CN104556754A - Method for preparing steel slag cement - Google Patents
Method for preparing steel slag cement Download PDFInfo
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- CN104556754A CN104556754A CN201410727692.XA CN201410727692A CN104556754A CN 104556754 A CN104556754 A CN 104556754A CN 201410727692 A CN201410727692 A CN 201410727692A CN 104556754 A CN104556754 A CN 104556754A
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- cement
- slag
- steel slag
- rotary kiln
- preparation
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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
-
- 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
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Abstract
The invention discloses a method for preparing steel slag cement. The steel slag cement comprises the following raw materials in percentage by weight: 80-95% of a cement raw meal and 5-20% of steel slag, wherein the cement raw meal is ordinary Portland cement raw material and the particle size of the steel slag is 5mm-30mm. The method comprises the following steps of feeding steel slag into a cement rotary kiln from an opening additionally formed in the kiln tail end, far away from fire, of the cement rotary kiln, calcining steel slag in the cement rotary kiln, enabling the steel slag to gradually move towards a close-to-fire end inside the cement rotary kiln, partially melting the steel slag and mixing the steel slag and other raw materials. The steel slag cement prepared by the method is low in cost and high in quality.
Description
Technical field
The present invention relates to cement technology field, particularly relate to a kind of preparation method of steel slag cement.
Background technology
Main component and the cement of slag are consistent, and its mineral facies are also similar, so, can have now people and propose to use slag as the starting material of manufacture of cement, meanwhile, in slag, have a certain amount of iron, the part iron powder in manufacture of cement can be substituted.
Slag is as the byproduct of Iron and Steel Production, and its output is larger, and a large amount of soils has been occupied in the accumulation of slag, and on the other hand, the materials such as the silicon in slag, manganese, phosphorus, sulphur penetrate into underground, also can damage environment.Therefore using slag as cement producting material be by steel produce in produce slag carry out utilization of waste material, be Sustainable development and recycling economy development effective means, enable environment protection and Economic development coordinate to carry out.But, although slag is similar to the component of cement, and due to the difference of mineral facies, the activity of slag is extremely low, therefore, how to realize exciting of the potential gelling property of slag, and ensure the economy in slag recycling process, reducing energy consumption, is the key of slag cycling and reutilization.
The lateral reactivity of slag without independently water is active, but effectively can be excited by physics, chemical means by slag itself.In currently available technology in cement production process, by the trial replacing a part of iron powder and raw material after steel slag grinding and together carry out calcining, but due to reasons such as slag liquidus temperature are lower, easily cause the problem of rotary kiln skinning, do not form corresponding production technique, meanwhile, due to higher to fineness requirement, slag grinding in early stage also result in the larger raising of production cost.So, adopt slag production cement to there is cost in prior art high, of poor quality, cause the problems such as rotary kiln skinning.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of preparation method of steel slag cement, and main purpose reduces costs, and improves quality.
For achieving the above object, the present invention mainly provides following technical scheme:
On the one hand, embodiments provide a kind of preparation method of steel slag cement, calcine with cement rotary kiln, composition and the weight percentage of described steel slag cement raw material are: cement slurry 80 ~ 95%, slag 5 ~ 20%; Wherein said cement slurry is ordinary Portland cement raw material, and the particle diameter of described slag is 5mm-30mm;
Wherein increase opening at the cement rotary kiln tail being positioned at fire end far away, the opening that slag increases from kiln tail is added cement rotary kiln, and slag moves to nearly fire end gradually in cement rotary kiln, and mixes with other starting material in kiln after slag partial melting.
As preferably, the gradient of described cement rotary kiln is 3.5-4.0%, and rotating speed is 3.0-4.0r/s.
As preferably, in described cement rotary kiln, maximum gas temperature can not lower than 1500 DEG C, and cement slurry and slag hot face temperature are not less than 1400 DEG C.
As preferably, to control in calcination process amount of liquid phase between 20%-30%.
As preferably, described cement slurry rate of decomposition is 90-95%, and fuel can perfect combustion in decomposing furnace and rotary kiln, and in tertiary-air pipe, temperature is 18-22m/s, and the ratio of the primary air flow reasonable opinion air requirement of Multi-channel coal pipe should not be greater than 15%.
