CN103638745B - A kind of method improving alkaline coal ash slurry filtration performance - Google Patents
A kind of method improving alkaline coal ash slurry filtration performance Download PDFInfo
- Publication number
- CN103638745B CN103638745B CN201310616913.1A CN201310616913A CN103638745B CN 103638745 B CN103638745 B CN 103638745B CN 201310616913 A CN201310616913 A CN 201310616913A CN 103638745 B CN103638745 B CN 103638745B
- Authority
- CN
- China
- Prior art keywords
- slip
- coal ash
- filter aid
- flyash
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The present invention relates to a kind of method improving alkaline coal ash slurry filtration performance.Described method, in alkaline coal ash slurry filtration process, adopts and add filter aid, flocculant or surfactant, or mixture of more than two kinds is to improve the strainability of slip, realizes effective separation of flyash slip.The filter aid that the inventive method adopts or auxiliary agent kind many, be easy to get, easy degraded (or decomposition), and the loss of flyash stripping/leaching element (aluminium, silicon etc.) can not be caused, also can not introduce other impurity elements, the chemical composition preserving original slip is to greatest extent stablized constant, easy to use, effective, reliable and stable, can industrial application be 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 extracts the fields such as aluminium oxide, is specifically related to a kind of method improving alkaline 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, energy-output ratio especially coal consumption amount increases year by year, and the discharge capacity as 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 the harm of flyash to environment and human body is serious, is mainly reflected in the aspects such as air pollution, water pollutions, soil pollution, human health damage, geological disaster.Therefore, flyash contaminated environment control, treatment and utilization is imperative.Through Exploration & stu dy for many years, domestic and international researcher develops the resource higher value application technology such as separation and Extraction aluminium oxide, silica, gallium, germanium, carbon granule, magnetic bead from flyash.
But, utilize in process at Ash Utilization, especially flyash low-concentration alkali liquor extracts in the process such as silica, flyash high-concentration alkali liquor extraction aluminium oxide, the strainability of flyash slip is poor, have a strong impact on process units normally to run, become Ash Utilization and utilize one of difficult problem urgently to be resolved hurrily.
At present, the method improving 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 aluminate 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, to the effect that the solid impurity particulate floated on a liquid has absorption and retains, thus reach the object of solid-liquor separation.Use flyash and powdered coal cinder to filter the loss that both can not cause aluminium element in journey at leaf as filter aid, also can not introduce other impurity element, can the chemical composition of original solution be kept to greatest extent to stablize constant, be easy to industrially apply.Adopt flyash and powdered coal cinder as filter aid in aluminate solution filter process, achieve positive effect.
CN103157437A discloses a kind of filter aid, comprises flyash or slag, flyash described in pretreatment or slag, and described pretreatment comprises: described flyash or slag are carried out pickling or alkali cleaning, controls soda acid mass percent concentration 0.1% ~ 0.8% simultaneously; Or interpolation lime, control that described lime-crushed stone pile is described flyash or slag weight 0.1% ~ 0.5% 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, and will with the addition of the flyash of described salt or slag in 90 ~ 200 DEG C of boiling 1 ~ 5h under air-proof condition, wherein, described salt heating can produce gas.
But the research how improving 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 improving alkaline coal ash slurry filtration performance.Filter aid, flocculant or surfactant is added in alkaline coal ash slip, or mixture of more than two kinds, to improve the strainability of slip, realize effective separation of flyash slip.Filter aid or the flocculant kind of the present invention's use are many, are easy to get, easily degraded (or decomposition); And the loss of flyash stripping/leaching element (aluminium, silicon etc.) can not be caused, also can not introduce other impurity elements, the chemical composition preserving original slip is to greatest extent stablized constant, easy to use, effective, reliable and stable, can regenerate, can industrial application be realized.
