CN103274614B - Method for producing low-grade early strength silicate cement with dry rotary kiln - Google Patents
Method for producing low-grade early strength silicate cement with dry rotary kiln Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 239000003469 silicate cement Substances 0.000 title claims abstract description 20
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 105
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000000292 calcium oxide Substances 0.000 claims abstract description 29
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 13
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002918 waste heat Substances 0.000 claims abstract description 7
- 230000008961 swelling Effects 0.000 claims description 21
- 239000010440 gypsum Substances 0.000 claims description 20
- 229910052602 gypsum Inorganic materials 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 14
- 239000001095 magnesium carbonate Substances 0.000 claims description 11
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 11
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 11
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 11
- 239000011777 magnesium Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000391 magnesium silicate Substances 0.000 claims description 2
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 2
- 235000019792 magnesium silicate Nutrition 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 58
- 230000006835 compression Effects 0.000 description 48
- 238000007906 compression Methods 0.000 description 48
- 230000002742 anti-folding effect Effects 0.000 description 45
- 239000004567 concrete Substances 0.000 description 30
- 230000004927 fusion Effects 0.000 description 14
- 230000000740 bleeding effect Effects 0.000 description 9
- 238000010276 construction Methods 0.000 description 9
- 230000011218 segmentation Effects 0.000 description 9
- 238000001354 calcination Methods 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- 229910052791 calcium Inorganic materials 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000011405 expansive cement Substances 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- YLUIKWVQCKSMCF-UHFFFAOYSA-N calcium;magnesium;oxygen(2-) Chemical class [O-2].[O-2].[Mg+2].[Ca+2] YLUIKWVQCKSMCF-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003818 cinder Substances 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 150000004683 dihydrates Chemical class 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 238000003837 high-temperature calcination Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 208000013201 Stress fracture Diseases 0.000 description 2
- 239000010424 alunite Substances 0.000 description 2
- 229910052934 alunite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000011419 magnesium lime Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A method for producing low-grade early strength silicate cement with a dry rotary kiln comprises the steps of adding particle materials containing magnesium oxide into a space region between a cooling zone of the rotary kiln and a kilneye through which materials are fed into a high temperature section of a grate cooler, incompletely roasting the particle materials containing magnesium oxide with waste heat of a high-temperature clinker when the burnt high-temperature clinker enters a cooling process, obtaining an expanding agent containing soft burning magnesium oxide or a clinker containing soft burning magnesium oxide and a calcium oxide expanding agent, and producing the low-grade early strength silicate cement by a general silicate cement producing method. The method employs the existing dry cement production line for production, the thermal loss is not increased, the cost is low, and the problems of microcracks and splintering caused by the volume shrinkage characteristic of the cement can be solved.
Description
Technical field
The present invention relates to a kind of method of producing silicate cement, especially relate to a kind of method of dry-process rotary kiln production microdilatancy early strength silicate cement.
Background technology
Silicate cement is as the most large building cementing material, and the volume stability of its maturing has become one of key subjects in concrete works technology.As everyone knows, concrete can bear higher stress, and its tensile strength is generally all no more than 10% of ultimate compression strength.In theory, under Complete Bind condition, about 3MPa to tens MPa(of tensile stress that inside concrete produces depends on volume change characteristic and the elastic properties of concrete).So when concrete is tied, because the tensile stress of the excessive generation of volume change is once exceed himself tensile strength, the concrete cracking that is just bound to cause, produces a large amount of microfractures.The volume change common situations of maturing have dry wet collapse, expand with heat and contract with cold, autogenous volumetric deformation (expand or shrink), Carbonization contract, cement security are bad, aggregate volume stability, alkali one aggregate reaction, sulphate attack, saline crystallization etc., and as the silicate cement of concrete core material, whether good its autogenous volumetric deformation and stability be is the most critical issue.
Concrete autogenous volume shrinks a kind of essential property of the main hydration products calcium silicate hydrate that is silicate cement, is also called chemical shrinkage.Concrete this volumetric shrinkage distortion is irreclaimable, and it shrinks with extending the length of time of concrete increases.Use the concrete of expansive cement or swelling agent, can expand by autogenous volume, compensation concrete autogenous volume shrinks, and provides a good approach for solving contraction problem.
