CN103638745A - Method for improving filtering property of alkaline coal ash slurry - Google Patents
Method for improving filtering property of alkaline coal ash slurry Download PDFInfo
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- CN103638745A CN103638745A CN201310616913.1A CN201310616913A CN103638745A CN 103638745 A CN103638745 A CN 103638745A CN 201310616913 A CN201310616913 A CN 201310616913A CN 103638745 A CN103638745 A CN 103638745A
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- coal ash
- filter
- filter aid
- slip
- flocculant
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Abstract
The invention relates to a method for improving a filtering property of alkaline coal ash slurry. According to the method, the filtering property of the slurry is improved by adding filter aids, flocculating agents or surface active agents or a mixture of more than two types in a filtering process of the alkaline coal ash slurry, and the effective separation of the coal ash slurry can be realized. The method provided by the invention adopts multiple filter aids or addition agents, which are easily available and are easy to degrade (or resolve), the loss of coal ash dissolving/leaching elements (such as aluminum and iron) is not caused, other impurity elements are not introduced, the stabilization of a chemical constitution of original slurry is kept furthest, the use is convenient, the effect is good, the method is stable and reliable, and the industrialized popularization and application are realized.
Description
Technical field
The present invention relates to Ash Utilization and utilize field, especially flyash low-concentration alkali liquor extracts silica, flyash high-concentration alkali liquor is extracted the fields such as aluminium oxide, is specifically related to a kind of method that improves alkaline powder coal ash slurry filtration performance.
Background technology
Coal, as modal fossil fuel, occupies most important status in China's energy resource structure always.In recent years, along with China's rapid development of economy, especially coal consumption amount of energy-output ratio increases year by year, as the discharge capacity of the flyash of solid waste of fuel coal, also increases year by year.At present, flyash has become the maximum Single Pollution source of Chinese industrial solid waste, and flyash is serious to the harm of environment and human body, is mainly reflected in the aspects such as air pollution, water pollution, soil pollution, human health damage, geological disaster.Therefore, the contaminated environment of flyash control, process and utilize imperative.Through exploring for many years and research, researcher has been developed from flyash the resource higher value application technologies such as separation and Extraction aluminium oxide, silica, gallium, germanium, carbon granule, magnetic bead both at home and abroad.
But, at Ash Utilization, utilize in process, especially flyash low-concentration alkali liquor extracts silica, flyash high-concentration alkali liquor is extracted in the processes such as aluminium oxide, the strainability of flyash slip is poor, have a strong impact on process units and normally move, become Ash Utilization and utilize one of difficult problem urgently to be resolved hurrily.
At present, the method for raising strainability has had many research.
As CN102489244A discloses a kind of filter aid and using method thereof of aluminum filtration acid salt solution.Relate to a kind of flyash and powdered coal cinder of using as the method for filter aid aluminum filtration acid salt solution.It is characterized in that this filter aid is flyash and the powdered coal cinder of steam power plant.Utilize the different grain size of flyash and powdered coal cinder and the characteristic of porous thereof, the solid impurity particulate floating on a liquid is there is to the effect of adsorbing and holding back, thereby reach the object of liquid-solid separation.Use flyash and powdered coal cinder to filter in journey and neither can cause the loss of aluminium element at leaf as filter aid, also can not introduce other impurity element, can keep to greatest extent the chemical composition of original solution to stablize constant, be easy to apply industrial.In aluminate solution filter process, adopt flyash and powdered coal cinder as filter aid, obtained positive effect.
CN103157437A discloses a kind of filter aid, comprises flyash or slag, flyash or slag described in pretreatment, and described pretreatment comprises: described flyash or slag are carried out to pickling or alkali cleaning, control soda acid mass percent concentration 0.1%～0.8% simultaneously; Or interpolation lime, control described liming amount is 0.1%～0.5% of described flyash or slag weight simultaneously; Or add salt or alkali, the addition of described salt or alkali is 0.05～1% of described flyash or slag quality; Or interpolation salt, the addition of described salt is 1%～10% of described flyash or slag quality, under air-proof condition, will add the flyash of described salt or slag in 90～200 ℃ of boiling 1～5h, wherein, described salt heating can produce gas.
But the research that how to improve the strainability of flyash does not also have.
Summary of the invention
The object of the present invention is to provide a kind of method that improves alkaline powder coal ash slurry filtration performance.In alkaline powder coal ash slip, add filter aid, flocculant or surfactant, or mixture of more than two kinds, to improve the strainability of slip, realize effective separation of flyash slip.Filter aid or flocculant kind that the present invention uses are many, be easy to get, and easily degraded (or decomposition); And can not cause the loss of flyash stripping/leaching element (aluminium, silicon etc.), can not introduce other impurity elements yet, can preserve to greatest extent the chemical composition of original slip and stablize constant, easy to use, effective, reliable and stable, can regenerate, can realize industrial application.
