CN104477928B - Method for extracting sodium silicate from coal ashes - Google Patents
Method for extracting sodium silicate from coal ashes Download PDFInfo
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- CN104477928B CN104477928B CN201410728467.8A CN201410728467A CN104477928B CN 104477928 B CN104477928 B CN 104477928B CN 201410728467 A CN201410728467 A CN 201410728467A CN 104477928 B CN104477928 B CN 104477928B
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- sodium silicate
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- flyash
- 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 sodium silicate extractive technique field, be specifically related to a kind of method extracting sodium silicate from flyash.
Background technology
In prior art, flyash is the fine grained dispersed residue after pulverized coal friring, total heap burden of Coal Ash in China
Exceed several hundred million ton, and just with the speed increment of annual hundred million tons.Constantly producing to coal enterprise of a large amount of solid waste
Properly functioning and ecological environment brings huge pressure, carries out and implements National Sustainable Development Strategies simultaneously and also can produce
Material impact.Therefore, comprehensive effectively utilization of R and D flyash has important warp to the utilization of resources and environmental conservation
Ji and social meaning.
The main chemical compositions of flyash is Al2O3And SiO2, Al2O3Account for the 15～45% of flyash, SiO2Typically
More than 40%.The alumina silica ratio how improving flyash under gentle process environments, relatively low production cost is flyash money
Source utilizes the key point of technology.Traditional handicraft is for fine coal Chemical Composition Characteristics, by strong acid or highly basic extract powder coal ash
In Al2O3Or SiO2, technique is limited by chemical composition of PCA, it is impossible to promote, the most seriously polluted.Prior art
In conventional method high concentration NaOH corrosion strong, equipment and operator are required higher, normal temperature and pressure reaction system
Desiliconization rate is low, and the sodium silicate solution metal ion content of preparation is higher, and remove impurity operation adds production cost, simultaneously desiliconization fine coal
Ash preparation CaO and CaCO3Time solid material uniformity cannot meet, desiliconization ash alkalinity height not only increase dealkalize cost
And cause the waste of caustic alkali.
Summary of the invention
In order to overcome defect of the prior art, the present invention provides a kind of technique simply to extract the side of sodium silicate from flyash
Method.
The present invention is achieved through the following technical solutions: a kind of method extracting sodium silicate from flyash, described method bag
Include:
Step one: be ground by powdered coal ash, is ground to grain thickness degree in 100 to 200 mesh scopes, obtains fine coal
Ash powder；
Step 2: the flyash powder and the water that obtain in described step one are put into reactor according to the ratio of mass ratio 1:2,
Carry out mix and blend, the coal ash pulp being uniformly mixed；
Step 3: according to proportions ammonium hydrogencarbonate, sodium hydroxide and the water of mass percent 3%:7%:90%, mixing is all
Even, obtain alkaline reaction liquid；
Step 4: the alkaline reaction liquid obtained in described step 3 is added according to the ratio of mass ratio 1:9 with coal ash pulp
In described step 2 in reactor, obtain mixed reactant；
Step 5: reactor equipped with mixed reactant in described step 4 is carried out airtight temperature-pressure, the temperature model heated
Enclosing is 160 DEG C to 190 DEG C, and the pressure limit of pressurization is 8 kPas to 10 kPas, and the response time is to open after at least 1 hour
Reactor is exitted, and obtains sodium silicate mixture；
Step 6: the sodium silicate mixture flame filter press obtained in described step 5 is filtered, obtains filtrate,
Described filtrate water is rinsed, at least rinses according to every 500 kilograms and be rinsed for 50 minutes, obtain sodium silicate molten
Liquid；
Step 7: dried under 400 DEG C of hot-airs by the sodium silicate solution in described step 6, drying time is according to often
At least dry for 500 kilograms and dry for 2 hours, obtain 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-up temperature is 180 DEG C.
Further, the filtration carried out in described step 6 is that the flame filter press using 100 mesh filters.
Further, the filtration carried out in described step 6 is that the flame filter press using 200 mesh filters.
Of the present invention extracting the method for sodium silicate from flyash compared with prior art, superior effect is: the present invention can
To extract sodium silicate efficiently from flyash.During present invention process, the waste liquid of generation, waste gas etc. all can Efficient Cycle profits
With, discharge low waste liquid, waste gas and waste residue.Present invention process is simple, reaction gentleness, invests little.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method extracting sodium silicate from flyash of the present invention.
Reference is as follows:
In figure, the direction of arrow is the method technological process direction extracting sodium silicate from flyash of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described in further detail.