Compensate for shrinkage concrete expansive cement used and swelling agent, can roughly be divided into five large classes: calcium sulphoaluminate class, calcium oxide, magnesium oxide class, iron oxides and aluminium powder class.At present, the most frequently used is calcium sulphoaluminate class expansive cement or swelling agent and calcium oxide and magnesium oxide class swelling agent.Utilize the compensate for shrinkage concrete of calcium sulphoaluminate class, calcium oxide, the preparation of magnesium oxide class swelling agent in setting and harden, can produce autogenous volume expansion.These conventional swelling agents adopt special roasting apparatus and explained hereafter, in the time of preparation concrete, add in proportion together with cement.
Relatively inexpensive effective magnesium oxide class swelling agent, its mechanism of intumescence is as follows:
Magnesite MgCO
3be heated to 600 ℃ and resolve into above MgO, 1000 ℃ of MgO with interior generation are microlitic, meet the easy aquation of water, and 1500-1600 ℃ forms the periclasite of fine and close crystalloid, be difficult for aquation.Rhombspar CaMg (CO
3)
2be heated to 740 ℃ of left and right, first set reaction occur and be decomposed into free magnesium oxide and calcium carbonate, at about 880 ℃, reaction for the second time occurs, be equivalent to Decomposition of Calcium Carbonate.
Because part Wingdale contains MgCO
3, Portland clinker system forms through about 1450 ℃ calcinings, thereby wherein contains 2%-4% periclasite (MgO), and the MgO aquation of this compact crystallization becomes Mg (OH)
2process very slow, excessive high-temperature calcination MgO can produce late expansion, causes destroying concrete structure, thereby, MgO≤4.5% in external cement standard regulation cement clinker, China's standard is now determined < 5%.That is to say, in cement through normally oxious component of the MgO of high-temperature calcination.But, the easier aquation of light MgO of 1000 ℃ of following calcinings, MgO aquation generates Mg (OH)
2shi Tiji increases 94.1%-123.8%.
Former Soviet Union Б у ц н ч к o в etc. utilizes this expansion principle, temperature special calcination white clouds masonry expansion component at 800-900 ℃ is proposed with professional equipment, join grinding in Portland clinker with 5%-7% and become magnesia expansive cement, the concrete of preparation has the rate of expansion of 0.1%-0.36%.Mehta studies and thinks, MgO grinding after 900-950 ℃ of calcining, between 300-1200 μ m, joins this grinding periclasite in silicate cement with 5%, can obtain the expansive concrete requiring.Nanjing Chemical Engineering College also utilizes magnesite to be fired to 900-1000 ℃, grinds into MgO swelling agent, mixes mixing in cement become mass concrete with 4%-5%.
Many scholars think, MgO hydration rate is subject to calcining temperature, grinding granular size and ambient temperature effect larger, are also to control its stable being difficult to of expanding, test shows, mix the sand-cement slurry of 5%MgO, curing temperature is brought up to 40 ℃, 60 ℃, 1-2 times of its expansion stable period shortening from 20 ℃.
Owing to adopting the MgO of specific equipment dead roasting to decompose completely, the perfect crystal densification that reaches full growth of MgO crystal, the hydration rate of its MgO is slower, and its expansion stable period is longer, and therefore, special roasting completely MgO swelling agent still can not be used for industrial civil building.Ministry of Water Resources and Power Industry of China door is applied to the backfill mass concrete of dam batholith plinth, concrete internal temperature 40-60 ℃, continue 3-6 month, be conducive to the aquation process of MgO, expansion stable period is in 180d left and right, himself volumetric expansion 50-100 μ m, reaches the effect of compensation mass concrete shrinkage.
In addition the swelling agent that, contains two kinds of expansion sources is commonly referred to composite expanding agent.The for example CSA swelling agent of Japan, by anhydrous calcium sulphoaluminate C
4a
3 
(20-30%) and free CaO (20%-30%) composition, China CEA swelling agent is made up of with gypsum the high calcium clinker containing 30%-40%f-CaO and alunite, and two expansive cements of Zhejiang University's development are to fill into ettringite and to calcine MgO as two expansion sources.The hydration reaction feature of this kind of swelling agent is to form two kinds of expansion hydrated products, utilizes the difference of two kinds of speed of response, adjusts rate of expansion.F-CaO is at aquation early origin Ca (OH)
2produce and expand; The anhydrous calcium sulphoaluminate also ettringite of aquation formation quickly produces expansion; Alunite
under lime and gypsum activation, the speed of aquation formation ettringite is slower, and expansion mainly occurs in the mid-term of hardening of cement; Special roasting completely MgO aquation becomes Mg (OH)
2the expansion providing is slower.
