CN103553390A - Digestion method of free calcium oxide in fly ash and application thereof - Google Patents
Digestion method of free calcium oxide in fly ash and application thereof Download PDFInfo
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- CN103553390A CN103553390A CN201310490520.0A CN201310490520A CN103553390A CN 103553390 A CN103553390 A CN 103553390A CN 201310490520 A CN201310490520 A CN 201310490520A CN 103553390 A CN103553390 A CN 103553390A
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Abstract
The invention provides a digestion method of free calcium oxide in fly ash. The digestion method comprises the following steps of: (1) adding the fly ash to a ball mill and jetting water spray into the ball mill, wherein the weight ratio of the water spray jetted in to the free calcium oxide in fly ash is (1.5-2.0): 1; and (2) grinding the fly ash under the water spray condition, wherein the grinding time of the fly ash in the ball mill is controlled within 25 to 30 minutes. The digestion method is capable of increasing the dosage of the fly ash in cement or concrete by partially digesting free calcium oxide while increasing the specific surface area of fly ash and improving the activity of fly ash gel. The invention also provides fly ash prepared by the digestion method; the fly ash can be used for preparing cement. The invention also provides cement containing the fly ash.
Description
Technical field
The present invention relates to the treatment process of flyash, relate in particular to the digestion procedure of flyash free calcium oxide.
Background technology
Flyash refers to that modern large coal-fired boiler grinds coal dust to 100 μ m when fire coal, then coal dust and high velocity air mix, spray in hearth combustion band, the organic substance in pulverized coal particle is fully burned, the fine powder reclaiming from flue gas is flyash.The mixture that coal is comprised of many kinds of substance, wherein incombustible mineral substance is decomposed and separates out as ash after burning, becomes ash or slag, the mineral residue that it is comprised of oxide compounds such as silicon, aluminium, iron, calcium, magnesium after cooling.The chemical composition of flyash depends on coal-fired composition, and calcium oxide content is greater than 10% flyash and is called high-calcium fly ass.
The application method of existing flyash in building materials is to mix in cement or concrete it as active principle.When ordinary fly ash mixes in silicate cement or concrete, the calcium hydroxide that it can decompose out with cement aquation carries out " secondary reaction ", generates the CSH gelling with gelling ability.Be that ordinary fly ash does not have self-hardening property, ordinary fly ash need be used in conjunction with neat portland cement, limited as its add-on of activity latex material, and too much mixing can only be as inert fill material, and its incorporation in silicate cement or concrete is limited.
There is rich lime glass pearl and the more rich iron glass pearl of iron content that contains in a large number more calcium oxide in high-calcium fly ass, and more CaO xln, even finds that there is C
3s, C
2s, C
3a, C
4a
3the cement clinker mineral compositions such as S exist.Therefore its activity is grey far above common low calcium, and has certain self-hardening property.But high-calcium fly ass still has certain CaO to exist with independent CaO crystalline form, this part free CaO in " dead roasting " state has the duality that is conducive to stimulating activity and is unfavorable for stability.
Specifically, in flyash, calcium oxide occurs to react as follows with water when using as material of construction:
CaO+H
2O=Ca(OH)
2
This reaction has obvious volume effect, and CaO generates Ca (OH)
2generation enormousness changes, if CaO belongs to active condition, before concrete setting, reacts complete, does not affect concrete character; If CaO does not belong to active condition, and exists with the form of independent CaO crystal, this part free CaO (f-CaO) in " dead roasting " state continues reaction and generates Ca (OH) after concrete setting
2, because volume effect causes concrete cracking, stability is defective.
