CN105174756A - Method for preparing cement from manganese iron slag - Google Patents

Method for preparing cement from manganese iron slag Download PDF

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Publication number
CN105174756A
CN105174756A CN201510595374.7A CN201510595374A CN105174756A CN 105174756 A CN105174756 A CN 105174756A CN 201510595374 A CN201510595374 A CN 201510595374A CN 105174756 A CN105174756 A CN 105174756A
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raw material
ferromanganese
kiln
slag
ferromanganese slag
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陈永忠
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Sichuan Mingchuan Chengyu Electrical & Mechanical Co Ltd
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Sichuan Mingchuan Chengyu Electrical & Mechanical Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

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Abstract

The invention discloses a method for preparing cement from manganese iron slag, which comprises the following steps: (a) raw material crushing: crushing the raw materials mainly composed of limestone, manganese iron slag, shale, sandstone and iron ore to respectively obtain limestone particles, manganese iron slag particles, shale particles, sandstone particles and iron ore particles; (b) raw material prehomogenization: carrying out stratified piling on various particles obtained in the step (a); (c) green material preparation; (d) green material homogenization; (e) preheating and decomposition; (f) clinker firing; and (g) clinker milling: cooling the fired clinker, and milling the clinker to the required particle size, thereby completing the cement production. The method can improve the sinterability of the green material, improve the clinker quality, enhance the in-kiln decomposition rate, increase the operation rate of the rotary kiln, lower the clinker firing heat loss and cement comprehensive power consumption, enhance the cement yield and greatly lower the cement production cost.

Description

A kind of method utilizing ferromanganese slag to prepare cement
Technical field
The present invention relates to field of cement production, be specifically related to a kind of method utilizing ferromanganese slag to prepare cement.
Background technology
In recent years, most of cement mill utilizes industrial residue to be mainly incorporated in cement with the form of blended material, and utilize industrial residue replace part of cement raw materials for production seldom, mainly due to residue contamination Working environment, the reason such as batching is complicated, field control is difficult, raw ingredients fluctuation is comparatively large, clinker quality is poor; And some producer is eager for instant success and quick profits when utilizing waste residue, the waste residue kind used to reduce production cost reaches three or four kinds, thinks and just can reduce costs like this; But really there is many problems in actual production, cause production to be difficult to control, clinker quality difference etc., finally abandon the utilization of waste residue.
Summary of the invention
The object of the present invention is to provide a kind of method utilizing ferromanganese slag to prepare cement, the method can improve the burn-ability of raw material, accelerates the formation of clinker mineral, improves clinker; Meanwhile, accomplish effective utilization of waste residue, reduce manufacture of cement cost.
The present invention for achieving the above object, realizes by the following technical solutions:
Utilize ferromanganese slag to prepare a method for cement, comprise the following steps:
(a) raw material crushing: to mainly consist of Wingdale, ferromanganese slag, shale, sandstone, iron ore raw material carry out fragmentation, obtain limestone particle, ferromanganese solid impurity particle, shale particle, sandstone particle, iron ore particle respectively, in raw material, the mass percent of Wingdale is 60% ~ 80%, the mass percent of ferromanganese slag is 10% ~ 20%, all the other are shale, sandstone, iron ore;
(b) raw material prehomogenization: various particles step (a) obtained carry out layering stacking;
C prepared by () raw material: adopt the mode that cuts to carry out feeding to the feed particles of stacking in step (b), carry out grinding, obtain raw material to feed particles;
(d) raw material homogenizing: adopt the mode of pneumatic blending fully to mix the raw material that step (c) obtains;
(e) pre-thermolysis: by preheater, preheating is carried out to raw material, and make raw material complete decomposed reaction;
(f) sinter leaching: the raw material completed after preheating Sum decomposition enter into rotary kiln, carry out burning till of grog;
(g) grog grinding: cooling down is carried out to the grog after burning till, then chamotte powder is milled to required granularity, completes manufacture of cement.
