CN1060643A - Add the technology of crystal seed raising cement kiln calcining efficacy - Google Patents
Add the technology of crystal seed raising cement kiln calcining efficacy Download PDFInfo
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- CN1060643A CN1060643A CN90108199A CN90108199A CN1060643A CN 1060643 A CN1060643 A CN 1060643A CN 90108199 A CN90108199 A CN 90108199A CN 90108199 A CN90108199 A CN 90108199A CN 1060643 A CN1060643 A CN 1060643A
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Abstract
A kind of technology of adding crystal seed raising cement kiln calcining efficacy, mainly be in existing cement calcinating process, to make crystal seed with the mineral of cement clinker, silicate cement finished product or synthetic (as tricalcium silicate etc.), through mix behind the independent grinding in the levigated raw material powder mixing go into kiln or go into the raw mill bistrique levigate together and go into the kiln calcining with raw material with raw material, thereby reach the effect that improves cement burning usefulness.The addition of crystal seed is 3～10% of a raw material consumption.
Description
A kind of technology of adding crystal seed raising cement kiln calcining efficacy belongs to the cement calcinating process field, is used to improve the calcining efficacy of cement kiln.
No matter the calcining of Portland clinker is to make calciner with rotary kiln or shaft kiln, all will experience physical-chemical reaction process such as drying and dehydrating, carbonate decomposition, solid state reaction, grog burn till, grog cooling.The weakest link that influences the cement kiln calcining efficacy performance is exactly the carbonate decomposition band, because the heat absorption of carbonate decomposition accounts for nearly 50% of theory caloric receptivity that grog forms, next is exactly the grog clinkering zone, burning till in 1300-1450-1300 ℃ temperature range of grog, carry out existing under the condition of 25～30% high-temperature fusant, though institute's heat requirement is very few, but comprising a series of physical and chemical processes such as dissolving, diffusion, crystallization and crystal growth, both interacted between them, condition each other again, and reach running balance under certain condition.
The cement kiln external decomposition technology that the seventies comes out has been opened up new era of manufacture of cement, carbonate decomposition is moved on to kiln carry out outward, has alleviated the thermal load of cement kiln greatly, makes rotary kiln output be increased (with the contrast of same specification kiln).If but can further quicken clinker maturing reaction from technological approaches, and shorten the clinkering zone of kiln, then can more effectively bring into play the calcining efficacy of cement kiln.
Introducing fusing assistant and mineralizer in the clinker burning process is to quicken the valid approach that grog forms, research and practice all show, adopt fluorochemical and vitriol composite mineralizer more effective, but owing to adopt the accuracy of homogeneity that composite mineralizer has relatively high expectations-prepare burden batching on the one hand and mineralizer component incorporation all strict, and because the introducing of mineralizer component causes the instability of cement setting performance, the generation that has is coagulated soon, what have slow setting then occurs, has influenced it and has applied and effect.
In China, exist in the Vertical Kiln for Cement Production that has a large capacity and a wide range one distinct issues are exactly that free calcium oxide (f-Cao) is higher in the grog, clinker quality is inhomogeneous, cement quality is unstable, trace it to its cause, mainly be ventilation in the clinker burning process uneven and get angry irregular due to, so the weak link of shaft kiln calcination is mainly at the grog clinkering zone.
Relevant interpolation crystal seed is not seen the data at home and abroad report as yet to silicate cement and to the influence of cement kiln calcining efficacy.
The objective of the invention is to seek a technological approaches that quickens clinker maturing reaction, increase the output of kiln, cut down the consumption of energy, improve clinker quality and stability thereof for improving the calcining efficacy of existing cement kiln.
Make crystallization under non-homogeneous state, carry out to reduce the coring potential barrier significantly according to adding crystal seed (also claiming nucleating agent), improve crystallization rate, especially the basic physical and chemical principle of its best results when crystal seed and nucleus have similar atomic arrangement, we propose to add a small amount of needed mineral as crystal seed in the clinker burning process, form to quicken clinker mineral, improve the new technical conceive of cement kiln calcining efficacy.In actual the enforcement, both can introduce and make crystal seed with the required class gel mineral of artificial synthetic (as tricalcium silicate etc.), the also available Portland clinker that has burnt till is made crystal seed, that is: the part of kiln discharge grog as crystal seed, it is levigate together with raw material to return the raw mill bistrique by a certain percentage, and go into kiln with raw material and calcine, circulation so repeatedly constitutes the closed circuit calcining of part of cement kiln.Certainly, extremely big to identical fineness with the raw material powder as the independent grinding of the grog of crystal seed, mix by a certain percentage in the levigate raw material powder and, perhaps in levigate raw material powder, add a certain amount of silicate cement finished product, also can play same effect through the blending device mixing through the blending device mixing.The addition of crystal seed is 3～10% of a raw material consumption.