There are certain mistaken ideas in the comprehensive utilization around high-calcium fly ass at present, a kind of method is to carry out simply milled processed, the fineness that improves flyash is surfactivity, free CaO in " dead roasting " state in process of lapping also becomes thinner, it is cleared up and has certain effect, and the incorporation of high-calcium fly ass in cement can improve approximately 5% left and right.Another kind method is to add a large amount of digestion agents, comprises water, trolamine, inorganic salt etc., thoroughly clears up free CaO.Cost is very high on the one hand for this method, uses in a large number on the other hand digestion agent, the corrosion of reinforcing bar in residual inorganic salt meeting accelerate concrete, and excessive water remains in flyash, because high-calcium fly ass has self-hardening property, can cause caking.
Summary of the invention
Technical problem to be solved by this invention is: the defective problem of stability existing when overcoming existing high-calcium fly ass and using as material of construction and a large amount of use digestion agent processing costs high, easily cause the problems such as flyash caking, improve the mixed ratio of flyash in cement.
The invention provides a kind of digestion procedure of flyash free calcium oxide, the method is to be greater than 10%(weight percent for calcium oxide content) flyash, it is so-called high-calcium fly ass, in the technical foundation of existing milled processed, spray into water smoke, clear up part free calcium oxide, thereby by strict control water smoke straying quatity and milling time, avoid caking, improved the mixed ratio of flyash in cement.
The digestion procedure of flyash free calcium oxide of the present invention, comprises the steps:
(1) flyash is joined to ball mill, in ball mill, spray into water smoke, wherein, the weight ratio of described water smoke straying quatity and described flyash Free CaO is 1.5-2.0:1;
(2) described flyash is ground under water smoke condition, the milling time of described flyash in ball mill is controlled at 25-30 minute.
The digestion procedure of aforesaid flyash free calcium oxide, the weight of the free calcium oxide that flyash has been cleared up by described digestion procedure be clear up front flyash Free CaO weight 80% to 90%.
On the other hand, the invention provides a kind of flyash, by aforesaid digestion procedure, made.
Aforesaid flyash, wherein, the weight of described flyash Free CaO be clear up front free calcium oxide weight 10% to 20%.
Aforesaid flyash, wherein, by weight percentage, described flyash mixing than being 20%-75% in cement.
Aforesaid flyash, wherein, by weight percentage, described flyash mixing than being 25%-70% in cement.
The application of aforesaid flyash in preparing cement.
On the other hand, the invention provides a kind of cement, by weight percentage, contain aforesaid flyash 20-75%, grain slag powder 7-15%, cement clinker powder 13-65%.
Aforesaid cement, wherein, by weight percentage, contains described flyash 25%-70%, described cement clinker powder 15-65%.
Aforesaid cement, wherein, by weight percentage, described cement clinker powder is by cement clinker 85-90%, gypsum 3-7%, coal gangue 5-10% grinds and obtains.
By method of the present invention, process high-calcium fly ass, increased the specific surface area of flyash, improved flyash gel active; The residence time in ball mill by strict control water smoke straying quatity and high-calcium fly ass, thereby realize part, clear up free calcium oxide.
At present, flyash comprises that high-calcium fly ass is applied to manufacture of cement and mostly all adopts simple grinding with increase flyash gel activity, improves the gel of flyash in cement active, and high-calcium fly ass also has certain benefit to clearing up free calcium oxide after diminishing simultaneously.
The present invention, on original simple grinding system, has increased a set of water injection system, and the system investment therefore increasing is all very little with running cost.Principle of the present invention is that the water spraying into reacts generation Ca (OH) with f-CaO
2generation enormousness changes, and particle becomes large or produces slight crack, the impact of having cleared up particle surface f-CaO on the one hand, particle become large or produce slight crack be easy to particle further in grinding by porphyrize, thereby particle exposes new surface, f-CaO is further cleared up.Process of lapping produces a large amount of heat energy, and the gasification of being heated of excessive water is discharged system with grinding air-flow, has prevented that the residual powder of excessive water from causing caking phenomenon to produce.