Further, preferably, the detailed process of described step (b) is: stacked by tiling, mode overlapping up and down by the raw material after fragmentation by stacker, different raw materials is positioned at different layers, and the thickness of every one deck is even, the thickness of adjacent two layers is equal.
Further, preferably, the concrete operations cutting mode in described step (c) are: the direction along raw material tiling cuts the bed of material successively, when cutting, vertically cuts all bed of materials from top to bottom, until take at every turn.
Contriver is found by a large amount of research and practices, by adopting the material homogenizer of aforesaid way and cutting mode feeding, can reduce the quality fluctuation of raw material, be conducive to producing the higher grog of quality, and can stablize the production of firing system; The adaptability to glutinous wet stock can also be improved in addition, for stably manufactured and raising operation rate create conditions.
Further, preferably, in described step (c), the detailed process of grinding is:
(c1) feed particles falls mill central authorities by lock feeding device through blanking scraper-trough conveyer, under the influence of centrifugal force, be thrown toward mill edge and be subject to the spreading grinding of grinding roller, the feed particles after pulverizing is overflowed from the edge of mill, is taken up oven dry by from nozzle at high speeds hot gas flow upwards;
(c2) according to the difference of gas velocity, part material particle is taken in powder separating machine by air-flow, and meal turns back on mill after being separated, grinding again; Fine powder then goes out mill with air-flow, collects, be raw material in dust arrester installation;
(c3) after the feed particles do not taken up by air-flow overflows mill, by the chapelet of outer circulation feeding powder separating machine, coarse particles falls back mill, again extrudes grinding.
Further, preferably, the detailed process of described step (e) is:
(e1) by the raw material feeding preheater after homogenizing, raw material, under the shock action of preheater high speed upstream, move upward and are scatter;
(e2) air-flow drives raw material to enter in cyclone cylinder, be forced in the annulus between cyclone muff and inner core and do rotational flow, and rotate while move downward, by cylindrical shell to cone, the end of cone can be extended to always, then then rotate up rising, discharged by vapor pipe;
(e3) raw material after preheating enter into decomposing furnace, and in decomposing furnace, complete carbonate decomposition reaction.
Further, preferably, the detailed process of described step (f) is:
(f1) in rotary kiln, carbonate decomposes rapidly further and a series of solid state reaction occurs, and generates tricalcium aluminate, tetracalcium aluminoferrite, Dicalcium Phosphate (Feed Grade) in cement clinker;
(f2) along with temperature of charge be increased to 1300 DEG C time, tricalcium aluminate, tetracalcium aluminoferrite, Dicalcium Phosphate (Feed Grade) become liquid phase, are dissolved in Dicalcium Phosphate (Feed Grade) in liquid phase and calcium oxide and carry out reaction and generate a large amount of tricalcium silicate.
Further, preferably, the ferromanganese slag in described step (a) is obtained by following steps:
(a1) get the ferromanganese waste residue produced in Blast Furnace Ferromanganese Manufacturing alloy process, then by itself and coal gangue in mass ratio 6:4 carry out fragmentation, and Homogeneous phase mixing, obtain mixture, the granularity of ferromanganese waste residue and coal gangue is less than or equal to 2mm;
(a2) mixture step (a1) obtained is sent in fluidizing furnace and is carried out burn processing, the air intake wind-warm syndrome at least 300 DEG C of fluidizing furnace, working temperature at least 650 DEG C, and the lime-ash obtained is required ferromanganese slag.
Further, preferably, the kiln hood coal consumption of described rotary kiln accounts for 40% of total coal consumption, and kiln tail coal consumption accounts for 60% of total coal consumption.
Further, preferably, the air inlet fan pressure of described rotary kiln is 5400 ~ 5500Pa, and the kiln speed of rotary kiln is 3.9 ~ 4.0r/min.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention by mixing appropriate ferromanganese slag in raw material, and significantly improve the burn-ability of raw material, accelerate the formation of mineral, tricalcium silicate is formed in a large number in 1250 to 1350 DEG C of temperature ranges, and reduces f-CaO content in grog.
