CN105036577A - Method for improving strength of circulating fluidized bed power station fly ash in cement - Google Patents
Method for improving strength of circulating fluidized bed power station fly ash in cement Download PDFInfo
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- CN105036577A CN105036577A CN201510391211.7A CN201510391211A CN105036577A CN 105036577 A CN105036577 A CN 105036577A CN 201510391211 A CN201510391211 A CN 201510391211A CN 105036577 A CN105036577 A CN 105036577A
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- cement
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- calcium sulfate
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a method for improving the strength of circulating fluidized bed power station fly ash in cement. The method comprises the following steps: mixing 100 parts by weight of power station fly ash with 0.01-0.05 parts by weight of a crystal modifier, adding the obtained mixture into a closed reaction kettle, heating to 300-400DEG C, and maintaining for 5min to obtain modified fly ash; and adding 5-30 parts of the modified fly ash into 100 parts of cement clinker to prepare composite cement. A tiny amount of the crystal modifier is added to the fly ash in order to effectively use the fly ash, so desulfurized gypsum in the fly ash undergoes crystal form change at a temperature of 300-400DEG C, and converts into calcium sulfate whiskers. The calcium sulfate whiskers can well improve the physical performances of cement, and the fly ash composite cement prepared under a large addition can reach standards of national 425 cement.
Description
Technical field
The invention belongs to technical field of cement production, relate to a kind of method improving circulating fluidized bed power station flyash intensity in cement.
Background technology
Some power stations adopts dry desulfurization, causes calcium sulphate content in the flyash of power station higher, the higher intensity that can affect complex cement of calcium sulphate content, and therefore flyash can only air storage, cannot be applied in cement.
Summary of the invention
The object of this invention is to provide a kind of method improving circulating fluidized bed power station flyash intensity in cement, solve the complex cement insufficient strength of production and the few problem of flyash addition.
The technical solution adopted in the present invention is, a kind of method improving circulating fluidized bed power station flyash intensity in cement, specifically carries out according to following steps:
Step 1, according to ratio of quality and the number of copies, mixes the power station flyash of 100 parts with the crystal modifier of 0.01-0.05 part, join in airtight reactor, reactor is heated to 300 DEG C-400 DEG C, keep 5 minutes, obtain the flyash after making the transition, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers;
Step 2, according to ratio of quality and the number of copies, the flyash after 5-30 part being made the transition adds in the cement clinker of 100 parts, prepares complex cement.
Preferably, crystal modifier is one or more arbitrary combination in magnesium acetate, Trisodium Citrate, Tai-Ace S 150, ferric sulfate, Sodium dodecylbenzene sulfonate, magnesium chloride.
Preferably, according to ratio of quality and the number of copies, magnesium acetate: Tai-Ace S 150=obtained crystal modifier of 1:1 ratio mixing.
Preferably, according to ratio of quality and the number of copies, Trisodium Citrate: Sodium dodecylbenzene sulfonate=obtained crystal modifier of 1:2 ratio mixing.
Preferably, power station flyash is the flyash of circulating fluidized bed dry desulfurization.
The invention has the beneficial effects as follows, in order to effective powder application coal ash, in flyash, add the crystal modifier of trace, at the temperature of 300-400 DEG C, make the desulfurated plaster generation crystal formation in flyash change, be transformed into calcium sulfate crystal whiskers.Calcium sulfate crystal whiskers can be good at the physicals improving cement, and the flyash compound cement prepared in larger addition situation can reach the standard of national 425 cement.
Embodiment
Improve a method for circulating fluidized bed power station flyash intensity in cement, specifically carry out according to following steps:
Step 1, according to ratio of quality and the number of copies, mixes the power station flyash of 100 parts with the crystal modifier of 0.01-0.05 part, join in airtight reactor, reactor is heated to 300 DEG C-400 DEG C, keep 5 minutes, obtain the flyash after making the transition, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers.
Step 2, according to ratio of quality and the number of copies, the flyash after 5-30 part being made the transition adds in the cement clinker of 100 parts, prepares complex cement.
Wherein, crystal modifier one or more arbitrary combination specifically in magnesium acetate, Trisodium Citrate, Tai-Ace S 150, ferric sulfate, Sodium dodecylbenzene sulfonate, magnesium chloride;
Preferably, according to ratio of quality and the number of copies, magnesium acetate: Tai-Ace S 150=obtained crystal modifier of 1:1 ratio mixing.