In order to achieve the above object, the present invention adopts following technical scheme:
Improve a method for alkaline coal ash slurry filtration performance, in alkaline coal ash slip, add filter aid, flocculant or surfactant, or mixture of more than two kinds.Namely, only can add filter aid or only add flocculant or only add surfactant and reach the effect improving 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 improving strainability.Add filter aid, flocculant or surfactant in alkaline coal ash slip, or two or more mixtures can shorten filtration time greatly, greatly improve the filter efficiency of flyash slip.
As optimal technical scheme, method of the present invention, described alkaline coal ash slip is that flyash low-concentration alkali liquor extracts silica or flyash high-concentration alkali liquor extracts the slip produced 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, be such as the suspension of 0.5wt%, 1.2wt%, 1.8wt%, 2.3wt%, 3.0wt%, 5.0wt%, 7.0wt%, 9.0wt%, 9.5wt% etc., filter, filter medium forms precoated shet, and then filters alkaline 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% of filter cake butt is added in alkaline coal ash slip, be such as the filter aid of 0.5wt%, 1.2wt%, 1.8wt%, 2.3wt%, 3.0wt%, 3.5wt%, 4.3wt%, 4.9wt% etc., flocculant or surfactant, or mixture of more than two kinds, carry out flyash slurry filtration after mixing.
The main method of operating of filter aid two kinds is added in mixing or precoating, wherein, is mixed with and helps filter aid, flocculant or surfactant and be dispersed in slip, contribute to filtering, but addition is on the high side with slip; Precoating contributes to forming end cake layer, strengthen and filter, and filter aid consumption is less.
Preferably, described flocculant or surfactant first at 40 ~ 60 DEG C, such as, are be configured to 0.5 ~ 3gL under 43 DEG C, 47 DEG C, 50 DEG C, 54 DEG C, 58 DEG C etc.
-1, such as, 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 by filter aid and the mixing of alkaline coal ash slip, and then add flocculant or surfactant filters; Preferably before filter aid and the mixing of alkaline coal ash slip, filter aid is first used to form precoated shet on filter medium.First form precoated shet, and then add flocculant or surfactant filtration, both can strengthen strainability, and also can reduce the consumption of flocculant or surfactant simultaneously.
As optimal technical scheme, method of the present invention, 0.1wt% ~ the 5wt% of filter cake butt is added in alkaline coal ash slip, be such as the lime-ash of 0.5wt%, 1.2wt%, 1.8wt%, 2.3wt%, 3.0wt%, 3.5wt%, 4.3wt%, 4.9wt% etc., after mixing, carry out flyash slurry filtration.
Filter cake butt in the present invention refers to anhydrous material, refers to that the filtration cakes torrefaction after alkaline coal ash slurry filtration is to constant weight in the present invention, and namely the moisture deducted in wet stock is benchmark.
The filter aid that the inventive method adopts or auxiliary agent kind many, be easy to get, easy degraded (or decomposition), and the loss of flyash stripping/leaching element (aluminium, silicon etc.) can not be caused, also other impurity elements can not be introduced, the chemical composition preserving original slip is to greatest extent stablized constant, easy to use, effective, reliable and stable, can realize industrial application, substantially reduce the filtration time of flyash, filtration time can foreshorten to 12% ~ 27% of acid flyash slurry filtration time when not adding any auxiliary agent.
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 for first to form 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.
Detailed description of the invention
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 is only help 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 be obtained by commercially available; Or prepare according to the conventional method of this area.Unless otherwise defined or described herein, all specialties used herein and scientific words and those skilled in the art the meaning be familiar with 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 usually.If there is no corresponding national standard, then according to general international standard, normal condition or carry out according to the condition that manufacturer advises.Unless otherwise indicated, otherwise all numbers are weight portion, and all percentage is weight percentage.
Embodiment 1
Extract the slip of silica for flyash 15% NaOH, (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 300mL1% lime-ash suspension in advance, filter, filter medium forms precoated shet; Pipette 10mL diatomite suspension, mix with 300mL flyash slip, at rotating speed 300rmin
-1lower stirring 5min, be polyamide fibre (nylon66 fiber at filter medium, Fypro, PA) alkaline-resisting filter cloth, be of a size of Φ 100mm, vacuum is 0.07MPa, temperature is filter under the condition of 80 ~ 90 DEG C, effective filtration time foreshortens to 55s by the 3min56s not adding filter aid, the moisture content of filter cake is reduced to 32.5% by do not add filter aid 38.3%, and the chemical composition of filtrate is stablized constant.
