CN104477928A - Method for extracting sodium silicate from coal ashes - Google Patents
Method for extracting sodium silicate from coal ashes Download PDFInfo
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- CN104477928A CN104477928A CN201410728467.8A CN201410728467A CN104477928A CN 104477928 A CN104477928 A CN 104477928A CN 201410728467 A CN201410728467 A CN 201410728467A CN 104477928 A CN104477928 A CN 104477928A
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- sodium silicate
- described step
- flyash
- water
- coal ash
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Abstract
The invention relates to the technical field of sodium silicate preparation, and particularly relates to a method for extracting sodium silicate from coal ashes. The method for extracting sodium silicate from coal ashes provided by the invention comprises the following steps: grinding to obtain coal ash powder; putting the coal ashes and water into a reaction kettle according to the ratio, so as to obtain evenly mixed coal ash slurry; preparing an alkaline reaction liquid of ammonium bicarbonate, sodium hydroxide and water; adding the obtained alkaline reaction liquid to the coal ash slurry in the reaction kettle, so as to obtain a mixed reactant; carrying out airtight heating and pressurizing on the reaction kettle with the mixed reactant, opening the reaction kettle, and blowing off, so as to obtain a sodium silicate mixture; filtering the obtained sodium silicate mixture by virtue of a plate and frame filter, so as to obtain a filtered material; washing the filtered material with water for at least 50 minutes per 500kg of the filtered material, so as to obtain a sodium silicate dilute solution; and drying the sodium silicate dilute solution in hot air at 400 DEG C for at least two hours, so as to obtain a high-purity sodium silicate solution.
Description
Technical field
The present invention relates to water glass extractive technique field, be specifically related to a kind of method extracting water glass from flyash.
Background technology
In prior art, flyash is the fine particle dispersed resistates after pulverized coal friring, and total heap burden of Coal Ash in China has exceeded several hundred million ton, and just with the speed increment of annual hundred million tons.The continuous generation of a large amount of solid waste brings huge pressure to the normal operation of coal enterprise and ecotope, also can produce material impact to carrying out and implementing of National Sustainable Development Strategies simultaneously.Therefore, comprehensive effectively utilization of R and D flyash has important economy and social effect to the utilization of resources and environment protection.
The main chemical compositions of flyash is Al
2o
3and SiO
2, Al
2o
3account for 15 ~ 45%, SiO of flyash
2general more than 40%.The alumina silica ratio how improving flyash under the process environments, lower production cost of gentleness is the key point that Ash Utilization utilizes technology.Traditional technology for fine coal Chemical Composition Characteristics, by the Al in strong acid or highly basic extract powder coal ash
2o
3or SiO
2, technique, by the restriction of chemical composition of PCA, cannot be promoted, simultaneously seriously polluted.Method high density NaOH corrosion conventional in prior art is strong, require higher to equipment and operator, normal temperature and pressure reaction system desiliconization rate is low, and the sodium silicate solution metal ion content of preparation is higher, removal of impurities operation adds production cost, the flyash of desiliconization simultaneously preparation CaO and CaCO
3time solid material homogeneity cannot meet, the high waste not only increasing dealkalize cost but also cause caustic alkali of the alkalinity of desiliconization ash.
Summary of the invention
In order to overcome defect of the prior art, the invention provides a kind of technique simply extracts water glass method from flyash.
