CN103553390B - The digestion procedure of flyash free calcium oxide and application thereof - Google Patents
The digestion procedure of flyash free calcium oxide and application thereof Download PDFInfo
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- CN103553390B CN103553390B CN201310490520.0A CN201310490520A CN103553390B CN 103553390 B CN103553390 B CN 103553390B CN 201310490520 A CN201310490520 A CN 201310490520A CN 103553390 B CN103553390 B CN 103553390B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a kind of digestion procedure of flyash free calcium oxide, comprise the steps: that flyash is joined ball mill by (1), 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) ground under water smoke condition by described flyash, the milling time of described flyash in ball mill controls at 25-30 minute.This digestion procedure is increasing the specific surface area of flyash, while improving flyash gel active, is cleared up free calcium oxide by part thus is improve the incorporation of flyash in cement or concrete.Present invention also offers the flyash made by described digestion procedure, described flyash can be used for preparing cement.Present invention also offers the cement containing described flyash.
Description
Technical field
The present invention relates to the treatment process of flyash, particularly relate to the digestion procedure of flyash free calcium oxide.
Background technology
Flyash refers to that coal dust grinds to less than 100 μm when fire coal by modern large coal-fired boiler, then coal dust and high velocity air mix, spray in hearth combustion band, the organic substance in pulverized coal particle is fully burned, and the fine powder reclaimed from flue gas is flyash.The mixture that coal is made up of many kinds of substance, wherein incombustible mineral substance to be decomposed precipitations as ash after burning, becomes grey or slag, the mineral residue that it is made up of oxide compounds such as silicon, aluminium, iron, calcium, magnesium after cooling.The chemical composition of flyash depends on coal-fired composition, and the flyash that calcium oxide content is greater than 10% is called high-calcium fly ass.
The application method of existing flyash in building materials it can be used as active principle to mix in cement or concrete.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.Namely ordinary fly ash does not have self-hardening property, ordinary fly ash need with neat portland cement with the use of, limited as its add-on of activity latex material, too much mixing can only as inert fill material, and its incorporation in silicate cement or concrete is limited.
There is a large amount of rich lime glass pearl containing more calcium oxide and the more rich iron glass pearl of iron content 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 far above common low calcium ash, and has certain self-hardening property.But high-calcium fly ass still has certain CaO to exist with independent CaO crystalline form, the free CaO of state that this part is in " dead roasting ", has the duality being conducive to stimulating activity He being unfavorable for stability.
Specifically, in flyash calcium oxide when using as material of construction and water occur to react as follows:
CaO+H
2O=Ca(OH)
2
This reaction has obvious volume effect, and namely CaO generates Ca (OH)
2generation enormousness changes, if CaO belongs to active condition, then reacts complete before concrete setting, does not affect concrete character; If CaO does not belong to active condition, and exist with the form of independent CaO crystal, the free CaO (f-CaO) of state that this part is in " dead roasting ", continue reaction after the concrete has set and generate Ca (OH)
2, because volume effect causes concrete cracking, namely stability is defective.
There are certain mistaken ideas in the comprehensive utilization at present around high-calcium fly ass, one method carries out milled processed simply, improve fineness and the surfactivity of flyash, the free CaO being in " dead roasting " state in process of lapping also becomes thinner, clear up it and have certain effect, the incorporation of high-calcium fly ass in cement can improve about about 5%.Another kind method adds a large amount of digestion agent, comprises water, trolamine, inorganic salt etc., thoroughly clear up free CaO.Cost is very high on the one hand for this method, uses digestion agent in a large number on the other hand, and the corrosion of reinforcing bar in residual inorganic salt meeting accelerate concrete, excessive water remains in flyash, can cause caking because high-calcium fly ass has self-hardening property.
Summary of the invention
Technical problem to be solved by this invention is: overcome the defective problem of stability that exists when existing high-calcium fly ass uses as material of construction and a large amount of use digestion agent processing cost 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 greater than 10%(weight percent for calcium oxide content) flyash, i.e. so-called high-calcium fly ass, the technical foundation of existing milled processed sprays into water smoke, clear up part free calcium oxide, by strictly controlling water smoke straying quatity and milling time thus avoiding luming, improve 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 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) ground under water smoke condition by described flyash, the milling time of described flyash in ball mill controls 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 is 80% to 90% of the weight clearing up front flyash Free CaO.
On the other hand, the invention provides a kind of flyash, be made up of aforesaid digestion procedure.
Aforesaid flyash, wherein, the weight of described flyash Free CaO is 10% to 20% of the weight clearing up front free calcium oxide.