Adopt method of the present invention to realize the object of content and the incorporation of raising high-calcium fly ass in cement or concrete of minimizing high-calcium fly ass Free CaO, by weight percentage, the maximum of the flyash of having cleared up free calcium oxide impact obtaining by method of the present invention in cement mixed than reaching 80%.The flyash that method of the present invention is obtained, for manufacture of cement, can reduce manufacture of cement cost greatly.
Accompanying drawing explanation
Fig. 1 is the structural representation of method equipment therefor of the present invention.
Wherein, the implication of Reference numeral is described as follows:
1-filler bin
2-push-pull valve
The 3-the first star-shaped dust-discharging valve
4-electronic weighing balance
5-metering water smoke spraying plant
6-ball mill
7-flap valve
8-spiral shell thatch blower fan
9-air flume
10-chapelet
11-refined powder coal ash storehouse
12-dust-precipitator
13-worm conveyor
The 14-the second star-shaped dust-discharging valve
15-variable valve
16-centrifugal blower
17-exhaust tube
Embodiment
Flyash refers to that modern large coal-fired boiler grinds coal dust to 100 μ m when fire coal, then coal dust and high speed oxygen flow mix, spray in hearth combustion band, the organic substance in pulverized coal particle is fully burned, the fine powder reclaiming from flue gas is flyash.The mixture that coal is comprised of many kinds of substance, wherein incombustible mineral substance is decomposed and separates out as ash after burning, becomes ash or slag, the mineral residue that it is comprised of oxide compounds such as silicon, aluminium, iron, calcium, magnesium after cooling.The chemical composition of flyash depends on coal-fired composition, and calcium oxide content is greater than 10% flyash and is called high-calcium fly ass.
Cement clinker is Portland clinker, is by containing CaO, SiO
2, Al
2o
3, Fe
2o
3raw material in suitable ratio, wear into fine powder and burn till partially molten state, resultingly take the hydraulicity gum material that Calucium Silicate powder is essential mineral composition.
Gypsum refers to oblique system mineral, and main chemical compositions is CaSO
4.
Coal gangue refers to the solid waste discharging in coal mining process and coal washing process, is a kind of lower with the carbon content of coal seam association in coalification course, harder than coal black gray expandable rock, and its main component is Al
2o
3and SiO
2, also contain in addition the Fe that quantity does not wait
2o
3, CaO, MgO, Na
2o, K
2o, P
2o
5, SO
3with micro-rare elements (gallium, vanadium, titanium, cobalt).
Grain slag refers to the blast furnace slag of hot melt state is placed in to the water cooling and material that obtains rapidly, wherein blast furnace slag refers to the refuse of discharging from blast furnace while smelting the pig iron, when furnace temperature reaches 1400-1600 ℃, furnace charge melting, gangue in ore, the ash content in coke and solubility promoter and other can not enter impurity in the pig iron and form and take silicate and aluminate and float over the slag above molten iron as main, and in blast furnace slag, main component is CaO, SiO
2, Al
2o
3, in the present invention, by weight percentage, its main component is 12-15%CaO, 50-55%SiO
2, 15-20%Al
2o
3.
Below with reference to Fig. 1, method of the present invention is described, processing method of the present invention is except following content, and all the other all adopt ordinary method or the device of this area.
The digestion procedure of flyash free calcium oxide of the present invention, comprises the steps:
(1) flyash is joined to ball mill, in ball mill, spray into water smoke, wherein, the weight ratio of described water smoke straying quatity and described flyash Free CaO is 1.5-2.0:1;
(2) described flyash is ground under water smoke condition, the milling time of described flyash in ball mill is controlled at 25-30 minute.
The high-calcium fly ass that forms as follows take below as example is described in detail, adopt
the high thin and tall product abrading-ball grinding machine of rice is grinding system primary device, ball mill allocating power 570KW, and flyash treatment capacity is 35 tons/hour, grinding machine afterbody is established bagroom, to grinding machine inner ventilation and to total system, form negative pressure, maximum wind speed 1.8m/s in mill, the maximum exhaust air rate 30000m of dust collecting fan
3/ h, establishes frequency converter blower fan is carried out to air quantity control, by air quantity, is regulated and is controlled output.