On the other hand, China's cement production enterprise that has entered low margin age, in fact reduces production costs to add fusion material widely, and adding of a large amount of fusion materials, causes the autogenous volume of silicate cement mud product to shrink significantly increase first; Second cause workability and the bleeding of construction to degenerate, directly cause goods internal stress distribution irregular, aggravated the generation of shrinkage crack, and even occurred a large amount of segmentation cracks.And be to reduce the industrial civil engineering costs such as road building, construction party who be unwilling to spend large price to remove to introduce suitable swelling agent to reduce concrete autogenous volume contraction, be evolved into thus a large amount of roads and construction work and patch up throughout the year, so do not come into operation start repair.
Objective fact is, China has become the first cement big country, also becomes jerry-built project big country, and the autogenous volume of this and now general silicate cement shrinks the excessive much relations that have.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, and the method for the dry-process rotary kiln production microdilatancy early strength silicate cement that a kind of cost is low is provided.
The technical solution adopted for the present invention to solve the technical problems is, a kind of method of dry-process rotary kiln production microdilatancy early strength silicate cement, entering high temperature section area of space in grate-cooler in cooling zone to the kilneye blanking of rotary kiln adds containing magnesian bulk goods, utilize the high temperature chamotte having burnt till to enter in process of cooling, the incomplete roasting of waste heat of high temperature chamotte is containing magnesian bulk goods, obtain the grog that contains light calcined magnesia swelling agent or contain light calcined magnesia and calcium oxide swelling agent simultaneously, all the other are identical with existing general method for producing Portland cement, as add fusion material, gypsum, grinding etc.
Described is that particle diameter is less than 40mm(and is preferably less than 15mm containing magnesian bulk goods, is more preferably less than 12mm) containing at least one in magnesian Wingdale, rhombspar, magnesite, Magnesium Silicate q-agent, magnesite product waste;
The described add-on containing magnesium oxide bulk goods, in Chemical Composition MgO, is the preferred 4-6% of 2-10%(of the high temperature chamotte quality of having burnt till), or in MgO and CaO sum, be the preferred 5-10% of 2.5-20%(of the high temperature chamotte quality of having burnt till).
Adding containing in magnesian bulk goods, can add the material of oxygen-freeization magnesium, as the Wingdale of oxygen-freeization magnesium, hygrometric state slag, gypsum etc.
Beneficial effect of the present invention:
1, on the existing dry cement production line equipment feature of analysis and evaluation and processing parameter basis, do not increase magnesium oxide or calcium oxide roasting apparatus, make full use of existing production line, and do not affect normal production, do not increase hear rate, only utilization has been burnt till grog and has been entered the incomplete calcining expansion agent of high temperature chamotte waste heat in process of cooling, and cement production enterprise is born without investment and Financial cost;
2, the high temperature chamotte waste heat that utilization enters in process of cooling is main roasting bulk goods, while having avoided professional stoving oven calcining light calcined magnesia calcium oxide swelling agent, because magnesium oxide calcium oxide lattice in its thoroughness roasting process has enough heats and time reach full growth and shrink densification, institute causes MgO aquation excessively slow, the quick-fried bamboo shoot of CaO dead roasting, and can not be applied to safely industry and the drawback of civilian road building engineering, utilize the incomplete roasting of grog waste heat can allow cheap light-burned MgO and CaO swelling agent component be adapted to preferably industry and civil building engineering, calcine sufficient MgO and can not produce, the hazardness in the sclerosis later stage that CaO and excessive gypsum cause expands,
3, enter high temperature section area of space in grate-cooler in rotary kiln clinker cooling zone to blanking, the light-burned free MgO, the CaO that produce containing magnesium oxide bulk goods adding is different from 1450 ℃ of high-temperature calcination processes of grog not chemical combination completely and dead roasting crystallization f-CaO and periclasite or secondary degradation production do not affect soundness; Undecomposed part MgCO
3, CaCO
3particle does not affect clinker strength in suitable quantity, and add through the roasting of high temperature chamotte waste heat increased grog ultimate production containing magnesium oxide material, reduced total grog energy consumption.
4, in entering process of cooling, the high temperature chamotte having burnt till adds containing magnesium oxide calcium oxide bulk goods, because decomposing, it needs to absorb amount of heat, be conducive to improve the cooling quality of grog, can improve the grindability of grog, simultaneously, because light-burned MgO, CaO and the undecomposed material grain of part all have good grindability, can effectively improve cement mill output, reduce grinding pow consumption.