Preferably, according to ratio of quality and the number of copies, Trisodium Citrate: Sodium dodecylbenzene sulfonate=obtained crystal modifier of 1:2 ratio mixing.
The flyash used is the flyash of circulating fluidized bed dry desulfurization, containing the calcium sulfate of about 10% in this flyash.
In the field of flyash, when flyash is applied to cement, calcium sulfate in flyash is mainly used for the time of coagulation regulating cement, in cement industry, the common effect of calcium sulfate is all the time of coagulation for regulating cement, calcium sulfate crystal whiskers has no report at refinforced cement aspect of performance, the acquisition of calcium sulfate crystal whiskers must be deposited at crystal modifier and could be obtained in case, crystal modifier add the length-to-diameter ratio that effectively could improve calcium sulfate crystal whiskers, improve further the mechanical property of material.In order to improve the intensity of complex cement, be all adopt in cement, add certain exotic materials, the mechanical property improving cement strengthens, and is therefore difficult to association and the calcium sulfate in flyash is changed into calcium sulfate crystal whiskers is applied in cement.
In the preparation field of calcium sulfate crystal whiskers, carry out in liquid-phase reaction system in the preparation process of calcium sulfate crystal whiskers, calcium sulfate in liquid phase is transformed into calcium sulfate crystal whiskers gradually under the effect of certain temperature, pressure and crystal modifier, calcium sulfate in flyash being transformed into whisker is carry out at a higher temperature in the gas phase, and in the gas phase calcium sulfate being transformed into calcium sulfate crystal whiskers is that preparation field nobody of whole calcium sulfate crystal whiskers studied.Therefore in the preparation field of flyash field and calcium sulfate crystal whiskers, the technical problem that the researchist in respective field is difficult to two fields relate to connects.
For calcium sulfate crystal whiskers, the effect of crystalline form growth substance is mainly reflected in the degree of supersaturation of change calcium sulfate and has an impact to the growth of calcium sulfate crystal whiskers, makes calcium sulphate crystal by one-dimensional square to growth.In the process of growth of whisker, Ca
2+main at (111) crystal face, SO4
2-mainly concentrate on (110) crystal face, the mode of two kinds of ions according to screw dislocation under the effect of crystal modifier grows, and finally forms calcium sulfate crystal whiskers.This several crystal modifier selected is Tai-Ace S 150, ferric sulfate, magnesium chloride can adsorb (110) crystal face, at addition controlling to make whisker along the growth of (111) crystal face in the scope of 0.01-0.05 part, forms the whisker that length-to-diameter ratio is larger.Magnesium acetate, Trisodium Citrate, Sodium dodecylbenzene sulfonate can adsorb (111) crystal face, at addition controlling to make whisker along the growth of (110) crystal face in the scope of 0.01-0.05 part, can form the larger whisker of length-to-diameter ratio too.And other crystal modifiers make the degree of supersaturation of calcium sulfate increase rapidly, cause the excessive generation of calcium sulfate nucleus, in calcium sulfate crystal whiskers process of growth, between nucleus, collision is crosslinked mutually, have impact on the pattern of calcium sulfate crystal whiskers, finally cause calcium sulfate crystal whiskers pattern irregular, major diameter is smaller.
Crystal modifier is the catalyzer that calcium sulfate carries out crystal conversion, the amount adding crystal modifier is that the length-to-diameter ratio of transformation efficiency and calcium sulfate crystal whiskers in order to obtain higher calcium sulfate crystal whiskers is larger, when crystal modifier is less than 0.01 part, the speed that calcium sulfate crystal whiskers generates is comparatively slow, and the transformation efficiency of calcium sulfate crystal whiskers is lower.When crystal modifier is greater than 0.05 part, the calcium sulfate crystal whiskers speed of growth is diametrically very fast, the length-to-diameter ratio of the calcium sulfate crystal whiskers thus obtained diminishes, therefore the content of crystal modifier controls between 0.01-0.05 part, the intensity of the complex cement obtained reaches the national standard of 425 cement, crystal modifier addition exceeds this scope, and the intensity of complex cement all can be made to reduce, and complex cement intensity may lower than the national standard of 425 cement.