The chemical composition following (%) of high-calcium fly ass:
Concrete steps are as follows:
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that the first star-shaped dust-discharging valve 3 and electronic weighing balance 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 35 tons/hour, by metering water smoke spraying plant 5, in ball mill 6, spray into water smoke, the weight ratio of water smoke straying quatity and high-calcium fly ass Free CaO is 1.5-2.0:1 simultaneously.The residence time of high-calcium fly ass in ball mill is controlled at 25-30 minute, and by abovementioned steps, the free calcium oxide of being cleared up in high-calcium fly ass is the 80%-90%(weight percent of clearing up front free calcium oxide).A flyash part after clearing up directly falls into air flume 9 through flap valve 7, then sends into refined powder coal ash storehouse 11 through chapelet 10, and air flume 9 power gas sources are from spiral shell thatch blower fan 8; Flyash another part after clearing up enters dust-precipitator 12 with tail gas by pipeline, through dust-precipitator 12 separation, flyash is given to chapelet 10 through worm conveyor 13 and the second star-shaped dust-discharging valve 14 and sends into refined powder coal ash storehouse 11, tail gas is through variable valve 15, centrifugal blower 16, by the outer row of exhaust tube 17.
The weight of the free calcium oxide that flyash has been cleared up by above-mentioned digestion procedure be clear up front flyash Free CaO weight 80% to 90%.The flyash of the ratio of clearing up is like this particularly suitable for preparing cement, and its maximum in cement is mixed than reaching 80%, thereby can greatly reduce the production cost of cement.Clear up ratio (clear up free calcium oxide account for the weight ratio of clearing up front flyash Free CaO) and be less than 80% or be greater than 90% flyash mixing than all less in cement, all do not reach above-mentioned effect, for example, the ratio of clearing up is that 65% the flyash maximum in cement is mixed than reaching 50%, and the cooling placement of flyash that the ratio of clearing up is 95% was understood after 10 hours, generation is united, caking phenomenon, cannot evenly mix with cement clinker powder and grain slag powder, therefore cannot be for the preparation of cement.
On the other hand, the invention provides a kind of flyash, by aforesaid digestion procedure, obtained.Wherein, the weight of described flyash Free CaO be clear up front free calcium oxide weight 10% to 20%.By weight percentage, described flyash mixing than being 20%-75% in cement, preferably 25%-70%.Described flyash can be used for preparing cement.
In a kind of embodiment, adopt method of the present invention can clear up 85%(weight percent in flyash) free calcium oxide, the flyash obtaining after clearing up mixing than for 30-75%(weight percent in cement).
In another kind of embodiment, adopt method of the present invention can clear up 80%(weight percent in flyash) free calcium oxide, the flyash obtaining after clearing up mixing than for 25-70%(weight percent in cement).
In another kind of embodiment, adopt method of the present invention can clear up 90%(weight percent in flyash) free calcium oxide, the flyash obtaining after clearing up mixing than for 35-80%(weight percent in cement).
On the other hand, the invention provides a kind of cement, by weight percentage, contain aforesaid flyash 20-75%, be preferably 25-70%, grain slag powder 7-15%, cement clinker powder 13-65%, is preferably 15-65%.
Aforesaid cement, wherein, by weight percentage, described cement clinker powder is by cement clinker 85-90%, gypsum 3-7%, coal gangue 5-10% grinds and obtains.