Aforesaid flyash, wherein, by weight percentage, the additive ratio of described flyash in cement is 20%-75%.
Aforesaid flyash, wherein, by weight percentage, the additive ratio of described flyash in cement is 25%-70%.
Aforesaid flyash is preparing the application in cement.
On the other hand, the invention provides a kind of cement, by weight percentage, containing aforesaid flyash 20-75%, grain slag powder 7-15%, cement clinker powder 13-65%.
Aforesaid cement, wherein, by weight percentage, containing 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%, and gypsum 3-7%, coal gangue 5-10% grind and obtain.
Use method of the present invention to process high-calcium fly ass, increase the specific surface area of flyash, improve flyash gel active; By strictly controlling water smoke straying quatity and the residence time of high-calcium fly ass in ball mill, thus realization part clears up free calcium oxide.
At present, flyash comprises high-calcium fly ass and is applied to manufacture of cement and mostly all adopts and simply grind to increase flyash gel active, the raising gel active of flyash in cement, while high-calcium fly ass diminish after also have certain benefit to clearing up free calcium oxide.
The present invention, on original simple grinding system, adds a set of water injection system, and the system investments therefore increased and running cost are all very little.Principle of the present invention is that the water that sprays into and f-CaO react and generates Ca (OH)
2generation enormousness changes, and namely particle becomes large or produces slight crack, has cleared up the impact of particle surface f-CaO on the one hand, particle become large or produce slight crack be easy to particle further in grinding by porphyrize, thus particle exposes new surface, and f-CaO is cleared up further.Process of lapping produces a large amount of heat energy, and excessive water, by thermal evaporation, discharged system with grinding air-flow, prevented excessive water to remain powder and cause caking phenomenon to produce.
Adopt the content that The inventive method achieves and reduce high-calcium fly ass Free CaO and the object improving the incorporation of high-calcium fly ass in cement or concrete, by weight percentage, the maximum additive ratio of flyash in cement having cleared up free calcium oxide impact obtained by method of the present invention can reach 80%.The flyash that method of the present invention obtains is used for manufacture of cement, manufacture of cement cost can be reduced 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
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
14-the second star-shaped dust-discharging valve
15-variable valve
16-centrifugal blower
17-exhaust tube
Embodiment
Flyash refers to that coal dust grinds to less than 100 μm when fire coal by modern large coal-fired boiler, then coal dust and high speed oxygen flow mix, spray in hearth combustion band, the organic substance in pulverized coal particle is fully burned, and the fine powder reclaimed from flue gas is flyash.The mixture that coal is made up of many kinds of substance, wherein incombustible mineral substance to be decomposed precipitations as ash after burning, becomes grey or slag, the mineral residue that it is made up of oxide compounds such as silicon, aluminium, iron, calcium, magnesium after cooling.The chemical composition of flyash depends on coal-fired composition, and the flyash that calcium oxide content is greater than 10% is called high-calcium fly ass.
Cement clinker and Portland clinker are by containing CaO, SiO
2, Al
2o
3, Fe
2o
3raw material wear into fine powder in suitable ratio and burn till partially molten state, what obtain take Calucium Silicate powder as the hydraulic cement material of main mineral constituent.
Gypsum refers to oblique system mineral, and main chemical compositions is CaSO
4.
Coal gangue refers to the solid waste discharged in coal mining process and coal washing process, and be a kind of black gray expandable rock lower, harder than coal with the carbon content of coal seam association in coalification course, its main component is Al
2o
3and SiO
2, also contain the Fe that quantity does not wait in addition
2o
3, CaO, MgO, Na
2o, K
2o, P
2o
5, SO
3with micro-rare elements (gallium, vanadium, titanium, cobalt).
Grain slag refers to that the blast furnace slag of hot melt state is placed in water to be cooled and the material obtained rapidly, the refuse of discharging from blast furnace when wherein blast furnace slag refers to manUfaCtUre of pig iron, when furnace temperature reaches 1400-1600 DEG C, furnace charge melting, gangue in ore, the ash content in coke and solubility promoter and other impurity that can not enter in the pig iron form the slag floated over above molten iron for master with silicate and aluminate, 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.
Be described method of the present invention referring to Fig. 1, 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 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) ground under water smoke condition by described flyash, the milling time of described flyash in ball mill controls at 25-30 minute.