5, in clinker cooling process, decompose containing the granular material of magnesia carbonate the light-burned CaO, the MgO that introduce and be both conducive to improve basicity, improve early strength, workability and the bleeding of cement construction can be significantly improved again, and the anti-carbonation properties of cement products (concrete) can be improved.
6, be the mode reducing costs to cement production enterprise in other words in extremely economic mode, microfracture and be full of cracks problem that the intrinsic hydration process autogenous volume shrinkage character of silicate minerals causes are dissolved, more can dissolve because fall the large volume blended material of cost popularization, the excessive autogenous volume causing shrinks caused serious concrete engineering quality problem.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
The every product performance of the following stated detect data, take from the normal detection data in cement production enterprise production, and its primary grog (containing swelling agent grog) is raw materials and fuel and the close primary grog of batching composition control; All product autogenous volumes of producing by the inventive method change to detect and are sampled as the production samples of normal production, and its primary grog and fusion material, gypsum etc. are roughly suitable.
Embodiment 1: certain the Φ 3 × 48m of factory dry-process rotary kiln production line, while adopting existing universal method normally to produce, its (primary) grog standard consistency 22.0-24.4%, presetting periods 84 ＇-138 ＇, average 116 minutes, final setting time 121 ＇-184 ＇, average 157 minutes.3 days average intensity resistance to compression 27.8MPa, anti-folding 4.5MPa, 28 days average intensity resistance to compression 54.3MPa, anti-folding 5.5MPa.This factory's fusion material is cinder, coal ash and slag collocation, and gypsum adopts natural dihydrate gypsum.Its 42.5 class g cement standard consistency 23. 8-25.1%, average 147 minutes of presetting period, average 213 minutes of final setting time, 3 days average intensity resistance to compression 21.6MPa, anti-folding 3.9MPa, 28 days average intensity resistance to compression 47.3MPa, anti-folding 4.6MPa.User reflects that cement workability is poor, many segmentation cracks.
Trial edition inventive method is produced, aluminum phosphate lining alumina-ceramic deflector chute for Yi Nie Chrome steel, the rhombspar of broken particle diameter≤12mm is sent into cooling zone in kiln from kiln hood, rhombspar feed quantity is 13% of primary clinker quantity, count 6.6% of primary clinker quality with (CaO+MgO), the grog standard consistency 22.5-23.8% containing light-burned MgO and CaO producing, presetting periods 91 ＇-127 ＇, average 109 minutes, shorten 7 minutes, final setting time 134 ＇-181 ＇, average 155 minutes, shorten 2 minutes, 3 days average intensity resistance to compression 31.3MPa, anti-folding 4.4MPa, 28 days average resistance to compression 54.7MPa of intensity, anti-folding 5.7MPa, within 3 days, ultimate compression strength on average improves 3.5MPa, anti-folding improves 0.9MPa, within 28 days, intensity there is not variation substantially.In equal fusion material gypsum situation, 42.5 class g cement standard consistency 22.8-24.7%, average 135 minutes of presetting period, average 207 minutes of final setting time, 3 days average intensity resistance to compression 24.8MPa, anti-folding 4.1MPa, within 3 days, ultimate compression strength improves 3.2MPa, and within 28 days, intensity is substantially suitable.User reflects that cement construction workability is obviously good, and bleeding is significantly improved, that a large amount of segmentation crack that has not substantially had original cement to produce.
Get 42.5 class g cements and produce each 6 groups of sample, the results are shown in Table 1 by the autogenous volumetric deformation data statistics of the test method actual measurement of concrete for hydraulic structure testing regulation SD105-82.Presentation of results, original production scheme 42.5 class g cements are shown as shrinkage type, maximum reach-107x10 of autogenous volume shrinkage value
-6.Production decision 42.5 class g cements of the present invention are shown as microdilatancy type (i.e. anti-shrinkage type), and expansion stable period is at about 60-90 days, and maximum autogenous volume swell value is 22 × 10
-6.
case study on implementation 2: certain the Φ 4.3 × 64m of factory dry-process rotary kiln production line, adopts existing universal method normally to produce, its primary grog standard consistency 23.0-25.4%, presetting periods 125 ＇-178 ＇, average 156 minutes, final setting time 191 ＇-234 ＇, average 217 minutes.3 days average intensity resistance to compression 29.1MPa, anti-folding 4.7MPa, 28 days average intensity resistance to compression 56.3MPa, anti-folding 5.8MPa.This factory's fusion material is cinder, coal ash, and gypsum adopts modified ardealite.Its 32.5 class g cement standard consistency 24.8-25.5%, average 187 minutes of presetting period, average 243 minutes of final setting time, 3 days average intensity resistance to compression 15.7MPa, anti-folding 2.9MPa, 28 days average intensity resistance to compression 35.1MPa, anti-folding 3.8MPa.User reflects that cement does not play slurry, bleeding, cracking.