The present invention is achieved through the following technical solutions: a kind of method extracting water glass from flyash, and described method comprises:
Step one: ground by powdered coal ash, is ground to grain thickness degree in 100 to 200 order scopes, obtains flyash powder;
Step 2: according to the ratio of mass ratio 1:2, the flyash powder obtained in described step one and water are put into reactor, carry out mix and blend, obtain the coal ash pulp mixed;
Step 3: according to the proportions ammonium hydrogencarbonate of mass percent 3%:7%:90%, sodium hydroxide and water, mix, obtain alkali reaction liquid;
Step 4: the alkali reaction liquid obtained in described step 3 and coal ash pulp to be added in described step 2 in reactor according to the ratio of mass ratio 1:9, obtains mixed reactant;
Step 5: the reactor that mixed reactant is housed in described step 4 is carried out airtight temperature-pressure, the temperature range of heating is 160 DEG C to 190 DEG C, the pressure range of pressurization is 8 kPas to 10 kPas, and the reaction times, for opening reactor venting after at least 1 hour, obtains sodium silicate mixture;
Step 6: filtered by the sodium silicate mixture flame filter press obtained in described step 5, obtain filtrate, rinses described filtrate water, at least rinses and rinses for 50 minutes, obtain sodium silicate solution according to every 500 kilograms;
Step 7: dried under 400 DEG C of warm airs by the sodium silicate solution in described step 6, drying time is at least dried according to every 500 kilograms and is dried for 2 hours, obtains high purity silicon acid sodium solution.
Further, the heating temperature range in described step 5 is 165 DEG C to 185 DEG C.
Further, in described step 5, Heating temperature is 180 DEG C.
Further, the filtration carried out in described step 6 is that use 100 object flame filter press filters.
Further, the filtration carried out in described step 6 is that use 200 object flame filter press filters.
Compared with prior art, superior effect is the method extracting water glass from flyash of the present invention: the present invention can extract water glass efficiently from flyash.The waste liquid produced in present invention process process, waste gas etc. all can utilize by Efficient Cycle, discharge low waste liquid, waste gas and waste residue.Present invention process is simple, reaction temperature and, invest little.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet extracting the method for water glass from flyash of the present invention.
Reference numeral is as follows:
In figure, the direction of arrow is method technical process direction of extracting water glass from flyash of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
As shown in Figure 1, illustrate the present invention, provide a kind of method extracting water glass from flyash, described method comprises:
Step one: ground by powdered coal ash, is ground to grain thickness degree in 100 to 200 order scopes, obtains flyash powder;
Step 2: according to the ratio of mass ratio 1:2, the flyash powder obtained in described step one and water are put into reactor, carry out mix and blend, obtain the coal ash pulp mixed;
Step 3: according to the proportions ammonium hydrogencarbonate of mass percent 3%:7%:90%, sodium hydroxide and water, mix, obtain alkali reaction liquid;
Step 4: the alkali reaction liquid obtained in described step 3 and coal ash pulp to be added in described step 2 in reactor according to the ratio of mass ratio 1:9, obtains mixed reactant;
Step 5: the reactor that mixed reactant is housed in described step 4 is carried out airtight temperature-pressure, the temperature range of heating is 160 DEG C to 190 DEG C, the pressure range of pressurization is 8 kPas to 10 kPas, and the reaction times, for opening reactor venting after at least 1 hour, obtains sodium silicate mixture;
Step 6: filtered by the sodium silicate mixture flame filter press obtained in described step 5, obtain filtrate, rinses described filtrate water, at least rinses and rinses for 50 minutes, obtain sodium silicate solution according to every 500 kilograms;
Step 7: dried under 400 DEG C of warm airs by the sodium silicate solution in described step 6, drying time is at least dried according to every 500 kilograms and is dried for 2 hours, obtains high purity silicon acid sodium solution.Heating temperature range in preferred described step 5 is 165 DEG C to 185 DEG C, and in described step 5, Heating temperature is 180 DEG C, and the filtration carried out in preferred described step 6 is that use 100 object flame filter press filters.
The present invention is not limited to above-mentioned embodiment, and when not deviating from flesh and blood of the present invention, any distortion that it may occur to persons skilled in the art that, improvement, replacement all fall into scope of the present invention.