Compared with prior art, beneficial effect of the present invention is:
Steel slag cement of the embodiment of the present invention and preparation method thereof adds particulate state slag on the basis of existing ordinary Portland cement raw material, need not carry out abrasive dust, ensure that low cost.In addition, by adding slag at kiln tail, slag moves to nearly fire end gradually in kiln, and mixes with other starting material in kiln after slag partial melting, produces and obtains silicate cement.By high-temperature reconstruction in calcination process, the crystal formation changing slag increases the activity of slag, and reacts between slag and cement slurry and recombinate, and significantly improves activity of steel slag.By adding mixed liquor phasor in slag particle diameter regulating stove, can prevent from reducing compound eutectic point because slag adds, causing the problem of rotary kiln skinning.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but not as a limitation of the invention.In the following description, the not necessarily same embodiment that different " embodiment " or " embodiment " refers to.In addition, special characteristic, structure or feature in one or more embodiment can be combined by any suitable form.
Content in the embodiment of the present invention is weight percentage.
Embodiment 1
Ordinary Portland cement raw material are calcined at cement rotary kiln, opening is increased at the cement rotary kiln tail being positioned at fire end far away, the opening that slag increases from kiln tail is added cement rotary kiln, slag moves to nearly fire end gradually in cement rotary kiln, and mix with other starting material in kiln after slag partial melting, finally obtain steel slag cement.Wherein cement slurry is made up of Wingdale, clay and iron powder, and the concrete proportioning of raw material is: Wingdale 74.1%, clay 18%, iron powder 2.9%, slag 5%; The particle size range of slag is between 5mm-30mm.The gradient of cement rotary kiln is 3.5-4.0%, and rotating speed is 3.0-4.0r/s, ensures that slag mixes fully with cement slurry.In cement rotary kiln, maximum gas temperature can not lower than 1500 DEG C, and cement slurry and slag hot face temperature are not less than 1400 DEG C, ensure that slag self mineral facies change and the required temperature that reacts in interface and cement slurry.Control amount of liquid phase in calcination process, between 20%-30%, to ensure not cause kiln skinning.Cement slurry rate of decomposition is 90-95%, and fuel is energy perfect combustion in decomposing furnace and rotary kiln, and in tertiary-air pipe, temperature is 18-22m/s, and the ratio of the primary air flow reasonable opinion air requirement of Multi-channel coal pipe is not more than 15%.
Embodiment 2
The present embodiment is different from embodiment 1 to be: the concrete proportioning of raw material is: Wingdale 70.2%, clay 17.1%, iron powder 2.7%, slag 10%.
Embodiment 3
The present embodiment is different from embodiment 1 to be: the concrete proportioning of raw material is: Wingdale 66.3%, clay 16.1%, iron powder 2.6%, slag 15%.
Embodiment 4
The present embodiment is different from embodiment 1 to be: the concrete proportioning of raw material is: Wingdale 62.4%, clay 15.2%, iron powder 2.4%, slag 20%.
In the embodiment of the present invention, clinker moduli is set as that Wingdale saturation factor (KH) value is between 0.90-0.92.Cement slurry, i.e. Wingdale, clay, iron powder (employing iron tailings) three kinds of raw materials grinding in advance before cement sintering, grinding fineness is lower than 8% more than 80um square hole sieve, and slag crosses square hole sieve without powder after fragmentation, and sieve gets the particle slag of particle diameter 5mm ~ 30mm.Carry out mixed calcining with cement slurry again, after having calcined, compound selects grate cooler to cool, and goes out the clinker temperature of cooler not higher than envrionment temperature 70 DEG C.
Below not add the cement slurry of slag as a comparison case, the ultimate compression strength of mortar specimen be who knows by the cement detecting the embodiment of the present invention and comparative example.Specifically see the following form 1.Wherein the ratio of comparative example is Wingdale 78%, clay 19%, iron powder 3%..
Table 1
Can be found out by table 1; the performance of the steel slag cement that the embodiment of the present invention obtains is substantially identical with the performance of existing ordinary Portland cement; but the cost of the embodiment of the present invention is far below existing ordinary Portland cement, and a large amount of slags as refuse can be consumed, protect environment.