Embodiment 2
Extract the slip of aluminium oxide for flyash 50% NaOH, (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 300mL1% lime-ash suspension in advance, filter, filter medium forms precoated shet, pipette 10mL lime-ash suspension, mix with 300mL flyash slip, be polyamide fibre (nylon66 fiber at filter medium, Fypro, PA) alkaline-resisting filter cloth, be of a size of Φ 100mm, vacuum is 0.07MPa, temperature is filter under the condition of 180 ~ 220 DEG C, effective filtration time foreshortens to 1min28s by the 7min12s not adding filter aid, the moisture content of filter cake is reduced to 35.8% by do not add filter aid 41.7%, the chemical composition of filtrate is substantially constant.
Embodiment 3
The slip of aluminium oxide is extracted for flyash 50% NaOH, and polyacrylamide (commercially available, cation, molecular weight about 5,000,000) be auxiliary agent, prepare 100mL0.1% polyacrylamide solution in advance, pipette 5.0mL, mix with 300mL flyash slip, at rotating speed 300rmin
-1lower stirring 20s, be polyamide fibre (nylon66 fiber at filter medium, Fypro, PA) alkaline-resisting filter cloth, be of a size of Φ 100mm, vacuum is 0.07MPa, temperature is filter under the condition of 180 ~ 220 DEG C, effective filtration time foreshortens to 1min57s by the 7min12s not adding auxiliary agent, the moisture content of filter cake is reduced to 36.9% by do not add auxiliary agent 41.7%, and the chemical composition of filtrate is stablized constant.
Embodiment 4
Extract the slip of aluminium oxide for flyash 50% sulfuric acid, (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 300mL1% lime-ash suspension in advance, filter, filter medium forms precoated shet; Polyacrylamide (commercially available, cation, molecular weight about 5,000,000) is flocculant, prepares 100mL0.1% polyacrylamide solution in advance; First pipette 10mL lime-ash suspension, mix with 300mL flyash slip, at rotating speed 300rmin
-1lower stirring 2min; Pipette 5.0mL polyacrylamide solution again, mix with flyash slip, at rotating speed 300rmin
-1lower stirring 20s, be polyamide fibre (nylon66 fiber at filter medium, Fypro, PA) alkaline-resisting filter cloth, be of a size of Φ 100mm, vacuum is 0.07MPa, temperature is filter under the condition of 180 ~ 220 DEG C, effective filtration time foreshortens to 56s by the 7min12s not adding auxiliary agent, the moisture content of filter cake is reduced to 34.3% by do not add auxiliary agent 41.7%, and the chemical composition of filtrate is stablized constant.
Applicant states, 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, namely 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 equivalence replacement and the interpolation of auxiliary element, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (10)
1. improve a method for alkaline coal ash slurry filtration performance, it is characterized in that, filter aid is mixed with 0.1wt% ~ 10wt% suspension in advance, filters, filter medium forms precoated shet, and then filters alkaline coal ash slip; Or
The filter aid of the 0.1wt% ~ 5wt% of filter cake butt, flocculant or surfactant is added in alkaline coal ash slip, or mixture of more than two kinds, carry out flyash slurry filtration after mixing.
2. method according to claim 1, is characterized in that, described alkaline coal ash slip is that flyash low-concentration alkali liquor extracts silica or flyash high-concentration alkali liquor extracts the slip produced 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. the method according to any one of claim 1-5, is characterized in that, described flocculant or surfactant are first configured to 0.5 ~ 3gL at 40 ~ 60 DEG C
-1the aqueous solution.
7. method according to claim 6, is characterized in that, when add for filter aid and flocculant or filter aid and surfactant time, first by filter aid and the mixing of alkaline coal ash slip, and then add flocculant or surfactant filters.