Be described in detail for the high-calcium fly ass formed as follows below, 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 establishes bagroom, to grinding machine inner ventilation and to total system formation negative pressure, maximum wind speed 1.8m/s, the maximum exhaust air rate 30000m of dust collecting fan in mill
3/ h, if frequency converter carries out Boiler pressure control to blower fan, by air quantity regulable control 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 of the first star-shaped dust-discharging valve 3 and electronic weighing balance 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 35 tons/hour by automatic weighing system continuously automatically, in ball mill 6, spray into water smoke by metering water smoke spraying plant 5, 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 controls at 25-30 minute, by abovementioned steps, is the 80%-90%(weight percent clearing up front free calcium oxide in high-calcium fly ass by the free calcium oxide cleared up).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 source is from spiral shell thatch blower fan 8; Flyash another part after clearing up enters dust-precipitator 12 with tail gas by pipeline, be separated through dust-precipitator 12, 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, through variable valve 15, centrifugal blower 16, is arranged by exhaust tube 17 is outer.
The weight of the free calcium oxide that flyash has been cleared up by above-mentioned digestion procedure is 80% to 90% of the weight clearing up front flyash Free CaO.The flyash of ratio of clearing up like this is particularly suitable for preparing cement, and its maximum additive ratio in cement can reach 80%, thus greatly can reduce the production cost of cement.Clear up ratio (free calcium oxide namely cleared up accounts for the weight ratio clearing up front flyash Free CaO) be less than 80% or be greater than 90% the additive ratio of flyash in cement all less, all do not reach above-mentioned effect, such as, the ratio of clearing up be 65% the maximum additive ratio of flyash in cement can only reach 50%, and ratio of clearing up be 95% flyash cooling placement can produce after 10 hours unite, caking phenomenon, cannot with cement clinker powder and grain slag powder Homogeneous phase mixing, therefore cannot for the preparation of cement.
On the other hand, the invention provides a kind of flyash, obtained by aforesaid digestion procedure.Wherein, the weight of described flyash Free CaO is 10% to 20% of the weight clearing up front free calcium oxide.By weight percentage, the additive ratio of described flyash in cement is 20%-75%, preferred 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 additive ratio of the flyash obtained after clearing up in cement is 30-75%(weight percent).
In another kind of embodiment, adopt method of the present invention can clear up 80%(weight percent in flyash) free calcium oxide, the additive ratio of the flyash obtained after clearing up in cement is 25-70%(weight percent).
In another kind of embodiment, adopt method of the present invention can clear up 90%(weight percent in flyash) free calcium oxide, the additive ratio of the flyash obtained after clearing up in cement is 35-80%(weight percent).
On the other hand, the invention provides a kind of cement, by weight percentage, containing aforesaid flyash 20-75%, be preferably 25-70%, grain slag powder 7-15%, cement clinker powder 13-65%, be preferably 15-65%.
Aforesaid cement, wherein, by weight percentage, described cement clinker powder is by cement clinker 85-90%, and gypsum 3-7%, coal gangue 5-10% grind and obtain.
Aforesaid cement, wherein, by weight percentage, described flyash containing 20 weight parts in the additive ratio of described flyash in cement is 20%(and every 100 parts by weight of cement, below, time 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 the additive ratio of described flyash in cement is 50%, 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 the additive ratio of described flyash in cement is 60%, 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 the additive ratio of described flyash in cement is 70%, 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 the additive ratio of described flyash in cement is 75%, 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.
Following material is related generally in embodiments of the invention:
(1) high-calcium fly ass, by weight percentage, the chemical composition following (%) of high-calcium fly ass used in the present invention:
(2) cement clinker powder, by weight percentage, cement clinker powder used in the present invention is with cement clinker 87%, and gypsum 5.0%, coal gangue 8.0% adopts conventional milling techniques co-ground and obtains, and the specific surface area of cement clinker powder is: 400m
2/ more than kg.Wherein, by weight percentage, the chemical composition following (%) of cement clinker:
By weight percentage, the mineral composition following (%) of cement clinker:
| 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 adopts conventional milling techniques to grind by grain slag and obtains, and the specific surface area of grain slag powder is: 450m
2/ more than kg.Wherein, by weight percentage, the chemical composition following (%) of grain slag:
Above-mentioned high-calcium fly ass, cement clinker, gypsum, coal gangue, grain slag can conventional commercially obtain, such as, 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 of star-shaped dust-discharging valve 3 and electronic weighing balance 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 35 tons/hour by automatic weighing system continuously automatically, 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, namely the weight ratio of 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 in 28 minutes, collect the flyash after clearing up from refined powder coal ash storehouse 11, obtain sample 1-1#.Wherein, by weight percentage, the free calcium oxide cleared up is clear up front free calcium oxide 85%.
