reduce the manufacturing cost of silica gel, is lacked consumption of natural resource simultaneously, reduces discharging, reduces the infringement to environment as far as possible.
For achieving the above object, the present invention adopts following technical scheme: a kind of preparation method of silica gel, it is with NaHCO 3Or NH 4HCO 3Be raw material and water glass Na 2OnSiO 2Reaction generates SiO 2Hydrogel makes silica gel through moulding, aging, drying process, and said raw material is water glass Na 2OnSiO 2And NaHCO 3The time, the mol ratio of the two is 1: 2～2.4; Said raw material is water glass Na 2OnSiO 2And NH 4HCO 3The time, the mol ratio of the two is 1: 1～1.12; Said water glass Na 2OnSiO 2Modulus m be 2.2～3.7.
The preparation method of above-mentioned silica gel, it can make silica gel through following steps:
1) prepare the aqueous solution of two kinds of raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) mixing step 1) two kinds of solution getting ready, make its reaction generate SiO 2Hydrogel gets into the ageing tank insulation then and wears out;
3) gel detergent: the hydrogel after will wearing out is packaged goes in the washing bath, with tap water or deionized water or contain NH 4HCO 3Tap water wash, divide and to remove wash water, to slough contained salt;
4) drying: the hydrogel that will wash after the desalting treatment takes out, and again through dry, promptly obtains the block silica gel finished product behind the trickle; Washing water reclaim and supply manipulation of regeneration to use;
Feed CO in the said wash water 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.After the said gel detergent desalination, also with containing rare H 2SO 4Tap water carried out immersion treatment.
Also can make silica gel through following steps:
1) prepare the aqueous solution of two raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) two solution short mix in the nozzle of jet mixer that step 1) is obtained forms unsettled silicate solution, sends into moulding in the moulding oil column then; Or adopt no oily forming technique in the air set moulding, and take out of by recirculated water after the moulding, in washing bath, soak; Separate then; Hydrogel send the next step operation, and recirculated water intermittently reclaims the confession manipulation of regeneration, and wash water can be used for replenishment cycles water;
3) with step 2) hydrogel that obtains uses the dilute sulphuric acid immersion treatment, after the processing, to the hydrogel of forming oil column with synthesis of detergent liquid rinsing greasy dirt, reusable heat water washing; To with no oily moulding without the washings rinsing, directly use hot wash, all be washed till wash water closely neutrality;
4) hydrogel after the hot wash is handled through oven dry, can obtain spherical silica gel.
Feed CO in the said recirculated water 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
Step 2) obtain hydrogel after, also hydrogel is carried out burin-in process with steam.
Also can make silica gel through following steps:
1) prepare the aqueous solution of two raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) two solution short mix in the nozzle of jet mixer that step 1) is obtained; Form unsettled silicate solution, send into moulding in the moulding oil column then, take out of by recirculated water after the moulding; In washing bath, soak; Separate then, recirculated water reclaims and supplies manipulation of regeneration, and hydrogel send the next step operation;
3) with step 2) hydrogel that obtains uses rare H 2SO 4Solution soaking is aging, again through washing, ammonia bubble, drying, activation, sieve and be packaged to be the silica gel finished product.
Feed CO in the affiliated recirculated water 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
Can also make silica gel through following steps:
1) prepare the aqueous solution of two raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) two solution that obtain step 1) mix in reaction kettle and obtain SiO 2Hydrogel through aging, filter to divide and goes filtrating, and filtrating recovery supplies manipulation of regeneration, and filter cake is used water washing earlier, again with containing H 2SO 4Water washing, again with washing nearly neutrality, filter the filter cake after obtaining cleaning;
3) step 2) obtain clean after filter cake wear into other homogenizers with colloid and make rubber cement levigate, with obtaining the silica gel finished product after the spray-dryer drying.
Feed CO in the said filtrating 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
Adopt technique scheme, the preparation method of glue glue of the present invention, it is with water glass Na 2OnSiO 2With NaHCO 3Or NH 4HCO 3For raw material reacts, be settled out SiO 2Hydrogel makes silica gel product through operations such as moulding, aging, dryings again.Mainly contain Na in (or filtrating etc.) because the washing lotion that reclaims 2CO 3(or also contain NH 3H 2O), can be through feeding CO 2Reaction regains reaction raw materials, so outside the silica removal source, other chemical all can recycle; Compared with prior art, technology of the present invention has reduced the raw materials cost of silica gel, few consumption of natural resource; Avoid prior art need consume sulfuric acid, and produced and to contain sour brine waste, caused problems such as environmental pollution; Reduce discharging, reduced infringement environment.