In order to achieve the above object, the present invention adopts following technical scheme:
Improve a method for alkaline powder coal ash slurry filtration performance, in alkaline powder coal ash slip, add filter aid, flocculant or surfactant, or mixture of more than two kinds.; can only add filter aid or only add flocculant or only add surfactant to reach the effect that improves strainability; also can add filter aid and flocculant simultaneously; or filter aid and surfactant; or flocculant and surfactant, or filter aid, flocculant and surfactant reach the effect that improves strainability.In alkaline powder coal ash slip, add filter aid, flocculant or surfactant, or two or more mixtures can shorten filtration time greatly, improve greatly the filter efficiency of flyash slip.
As optimal technical scheme, method of the present invention, described alkaline powder coal ash slip is that flyash low-concentration alkali liquor extracts silica or flyash high-concentration alkali liquor is extracted the slip producing in alumina process.
As optimal technical scheme, method of the present invention, described filter aid is the one kind or two or more mixture in lime, lime-ash, kaolin, diatomite, white carbon, active carbon, perlite, gypsum, carclazyte, sawdust, cellulose.
As optimal technical scheme, method of the present invention, described flocculant is the one kind or two or more mixture in aluminium polychloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, PAFC, polyacrylamide, Sodium Polyacrylate, biological flocculant, calcium chloride.
As optimal technical scheme, method of the present invention, described surfactant is the one kind or two or more mixture in lauryl sodium sulfate, betaine, benzalkonium chloride, benzalkonium bromide, polyethylene glycol, tween.
As optimal technical scheme, method of the present invention, described filter aid is mixed with 0.1wt%～10wt% in advance, such as the suspension that is 0.5wt%, 1.2wt%, 1.8wt%, 2.3wt%, 3.0wt%, 5.0wt%, 7.0wt%, 9.0wt%, 9.5wt% etc., filter, on filter medium, form precoated shet, and then filter alkaline powder coal ash slip.The effect of this kind of filter method is particularly evident, and it is very remarkable that filtration time shortens.
As optimal technical scheme, method of the present invention, 0.1wt%～the 5wt% that adds filter cake butt in alkaline powder coal ash slip, such as the filter aid, flocculant or the surfactant that are 0.5wt%, 1.2wt%, 1.8wt%, 2.3wt%, 3.0wt%, 3.5wt%, 4.3wt%, 4.9wt% etc., or mixture of more than two kinds, after mixing, carry out flyash slurry filtration.
Mix or precoating is to add two kinds of main methods of operating of filter aid, wherein, be mixed with and help filter aid, flocculant or surfactant and be dispersed in slip with slip, contribute to filter, but addition is on the high side; Precoating contributes to form end cake layer, strengthen and filter, and filter aid consumption is less.
Preferably, described flocculant or surfactant be first at 40～60 ℃, under being 43 ℃, 47 ℃, 50 ℃, 54 ℃, 58 ℃ etc., is configured to 0.5～3gL
-1, for example, be 0.8gL
-1, 1.1gL
-1, 1.5gL
-1, 1.9gL
-1, 2.3gL
-1, 2.6gL
-1, 2.9gL
-1deng the aqueous solution.
As optimal technical scheme, method of the present invention, when add for filter aid and flocculant or filter aid and surfactant time, first filter aid and alkaline powder coal ash slip are mixed, and then add flocculant or surfactant to filter; Preferably, before filter aid and the mixing of alkaline powder coal ash slip, first use filter aid on filter medium, to form precoated shet.First form precoated shet, and then add flocculant or surfactant to filter, both can strengthen strainability, also can reduce the consumption of flocculant or surfactant simultaneously.
As optimal technical scheme, method of the present invention, 0.1wt%～the 5wt% that adds filter cake butt in alkaline powder coal ash slip, lime-ash such as being 0.5wt%, 1.2wt%, 1.8wt%, 2.3wt%, 3.0wt%, 3.5wt%, 4.3wt%, 4.9wt% etc., carries out flyash slurry filtration after mixing.
Filter cake butt in the present invention refers to anhydrous material, refers to that filtration cakes torrefaction after alkaline powder coal ash slurry filtration is to constant weight in the present invention, and the moisture of deducting in wet stock is benchmark.