Add the ultimate principle of crystal seed raising crystallization rate, in the production technique of general crystal growth and devitrified glass, successfully adopted, but for the action effect that the Portland clinker of liquid phase under the firing temperature less (25～30%) forms, then never the someone relates to.And above-mentioned interpolation part grog is made crystal seed, quickening the new design of grog formation is at first verified by our laboratory result, laboratory test is taked in raw material to add part and has been burnt till grog and make crystal seed, when in experimental electric furnace, having tested under different calcining temperatures and the high temperature different soaking times calcining, add the influence that crystal seed forms grog, test grog and make by same raw material as the grog of crystal seed, its chemical ingredients is as shown in table 1, and test-results is as shown in table 2.
Table 1 grog chemical ingredients and rate value
| Numbering | Chemical ingredients (%) | The rate value | ||||||
| Sio 3 | Al 2O 3 | Fe 2O 3 | CaO | MgO | KH | n | p | |
| Z-1 | 21.16 | 5.99 | 4.88 | 65.56 | 1.07 | 0.913 | 2.02 | 1.34 |
By table 2 as seen, the grog that the interpolation part has been burnt till in the raw material is made crystal seed and can be promoted grog to form significantly, improves the burn-ability of raw material, and calcining effect at a lower temperature is apparent especially.It is suitable to mix the effect of 5% grog when 30 minutes effect of 1400 ℃ of insulations was not almost mixed crystal seed in 30 minutes with 1450 ℃ of insulations, adds crystal seed when calcining and can make soaking time shorten about 20 minutes under uniform temp.
According to above-mentioned laboratory result, add the part grog in the raw material and be to shorten crystal nucleation time in the clinker mineral forming process as the action effect of crystal seed, quickened crystallization rate, thereby constantly break the running balance between the branch processes such as dissolving in the grog sintering process, diffusion, crystallization, and play the effect that grog burns till of quickening.Therefore, for rotary kiln, the effect of adding crystal seed mainly shows the output that can further improve kiln, and for shaft kiln, because the introducing of crystal seed can make the grog firing temperature reduce and can quicken the formation of clinker mineral greatly, thereby the uneven problem of clinker quality that causes for the ventilation inequality that solves because of shaft kiln has its special effect.
For further verifying the feasibility of this new technical conceive, we had once carried out three days type approval test by a definite date on the short and thick shaft kiln of cement mill, Lingshan County, Guangxi φ 2.5 * 7M.Test work is carried out under having ready conditions in that this factory is former, as the grog of crystal seed temporarily by manually adding (crystal seed add-on be raw material 5～8%) from the raw material bistrique.The contrast of raw material chemical ingredients sees Table 3, and test effect sees Table 4, and three days grog physical and mechanical property sees Table 5 before and after the test.
Raw material chemical ingredients contrast before and after table 3 test
| Chemical ingredients (%) | The rate value | ||||||||
| Loss on ignition | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | KgO | KH | n | p | |
| Before the test | 38.04 | 12.24 | 3.52 | 2.62 | 39.62 | 1.47 | 0.960 | 1.99 | 1.34 |
| After the test | 37.84 | 12.51 | 3.57 | 2.58 | 39.19 | 1.51 | 0.925 | 2.03 | 1.38 |
Table 4 commercial test result
| The loss on ignition of grog (%) | F-CaO in the grog (%) | The unit-hour output of kiln (ton/time) | |
| Before the test | 1.00～1.97 | 3.00～4.71 | 4.10 |
| After the test | 0.05～0.55 | 2.12～2.72 | 4.80 |
As seen from Table 4, behind the interpolation grog crystal seed, the loss on ignition of kiln discharge grog reduces to 0.05～0.55% by 1.00～1.97%, and the free calcium oxide content of grog also reduces more than 1.00%, has promoted the formation of grog significantly.In addition, the unit-hour output of kiln is increased to 4.80 tons/hour by 4.10% ton/hour, and volume increase 17% is not difficult to find out, a part of grog that is used as crystal seed not only can be regained by the unit-hour output that improves kiln fully, but also the leeway of volume increase is arranged greatly.From the data of table 5, behind the interpolation crystal seed, clinker quality significantly improves on the whole in addition, and compressive strength improved 3～7MPa in 28 days, can be stabilized in more than the 57MPa.And in force, operation from the kiln, when not adding crystal seed, it is comparatively passive to operate, but in the tests in several days of adding crystal seed, favourable turn has taken place in situation, kiln ventilation is improved, and the speed of getting angry of limit, moderate heat is tending towards evenly, and discharging also can be accomplished to stablize, the quality of kiln discharge grog is all neat, this further assurance of being improved by a relatively large margin on the whole of clinker quality just.