Trial edition invention technological method, the rhombspar of broken particle diameter≤10mm is discharged in grate-cooler from kiln hood grog feed opening, rhombspar is fed amount for 15% of primary clinker quantity, count 7.6% of primary clinker quantity with (CaO+MgO), the grog standard consistency 23.2-24.6% containing light-burned MgO and CaO producing, presetting periods 96 ＇-137 ＇, average 124 minutes, shorten 32 minutes, final setting time 144 ＇-187 ＇, average 165 minutes, shorten 52 minutes, 3 days average intensity resistance to compression 32.3MPa, anti-folding 5.3MPa, 28 days intensity resistance to compression 56.7MPa, anti-folding 5.8MPa, within 3 days, ultimate compression strength on average improves 3.2MPa, anti-folding improves 0.6MPa, within 28 days, intensity there is not variation substantially.In its equal fusion material gypsum situation, 32.5 class g cement standard consistency 24.8-25.6%, average 146 minutes of presetting period, shortening 41 minutes, average 217 minutes of final setting time, shorten 32 minutes, 3 days average intensity resistance to compression 19.8MPa, anti-folding 3.5MPa, 28 days average intensity resistance to compression 36.2MPa, anti-folding 3.9MPa, resistance to compression in 3 days improves 4.2MPa, anti-folding improves 0.6MPa, and within 28 days, intensity slightly increases.User reflects that cement construction workability is obviously good, and bleeding is significantly improved, and cracking phenomena solves substantially.
Get 32.5 class g cements and produce each 6 groups of sample, the results are shown in Table 2 by the autogenous volumetric deformation data statistics of the test method actual measurement of concrete for hydraulic structure testing regulation SD105-82, obviously, original production scheme 32.5 class g cements are shown as shrinkage type, and maximum collapse value reaches-141 × 10
-6, production decision 42.5 class g cements of the present invention are shown as the anti-shrinkage type of microdilatancy, and expansion stable period is at about 60-90 days, and maximum autogenous volume swell value is 22 × 10
-6.
embodiment 3: certain the Φ 3.5 × 50m of factory dry-process rotary kiln production line, while adopting existing universal method normally to produce, primary grog standard consistency 22.1-24.3%, presetting periods 94 ＇-138 ＇, average 116 minutes, final setting time 151 ＇-183 ＇, average 167 minutes.3 days average intensity resistance to compression 28.6MPa, anti-folding 4.5MPa, 28 days average intensity resistance to compression 58.3MPa, anti-folding 6.0MPa.This factory's fusion material is flyash and slag collocation, and gypsum adopts natural dihydrate gypsum.Its 42.5 class g cement standard consistency 23.8-24.7%, average 145 minutes of presetting period, average 211 minutes of final setting time, 3 days average intensity resistance to compression 20.3MPa, anti-folding 3.7MPa, 28 days average intensity resistance to compression 46.4MPa, anti-folding 4.6MPa.User reflects that cement workability is poor, many segmentation cracks easy to crack.
Trial edition inventive method is produced, by the magnesite of broken particle diameter≤10mm from feed opening feeding in kiln head cover, magnesite feed quantity is 9% of primary clinker quantity, count 4.2% of primary clinker quantity with MgO, the grog standard consistency 22.0-23.8% containing light-burned MgO producing, presetting periods 90 ＇-127 ＇, average 110 minutes, shorten 6 minutes, final setting time 144 ＇-181 ＇, average 156 minutes, shorten 11 minutes, 3 days average intensity resistance to compression 31.7MPa, anti-folding 5.1MPa, 28 days intensity resistance to compression 59.1MPa, anti-folding 6.1MPa, within 3 days, ultimate compression strength on average improves 3.1MPa, anti-folding improves 0.6MPa.In its equal fusion material gypsum situation, 42.5 class g cement standard consistency 22.8-24.3%, average 135 minutes of presetting period, average 205 minutes of final setting time, 3 days average intensity resistance to compression 23.8MPa, anti-folding 4.3MPa, 28 days average 47.3MPa of intensity resistance to compression, be anti-ly folded flat equal 4.9MPa.Within 3 days, ultimate compression strength on average improves 3.5MPa, anti-folding raising 0.6MPa, within 28 days, is slightly improved.User reflects that cement construction workability is good, and bleeding is obviously improved, and problem of Cracking solves substantially, can't see that a large amount of segmentation crack that original cement produces.