As it is shown in figure 1, illustrate the present invention, it is provided that a kind of method extracting sodium silicate from flyash, described method bag
Include:
Step one: be ground by powdered coal ash, is ground to grain thickness degree in 100 to 200 mesh scopes, obtains fine coal
Ash powder；
Step 2: the flyash powder and the water that obtain in described step one are put into reactor according to the ratio of mass ratio 1:2,
Carry out mix and blend, the coal ash pulp being uniformly mixed；
Step 3: according to proportions ammonium hydrogencarbonate, sodium hydroxide and the water of mass percent 3%:7%:90%, mixing is all
Even, obtain alkaline reaction liquid；
Step 4: the alkaline reaction liquid obtained in described step 3 is added according to the ratio of mass ratio 1:9 with coal ash pulp
In described step 2 in reactor, obtain mixed reactant；
Step 5: reactor equipped with mixed reactant in described step 4 is carried out airtight temperature-pressure, the temperature model heated
Enclosing is 160 DEG C to 190 DEG C, and the pressure limit of pressurization is 8 kPas to 10 kPas, and the response time is to open after at least 1 hour
Reactor is exitted, and obtains sodium silicate mixture；
Step 6: the sodium silicate mixture flame filter press obtained in described step 5 is filtered, obtains filtrate,
Described filtrate water is rinsed, at least rinses according to every 500 kilograms and be rinsed for 50 minutes, obtain sodium silicate molten
Liquid；
Step 7: the sodium silicate solution in described step 6 is dried under 400 DEG C of hot-airs, drying time according to
Every 500 kilograms of at least drying are dried for 2 hours, obtain high purity silicon acid sodium solution.Adding in the most described step 5
Hot temperature range is 165 DEG C to 185 DEG C, and in described step 5, heating-up temperature is 180 DEG C, carries out in the most described step 6
Filtration be use 100 mesh flame filter press filter.
The present invention is not limited to above-mentioned embodiment, in the case of without departing substantially from the flesh and blood of the present invention, people in the art
Member it is contemplated that any deformation, improve, replace and each fall within the scope of the present invention.
Claims (4)
1. the method extracting sodium silicate from flyash, it is characterised in that described method includes:
Step one: be ground by powdered coal ash, is ground to grain thickness degree in 100 to 200 mesh scopes, obtains fine coal
Ash powder；
Step 2: according to the ratio of mass ratio 1:2, the flyash powder and the water that obtain in described step one are put into reactor, enter
Row mix and blend, the coal ash pulp being uniformly mixed；
Step 3: according to proportions ammonium hydrogencarbonate, sodium hydroxide and the water of mass percent 3%:7%:90%, mixing is all
Even, obtain alkaline reaction liquid；
Step 4: the alkaline reaction liquid obtained in described step 3 is added to according to the ratio of mass ratio 1:9 with coal ash pulp
In described step 2 in reactor, obtain mixed reactant；
Step 5: reactor equipped with mixed reactant in described step 4 is carried out airtight temperature-pressure, the temperature model heated
Enclosing is 160 DEG C to 190 DEG C, and the pressure limit of pressurization is 8 kPas to 10 kPas, and the response time is to open after at least 1 hour
Reactor is exitted, and obtains sodium silicate mixture；
Step 6: the sodium silicate mixture obtained in the described step 5 flame filter press of 100 mesh is filtered, obtains
Filtrate, is rinsed described filtrate water, at least rinses according to every 500 kilograms and is rinsed for 50 minutes, obtains silicon
Acid sodium solution；
Step 7: dried under 400 DEG C of hot-airs by the sodium silicate solution in described step 6, drying time is according to often
At least dry for 500 kilograms and dry for 2 hours, obtain high purity silicon acid sodium solution.
A kind of method extracting sodium silicate from flyash, it is characterised in that described step 5
In heating temperature range be 165 DEG C to 185 DEG C.
A kind of method extracting sodium silicate from flyash, it is characterised in that described step 5
Middle heating-up temperature is 180 DEG C.
A kind of method extracting sodium silicate from flyash, it is characterised in that described step 6
In the filtration that carries out be that the flame filter press using 200 mesh 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 CN104477928A (en) | 2015-04-01 |
| CN104477928B true 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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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100457628C (en) * | 2006-06-02 | 2009-02-04 | 李禹� | Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black |
| 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 |
| CN101993085B (en) * | 2010-11-29 | 2012-10-03 | 中煤平朔煤业有限责任公司 | Method for producing white carbon black for toothpaste from fly ash |
| CN102602969B (en) * | 2012-04-23 | 2014-04-09 | 长安大学 | Method for extracting aluminum oxide from fluidized bed coal ash |
| CN102936016B (en) * | 2012-11-12 | 2014-06-18 | 山西大学 | Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue |
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2014
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