The filter aid that the inventive method adopts or auxiliary agent kind are many, be easy to get, easily degraded (or decomposition), and can not cause the loss of flyash stripping/leaching element (aluminium, silicon etc.), can not introduce other impurity elements yet, can preserve to greatest extent the chemical composition of original slip stablizes constant, easy to use, effective, reliable and stable, can realize industrial application, greatly shorten the filtration time of flyash, filtration time can foreshorten to while not adding any auxiliary agent 12%～27% of the acid flyash slurry filtration time.
Accompanying drawing explanation
Fig. 1 is the process chart of embodiments of the invention 1 and 2;
Fig. 2 is the process chart of embodiments of the invention 3;
Fig. 3 is for first forming precoated shet, then with the process chart of flocculant and/or surfactant hybrid filtering;
Fig. 4 is the process chart of embodiments of the invention 4.
The specific embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment helps to understand the present invention, should not be considered as concrete restriction of the present invention.
As no specific instructions, various raw material of the present invention all can obtain by commercially available; Or prepare according to the conventional method of this area.Unless otherwise defined or described herein, the familiar meaning of all specialties used herein and scientific words and those skilled in the art is identical.In addition any method similar or impartial to described content and material all can be applicable in the inventive method.
The experimental technique of unreceipted actual conditions in the following example, measures according to national standard conventionally.If there is no corresponding national standard, according to general international standard, normal condition or the condition of advising according to manufacturer, carry out.Unless otherwise indicated, otherwise all umbers are weight portion, and all percentages are weight percentage.
Embodiment 1
The slip that flyash 15% NaOH of take extracts silica is example, and (chemical composition is SiO to diatomite
2=80%～94%, Al
2o
3=3%～6%, Fe
2o
3=1%～3%, CaO=1%～3%, MgO=0.5%～1.5%) be filter aid, prepare in advance 300mL1% lime-ash suspension, filter, on filter medium, form precoated shet; Pipette 10mL diatomite suspension, mix with 300mL flyash slip, at rotating speed 300rmin
-1lower stirring 5min, at filter medium, be polyamide fibre (nylon 66, Fypro, PA) alkaline-resisting filter cloth, to be of a size of Φ 100mm, vacuum be that 0.07MPa, temperature are to filter under the condition of 80～90 ℃, effectively filtration time foreshortens to 55s by the 3min56s that does not add filter aid, the moisture content of filter cake 38.3% is reduced to 32.5% by what do not add filter aid, and the chemical composition of filtrate is stablized constant.
Embodiment 2
The slip that flyash 50% NaOH of take extracts aluminium oxide is example, and (Boiler Cinder Surveying, chemical composition is SiO to lime-ash
2=30%～45%, Al
2o
3=30%～45%, Fe
2o
3=2%～5%, TiO
2=2%～5%, CaO=2%～5%, MgO=1%～3%, possible trouble carbon C=2%～10%) be filter aid, prepare in advance 300mL1% lime-ash suspension, filter, on filter medium, form precoated shet, pipette 10mL lime-ash suspension, mix with 300mL flyash slip, at filter medium, be polyamide fibre (nylon 66, Fypro, PA) alkaline-resisting filter cloth, be of a size of Φ 100mm, vacuum is 0.07MPa, temperature is to filter under the condition of 180～220 ℃, effectively filtration time foreshortens to 1min28s by the 7min12s that does not add filter aid, the moisture content of filter cake 41.7% is reduced to 35.8% by what do not add filter aid, the chemical composition of filtrate is substantially constant.
Embodiment 3
The slip that flyash 50% NaOH of take extracts aluminium oxide is example, and polyacrylamide (commercially available, cation, molecular weight approximately 5,000,000) be auxiliary agent, prepare in advance 100mL0.1% polyacrylamide solution, pipette 5.0mL, mix with 300mL flyash slip, at rotating speed 300rmin
-1lower stirring 20s, at filter medium, be polyamide fibre (nylon 66, Fypro, PA) alkaline-resisting filter cloth, to be of a size of Φ 100mm, vacuum be that 0.07MPa, temperature are to filter under the condition of 180～220 ℃, effectively filtration time foreshortens to 1min57s by the 7min12s that does not add auxiliary agent, the moisture content of filter cake 41.7% is reduced to 36.9% by what do not add auxiliary agent, and the chemical composition of filtrate is stablized constant.
