CN102936103A - Cement clinker fired by construction waste serving as raw material component and firing process thereof - Google Patents
Cement clinker fired by construction waste serving as raw material component and firing process thereof Download PDFInfo
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- CN102936103A CN102936103A CN2012104446050A CN201210444605A CN102936103A CN 102936103 A CN102936103 A CN 102936103A CN 2012104446050 A CN2012104446050 A CN 2012104446050A CN 201210444605 A CN201210444605 A CN 201210444605A CN 102936103 A CN102936103 A CN 102936103A
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- building waste
- cement clinker
- construction waste
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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
A cement clinker fired by construction waste serving as a raw material component is prepared by raw materials, by weight, of 74-78% of limestone, 2-3% of coal ash, 6-7% of sulphur residue, 2-3% of silica powder sludge and 12-13% of construction waste. A process for firing cement clinker fired by the construction waste serving as the raw material component comprises the following operation steps of smashing the construction waste through a crusher, conveying the smashed construction waste to an outer storage yard of the raw materials, distributing in a rectangular pre-homogenizing storage yard through a stacker in a paving mode, and then adopting a vertical cross section material taking mode to convey the materials to a reserved bin; and directly metering the construction waste after layer-and-layer pre-homogenization to place in a raw mill for milling according to proportion through a metering device, enabling raw meal end products to enter a raw meal homogenizing silo, and using a homogenization silo bottom to meter conveying equipment to enter a predecomposition kiln system. By means of pre-decomposition of the materials, the decomposition rate of in-kiln materials achieves higher than 90%, and the in-kiln materials are burnt at the temperature of 1400-1450 DEG C.
Description
Technical field
The present invention relates to a kind of cement clinker and production technique thereof, relate in particular to a kind of cement clinker and sintering technology thereof that utilizes building waste to fire as feed composition.
Background technology
In urbanization process, increased the burden of urban development as the building waste of city metabolism product, allow a lot of cities, the whole world that the situation in building waste besieged city was arranged.Since the nineties in 20th century, the numerous countries in the world particularly developed country will process one of target that building waste pursues as national environmental protection and the strategy of sustainable development.China starts late to the processing of building waste, at present, processes both at home and abroad that building waste is mainly taked landfill, the processing mode such as pave the way, and processing mode is single, and consumption is very little, can not fundamentally solve the difficult problem of building waste cycling and reutilization.
Summary of the invention
The purpose of this invention is to provide a kind of cement clinker and sintering technology thereof that utilizes building waste to fire as feed composition.
For achieving the above object, the technical solution used in the present invention is:
A kind of cement clinker that utilizes building waste to fire as feed composition is characterized in that, it is made by the raw material of following weight percent: Wingdale 74-78%, flyash 2-3%, sulphur slag 6-7%, silica flour mud 2-3%, building waste 12-13%.
A kind of building waste that utilizes is as the technique of feed composition calcining cement clinker, it is characterized in that, comprise following operation steps: first building waste is pulverized by crusher, then stockyard outside transport trolley is transported to starting material, be distributed into the rectangle pre-homogenization yard by stacker by " tiling " mode, then take the mode of vertical section feeding to be delivered in the storehouse for subsequent use by reclaimer; Building waste is through directly being metered to the raw mill grinding by metering outfit according to proportioning claimed in claim 1 after the pre-homogenizing layer by layer, the raw material finished product enters raw material homogenizing silo, and then enter in the nsp kiln system through the homogenizing silo bottom metering conveyor, predecomposition by material, making it enter kiln material rate of decomposition reaches more than 90%, the material that enters kiln is calcined between 1400-1450 ℃, after a series of physical-chemical reaction occurs, generate Portland clinker, the kiln discharge cement clinker enters clinker warehouse after the grate-cooler cooling.
The present invention provides a new way to the reasonable utilization of building waste, utilize the characteristic of New Type Dry-process Cement Production, the materials such as building waste can part replace lime stone in feed composition, clayey, high-temperature calcination in nsp kiln can access the Portland clinker of high-quality.Not only quality product is more excellent, and the unit coal consumption descends especially obvious.This is effectively to solve the difficult problem that present building waste is processed, and for building waste minimizing, stabilization, innoxious, resource utilization ultimate disposal provide a brand-new pattern, a new road has been opened up in the popularization of National urban environment optimization and recycling economy.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments:
Embodiment one:
A kind of cement clinker that utilizes building waste to fire as feed composition, it is made by the raw material of following weight percent: Wingdale 74%, flyash 3%, sulphur slag 7%, silica flour mud 3%, building waste 13%.
A kind of building waste that utilizes is as the technique of feed composition calcining cement clinker, as shown in Figure 1, comprise following operation steps: first building waste is pulverized by crusher, then stockyard outside transport trolley is transported to starting material, be distributed into the rectangle pre-homogenization yard by stacker by " tiling " mode, then take the mode of vertical section feeding to be delivered in the storehouse for subsequent use by reclaimer; Building waste is through directly being metered to the raw mill grinding by metering outfit according to proportioning after the pre-homogenizing layer by layer, the raw material finished product enters raw material homogenizing silo, and then enter in the nsp kiln system through the homogenizing silo bottom metering conveyor, predecomposition by material, make it enter kiln material rate of decomposition and reach more than 90%, the material that enters kiln is calcined between 1400-1450 ℃, a series of physical-chemical reaction occurs after, generate Portland clinker, the kiln discharge cement clinker enters clinker warehouse after the grate-cooler cooling.
Embodiment two:
A kind of cement clinker that utilizes building waste to fire as feed composition, it is made by the raw material of following weight percent: Wingdale 75%, flyash 3%, sulphur slag 7%, silica flour mud 3%, building waste 12%.
Sintering technology is with embodiment one.
Embodiment three:
A kind of cement clinker that utilizes building waste to fire as feed composition, it is made by the raw material of following weight percent: Wingdale 76%, flyash 3%, sulphur slag 7%, silica flour mud 2%, building waste 12%.
Sintering technology is with embodiment one.
Embodiment four:
A kind of cement clinker that utilizes building waste to fire as feed composition, it is made by the raw material of following weight percent: Wingdale 77%, flyash 3%, sulphur slag 6%, silica flour mud 2%, building waste 12%.
Sintering technology is with embodiment one.
Embodiment five:
A kind of cement clinker that utilizes building waste to fire as feed composition, it is made by the raw material of following weight percent: Wingdale 78%, flyash 2%, sulphur slag 6%, silica flour mud 2%, building waste 12%.
Sintering technology is with embodiment one.
Embodiment recited above is described preferred implementation of the present invention; be not that the spirit and scope of the present invention are limited; under the prerequisite that does not break away from design concept of the present invention; common engineering technical personnel make technical scheme of the present invention in this area various modification and improvement; all should fall into protection scope of the present invention; the technology contents that the present invention asks for protection all is documented in claims.
The building waste that the present invention will contain the compositions such as calcium, silicon, aluminium, iron is applied in the raw meal proportioning as starting material, has greatly reduced the content of respective components, does not affect again the calcining of cement clinker.So both can reduce the demand of Wingdale, flyash, adopting iron ore tailings, reduce the purchase cost of producing, again can environmental contamination reduction.
Building waste is the solid waste that produces in the construction, maintenance, demolishing process at buildings, mainly comprises the mortar that is scattered in discarded concrete, discarded brick and tile, discarded bituminous concrete and the construction and concrete etc., and complicated component is unbalanced.For not affecting the batching of feed composition, must carry out first pre-homogenizing to the building waste that enters factory and process, the homogenizing of building waste can adopt rectangle raw material prehomogenization stockyard to carry out.
Building waste adopts crusher broken in advance before entering factory, regulation particle size after cracking≤25mm, and the building waste after the pulverizing is convenient to transportation and homogenizing, can directly be transported to the outer stockyard of building waste with transport trolley and stack.The complete building waste of precrushing carries out operation by the stacker that is equipped with in the homogenizing stockyard and reclaimer, can satisfy pre-homogenizing demand and the production supply demand of building waste fully.
By the building waste that the windrow conveyor drive ships, be discharged on the conveyor drive on the stacker cantilever, stacker walk, and meanwhile with material unload show up in, form the capable stockpile of herringbone of layering, so just finished for the first time mixing and processed.Stacker begins full section feeding by reclaimer in the middle of the stock ground after material has been piled up in the stock ground, be discharged on the feeding conveyor, finishes the mixing second time of material.Send into again vertical homogenizing of three phases storehouse for subsequent use through the building waste recycling rotary conveyor that reclaimer is obtained.Whole process has been finished the pre-homogenizing of building waste.Stacker, reclaimer adopt advanced middle control automatic control technology operation, on the operator's console of Central Control Room, can realize to stacker startup or the parking of machine system by pressing button.
Building waste composition through abundant homogenizing is comparatively stable, can satisfy the requirement of raw meal proportioning technique, and the comprehensively sampling analysis is carried out in the building waste classification after the homogenizing, and chemical ingredients wherein is as shown in table 1.
Table 1 building waste chemical component table (% of unit)
As can be seen from Table 1, building waste can provide cement clinker to produce necessary four kinds of compounds, and through the repetition test demonstration, a certain amount of building waste of admixture can be realized taking full advantage of building waste on the basis of original batching.The grog three ratio target control value of at present existing technique batching is KH=0.90 ± 0.02, N=2.9 ± 0.1, P=1.6 ± 0.1.The raw material processing compound before the admixture building waste is not as shown in table 2.
Table 2 is the front former processing compound table (% of unit) of admixture building waste not
| Project | LOSS | SiO 2 | AL 2O 3 | Fe 2O 3 | CaO | MgO | Proportioning |
| Wingdale | 42.15 | 2.62 | 1.05 | 0.55 | 50.22 | 2.69 | 84.0 |
| Flyash | 3.75 | 55.54 | 24.69 | 5.87 | 4.97 | 1.65 | 6.4 |
| Sulfate slag | 5.96 | 21.40 | 5.38 | 58.14 | 5.55 | 1.68 | 2.2 |
| Silica flour mud | 0.88 | 92.81 | 1.81 | 1.96 | 1.21 | 0.45 | 7.4 |
For reaching the grog three ratio target control value of setting, pass through charge calculation, behind the admixture building waste, actual feed composition proportioning is Wingdale 74.7%, flyash 2.9%, sulphur slag 7%, silica flour mud 2.4%, building waste 13%, and total analysis numerical value is as shown in table 3.
Processing compound table behind the table 3 admixture building waste (% of unit)
Contrast table 2 and table 3 as can be known, mix building waste after, other raw material ratio all descends to some extent, realized the purpose of building waste Partial Replacement Wingdale, clayey class material.
During production, there are the raw material of building waste to be applied to 5000D/T new dry process nsp kiln admixture, in 1400-1450 ℃ high temperature, calcine.Because the building waste moisture content is low, material is few at drying and dehydrating stage absorbing heat.In the calcination process of cement clinker, the part that heat dissipation is maximum is raw material CaCO
3Decomposition, account for 45% of whole caloric receptivity, and in building waste some concrete water clod, albarium through pyrolytic decomposition, its carbonate exists with the form of CaO, this part calcium substance need not pass through this one-phase of thermal endothermic decomposition again, so can reduce a large amount of minutes heat of desorptions required use coal, but also the quantity discharged of minimizing carbonic acid gas plays a role in energy saving.In addition, the concrete water clod in the building waste is a kind of grog crystal seed, behind the introduction raw material, in clinker burning, play the effect of induced crystallization, can obviously improve the burn-ability of raw material, reduce liquid phase and generate temperature and liquid phase viscosity, accelerate the formation of portland cement clinker mineral, promote C
2S is to the absorption of free ca.The raw material that are mixed with building waste finally form Portland clinker behind the complicated physical-chemical reaction of the sintering of the decomposition of super-dry and dehydration, carbonate, solid state reaction, grog and cooling, kiln discharge enters clinker warehouse and collects.
By analyzing to cement clinker hydrated sample XRD analysis before and after the admixture building waste batching, scanning electron microscope analysis and to the cement clinker lithofacies structure, observed result shows, under the calcining temperature of regulation, the cement clinker of admixture building waste production is identical with the mineral composition of the cement clinker control sample that conventional raw material burn till, essential mineral pattern in the cement clinker is clear, crystal development is perfect, and the microtexture of sample 3d, 28d hydrated product is also basic identical with control sample.The f-CaO content of each assembly material scheme gained cement clinker is all below 1.5%, the raw material of this explanation preparation take building waste as feed composition have preferably burn-ability, standard consistency water requirement and the time of coagulation of cement clinker are normal, stability is good, and its quality product after testing indices is all qualified.
The present invention adopts building waste to produce the usage quantity that cement clinker has reduced Wingdale, alleviated the exploitation dynamics to the limestone mine resource, saved simultaneously pulverized coal consumption, reduced the quantity discharged of carbonic acid gas, consider from long-term interest, production cost has not only been saved in this measure, also has the effect of energy-saving and emission-reduction.
Claims (2)
1. a cement clinker that utilizes building waste to fire as feed composition is characterized in that, it is made by the raw material of following weight percent: Wingdale 74-78%, flyash 2-3%, sulphur slag 6-7%, silica flour mud 2-3%, building waste 12-13%.
2. one kind is utilized building waste as the technique of feed composition calcining cement clinker, it is characterized in that, comprise following operation steps: first building waste is pulverized by crusher, then stockyard outside transport trolley is transported to starting material, be distributed into the rectangle pre-homogenization yard by stacker by " tiling " mode, then take the mode of vertical section feeding to be delivered in the storehouse for subsequent use by reclaimer;
Building waste is through directly being metered to the raw mill grinding by metering outfit according to proportioning claimed in claim 1 after the pre-homogenizing layer by layer, the raw material finished product enters raw material homogenizing silo, and then enter in the nsp kiln system through the homogenizing silo bottom metering conveyor, predecomposition by material, making it enter kiln material rate of decomposition reaches more than 90%, the material that enters kiln is calcined between 1400-1450 ℃, after a series of physical-chemical reaction occurs, generate Portland clinker, the kiln discharge cement clinker enters clinker warehouse after the grate-cooler cooling.
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| CN2012104446050A CN102936103A (en) | 2012-11-09 | 2012-11-09 | Cement clinker fired by construction waste serving as raw material component and firing process thereof |
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| CN2012104446050A CN102936103A (en) | 2012-11-09 | 2012-11-09 | Cement clinker fired by construction waste serving as raw material component and firing process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007420A (en) * | 2016-05-23 | 2016-10-12 | 许昌金科资源再生股份有限公司 | Cement produced by using waste sintered brick powder as raw material, and preparation method of cement |
| CN110293117A (en) * | 2019-08-09 | 2019-10-01 | 黄石市四棵水泥厂 | The recycling and reusing device and technology of a kind of industrial solid waste in rotary kiln |
| CN110862236A (en) * | 2019-11-25 | 2020-03-06 | 鄂尔多斯市君正能源化工有限公司 | Cement clinker and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299787A (en) * | 1999-12-13 | 2001-06-20 | 潘光华 | Mixed material for cement production |
| CN101468887A (en) * | 2007-12-28 | 2009-07-01 | 天津市大钧科技开发有限公司 | High-temperature calcination technology for 5-10% chromic slag, 5-10% chromium-containing clay, 10-20% fly ash, 20-30% construction garbage and 30-35% limestone cement clinker under 1350 DEG C +/- 100 |
| CN102690069A (en) * | 2011-03-21 | 2012-09-26 | 王晓薇 | Regeneration method taking construction wastes as cement raw materials |
-
2012
- 2012-11-09 CN CN2012104446050A patent/CN102936103A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299787A (en) * | 1999-12-13 | 2001-06-20 | 潘光华 | Mixed material for cement production |
| CN101468887A (en) * | 2007-12-28 | 2009-07-01 | 天津市大钧科技开发有限公司 | High-temperature calcination technology for 5-10% chromic slag, 5-10% chromium-containing clay, 10-20% fly ash, 20-30% construction garbage and 30-35% limestone cement clinker under 1350 DEG C +/- 100 |
| CN102690069A (en) * | 2011-03-21 | 2012-09-26 | 王晓薇 | Regeneration method taking construction wastes as cement raw materials |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007420A (en) * | 2016-05-23 | 2016-10-12 | 许昌金科资源再生股份有限公司 | Cement produced by using waste sintered brick powder as raw material, and preparation method of cement |
| CN106007420B (en) * | 2016-05-23 | 2018-07-03 | 许昌金科资源再生股份有限公司 | A kind of cement produced using waste and old fired brick powder as raw material and preparation method thereof |
| CN110293117A (en) * | 2019-08-09 | 2019-10-01 | 黄石市四棵水泥厂 | The recycling and reusing device and technology of a kind of industrial solid waste in rotary kiln |
| CN110862236A (en) * | 2019-11-25 | 2020-03-06 | 鄂尔多斯市君正能源化工有限公司 | Cement clinker and preparation method thereof |
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Application publication date: 20130220 |