Aforesaid cement, wherein, by weight percentage, when described flyash mixing than being that 20%(is the described flyash that contains 20 weight parts in every 100 parts by weight of cement in cement, below in the time of in like manner), 3 days ultimate compression strength of cement are not less than 15.0MPa, and within 28 days, ultimate compression strength is not less than 42.5MPa, within 3 days, folding strength is not less than 3.5MPa, and within 28 days, folding strength is not less than 6.5MPa; When described flyash mixing when being 50% in cement, 3 days ultimate compression strength of cement are not less than 10.0MPa, and within 28 days, ultimate compression strength is not less than 32.5MPa, and within 3 days, folding strength is not less than 2.5MPa, and within 28 days, folding strength is not less than 5.5MPa; When described flyash mixing when being 60% in cement, 28 days ultimate compression strength of cement are not less than 32.5MPa, and within 28 days, folding strength is not less than 5.5MPa; When described flyash mixing when being 70% in cement, 7 days ultimate compression strength of cement are not less than 10.0MPa, and within 28 days, ultimate compression strength is not less than 22.5MPa, and within 7 days, folding strength is not less than 2.0MPa, and within 28 days, folding strength is not less than 4.0MPa; When described flyash mixing when being 75% in cement, 7 days ultimate compression strength of cement are not less than 7.0MPa, and within 28 days, ultimate compression strength is not less than 12.5MPa, and within 7 days, folding strength is not less than 1.5MPa, and within 28 days, folding strength is not less than 3.0MPa.
Embodiment
In embodiment, product is according to GB/T17671-1999 Test method for strength of hydraulic cement mortar (ISO method), GB1346-2011 cement normal consistency water consumption, time of coagulation, the stability method of inspection, GB1345-2005-T cement fineness method of inspection sieve formula, carries out related assays.
In embodiments of the invention, relate generally to following material:
(1) high-calcium fly ass, by weight percentage, the chemical composition of high-calcium fly ass used following (%) in the present invention:
(2) cement clinker powder, by weight percentage, cement clinker powder used in the present invention is with cement clinker 87%, gypsum 5.0%, coal gangue 8.0% adopts that traditional grinding technique is common to be ground and obtain, and the specific surface area of cement clinker powder is: 400m
2more than/kg.Wherein, by weight percentage, the chemical composition of cement clinker following (%):
By weight percentage, the mineral composition of cement clinker following (%):
| Index | C 3S | C 2S | C 3A | C 4AF | KH | KH- | n | p |
| Numerical value | 61.28 | 14.62 | 6.06 | 11.46 | 0.93 | 0.92 | 2.5 | 1.25 |
(3) grain slag powder, grain slag powder is adopted traditional grinding technique to grind and is obtained by grain slag, and the specific surface area of grain slag powder is: 450m
2more than/kg.Wherein, by weight percentage, the chemical composition of grain slag following (%):
Above-mentioned high-calcium fly ass, cement clinker, gypsum, coal gangue, grain slag can conventional commercial obtaining, for example, high-calcium fly ass purchased from Inner Mongol Da Qi power plant, cement clinker purchased from Inner Mongol Wulan Cement factory, gypsum purchased from Etuoke Banner Hua Wei gypsum factory, coal gangue purchased from Han Tai colliery, the Inner Mongol, grain slag purchased from Inner Mongol Baotou Iron and Steel Company.
Embodiment 1
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that star-shaped dust-discharging valve 3 and electronic weighing balance 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 35 tons/hour, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, measure water smoke spraying plant 5 simultaneously and in ball mill 6, spray into water smoke with the speed of 1.55 tons/hour, the weight ratio that is water smoke straying quatity and high-calcium fly ass Free CaO is 1.65:1, make high-calcium fly ass under water smoke, carry out grinding for 28 minutes, from refined powder coal ash storehouse, 11 flyash of collecting clearing up, obtain sample 1-1#.Wherein, by weight percentage, the free calcium oxide of having cleared up is to clear up 85% of front free calcium oxide.