Embodiment 4
The slip that flyash 50% sulfuric acid of take extracts aluminium oxide is example, and (Boiler Cinder Surveying, chemical composition is SiO to lime-ash
2=30%～45%, Al
2o3=30%～45%, Fe
2o3=2%～5%, TiO
2=2%～5%, CaO=2%～5%, MgO=1%～3%, possible trouble carbon C=2%～10%) be filter aid, prepare in advance 300mL1% lime-ash suspension, filter, on filter medium, form precoated shet; Polyacrylamide (commercially available, cation, molecular weight approximately 5,000,000) is flocculant, prepares in advance 100mL0.1% polyacrylamide solution; First pipette 10mL lime-ash suspension, mix with 300mL flyash slip, at rotating speed 300rmin
-1lower stirring 2min; Pipette again 5.0mL polyacrylamide solution, mix with flyash slip, at rotating speed 300rmin
-1lower stirring 20s, at filter medium, be polyamide fibre (nylon 66, Fypro, PA) alkaline-resisting filter cloth, to be of a size of Φ 100mm, vacuum be that 0.07MPa, temperature are to filter under the condition of 180～220 ℃, effectively filtration time foreshortens to 56s by the 7min12s that does not add auxiliary agent, the moisture content of filter cake 41.7% is reduced to 34.3% by what do not add auxiliary agent, and the chemical composition of filtrate is stablized constant.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to the selection of the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (10)
1. a method that improves alkaline powder coal ash slurry filtration performance, is characterized in that, in alkaline powder coal ash slip, adds filter aid, flocculant or surfactant, or mixture of more than two kinds.
2. method according to claim 1, is characterized in that, described alkaline powder coal ash slip is that flyash low-concentration alkali liquor extracts silica or flyash high-concentration alkali liquor is extracted the slip producing in alumina process.
3. method according to claim 1, is characterized in that, described filter aid is the one kind or two or more mixture in lime, lime-ash, kaolin, diatomite, white carbon, active carbon, perlite, gypsum, carclazyte, sawdust, cellulose.
4. method according to claim 1, it is characterized in that, described flocculant is the one kind or two or more mixture in aluminium polychloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate, PAFC, polyacrylamide, Sodium Polyacrylate, biological flocculant, calcium chloride.
5. method according to claim 1, is characterized in that, described surfactant is the one kind or two or more mixture in lauryl sodium sulfate, betaine, benzalkonium chloride, benzalkonium bromide, polyethylene glycol, tween.
6. according to the method described in claim 1-5 any one, it is characterized in that, described filter aid is mixed with 0.1wt%～10wt% suspension in advance, filters, and forms precoated shet on filter medium, and then filters alkaline powder coal ash slip.
7. according to the method described in claim 1-5 any one, it is characterized in that, the filter aid, flocculant or the surfactant that in alkaline powder coal ash slip, add the 0.1wt%～5wt% of filter cake butt, or mixture of more than two kinds, carry out flyash slurry filtration after mixing.
8. method according to claim 7, is characterized in that, described flocculant or surfactant are first configured to 0.5～3gL at 40～60 ℃
-1the aqueous solution.
9. method according to claim 7, is characterized in that, when add for filter aid and flocculant or filter aid and surfactant time, first filter aid and alkaline powder coal ash slip are mixed, and then add flocculant or surfactant to filter; Preferably, before filter aid and the mixing of alkaline powder coal ash slip, first use filter aid on filter medium, to form precoated shet.
10. according to the method described in claim 1-9 any one, it is characterized in that, in alkaline powder coal ash slip, add the lime-ash of the 0.1wt%～5wt% of filter cake butt, after mixing, carry out flyash slurry filtration.
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| CN201310616913.1A CN103638745B (en) | 2013-11-27 | 2013-11-27 | A kind of method improving alkaline coal ash slurry filtration performance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997795A (en) * | 2018-07-10 | 2018-12-14 | 丰城黑豹炭黑有限公司 | A kind of carbon black materials and preparation process |
| CN109999563A (en) * | 2019-04-03 | 2019-07-12 | 中国矿业大学 | A kind of coal slime filter-pressing method |
| CN113041713A (en) * | 2021-03-11 | 2021-06-29 | 太原理工大学 | Method for dewatering coal slime through metal oxide nano-particle assisted filtration |
-
2013
- 2013-11-27 CN CN201310616913.1A patent/CN103638745B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997795A (en) * | 2018-07-10 | 2018-12-14 | 丰城黑豹炭黑有限公司 | A kind of carbon black materials and preparation process |
| CN109999563A (en) * | 2019-04-03 | 2019-07-12 | 中国矿业大学 | A kind of coal slime filter-pressing method |
| CN113041713A (en) * | 2021-03-11 | 2021-06-29 | 太原理工大学 | Method for dewatering coal slime through metal oxide nano-particle assisted filtration |
| CN113041713B (en) * | 2021-03-11 | 2022-11-15 | 太原理工大学 | Method for dewatering coal slime through metal oxide nano-particle assisted filtration |
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| CN103638745B (en) | 2016-02-24 |
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