Certainly, this patent technology needs to use carbonic acid gas in addition, but carbonic acid gas can effectively utilize dioxide gas as a kind of main gas that causes global greenhouse effect, to the same positive effect of preserving the ecological environment.
Below technique scheme is done some concise and to the point analysis, under the first brief account as the primary raw material sodium metasilicate in silicon source.
Water glass, popular name water glass, commodity are called sodium silicate, and molecular formula can be write: Na 2OnSiO 2, n is SiO 2With Na 2The mol ratio of O often is called modulus, and the modulus of general water glass product is 2.2～3.7.
Water glass very easily reacts with acid and separates out silicon-dioxide, and the front has been write Na 2OnSiO 2With H 2SO 4The equation of reaction, but in fact, Na 2OnSiO 2Even ability and NH 4 +Such weak acid (Lewis acid) reaction:
Na 2O·nSiO 2+2NH 4Cl+(nx-1)H 2O→nSiO 2·xH 2O↓+2NaCl+2NH 3
Here, NH 4 +Be as an acid:
Figure BSA00000706117900051
PKa＝9.25
Similar, Na 2OnSiO 2Also can with HCO 3 -Reaction:
Na 2O·nSiO 2+NH 4HCO 3+(nx-1)H 2O→nSiO 2·xH 2O↓+Na 2CO 3+NH 3Na 2O·nSiO 2+2NaHCO 3+(nx-1)H 2O→nSiO 2·xH 2O↓+2Na 2CO 3
Figure BSA00000706117900052
PKa＝10.3
This is a reaction principle of the present invention.
The Na that reaction generates 2CO 3Or/and NH 3With CO 2Reaction can generate NaHCO 3Or/and NH 4HCO 3, recyclable recycling:
Na 2CO 3+H 2O+CO 2＝2NaHCO 3
NH 3+H 2O+CO 2＝NH 4HCO 3
Can know that according to above explanation the present invention mainly is to be raw material with sodium silicate, NaHCO 3Or NH 4HCO 3Deng starting material reuse all capable of circulation, only need to replenish CO 2The technology continous-stable is carried out, not only significantly reduced the manufacturing cost of aerosil, also significantly reduce the discharging of waste water, and effectively utilize the CO that causes global greenhouse effect 2Gas helps protecting ecology and environment.
Other explains, for practicing thrift length, in following embodiment; To same or analogous with current technology; Include the content that pertinent literature was specifically discussed, only work is briefly bright, will mainly illustrate the partial content that differs greatly with current technology here.
Embodiment
Embodiment 1
Getting a kind of degree Beaume is the water glass of 52 ° of Be ' (20 ℃, down together), and the water that adds 5 times of amounts (weight, down together) dilutes, filters, and records diluent and contains SiO 2%=4.9%, Na 2O%=2.3%, its modulus n=2.2 takes by weighing this dilute solution 600g, under agitation with the NaHCO of 1200g 3.1% 3Solution mixes (the reaction mol ratio is 1: 2.0), continues stir about 1hr, staticly settle 12 hours after, pour out about 1200 grams of supernatant liquid, subsequent use.Lower sediment part is with tap water washing 3～4 times, and the pH value of using sulfuric acid acidation again is 3～4 tap water washing, with the tap water soaked in water gel of sulfur acid about 0.02% 24 hours, pulls out then, behind the trickle, obtains silica gel product through drying.
Pour out in the subsequent use clear liquid on aforesaid upper strata, feed CO 2Reaction, the about 1200g solution after reaction is accomplished is NaHCO through detecting 3The aqueous solution, wherein NaHCO 3Content be 4.1%, be enough to satisfy the requirement recycle.
Embodiment 2
Get the water glass that a kind of degree Beaume is 36 ° of Be ', add water dilution, the filtration of 4 times of amounts, record diluent and contain SiO 2%=4.85%, Na 2O%=1.36%, its modulus n=3.7 takes by weighing this dilute solution 600g, under agitation with the NH of 800g 1.3% 4HCO 3Solution mixes (the reaction mol ratio is 1: 1.0), continues stir about 1hr, staticly settle 36 hours after, pour out about 800 grams of supernatant liquid, subsequent use.The lower sediment part is with tap water washing 3～4 times, again with containing 0.15%NH 3Tap water washing, soak 3～4 times, pull out, behind the trickle, obtain silica gel product through oven dry.