Embodiment 2
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system of star-shaped dust-discharging valve 3 and electronic weighing balance 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 37 tons/hour by automatic weighing system continuously automatically, 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, namely the weight ratio of 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 in 26 minutes, collect the flyash after clearing up from refined powder coal ash storehouse 11, obtain sample 1-2#.Wherein, by weight percentage, the free calcium oxide cleared up is clear up front free calcium oxide 80%.
Embodiment 3
Under normal temperature, high-calcium fly ass in filler bin 1 is through push-pull valve 2, enter the automatic weighing system of star-shaped dust-discharging valve 3 and electronic weighing balance 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 32 tons/hour by automatic weighing system continuously automatically, 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, namely the weight ratio of 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 in 30 minutes, collect the flyash after clearing up from refined powder coal ash storehouse 11, obtain sample 1-3#.Wherein, by weight percentage, the free calcium oxide cleared up is clear up front free calcium oxide 90%.
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 of star-shaped dust-discharging valve 3 and electronic scale metering 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 35 tons/hour by automatic weighing system continuously automatically, and described ball mill is
the high thin and tall product abrading-ball grinding machine of rice, high-calcium fly ass carries out grinding in 27 minutes, collects the flyash after clearing up, obtain sample 2-1# from refined powder coal ash storehouse 11.
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 of star-shaped dust-discharging valve 3 and electronic weighing balance 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 35 tons/hour by automatic weighing system continuously automatically, 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, namely the weight ratio of 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 in 27 minutes, collect the flyash after clearing up from refined powder coal ash storehouse 11, obtain sample 2-2#.Wherein, by weight percentage, the free calcium oxide cleared up is clear up front free calcium oxide 65%.
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 of star-shaped dust-discharging valve 3 and electronic weighing balance 4 composition, high-calcium fly ass is added ball mill 6 with the speed of 35 tons/hour by automatic weighing system continuously automatically, 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, namely the weight ratio of 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 in 45 minutes, collect the flyash after clearing up from refined powder coal ash storehouse 11, obtain sample 2-3#.Wherein, by weight percentage, the free calcium oxide cleared up is clear up front free calcium oxide 95%.
Application Example
Sample 2-3# cool placement produce after 10 hours unite, caking phenomenon, cannot with cement clinker powder and grain slag powder Homogeneous phase mixing, therefore cannot for the preparation of cement.By sample 1-1#, 1-2#, 1-3#, 2-1# and 2-2# carries out conventional mechanical with cement clinker powder and grain slag powder respectively and mixes to prepare cement, often criticize combined amount 20 tons, 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 as shown in tables 1 to 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#
As can be seen from table 1 to table 5, first, adopt simple grinding (comparative example 1) that the maximum additive ratio of high-calcium fly ass in cement can be made to reach 48%, but be still starkly lower than the high-calcium fly ass of method process of the present invention; Secondly, the 80-90%(weight percent obtained after adopting the inventive method to process high-calcium fly ass) free calcium oxide by maximum additive ratio in cement of the flyash cleared up apparently higher than the flyash obtained after adopting other processing condition to clear up free calcium oxide; In addition, under identical mixed ratio, the cement prepared by flyash obtained after adopting the cement prepared by flyash of the inventive method process to be better than adopting other processing condition to clear up free calcium oxide in 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 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) ground under water smoke condition by described flyash, the milling time of described flyash in ball mill controls at 25-30 minute.
2. the digestion procedure of flyash free calcium oxide as claimed in claim 1, it is characterized in that, the weight of the free calcium oxide that flyash has been cleared up by described digestion procedure is 80% to 90% of the weight clearing up front flyash Free CaO.
3. a flyash, is made up of the digestion procedure described in claim 1 or 2.
4. flyash as claimed in claim 3, it is characterized in that, the weight of described flyash Free CaO is 10% to 20% of the weight clearing up front free calcium oxide.
5. the flyash as described in claim 3 or 4, is characterized in that, by weight percentage, the additive ratio of described flyash in cement is 20%-75%.
6. the flyash as described in claim 3 or 4, is characterized in that, by weight percentage, the additive ratio of described flyash in cement is 25%-70%.
7. the flyash described in any one of claim 3-6 is preparing the application in cement.
8. a cement, by weight percentage, containing the flyash 20-75% described in any one of claim 3-5, grain slag powder 7-15%, cement clinker powder 13-65%.
9. cement as claimed in claim 8, is characterized in that, by weight percentage, containing described flyash 25%-70%, and 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%, and gypsum 3-7%, coal gangue 5-10% grind and obtain.
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| 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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| 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 |
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| 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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