Embodiment 2
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that star-shaped dust-discharging valve 3 and electronic weighing balance 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 37 tons/hour, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, measure water smoke spraying plant 5 simultaneously and in ball mill 6, spray into water smoke with the speed of 1.49 tons/hour, the weight ratio that is water smoke straying quatity and high-calcium fly ass Free CaO is 1.5:1, make high-calcium fly ass under water smoke, carry out grinding for 26 minutes, from refined powder coal ash storehouse, 11 flyash of collecting clearing up, obtain sample 1-2#.Wherein, by weight percentage, the free calcium oxide of having cleared up is to clear up 80% of front free calcium oxide.
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that star-shaped dust-discharging valve 3 and electronic weighing balance 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 32 tons/hour, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, measure water smoke spraying plant 5 simultaneously and in ball mill 6, spray into water smoke with the speed of 1.72 tons/hour, the weight ratio that is water smoke straying quatity and high-calcium fly ass Free CaO is 2.0:1, make high-calcium fly ass under water smoke, carry out grinding for 30 minutes, from refined powder coal ash storehouse, 11 flyash of collecting clearing up, obtain sample 1-3#.Wherein, by weight percentage, the free calcium oxide of having cleared up is to clear up 90% of front free calcium oxide.
Comparative example 1
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that star-shaped dust-discharging valve 3 and electronic scale metering 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 35 tons/hour, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, high-calcium fly ass carries out grinding for 27 minutes, and from refined powder coal ash storehouse, 11 flyash of collecting clearing up, obtain sample 2-1#.
Comparative example 2
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that star-shaped dust-discharging valve 3 and electronic weighing balance 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 35 tons/hour, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, measure water smoke spraying plant 5 simultaneously and in ball mill 6, spray into water smoke with the speed of 1.13 tons/hour, the weight ratio that is water smoke straying quatity and high-calcium fly ass Free CaO is 1.2:1, make high-calcium fly ass under water smoke, carry out grinding for 27 minutes, from refined powder coal ash storehouse, 11 flyash of collecting clearing up, obtain sample 2-2#.Wherein, by weight percentage, the free calcium oxide of having cleared up is to clear up 65% of front free calcium oxide.
Comparative example 3
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system that star-shaped dust-discharging valve 3 and electronic weighing balance 4 form, automatic weighing system adds ball mill 6 by high-calcium fly ass continuously automatically with the speed of 35 tons/hour, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, measure water smoke spraying plant 5 simultaneously and in ball mill 6, spray into water smoke with the speed of 2.35 tons/hour, the weight ratio that is water smoke straying quatity and high-calcium fly ass Free CaO is 2.5:1, make high-calcium fly ass under water smoke, carry out grinding for 45 minutes, from refined powder coal ash storehouse, 11 flyash of collecting clearing up, obtain sample 2-3#.Wherein, by weight percentage, the free calcium oxide of having cleared up is to clear up 95% of front free calcium oxide.
Application Example
The cooling placement of sample 2-3# produces after 10 hours and unites, caking phenomenon, cannot evenly mix with cement clinker powder and grain slag powder, therefore cannot be for the preparation of cement.By sample 1-1#, 1-2#, 1-3#, 2-1# and 2-2# carry out conventional mechanical with cement clinker powder and grain slag powder respectively and mix to prepare cement, 20 tons of the every batch of combined amount, therefrom sample 2 kilograms according to GB/T17671-1999 Test method for strength of hydraulic cement mortar (ISO method), GB1346-2011 cement normal consistency water consumption, time of coagulation, the stability method of inspection, GB1345-2005-T cement fineness method of inspection sieve formula, carry out specific surface area, stability, the tests such as intensity, wherein, the weight percent of grain slag powder is 10%, the weight percent of cement clinker powder changes with the change of high-calcium fly ass weight percent, three's weight percent sum is 100%.Test result is as shown in table 1-5.