Pour out in the subsequent use clear liquid on aforesaid upper strata, feed CO 2Reaction, reaction obtains about 800g solution after accomplishing, through verifying as NaHCO 3And NH 4HCO 3Mixing solutions wherein contains NaHCO through detecting 3Be about 1.5%, contain NH 4HCO 3Be about 0.7%, NaHCO 3And NH 4HCO 3All can obtain SiO with the water glass reaction 2Hydrogel, and present in an amount at least sufficient to satisfy the requirement that the present embodiment technological cycle is used.
Embodiment 3
Get the water glass that a kind of degree Beaume is 41 ° of Be ', add water dilution, the filtration of 3 times of amounts, record diluent and contain SiO 2%=6.5%, Na 2O%=2.1%, its modulus n=3.2 is with the NaHCO of this dilute solution and 6.8% 3Solution with about 1: 1 ratio mixed at high speed (the reaction mol ratio is about 1: 2.4), gets in the turbine oil oil column through distributing umbrella in the nozzle of jet mixer, is taken out of by the recirculated water of shaping column bottom, and circulating water temperature is at 40～50 ℃.The spherical hydrogel entering sieve of being taken out of by recirculated water is separated.
Isolated hydrogel is handled with 2.3% dilute sulfuric acid solution, used synthesis of detergent liquid rinsing greasy dirt then, use again that acid content is 4～6 * 10 in 40～60 ℃ hot water wash to the micelle -5, pull out, handle through oven dry again, promptly obtain the silica gel finished product.
Circulating water system is connected with the reverse osmosis unit intermittent type, regularly opens reverse osmosis unit, the dense water end (W.E.) outlet of control reverse osmosis unit Na 2CO 3Content is about 4.3%, and water purification brings out water and returns circulating water system, and the recirculated water insufficient section can replenish with tap water.
In the liquid concentrator that r-o-is come out, feed CO 2, with the Na in the solution 2CO 3Reaction generates NaHCO 3, reaction is accomplished after detection wherein contains NaHCO 3Be about 6.8%, get wherein about 2/3 amount and can satisfy this reactive system NaHCO 3The amount of recycling of raw material, redundance can further concentrate recovery.
Embodiment 4
Get the water glass that a kind of degree Beaume is 41 ° of Be ', add water dilution, the filtration of 3 times of amounts, record diluent and contain SiO 2%=6.5%, Na 2O%=2.0%, its modulus n=3.4 is with the NaHCO of this dilute solution and 6.0% 3Solution with about 1: 1 ratio mixed at high speed (the reaction mol ratio is about 1: 2.2), gets in the turbine oil oil column through distributing umbrella in the nozzle of jet mixer, is taken out of by the recirculated water of shaping column bottom, and circulating water temperature is at 40～50 ℃.The spherical hydrogel entering sieve of being taken out of by recirculated water is separated.
Isolated hydrogel is handled with 1.5% dilute sulfuric acid solution, handled 10 hours with steam aging then.Rare synthesis of detergent liquid rinsing greasy dirt with 0.2% dilute sulphuric acid immersion 12 hours, is used again in aging back in washing bath, use that acid content is 4～6 * 10 in 40～60 ℃ of hot water wash to micelles again -5, pull out, handle through oven dry again, promptly obtain the silica gel finished product.
Circulating water system is connected with the reverse osmosis unit intermittent type, regularly opens reverse osmosis unit, and the control reverse osmosis concentrated water brings out a mouthful Na 2CO 3Content is about 3.8%, and water purification brings out water and returns circulating water system, and the recirculated water insufficient section can replenish with tap water.
In the liquid concentrator that r-o-is come out, feed CO 2, with the Na in the solution 2CO 3Reaction generates NaHCO 3, reaction is accomplished after detection wherein contains NaHCO 3Be about 6.0%, get wherein about 2/3 amount and can satisfy this reactive system NaHCO 3The amount of recycling of raw material, redundance can further concentrate recovery.
Embodiment 5
Get the water glass that a kind of degree Beaume is 46 ° of Be ', add water dilution, the filtration of 3 times of amounts, record diluent and contain SiO 2%=6.5%, Na 2O%=2.5%, its modulus n=2.7; NH 4HCO 3Be mixed with 3.8% solution.Above-mentioned two kinds of solution are pressed into respectively with about 1: 1 ratio in the nozzle of jet mixer mix, reaction (the reaction mol ratio is about 1: 1.2); Spray through nozzle; Form tiny drop and get in the oil column, under action of gravity, fall into water layer, take out of by recirculated water by oil reservoir; Separate through sieve; Recirculated water returns the water of mixing tank, through the spherical hydrogel that sieve is told get in the treatment trough with tap water soak, aging, obtain the silica gel finished product through acid bubble, washing desalination, ammonia bubble, dry, activation and screening again.