(2) the ferromanganese slag in the present invention is due to containing trace ingredients MnO and CaF2, by its effect, reduce high-temperature liquid-phase viscosity, and therefore facilitate the formation of tricalcium silicate and crystallization and reduce the reaction activity of Formation Process of Clinker, add grog mesosilicic acid DFP, tricalcium aluminate and silicate minerals total amount, reduce C4AF content in grog.
(3) in the present invention, ferromanganese slag is through high-temperature calcination discharge and again through fluidizing furnace process after carrying out water quenching technology in time, its main component is CaO and SiO2 and other are micro-on a small quantity, they itself have had very high activity, without the need to again decomposing, therefore, after replacing part Wingdale and sandstone raw material with the ferromanganese slag of part, raw material enter kiln rate of decomposition at least can bring up to more than 95%; Meanwhile, the K contained by the ferromanganese slag after water quenching technology and harmless treatment is also carried out in time through high-temperature calcination 2o, Na 2o, CI -, the objectionable constituent such as SO3, volatile fraction in former manganese ore enterprise produces, remains in and is all wrapped in the xln particulate of CaO and SiO2 with vitreum form in ferromanganese slag, be more just difficult to evaporate after fluidizing furnace process again; Therefore, with the ferromanganese slag (mixture) of part, after replacing part Wingdale and sandstone raw material, correspondingly just decrease into kiln objectionable constituent, reduce the chance of preheater and decomposing furnace Coating clogging, improve the operation factor of rotary kiln simultaneously.
(4) the present invention adopts ferromanganese slag as cement raw material, raw material grinding mill unit-hour output can be improved, improve the burn-ability of raw material, improve clinker quality, improve into kiln rate of decomposition, improve rotary kiln operation factor, reduce sinter leaching hear rate, the comprehensive power consumption of cement, increase cement output, the production cost of cement can be reduced by a relatively large margin.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment:
A kind of method utilizing ferromanganese slag to prepare cement described in the present embodiment, comprises the following steps:
(a) raw material crushing: to mainly consist of Wingdale, ferromanganese slag, shale, sandstone, iron ore raw material carry out fragmentation, obtain limestone particle, ferromanganese solid impurity particle, shale particle, sandstone particle, iron ore particle respectively, in raw material, the mass percent of Wingdale is 60% ~ 80%, the mass percent of ferromanganese slag is 10% ~ 20%, all the other are shale, sandstone, iron ore;
(b) raw material prehomogenization: various particles step (a) obtained carry out layering stacking;
C prepared by () raw material: adopt the mode that cuts to carry out feeding to the feed particles of stacking in step (b), carry out grinding, obtain raw material to feed particles;
(d) raw material homogenizing: adopt the mode of pneumatic blending fully to mix the raw material that step (c) obtains, utilize different fluidization airs, make the fluidisation expansion that parallel charge level in storehouse varies in size, the discharging of some regions, some regions fluidisation, thus make charge level in storehouse produce, carry out radial direction mixing homogenizing;
(e) pre-thermolysis: by preheater, preheating is carried out to raw material, and make raw material complete decomposed reaction;
(f) sinter leaching: the raw material completed after preheating Sum decomposition enter into rotary kiln, carry out burning till of grog;
(g) grog grinding: cooling down is carried out to the grog after burning till, then chamotte powder is milled to required granularity, completes manufacture of cement.
Particularly, the detailed process of step (b) is: stacked by tiling, mode overlapping up and down by the raw material after fragmentation by stacker, different raw materials is positioned at different layers, and the thickness of every one deck is even, and the thickness of adjacent two layers is equal;
The concrete operations cutting mode in step (c) are: the direction along raw material tiling cuts the bed of material successively, when cutting at every turn, vertically cut all bed of materials from top to bottom, until take, the mode of this " tiling is directly got " decreases raw materials quality fluctuation, be conducive to producing the higher grog of quality, and stablize the production of firing system.