Get 42.5 class g cements and produce each 6 groups of sample, the results are shown in Table 3 by the autogenous volumetric deformation data statistics of the test method actual measurement of concrete for hydraulic structure testing regulation SD105-82, original production scheme 42.5 class g cements are shown as shrinkage type, and maximum collapse value reaches-137 × 10
-6, production decision 42.5 class g cements of the present invention are shown as microdilatancy type (i.e. anti-shrinkage type), and expansion stable period is at about 60-90 days, and maximum autogenous volume swell value is 21 × 10
-6.
Embodiment 4: certain the Φ 4.8 × 72m of factory dry-process rotary kiln production line, while adopting existing universal method normally to produce, primary grog standard consistency 22.3-24.1%, presetting periods 86 ＇-128 ＇, average 112 minutes, final setting time 142 ＇-184 ＇, average 167 minutes.3 days average intensity resistance to compression 31.7MPa, anti-folding 4.7MPa, 28 days average intensity resistance to compression 57.6MPa, anti-folding 5.9MPa.This factory's fusion material is flyash and silica collocation, and gypsum adopts desulfurated plaster.Its 42.5 class g cement standard consistency 22..8-24.1%, average 143 minutes of presetting period, average 193 minutes of final setting time, 3 days average intensity resistance to compression 25.6MPa, anti-folding 3.9MPa, 28 days average intensity resistance to compression 48.3MPa, anti-folding 4.9MPa.User reflects that cement workability is poor, many segmentation cracks.
Trial edition invention technological method is produced, send into from kiln hood feed opening by the magnesite of broken particle diameter≤12mm with containing magnesite lime stone, magnesite and Wingdale are fed amount for 15% of primary clinker quantity, be about 8.5% of primary clinker quantity in (CaO+MgO), the grog standard consistency 22.1-24.0% containing light-burned MgO and CaO producing, presetting periods 87 ＇-127 ＇, average 109 minutes, shorten in average 3 minutes, final setting time 135 ＇-182 ＇, average 155 minutes, shorten 12 minutes, 3 days average intensity resistance to compression 34.8MPa, anti-folding 5.4MPa, 28 days intensity resistance to compression 58.7MPa, anti-folding 6.1MPa, within 3 days, ultimate compression strength on average improves 3.1MPa, anti-folding improves 0.7MPa, within 28 days, intensity slightly increases.In its equal fusion material gypsum situation, 42.5 class g cement standard consistency 22.8-24.5%, average 136 minutes of presetting period, average 183 minutes of final setting time, 3 days average intensity resistance to compression 27.8MPa, anti-folding 3.9MPa, 28 days average intensity resistance to compression 48.6MPa, anti-folding 4.9MPa, early improve by force 2.2MPa, 28 days quite.User reflects that cement construction workability is obviously good, and bleeding is improved, and substantially can't see that a large amount of segmentation crack that original cement produces.
Get 42.5 class g cements and produce each 6 groups of sample, the results are shown in Table 4 by the autogenous volumetric deformation data statistics of the test method actual measurement of concrete for hydraulic structure testing regulation SD105-82, original production scheme 42.5 class g cements are shown as shrinkage type.Maximum collapse value reaches-107 × 10
-6, production decision 42.5 class g cements of the present invention are shown as microdilatancy type (i.e. anti-shrinkage type), and expansion stable period is at about 60-90 days, and maximum autogenous volume swell value is 22 × 10
-6.
embodiment 5: certain the Φ 3 × 47m of factory dry-process rotary kiln production line, adopts existing universal method normally to produce, primary grog standard consistency 23.0-24.5%, presetting periods 133 ＇-168 ＇, average 146 minutes, final setting time 181 ＇-224 ＇, average 207 minutes.3 days average intensity resistance to compression 27.8MPa, anti-folding 4.5MPa, 28 days average intensity resistance to compression 57.3MPa, anti-folding 5.5MPa.This factory's fusion material is cinder, coal ash, and gypsum adopts natural dihydrate gypsum.Its 32.5 class g cement standard consistency 24..8-25.7%, average 167 minutes of presetting period, average 223 minutes of final setting time, 3 days average intensity resistance to compression 15.3MPa, anti-folding 2.9MPa, 28 days average intensity resistance to compression 35.1MPa, anti-folding 3.7MPa.User reflects that cement does not play slurry, bleeding, easy to crack, many segmentation cracks.