Regularly detect Na in the recirculated water 2CO 3Content is as Na wherein 2CO 3Content surpasses at 1% o'clock, delivers to recirculated water in the reactor drum, adds in the recirculated water with the soaked in water of hydrogel in the treatment trough, and water can be supplied by tap water in the treatment trough.
In the recirculated water that joins reactor drum, feed CO 2, with the Na in the recirculated water 2CO 3Reaction generates NaHCO 3, reaction is accomplished after filtration, purification is sent into reverse osmosis unit, and the control reverse osmosis concentrated water brings out a mouthful NaHCO 3Content is about 4.6～4.7%, and water purification brings out water and returns circulating water system.
Collect reverse osmosis concentrated water and bring out a mouthful liquid, it is NaHCO through check 3And NH 4HCO 3Mixing solutions, detect and wherein to contain NaHCO 3Be about 4.6%, contain NH 4HCO 3Be about 1.7%, NaHCO 3And NH 4HCO 3All can obtain SiO with the water glass reaction 2Hydrogel, and present in an amount at least sufficient to satisfy the requirement that technological cycle of the present invention is used.
Embodiment 6
Get the water glass that a kind of degree Beaume is 42 ° of Be ', add water dilution, the filtration of 4 times of amounts, record diluent and contain SiO 2%=4.4%, Na 2O%=1.9%, its modulus n=2.4 takes by weighing this dilute solution 600g, under agitation with the NH of 800g 2.0% 4HCO 3Solution mixes (the reaction mol ratio is 1: 1.1), does not have SiO in the liquid phase basically to checking 2, continued stir about 20 minutes, filter, with clear water washing precipitation 2～3 times, wash the back filter cake and pull an oar, fully disperse with the high speed shear mulser, use the spray-dryer drying again after, promptly obtain the silica gel finished product.
Collect filtering filtrating, to wherein feeding CO 2Reaction, reaction obtains about 800g solution after accomplishing, and it is NaHCO through check 3And NH 4HCO 3Mixing solutions, detect and wherein to contain NaHCO 3Be about 2.2%, contain NH 4HCO 3Be about 1.1%, NaHCO 3And NH 4HCO 3All can obtain SiO with the water glass reaction 2Hydrogel, and present in an amount at least sufficient to satisfy the requirement that present embodiment recycles.

Claims (11)

1. the preparation method of a silica gel is characterized in that it is with NaHCO 3Or NH 4HCO 3Be raw material and water glass Na 2OnSiO 2Reaction generates SiO 2Hydrogel makes silica gel through moulding, aging, drying process, and said raw material is water glass Na 2OnSiO 2And NaHCO 3The time, the mol ratio of the two is 1: 2～2.4; Said raw material is water glass Na 2OnSiO 2And NH 4HCO 3The time, the mol ratio of the two is 1: 1～1.12; Said water glass Na 2OnSiO 2Modulus m be 2.2～3.7.
2. the preparation method of silica gel according to claim 1 is characterized in that it is to make silica gel through following steps:
1) prepare the aqueous solution of two kinds of raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) mixing step 1) two kinds of solution getting ready, make its reaction generate SiO 2Hydrogel gets into the ageing tank insulation then and wears out;
3) gel detergent: the hydrogel after will wearing out is packaged goes in the washing bath, with tap water or deionized water or contain NH 4HCO 3Tap water wash, divide and to remove wash water, to slough contained salt;
4) drying: the hydrogel that will wash after the desalting treatment takes out, and again through dry, promptly obtains the block silica gel finished product behind the trickle; Washing water reclaim and supply manipulation of regeneration to use.
3. the preparation method of silica gel according to claim 2 is characterized in that in said wash water, feeding CO 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
4. according to the preparation method of claim 2 or 3 described silica gel, it is characterized in that after said gel detergent desalination, also with containing rare H 2SO 4Tap water carried out immersion treatment.
5. the preparation method of silica gel according to claim 1 is characterized in that it is to make silica gel through following steps:
1) prepare the aqueous solution of two raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) two solution short mix in the nozzle of jet mixer that step 1) is obtained forms unsettled silicate solution, sends into moulding in the moulding oil column then; Or adopt no oily forming technique in the air set moulding, and take out of by recirculated water after the moulding, in washing bath, soak; Separate then; Hydrogel send the next step operation, and recirculated water intermittently reclaims the confession manipulation of regeneration, and wash water can be used for replenishment cycles water;
3) with step 2) hydrogel that obtains uses the dilute sulphuric acid immersion treatment, after the processing, to the hydrogel of forming oil column with synthesis of detergent liquid rinsing greasy dirt, reusable heat water washing; To with no oily moulding without the washings rinsing, directly use hot wash, all be washed till wash water closely neutrality;
4) hydrogel after the hot wash is handled through oven dry, can obtain spherical silica gel.