Be all reconcile cement setting time with calcium sulfate the technician of cement industry, in the use of current cement, calcium sulfate can not improve the ultimate compression strength of cement, can only change cement setting time.Calcium sulfate crystal whiskers can improve the resistance to compression of material, tensile strength and processing characteristics, and containing calcium sulfate in flyash, if change calcium sulfate in flyash into calcium sulfate crystal whiskers, well may improve the ultimate compression strength of cement, we found through experiments calcium sulfate by changing the intensity that really can improve cement.
Embodiment 1
According to the ratio of 100 parts of power station flyash and 0.01 part of magnesium acetate, flyash and magnesium acetate are mixed to join in airtight reactor, reactor are heated to 300 DEG C, keep 5 minutes, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers.
The coal ash for manufacturing after 5,10,15,20,25,30 parts of transition is added respectively for complex cement in 100 parts of cement clinkers, measure complex cement 28 days ultimate compression strength and reach 48.5MPa, 50.6MPa, 51.3MPa, 48.3MPa, 47.8MPa respectively, the complex cement of above different ratios all can reach the standard of national 425 cement.
Embodiment 2
According to the ratio of 100 parts of power station flyash and 0.02 part of Trisodium Citrate, flyash and Trisodium Citrate are mixed to join in airtight reactor, reactor are heated to 400 DEG C, keep 5 minutes, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers.
The coal ash for manufacturing after 5,10,15,20,25,30 parts of transition is added respectively for complex cement in 100 parts of cement clinkers, measure complex cement 28 days ultimate compression strength and reach 49.1MPa, 51.2MPa, 51.8MPa, 49MPa, 48.5MPa respectively, the complex cement of above different ratios all can reach the standard of national 425 cement.
Embodiment 3
According to the ratio of 100 parts of power station flyash and 0.03 part of Tai-Ace S 150, flyash and Tai-Ace S 150 are mixed to join in airtight reactor, reactor are heated to 350 DEG C, keep 5 minutes, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers.
The coal ash for manufacturing after 5,10,15,20,25,30 parts of transition is added respectively for complex cement in 100 parts of cement clinkers, measure complex cement 28 days ultimate compression strength and reach 49.5MPa, 51.7MPa, 52.2MPa, 49.3MPa, 48.7MPa respectively, the complex cement of above different ratios all can reach the standard of national 425 cement.
Embodiment 4
According to the ratio of 100 parts of power station flyash and 0.04 part of crystal modifier, flyash and crystal modifier are mixed to join in airtight reactor, reactor are heated to 320 DEG C, keep 5 minutes, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers.
Wherein, magnesium acetate: Tai-Ace S 150=obtained crystal modifier of 1:1 ratio mixing.
The coal ash for manufacturing after 5,10,15,20,25,30 parts of transition is added respectively for complex cement in 100 parts of cement clinkers, measure complex cement 28 days ultimate compression strength and reach 49.8MPa, 51.9MPa, 52.5MPa, 49.5MPa, 48.8MPa respectively, the complex cement of above different ratios all can reach the standard of national 425 cement.
Embodiment 5
According to the ratio of 100 parts of power station flyash and 0.05 part of crystal modifier, flyash and crystal modifier are mixed to join in airtight reactor, keep 5 minutes at the temperature of 380 DEG C, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers.
Wherein, Trisodium Citrate: Sodium dodecylbenzene sulfonate=obtained crystal modifier of 1:2 ratio mixing.
The coal ash for manufacturing after 5,10,15,20,25,30 parts of transition is added respectively for complex cement in 100 parts of cement clinkers, measure complex cement 28 days ultimate compression strength and reach 49.4MPa, 51.5MPa, 52.3MPa, 49.1MPa, 48.2MPa respectively, the complex cement of above different ratios all can reach the standard of national 425 cement.
The addition of crystal modifier is increased to more than 0.05 part again, complex cement intensity is improved and there is no practical function, optimum addition is 0.04, if it is best for being 0.01 part from the angle consideration addition of economy, and complex cement strength also can reach the standard of 425 cement.