In addition, the detailed process of the middle grinding of the step (c) of the present embodiment is:
(c1) feed particles falls mill central authorities by lock feeding device through blanking scraper-trough conveyer, under the influence of centrifugal force, be thrown toward mill edge and be subject to the spreading grinding of grinding roller, the feed particles after pulverizing is overflowed from the edge of mill, is taken up oven dry by from nozzle at high speeds hot gas flow upwards;
(c2) according to the difference of gas velocity, part material particle is taken in powder separating machine by air-flow, and meal turns back on mill after being separated, grinding again; Fine powder then goes out mill with air-flow, collects, be raw material in dust arrester installation;
(c3) after the feed particles do not taken up by air-flow overflows mill, by the chapelet of outer circulation feeding powder separating machine, coarse particles falls back mill, again extrudes grinding.
It should be noted that, the lock feeding device mentioned in this step, blanking scraper-trough conveyer, nozzle, mill, dust arrester installation, chapelet, powder separating machine etc. are the existing installation in manufacture of cement, its concrete structure, each other annexation and principle of work belong to technology well known in the art, just introduce no longer in detail at this.
Particularly, the detailed process of step (e) is:
(e1) by the raw material feeding preheater after homogenizing, raw material, under the shock action of preheater high speed upstream, move upward and are scatter;
(e2) air-flow drives raw material to enter in cyclone cylinder, be forced in the annulus between cyclone muff and inner core and do rotational flow, and rotate while move downward, by cylindrical shell to cone, the end of cone can be extended to always, then then rotate up rising, discharged by vapor pipe;
(e3) raw material after preheating enter into decomposing furnace, and in decomposing furnace, complete carbonate decomposition reaction.
In this step, achieve the predecomposition of raw material, raw material after warming, before entering rotary kiln, first in decomposing furnace, complete decomposition reaction, in decomposing furnace, the endothermic process of the exothermic process of fuel combustion and the carbonate decomposition of raw material, to carry out rapidly under suspended state or fluidized, makes the rate of decomposition of the raw material entering rotary kiln bring up to more than 90%.By original carbonate decomposition task of carrying out in rotary kiln, move on in decomposing furnace and carry out, fuel major part adds in decomposing furnace, small part is added by the kiln hood of rotary kiln, alleviate the thermal load of calcining in rotary kiln and bringing, extend the life-span of inner liner of rotary kiln material, be conducive to producing and maximize; In addition, because fuel mixes with raw material, the heat that fuel combustion produces passes to material in time, and burning, heat exchange and carbonate decomposition process are optimized, thus has a series of premium properties and the features such as high-quality, efficient, low consumption.
It should be noted that, the preheater mentioned in this step, cyclone cylinder, decomposing furnace etc. are the existing installation in manufacture of cement, and its concrete structure, each other annexation and principle of work belong to technology well known in the art, just introduce no longer in detail at this.
The detailed process of described step (f) is:
(f1) in rotary kiln, carbonate decomposes rapidly further and a series of solid state reaction occurs, and generates tricalcium aluminate, tetracalcium aluminoferrite, Dicalcium Phosphate (Feed Grade) in cement clinker;
(f2) along with temperature of charge be increased to 1300 DEG C time, tricalcium aluminate, tetracalcium aluminoferrite, Dicalcium Phosphate (Feed Grade) become liquid phase, are dissolved in Dicalcium Phosphate (Feed Grade) in liquid phase and calcium oxide and carry out reaction and generate a large amount of tricalcium silicate.
Preferably, the ferromanganese slag in the present embodiment step (a) is obtained by following steps:
(a1) get the ferromanganese waste residue produced in Blast Furnace Ferromanganese Manufacturing alloy process, then by itself and coal gangue in mass ratio 6:4 carry out fragmentation, and Homogeneous phase mixing, obtain mixture, the granularity of ferromanganese waste residue and coal gangue is less than or equal to 2mm;
(a2) mixture step (a1) obtained is sent in fluidizing furnace and is carried out burn processing, the air intake wind-warm syndrome at least 300 DEG C of fluidizing furnace, working temperature at least 650 DEG C, and the lime-ash obtained is required ferromanganese slag.