The measurement result table of table 1 sample 1-1#
The measurement result table of table 2 sample 1-2#
The measurement result table of table 3 sample 1-3#
The measurement result table of table 4 sample 2-1#
The measurement result table of table 5 sample 2-2#
By table 1 to table 5, can be found out, first, adopt simple grind (comparative example 1) can make the maximum of high-calcium fly ass in cement mix than reaching 48%, but be still starkly lower than the high-calcium fly ass that method of the present invention was processed; The 80-90%(weight percent obtaining after adopting the inventive method to process high-calcium fly ass) secondly, the maximum of the flyash that free calcium oxide has been cleared up in cement mixed than apparently higher than adopting other processing condition to clear up the flyash obtaining after free calcium oxide; In addition, under identical mixed ratio, the prepared cement of flyash that the prepared cement of the flyash that adopts the inventive method to process obtains after being better than adopting other processing condition to clear up free calcium oxide aspect three days anti-foldings, ultimate compression strength and 28 days anti-foldings, ultimate compression strength.
Claims (10)
1. a digestion procedure for flyash free calcium oxide, comprises the steps:
(1) flyash is joined to ball mill, in ball mill, spray into water smoke, wherein, the weight ratio of described water smoke straying quatity and described flyash Free CaO is 1.5-2.0:1;
(2) described flyash is ground under water smoke condition, the milling time of described flyash in ball mill is controlled at 25-30 minute.
2. the digestion procedure of flyash free calcium oxide as claimed in claim 1, is characterized in that, the weight of the free calcium oxide that flyash has been cleared up by described digestion procedure be clear up front flyash Free CaO weight 80% to 90%.
3. a flyash, is made by the digestion procedure described in claim 1 or 2.
4. flyash as claimed in claim 3, is characterized in that, the weight of described flyash Free CaO be clear up front free calcium oxide weight 10% to 20%.
5. the flyash as described in claim 3 or 4, is characterized in that, by weight percentage, and described flyash mixing than being 20%-75% in cement.
6. the flyash as described in claim 3-5, is characterized in that, by weight percentage, and described flyash mixing than being 25%-70% in cement.
7. the application of the flyash described in claim 3-6 any one in preparing cement.
8. a cement, by weight percentage, contains the flyash 20-75% described in claim 3-6 any one, grain slag powder 7-15%, cement clinker powder 13-65%.
9. cement as claimed in claim 8, is characterized in that, by weight percentage, contains described flyash 25%-70%, described cement clinker powder 15-65%.
10. cement as claimed in claim 8 or 9, is characterized in that, by weight percentage, described cement clinker powder is by cement clinker 85-90%, gypsum 3-7%, and coal gangue 5-10% grinds and obtains.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106733070A (en) * | 2016-11-16 | 2017-05-31 | 巨石集团有限公司 | The production method and grinding mechanism of a kind of milled glass fiber |
| CN113588399A (en) * | 2021-07-29 | 2021-11-02 | 宝武集团环境资源科技有限公司 | Quick digestion method for free calcium oxide in metallurgical dust and mud |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279824A (en) * | 2008-06-04 | 2008-10-08 | 长安大学 | Method for preparing high-calcium fly-ash cement with high-calcium fly-ash |
| CN103265192A (en) * | 2013-03-01 | 2013-08-28 | 魏昭荣 | Method for producing lightweight partition board by sulfur fixation fly ash |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279824A (en) * | 2008-06-04 | 2008-10-08 | 长安大学 | Method for preparing high-calcium fly-ash cement with high-calcium fly-ash |
| CN103265192A (en) * | 2013-03-01 | 2013-08-28 | 魏昭荣 | Method for producing lightweight partition board by sulfur fixation fly ash |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106733070A (en) * | 2016-11-16 | 2017-05-31 | 巨石集团有限公司 | The production method and grinding mechanism of a kind of milled glass fiber |
| CN113588399A (en) * | 2021-07-29 | 2021-11-02 | 宝武集团环境资源科技有限公司 | Quick digestion method for free calcium oxide in metallurgical dust and mud |
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| CN103553390B (en) | 2015-12-23 |
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