From this specific embodiment, the present invention has significantly complex art economic benefit to improving cement kiln calcining efficacy.
The present invention has following characteristics and advantage:
1. on rotary kiln, adopt, can further improve the output of kiln;
2. on shaft kiln, adopt, except that the output that increases kiln, the more important thing is and to improve clinker quality and homogeneity thereof;
3. adopt present technique to have less investment, last detective, characteristics easy to implement on the technology.
Claims (2)
1, a kind ofly adds the technology that crystal seed improves cement kiln calcining efficacy, it is characterized in that adding a certain amount of crystal seed in the calcination process of cement clinker, thereby improve the calcining efficacy of cement kiln.
2, improve the technology of cement kiln calcining efficacy according to the interpolation crystal seed described in the claim 1, it is characterized in that:
(1) both good cement clinker or silicate cement finished products of calcining of the crystal seed of Tian Jiaing, the also required class gel mineral of synthetic (as tricalcium silicate etc.);
(2) interpolation of crystal seed had both been mixed in the levigated raw material powder mixing separately behind the grinding and had been gone into kiln, and it is levigate together with raw material also can to go into the raw mill bistrique, and went into kiln with raw material;
(3) addition of crystal seed is 3～10% of a raw material consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90108199A CN1023557C (en) | 1990-10-13 | 1990-10-13 | Cement kiln calcining efficacy-improved technology by adding seed crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90108199A CN1023557C (en) | 1990-10-13 | 1990-10-13 | Cement kiln calcining efficacy-improved technology by adding seed crystal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1060643A true CN1060643A (en) | 1992-04-29 |
| CN1023557C CN1023557C (en) | 1994-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN90108199A Expired - Fee Related CN1023557C (en) | 1990-10-13 | 1990-10-13 | Cement kiln calcining efficacy-improved technology by adding seed crystal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529200A (en) * | 2015-01-22 | 2015-04-22 | 李光荣 | Superfine high-temperature-resistant cement and preparation method thereof |
| CN106630707A (en) * | 2016-12-01 | 2017-05-10 | 济南大学 | Method for inducing firing of sulphoaluminate clinker by using silicate clinker |
| CN115108740A (en) * | 2022-05-23 | 2022-09-27 | 临沂中联水泥有限公司 | Cement clinker for treating polluted soil of coking plant |
| CN117209178A (en) * | 2023-08-03 | 2023-12-12 | 龙岩市鑫全鸿建材科技有限公司 | Energy-saving additive for non-clinker composite seed crystal of rotary kiln calcined cement and use method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047373C (en) * | 1995-08-14 | 1999-12-15 | 中国科学院 | One furnace two purpose simultaneously concurrent heat and cement clinker producing method, equipment and product |
| CN1143054A (en) * | 1995-08-14 | 1997-02-19 | 中国科学院 | Method, product and equipment for simultanously outputing heat and producing cement chamotte for |
-
1990
- 1990-10-13 CN CN90108199A patent/CN1023557C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529200A (en) * | 2015-01-22 | 2015-04-22 | 李光荣 | Superfine high-temperature-resistant cement and preparation method thereof |
| CN106630707A (en) * | 2016-12-01 | 2017-05-10 | 济南大学 | Method for inducing firing of sulphoaluminate clinker by using silicate clinker |
| CN106630707B (en) * | 2016-12-01 | 2018-11-09 | 济南大学 | A method of it is burnt into using portland cement clinker induction sulfoaluminate clinker |
| CN115108740A (en) * | 2022-05-23 | 2022-09-27 | 临沂中联水泥有限公司 | Cement clinker for treating polluted soil of coking plant |
| CN117209178A (en) * | 2023-08-03 | 2023-12-12 | 龙岩市鑫全鸿建材科技有限公司 | Energy-saving additive for non-clinker composite seed crystal of rotary kiln calcined cement and use method thereof |
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| Publication number | Publication date |
|---|---|
| CN1023557C (en) | 1994-01-19 |
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