Therefore can find out, in the present invention, crystal modifier add-on is 0.01-0.05 part, is heated to 300-400 DEG C, keeps 5 minutes, and adding in the cement clinker of 100 parts according to the flyash after 5-30 part makes the transition, is the net result obtained through great many of experiments.Flyash in flyash after calcium sulfate crystal whiskers transformation process simple, transition directly can mix with cement clinker, simplifies the production technique of complex cement.
Claims (5)
1. improve a method for circulating fluidized bed power station flyash intensity in cement, it is characterized in that, specifically carry out according to following steps:
Step 1, according to ratio of quality and the number of copies, mixes the power station flyash of 100 parts with the crystal modifier of 0.01-0.05 part, join in airtight reactor, reactor is heated to 300 DEG C-400 DEG C, keep 5 minutes, obtain the flyash after making the transition, make the calcium sulfate in flyash be transformed into calcium sulfate crystal whiskers;
Step 2, according to ratio of quality and the number of copies, the flyash after 5-30 part being made the transition adds in the cement clinker of 100 parts, prepares complex cement.
2. a kind of method improving circulating fluidized bed power station flyash intensity in cement according to claim 1, it is characterized in that, described crystal modifier is one or more arbitrary combination in magnesium acetate, Trisodium Citrate, Tai-Ace S 150, ferric sulfate, Sodium dodecylbenzene sulfonate, magnesium chloride.
3. a kind of method improving circulating fluidized bed power station flyash intensity in cement according to claim 1, is characterized in that, according to ratio of quality and the number of copies, and magnesium acetate: Tai-Ace S 150=obtained crystal modifier of 1:1 ratio mixing.
4. a kind of method improving circulating fluidized bed power station flyash intensity in cement according to claim 1, is characterized in that, according to ratio of quality and the number of copies, and Trisodium Citrate: Sodium dodecylbenzene sulfonate=obtained crystal modifier of 1:2 ratio mixing.
5. a kind of method improving circulating fluidized bed power station flyash intensity in cement according to claim 1, is characterized in that, described power station flyash is the flyash of circulating fluidized bed dry desulfurization.
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| CN201510391211.7A CN105036577B (en) | 2015-07-06 | 2015-07-06 | A kind of method for improving recirculating fluidized bed power station flyash intensity in cement |
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| CN201510391211.7A CN105036577B (en) | 2015-07-06 | 2015-07-06 | A kind of method for improving recirculating fluidized bed power station flyash intensity in cement |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60176998A (en) * | 1984-02-17 | 1985-09-11 | Hiroshi Ogawa | Preparation of high-quality crystal of zinc telluride |
| CN101311337A (en) * | 2008-04-25 | 2008-11-26 | 东北大学 | Process for preparing calcium sulphate whiskers by using flue gas desulfurization gypsum |
| CN101876087A (en) * | 2010-04-08 | 2010-11-03 | 山东科技大学 | Method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in waste incineration flue gas |
| CN102634847A (en) * | 2012-04-25 | 2012-08-15 | 昆明理工大学 | Method for surface modification of calcium sulfate crystal whisker |
| CN102965721A (en) * | 2012-11-13 | 2013-03-13 | 沈阳化工大学 | Method for preparing calcium sulfate crystal whisker in low cost |
-
2015
- 2015-07-06 CN CN201510391211.7A patent/CN105036577B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60176998A (en) * | 1984-02-17 | 1985-09-11 | Hiroshi Ogawa | Preparation of high-quality crystal of zinc telluride |
| CN101311337A (en) * | 2008-04-25 | 2008-11-26 | 东北大学 | Process for preparing calcium sulphate whiskers by using flue gas desulfurization gypsum |
| CN101876087A (en) * | 2010-04-08 | 2010-11-03 | 山东科技大学 | Method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in waste incineration flue gas |
| CN102634847A (en) * | 2012-04-25 | 2012-08-15 | 昆明理工大学 | Method for surface modification of calcium sulfate crystal whisker |
| CN102965721A (en) * | 2012-11-13 | 2013-03-13 | 沈阳化工大学 | Method for preparing calcium sulfate crystal whisker in low cost |
Non-Patent Citations (2)
| Title |
|---|
| 何玉鑫等: "脱硫石膏晶须改善水泥性能的研究", 《材料导报》 * |
| 王道正等: "脱硫石膏晶须对水泥石性能的影响", 《矿物学报》 * |
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