6. the preparation method of silica gel according to claim 4 is characterized in that feeding CO in the said recirculated water 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
7. according to the preparation method of claim 4 or 5 described silica gel, it is characterized in that step 2) obtain hydrogel after, also hydrogel is carried out burin-in process with steam.
8. the preparation method of silica gel according to claim 1 is characterized in that it is to make silica gel through following steps:
1) prepare the aqueous solution of two raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) two solution short mix in the nozzle of jet mixer that step 1) is obtained; Form unsettled silicate solution, send into moulding in the moulding oil column then, take out of by recirculated water after the moulding; In washing bath, soak; Separate then, recirculated water reclaims and supplies manipulation of regeneration, and hydrogel send the next step operation;
3) with step 2) hydrogel that obtains uses rare H 2SO 4Solution soaking is aging, again through washing, ammonia bubble, drying, activation, sieve and be packaged to be the silica gel finished product.
9. the preparation method of silica gel according to claim 8 is characterized in that feeding CO in the said recirculated water 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
10. the preparation method of silica gel according to claim 1 is characterized in that it is to make silica gel through following steps:
1) prepare the aqueous solution of two raw materials, wherein behind the water glass thin up also through natural subsidence or filter operation to remove the water-insoluble in the solution;
2) two solution that obtain step 1) mix in reaction kettle and obtain SiO 2Hydrogel through aging, filter to divide and goes filtrating, and filtrating recovery supplies manipulation of regeneration, and filter cake is used water washing earlier, again with containing H 2SO 4Water washing, again with washing nearly neutrality, filter the filter cake after obtaining cleaning;
3) step 2) obtain clean after filter cake wear into other homogenizers with colloid and make rubber cement levigate, with obtaining the silica gel finished product after the spray-dryer drying.
11. the preparation method of silica gel according to claim 10 is characterized in that feeding CO in the said filtrating 2, make Na wherein 2CO 3Reaction generates NaHCO 3, or also make NH wherein 3Reaction generates NH 4HCO 3, circulation is as the raw material of producing silica gel.
CN2012101218705A 2012-04-19 2012-04-19 Preparation method of silica gel Pending CN102765724A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105858668A (en) * 2016-03-30 2016-08-17 广州市飞雪材料科技有限公司 Preparation method of silicon dioxide with high oil absorption value and high water absorption capacity for washing powder
CN107922200A (en) * 2015-12-15 2018-04-17 株式会社Lg化学 The preparation method of metal oxide silicon dioxide composite aerogel and metal oxide silicon dioxide composite aerogel prepared therefrom

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1221705A (en) * 1997-12-30 1999-07-07 化学工业部天津化工研究院 Prodn. method of spherical silica gel
CN1373086A (en) * 2001-12-21 2002-10-09 叶天润 Process for preparing both sodium carbonate and silica white
CN101323453A (en) * 2008-07-04 2008-12-17 武汉工程大学 Circulation novel process for preparing white carbon black

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1221705A (en) * 1997-12-30 1999-07-07 化学工业部天津化工研究院 Prodn. method of spherical silica gel
CN1373086A (en) * 2001-12-21 2002-10-09 叶天润 Process for preparing both sodium carbonate and silica white
CN101323453A (en) * 2008-07-04 2008-12-17 武汉工程大学 Circulation novel process for preparing white carbon black

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107922200A (en) * 2015-12-15 2018-04-17 株式会社Lg化学 The preparation method of metal oxide silicon dioxide composite aerogel and metal oxide silicon dioxide composite aerogel prepared therefrom
US10710884B2 (en) 2015-12-15 2020-07-14 Lg Chem, Ltd. Method of preparing metal oxide-silica composite aerogel and metal oxide-silica composite aerogel prepared thereby
CN105858668A (en) * 2016-03-30 2016-08-17 广州市飞雪材料科技有限公司 Preparation method of silicon dioxide with high oil absorption value and high water absorption capacity for washing powder
CN105858668B (en) * 2016-03-30 2017-03-22 广州市飞雪材料科技有限公司 Preparation method of silicon dioxide with high oil absorption value and high water absorption capacity for washing powder

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Application publication date: 20121107