8. method according to claim 7, is characterized in that, before filter aid and the mixing of alkaline coal ash slip, first uses filter aid to form precoated shet on filter medium.
9. the method according to any one of claim 1-5, is characterized in that, adds the lime-ash of the 0.1wt% ~ 5wt% of filter cake butt in alkaline coal ash slip, carries out flyash slurry filtration after mixing.
10. method according to claim 6, is characterized in that, adds the lime-ash of the 0.1wt% ~ 5wt% of filter cake butt in alkaline coal ash slip, carries out flyash slurry filtration after mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616913.1A CN103638745B (en) | 2013-11-27 | 2013-11-27 | A kind of method improving alkaline coal ash slurry filtration performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616913.1A CN103638745B (en) | 2013-11-27 | 2013-11-27 | A kind of method improving alkaline coal ash slurry filtration performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103638745A CN103638745A (en) | 2014-03-19 |
| CN103638745B true CN103638745B (en) | 2016-02-24 |
Family
ID=50244113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310616913.1A Expired - Fee Related CN103638745B (en) | 2013-11-27 | 2013-11-27 | A kind of method improving alkaline coal ash slurry filtration performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103638745B (en) |
Families Citing this family (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 |
| 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 |
-
2013
- 2013-11-27 CN CN201310616913.1A patent/CN103638745B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN103638745A (en) | 2014-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103638744B (en) | A kind of method improving acid flyash slurry filtration performance | |
| CN104495899B (en) | A kind of carbide slag and flyash work in coordination with the method for recycling | |
| CN101797496B (en) | Preparation method of inorganic-organic compound-type adsorbent based on clinoptilolite and application for removing Cr(VI) in industrial waste water | |
| CN102190345B (en) | Method for enriching low-concentration heavy metal in water by recyclable magnesium hydroxide adsorbent | |
| CN102190309A (en) | Method for lowering pH value of active calcium silicate | |
| CN102020299B (en) | Method for producing industrial activated aluminum oxide from pulverized fuel ash | |
| CN102583410B (en) | Method for producing active calcium silicate by using fly ash desilication mother solution | |
| CN104445844A (en) | Method for dealkalizing red mud by uniting smoke and basic material | |
| CN108126652A (en) | Using flyash as the water treatment agent of primary raw material | |
| CN102091593A (en) | Preparation method of functionalized fly ash and zeolite composite particles | |
| CN103638745B (en) | A kind of method improving alkaline coal ash slurry filtration performance | |
| CN109095732A (en) | A kind of technique based on magnesium processes desulfurization wastewater high-purity magnesium hydroxide | |
| CN104001479B (en) | A kind of inorganic mineral water treatment agent and preparation method thereof | |
| CN104291539B (en) | One utilizes CO2method with spent acid Combined Treatment Bayer process red mud dealkalize | |
| CN102849764B (en) | Method for preparing pseudo-boehmite by pulverized fuel ash | |
| CN113398875A (en) | Preparation method and application of fly ash-based multifunctional adsorbent | |
| CN111116224B (en) | Desulfurizer using red mud waste residue as active raw material, and preparation method and application thereof | |
| CN104772214B (en) | A kind of method that fly ash highly removes ferrum | |
| CN108585005A (en) | A kind of dealkalization method of Bayer process red mud | |
| CN102020303B (en) | Method for producing ultra-high purity aluminium sulfate from fly ash | |
| CN107445498A (en) | A kind of preparation method of phosphogypsum powder coal ash composite gelled material | |
| CN103738972A (en) | Method for preparing silicon micropowder by using pulverized fuel ash aluminum extraction residues | |
| CN113289572A (en) | Method for preparing heavy metal ion adsorbent by using fly ash aluminum extraction slag | |
| CN104107676B (en) | A kind of cinder of burned coal discarded object that utilizes prepares the method for aluminium for tobermorite sorbing material | |
| CN102671623A (en) | Preparation method of fly ash based zeolite / alumina composite adsorbing material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160224 Termination date: 20161127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |