CN101913787A - Method for calcining and activating shale into cement admixture - Google Patents
Method for calcining and activating shale into cement admixture Download PDFInfo
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- CN101913787A CN101913787A CN 201010236749 CN201010236749A CN101913787A CN 101913787 A CN101913787 A CN 101913787A CN 201010236749 CN201010236749 CN 201010236749 CN 201010236749 A CN201010236749 A CN 201010236749A CN 101913787 A CN101913787 A CN 101913787A
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Abstract
The invention provides a method for calcining and activating shale into a cement admixture, comprising the steps of: grinding the shale into particles and adding the particles in a grate cooler of a cement kiln, calcining the shale by utilizing the waste heat of grog so as to activate the shale into the cement admixture. The shale has the particle size of 5-15 mm and the water content of 2-5%; the added amount of the shale occupies 5 to 15% of the grog; and the shale is symmetrically added from two sides of a single-stage bed at the hot end of the grate cooler. The invention has the advantages that the waste heat of the high-temperature grog out from the cement kiln is used as energy to activate the shale without newly building a kiln, therefore, the building investment is saved; and the calcined admixture is directly mixed with the grog, therefore, the cement production technology step is simplified, the cement production cost is reduced, and the prominent economic effect is achieved.
Description
Technical field
The present invention relates to method for production of cement, specifically, relate to a kind of method of calcining and activating shale into cement admixture.
Background technology
China's cement industry mainly utilizes blast-furnace slag, flyash, pozzolanic materials etc. to make cement mixture, along with the continuous expansion of cement market production capacity and the minimizing day by day of Mineral resources, usually the admixture such as the resources such as slag, flyash that can be used as cement are day by day in short supply, price raises up year by year, and exploitation cement mixture new variety day by day become the task of top priority of Cement industry research.
In recent years, people invest shale to sight, and shale is with SiO
2And Al
2O
3Be the clay matter sedimentogeneous rock of major ingredient, it is very extensive to distribute.Aluminium silicate mineral in the shale is a crystal form, and Stability Analysis of Structures does not have hydration activity, but through after the calcination processing of certain temperature, promptly shows tangible hydration activity.About burning the pozzolanic activity of shale, a kind of viewpoint thinks that it decomposes the formed amorphous substance in back from clay mineral, and another kind is then thought it from the formed glassy phase of high-temperature fusion, and these two kinds of viewpoints have important directive significance to the thermal treatment process of burning shale.Appoint state's great " burning the pozzolanic activity research of shale " to draw the pozzolanic activity that burns shale according to Shanghai silicate institute and both not exclusively depended on the wherein content of amorphous state, do not depend on the appearance of glassy phase yet, but relevant with clay mineral in the thermolysis effect of certain specific range of temperatures.Show from experimental result: the pozzolanic activity that the shale of calcining certain hour has in the scope of 700～800 ℃ (best 750 ℃), it is good cement admixture, can be used to produce cement, the engineering application method of calcining and activating shale into cement admixture is born in succession.Two kinds of methods are arranged at present, the one, native shaft kiln calcination, the investment of putting up a kiln is less, and about 5,000,000 yuan, production cost is also lower, and about 85 yuan/ton, but industrial scale is little, 150 tons/day of output; The 2nd, calcined by rotary kiln, industrial scale is big, 250 tons/day of output, but the investment of putting up a kiln is huge, surpasses 1,000 ten thousand yuan, and production cost is also higher, about 110 yuan/ton.
Above-mentioned two kinds of methods all need be thrown huge fund and newly be puted up a kiln, and refuel could be sintered into cement admixture with shale.Though solved the raw material sources problem of cement admixture, the comprehensive cost of cement is higher.Simultaneously, above-mentioned two kinds of methods all are to calcine out adulterant separately, again with the grog fusion, make the cement production process step still numerous and diverse, do not save the fusion step.
On the other hand, have a large amount of waste heats to utilize in the cement production process, for example, after grog burnt till, its temperature was a forced draft cooling at 1300～1400 ℃ at present, and hot blast (secondary air, tertiary air) is used for preheating cement raw material and fuel.
Summary of the invention
Purpose of the present invention provides a kind of method of calcining and activating shale into cement admixture.This method is that shale is directly added the manufacture of cement kiln system, utilizes the activation evergy of the heat of cement kiln kiln discharge high temperature chamotte as burning shale, thereby need not newly to put up a kiln, and the direct and grog fusion of the adulterant of calcining out can be simplified the cement production process step.
Technical scheme of the present invention is as follows:
A kind of method of calcining and activating shale into cement admixture, it is particle that shale is pulverized, and adds the grate cooler of cement kiln, utilizes the waste heat calcining shale that who knows, makes shale activation becoming cement admixture.
Particle diameter 5～the 15mm of described shale, water content 2～5%.
The add-on of described shale be who knows 5～15%.
Described shale adds from the zygomorphy of the one section bed in grate cooler hot junction.
Beneficial effect of the present invention:
Utilize the energy of the heat of cement kiln kiln discharge high temperature chamotte, thereby need not newly to put up a kiln, save initial cost as activating shale; The cement production process step has been simplified in the direct and grog fusion of the adulterant of calcining out, makes the manufacture of cement cost descend obvious economic.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Embodiment
At first introduce the principle of work of cement kiln grate cooler:
The cooling machine carries out quick cooling to the high temperature chamotte (1300～1400 ℃) that goes out through calcined by rotary kiln by hot junction controlling flow grate plate, owing to adopted efficient controlling flow technology, take into full account the resistance and the distribution of the bed of material, utilize regional adjustable mode that grog is cooled off, thereby it is more even that cooling air is distributed, the grog quenching is effective, guaranteed the abundant cooling of grog, the reduction of drop temperature, the raising of heat recovery efficiency, and strong to the adaptability of burning till grog.
The process that enters of controlling flow grate plate cooling air: blower fan → remittance bellows → each arm → each arm variable valve → fixing inflation crossbeam → each controlling flow grate plate unit → grog layer.
Be provided with " sealing " blower fan at each air compartment, scurry to each air compartment to prevent that cooling air in the grog layer from returning, and cooling and reduce the mutual leakage material of each grate plate.
The high temperature chamotte bed of combing from the hot junction is advanced into follow-up combs bed, is cooled to envrionment temperature+65 ℃, and through the grog crusher in crushing extremely≤25mm (accounting for more than 90%) is so that conveying, storage and grinding.Simultaneously, the cooling air that blower fan blasts after heat exchange absorbs heat energy in the grog as secondary air go into kiln, tertiary air is gone into decomposing furnace, also can be used as the oven dry of raw material or coal and uses wind, remaining waste gas enters atmosphere after gathering dust.Discharge through the ash bucket air valve by the grate plate thin grog that seam leaks down of combing each other, carry warehouse-in by the bottom handling equipment.
Characteristics of the present invention are: directly shale is added grate cooler, utilize the heat of kiln discharge high temperature chamotte to calcine shale, workflow is referring to Fig. 1, the shale that is stored in stockyard 2 is sent into crusher 3 fragmentations by feeding machine 1, sift out the shale particle of particle diameter 5～15mm, send into intermediate bin 4, after weighing balance 5 meterings, send into revolution lock wind blanking device 6 by pneumavalve 7, enter one section front portion of rotary kiln cooling machine 9 then, in 600～800 ℃ of environment the calcining postactivated, be delivered to clinker warehouse with grog through machine for zipper again.
Technology emphasis, difficult point are as follows:
1. the water ratio of pan feeding shale and add-on.
After shale adds, to two, the temperature of tertiary air still can produce bigger influence, after just requiring shale to add, this reduces influence as far as possible to producing, according to practical condition, when the secondary air temperature can reach 1100 ℃, after adding shale, the temperature lower bound is by 1000 ℃ of considerations, be temperature drop in 100 ℃ of scopes, the water ratio of corresponding shale should be controlled in 2～5% scopes, add-on should be controlled in 5～15% scopes of grog flow.
2. after shale joins cooler, the grog cooling performance is all brought negative impact,, must control the granularity of shale in order to reduce this negative impact.
Generally speaking, the amount of raw meal particle size below 5mm can exert an influence to the cooling performance of cooler greater than 15% o'clock, so shale granularity major part should be greater than 5mm.If granularity is too little in addition, also has parts of fine shale easily and enter in the kiln, thereby clinker quality is had a negative impact with secondary air, tertiary air.Raw meal particle size is big more, and material heat exchanger time and calcination time are long more, so the shale granularity also should not be greater than 15mm, so the shale granularity should be in 5～15mm scope.