Claims (5)
1. from flyash, extract a method for water glass, it is characterized in that, described method comprises:
Step one: ground by powdered coal ash, is ground to grain thickness degree in 100 to 200 order scopes, obtains flyash powder;
Step 2: according to the ratio of mass ratio 1:2, the flyash powder obtained in described step one and water are put into reactor, carry out mix and blend, obtain the coal ash pulp mixed;
Step 3: according to the proportions ammonium hydrogencarbonate of mass percent 3%:7%:90%, sodium hydroxide and water, mix, obtain alkali reaction liquid;
Step 4: the alkali reaction liquid obtained in described step 3 and coal ash pulp to be added in described step 2 in reactor according to the ratio of mass ratio 1:9, obtains mixed reactant;
Step 5: the reactor that mixed reactant is housed in described step 4 is carried out airtight temperature-pressure, the temperature range of heating is 160 DEG C to 190 DEG C, the pressure range of pressurization is 8 kPas to 10 kPas, and the reaction times, for opening reactor venting after at least 1 hour, obtains sodium silicate mixture;
Step 6: filtered by the sodium silicate mixture flame filter press obtained in described step 5, obtain filtrate, rinses described filtrate water, at least rinses and rinses for 50 minutes, obtain sodium silicate solution according to every 500 kilograms;
Step 7: dried under 400 DEG C of warm airs by the sodium silicate solution in described step 6, drying time is at least dried according to every 500 kilograms and is dried for 2 hours, obtains high purity silicon acid sodium solution.
2. in flyash, extract the method for water glass according to claim 1, it is characterized in that, the heating temperature range in described step 5 is 165 DEG C to 185 DEG C.
3. in flyash, extract the method for water glass according to claim 2, it is characterized in that, in described step 5, Heating temperature is 180 DEG C.
4. in flyash, extract the method for water glass according to claim 1, it is characterized in that, the filtration carried out in described step 6 is that use 100 object flame filter press filters.
5. in flyash, extract the method for water glass according to claim 1, it is characterized in that, the filtration carried out in described step 6 is that use 200 object flame filter press filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410728467.8A CN104477928B (en) | 2014-12-03 | 2014-12-03 | Method for extracting sodium silicate from coal ashes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410728467.8A CN104477928B (en) | 2014-12-03 | 2014-12-03 | Method for extracting sodium silicate from coal ashes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104477928A true CN104477928A (en) | 2015-04-01 |
| CN104477928B CN104477928B (en) | 2017-01-11 |
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| CN201410728467.8A Active CN104477928B (en) | 2014-12-03 | 2014-12-03 | Method for extracting sodium silicate from coal ashes |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1868884A (en) * | 2006-06-02 | 2006-11-29 | 李禹� | Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black |
| CN101993085A (en) * | 2010-11-29 | 2011-03-30 | 中煤平朔煤业有限责任公司 | Method for producing white carbon black for toothpaste from fly ash |
| CN101993087A (en) * | 2010-11-29 | 2011-03-30 | 中煤平朔煤业有限责任公司 | Method for preparing water glass by using fly ash |
| CN102602969A (en) * | 2012-04-23 | 2012-07-25 | 长安大学 | Method for extracting aluminum oxide from fluidized bed coal ash |
| CN102936016A (en) * | 2012-11-12 | 2013-02-20 | 山西大学 | Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue |
-
2014
- 2014-12-03 CN CN201410728467.8A patent/CN104477928B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1868884A (en) * | 2006-06-02 | 2006-11-29 | 李禹� | Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black |
| CN101993085A (en) * | 2010-11-29 | 2011-03-30 | 中煤平朔煤业有限责任公司 | Method for producing white carbon black for toothpaste from fly ash |
| CN101993087A (en) * | 2010-11-29 | 2011-03-30 | 中煤平朔煤业有限责任公司 | Method for preparing water glass by using fly ash |
| CN102602969A (en) * | 2012-04-23 | 2012-07-25 | 长安大学 | Method for extracting aluminum oxide from fluidized bed coal ash |
| CN102936016A (en) * | 2012-11-12 | 2013-02-20 | 山西大学 | Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue |
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|---|---|
| CN104477928B (en) | 2017-01-11 |
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