Trial edition inventive method, by broken particle diameter≤12mm, the high magnesium lime stone of content of magnesia average 5.7% is sent into from kiln head cover feed opening, high magnesium lime stone feed quantity is primary clinker quantity 15%, count 8.2% of primary clinker quantity with (CaO+MgO), the grog standard consistency 23.5-24.5% containing light-burned MgO and CaO producing, presetting periods 97 ＇-127 ＇, average 121 minutes, shorten 25 minutes, final setting time 154 ＇-187 ＇, average 171 minutes, shorten 36 minutes, 3 days average intensity resistance to compression 32.3MPa, anti-folding 5.1MPa, 28 days intensity resistance to compression 58.7MPa, anti-folding 5.9MPa, within 3 days, ultimate compression strength on average improves 4.5MPa, anti-folding improves 0.6MPa, within 28 days, intensity is slightly improved.In its equal fusion material gypsum situation, 32.5 class g cement standard consistency 24.1-25.6%, average 145 minutes of presetting period, average 207 minutes of final setting time, 3 days average intensity resistance to compression 18.7MPa, anti-folding 3.1MPa, 28 days average resistance to compression 36.1MPa of intensity, anti-folding 3.9MPa.User reflects that cement construction workability is obviously good, and bleeding is significantly improved, and substantially can't see that a large amount of segmentation crack that original cement produces.
Get 32.5 class g cements and produce each 6 groups of sample, the results are shown in Table 5 by the autogenous volumetric deformation data statistics of the test method actual measurement of concrete for hydraulic structure testing regulation SD105-82, original production scheme 32.5 class g cements are shown as shrinkage type, and maximum collapse value reaches-137 × 10
-6, production decision 32.5 class g cements of the present invention are shown as microdilatancy type (anti-shrinkage type), and expansion stable period is about 60 days, and maximum autogenous volume swell value is 7.2 × 10
-6.
Claims (5)
1. the method for a dry-process rotary kiln production microdilatancy early strength silicate cement, it is characterized in that, entering high temperature section area of space in grate-cooler in cooling zone to the kilneye blanking of rotary kiln adds containing magnesian bulk goods, utilize the high temperature chamotte having burnt till to enter in process of cooling, the incomplete roasting of waste heat of high temperature chamotte, containing magnesian bulk goods, obtains the grog that contains light calcined magnesia swelling agent or contain light calcined magnesia and calcium oxide swelling agent simultaneously;
Described is at least one in magnesian Wingdale, rhombspar, magnesite, Magnesium Silicate q-agent, magnesite product waste that contain that particle diameter is less than 40mm containing magnesian bulk goods;
The described add-on containing magnesian bulk goods, in Chemical Composition MgO, is the 2-10% of the high temperature chamotte quality of having burnt till, or in MgO and CaO sum, is the 2.5-20% of the high temperature chamotte quality of having burnt till.
2. the method for dry-process rotary kiln production microdilatancy early strength silicate cement according to claim 1, is characterized in that, the described particle diameter containing magnesian bulk goods is less than 15mm.
3. the method for dry-process rotary kiln production microdilatancy early strength silicate cement according to claim 2, is characterized in that, is describedly less than 12mm containing magnesian bulk goods particle diameter.
4. the method for dry-process rotary kiln production microdilatancy early strength silicate cement according to claim 1 and 2, it is characterized in that, the described add-on containing magnesian bulk goods, in Chemical Composition MgO, for the 4-6% of the high temperature chamotte quality of having burnt till, or in MgO and CaO sum, be the 5-10% of the high temperature chamotte quality of having burnt till.
5. the method for dry-process rotary kiln production microdilatancy early strength silicate cement according to claim 1 and 2, is characterized in that, in adding containing magnesium oxide bulk goods, also adds material Wingdale, hygrometric state slag and the gypsum of oxygen-freeization magnesium.
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