3. shale is in the implantation site that adds of cooler.
According to the calcining temperature requirement of shale, shale must add at one section bed of cooler.If shale adds at the fixed bed of cooler, owing to the motion that does not have movable grate, material is not easy motion, the situation that accumulation takes place material may occur, so shale is preferably in first row's movable grate place's adding.
4. shale adds mode.
If shale enters cooler by a discharge opening because the wider width of cooler, shale can not be on whole cooler width uniform distribution, so shale opening for feed quantity is by 2 designs, respectively in the and arranged on left and right sides of cooler.Like this, shale is from the symmetrical in opposite directions charging of and arranged on left and right sides, is heated evenly, fully, fast.
Relatively seeing the following form of several calcining and activating shale methods:
Claims (4)
1. the method for a calcining and activating shale into cement admixture is characterized in that: the shale pulverizing is particle, adds the grate cooler of cement kiln, utilize the waste heat calcining shale of grog, make shale activation becoming cement admixture.
2. according to the method for the described calcining and activating shale into cement admixture of claim 1, it is characterized in that: the particle diameter 5～15mm of described shale, water content 2～5%.
3. according to the method for the described calcining and activating shale into cement admixture of claim 1, it is characterized in that: the add-on of described shale is 5～15% of a grog.
4. according to the method for the described calcining and activating shale into cement admixture of claim 1, it is characterized in that: described shale adds from one section bed zygomorphy in grate cooler hot junction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010236749 CN101913787A (en) | 2010-07-23 | 2010-07-23 | Method for calcining and activating shale into cement admixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010236749 CN101913787A (en) | 2010-07-23 | 2010-07-23 | Method for calcining and activating shale into cement admixture |
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|---|---|
| CN101913787A true CN101913787A (en) | 2010-12-15 |
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| CN 201010236749 Pending CN101913787A (en) | 2010-07-23 | 2010-07-23 | Method for calcining and activating shale into cement admixture |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211886A (en) * | 2011-03-10 | 2011-10-12 | 北川四星水泥有限公司 | Pozzolana mixture as well as preparation method and application thereof |
| CN108203281A (en) * | 2018-03-07 | 2018-06-26 | 重庆建工第七建筑工程有限责任公司 | A kind of microdilatancy injecting paste material and preparation method thereof |
| CN111777346A (en) * | 2020-07-23 | 2020-10-16 | 方苏峤 | Quick burning method for cement clinker |
| EP3828151A1 (en) | 2019-11-26 | 2021-06-02 | Cemgreen ApS | Method for producing cement comprising a supplementary cementitious material, and cement obtainable thereby |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122784A (en) * | 1994-11-11 | 1996-05-22 | 蒋里军 | Composite silicate cement and prodn. method and equipment thereof |
| CN101456690A (en) * | 2009-01-07 | 2009-06-17 | 中国建筑材料科学研究总院 | Method and system for preparing active coal gangue |
-
2010
- 2010-07-23 CN CN 201010236749 patent/CN101913787A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122784A (en) * | 1994-11-11 | 1996-05-22 | 蒋里军 | Composite silicate cement and prodn. method and equipment thereof |
| CN101456690A (en) * | 2009-01-07 | 2009-06-17 | 中国建筑材料科学研究总院 | Method and system for preparing active coal gangue |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211886A (en) * | 2011-03-10 | 2011-10-12 | 北川四星水泥有限公司 | Pozzolana mixture as well as preparation method and application thereof |
| CN108203281A (en) * | 2018-03-07 | 2018-06-26 | 重庆建工第七建筑工程有限责任公司 | A kind of microdilatancy injecting paste material and preparation method thereof |
| CN108203281B (en) * | 2018-03-07 | 2021-05-11 | 重庆建工第七建筑工程有限责任公司 | Micro-expansion grouting material and preparation method thereof |
| EP3828151A1 (en) | 2019-11-26 | 2021-06-02 | Cemgreen ApS | Method for producing cement comprising a supplementary cementitious material, and cement obtainable thereby |
| WO2021104866A1 (en) | 2019-11-26 | 2021-06-03 | Cemgreen Aps | Methods for producing cement comprising a supplementary cementitious material, and cement obtainable thereby |
| CN111777346A (en) * | 2020-07-23 | 2020-10-16 | 方苏峤 | Quick burning method for cement clinker |
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Application publication date: 20101215 |