In addition, find that slag fineness and volume are on the impact of its clinker mineral kind, mineral content and hydrated properties through contrast, specific as follows:
Compared with mixing with after existing slag abrasive dust, after slag mixes with coarse particles in the embodiment of the present invention, more can reduce the firing temperature burning till grog, improve amount of liquid phase, promote the absorption of free calcium oxide.And because slag grindability is poor, being ground to grinding shape need have great power consumption.In addition, the embodiment of the present invention controls the particle diameter of slag, can control amount of liquid phase in cement rotary kiln number.
Find after X-ray diffraction and Infrared spectroscopy, after in the embodiment of the present invention, slag mixes with coarse particles, the increase of iron aluminium phase content, easily replaces silicon phase in slag, generates more calcium aluminate and calcium aluminoferrite.
Learnt by X-ray diffraction and Hydration Heat Analysis, after in the embodiment of the present invention, slag mixes with coarse particles, its C brought into
2s and C
3s can play the effect of crystal seed in the sintering process of grog, promotes C
2s and C
3the formation of S, the speed of growth increases, and crystal grain size increases, thus causes hydration reaction exothermic peak to postpone, thermal discharge minimizing, coarse particles slag be mixed with the preparation being beneficial to low heat cement.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (5)
1. the preparation method of steel slag cement, calcines with cement rotary kiln, it is characterized in that, composition and the weight percentage of described steel slag cement raw material are: cement slurry 80 ~ 95%, slag 5 ~ 20%; Wherein said cement slurry is ordinary Portland cement raw material, and the particle diameter of described slag is 5mm-30mm;
Wherein increase opening at the cement rotary kiln tail being positioned at fire end far away, the opening that slag increases from kiln tail is added cement rotary kiln, and slag moves to nearly fire end gradually in cement rotary kiln, and mixes with other starting material in kiln after slag partial melting.
2. the preparation method of steel slag cement according to claim 1, is characterized in that, the gradient of described cement rotary kiln is 3.5-4.0%, and rotating speed is 3.0-4.0r/s.
3. the preparation method of steel slag cement according to claim 1, in described cement rotary kiln, maximum gas temperature can not lower than 1500 DEG C, and cement slurry and slag hot face temperature are not less than 1400 DEG C.
4. the preparation method of steel slag cement according to claim 1, in control calcination process, amount of liquid phase is between 20%-30%.
5. the preparation method of steel slag cement according to claim 1, described cement slurry rate of decomposition is 90-95%, fuel is energy perfect combustion in decomposing furnace and rotary kiln, in tertiary-air pipe, temperature is 18-22m/s, and the ratio of the primary air flow reasonable opinion air requirement of Multi-channel coal pipe should not be greater than 15%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410727692.XA CN104556754A (en) | 2014-12-03 | 2014-12-03 | Method for preparing steel slag cement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410727692.XA CN104556754A (en) | 2014-12-03 | 2014-12-03 | Method for preparing steel slag cement |
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| CN104556754A true CN104556754A (en) | 2015-04-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114907029A (en) * | 2022-05-31 | 2022-08-16 | 武汉理工大学 | Method for preparing ecological auxiliary cementing material by utilizing high-iron granular slag sintering solid waste |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139175A (en) * | 2006-08-29 | 2008-03-12 | 中国建筑材料科学研究总院 | Cement presintering production method and system |
| CN102923979A (en) * | 2012-10-19 | 2013-02-13 | 安徽海螺建材设计研究院 | Clinker production line for novel dry process cement kiln and denitration process method for clinker production line |
| CN103601379A (en) * | 2013-11-15 | 2014-02-26 | 武汉理工大学 | Phase-separated clinker calcination process for outside-thrown high-calcium granulated slag |
-
2014
- 2014-12-03 CN CN201410727692.XA patent/CN104556754A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139175A (en) * | 2006-08-29 | 2008-03-12 | 中国建筑材料科学研究总院 | Cement presintering production method and system |
| CN102923979A (en) * | 2012-10-19 | 2013-02-13 | 安徽海螺建材设计研究院 | Clinker production line for novel dry process cement kiln and denitration process method for clinker production line |
| CN103601379A (en) * | 2013-11-15 | 2014-02-26 | 武汉理工大学 | Phase-separated clinker calcination process for outside-thrown high-calcium granulated slag |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114907029A (en) * | 2022-05-31 | 2022-08-16 | 武汉理工大学 | Method for preparing ecological auxiliary cementing material by utilizing high-iron granular slag sintering solid waste |
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Application publication date: 20150429 |