The ferromanganese slag dominant that step (a2) obtains is amorphous glass body mutually, there is higher activity, lingering section MnO, but affect not obvious on cement clinker and cement performance, find after tested, can be used as cement slurry and cement mixture for the production of ordinary Portland cement and composite Portland cement.
Below, for different proportioning raw materials and processing condition, the related physical property of the cement clinker that research the present invention obtains, and energy consumption problem.
First, select the raw material of four groups of different ratio, be respectively Sample A, B, C, D, shown in concrete table 1:
Table 1 raw material composition and ratio
Sample Wingdale Ferromanganese slag Sandstone Shale Iron ore
A 80% 0% 4% 12% 4%
B 75 10% 5% 7% 3%
C 70 15% 4% 9% 2%
D 60 20% 6% 8% 6%
Then, select the processing condition that different samples is corresponding different, as shown in table 2:
The different technology conditions that table 2 various sample is corresponding
Under processing condition shown in table 2, the specific surface area of the grog that various sample obtains, time of coagulation, bending and compressive strength and coal consumption amount are as shown in table 3:
The physical property of the grog that table 3 various sample obtains and coal consumption amount
Because after ferromanganese slag burden, the burn-ability of raw material improves, raw material absorb thermal load amount at preheater to be reduced, decomposition amount also corresponding minimizing in decomposing furnace, save heat, decrease the load of decomposing furnace, therefore, raw material discharge quantity can be improved, improve the unit-hour output of rotary kiln.As shown in table 2, compare the Sample A of not adding ferromanganese slag, sample B, C, D all make rotary kiln raw material discharge quantity increase, and improve about 9.0t/h, meanwhile, the grog unit-hour output of rotary kiln too increases about 6t/h.In addition, by table 3, we can find, with the raw material that ferromanganese slag Substitute For Partial Wingdale, sandstone, shale, iron ore obtain, compare traditional raw material not adding ferromanganese slag, when producing grog, current consumption for grinding raw material decreases, coal consumption also obviously reduces, and rotary kiln output obviously increases, and time of coagulation obviously shortens, bending and compressive strength remains unchanged, that is, the present invention compares traditional batching and production method, can on the basis ensureing quality product, effective reduction energy consumption, can also increase the output of rotary kiln simultaneously.
Can being found by table 2, be regulated by the consumption of correct coal (kiln hood coal), tail coal (kiln tail coal), ensure that on the normal basis produced, also reducing the consumption of coal.When just starting to test, owing to not having the experience of this respect, under total coal consumption does not subtract, and coal ratio does not adjust end to end, performance kiln discharge tail coal is on the high side, kiln tail system temperature rises, and sticky stifled phenomenon appears in Pyatyi tremie pipe and Pyatyi cone, in practice process, reduce coal consumption gradually, suitably adjust coal ratio end to end, reduce tail coal ratio, increase head coal ratio, as shown in table 4.By practice, thermal regulation is controlled, and solves kiln tail washings phasor and occurs too early, and sticky stifled problem appears in tremie pipe and cone.
The ratio of table 4 kiln hood and kiln tail coal
Sample Head coal (t/h) Tail coal (t/h) Head coal (%) Tail coal (%)
A 6.7 10.8 38 62
B 6.3 9.4 40 60
C 6.4 9.3 40 60
D 6.3 9.6 40 60
In addition, after ferromanganese slag burden, clinkering zone easily ties kliner coating, and cause the material level in kiln to raise, kiln tail is smoldered, and the appearance of gold zone material.For addressing these problems, contriver finds through large quantifier elimination and experiment, by the control to kiln speed, can solve the problem, and does not notice in producing that kiln speed is on producing the impact brought in the past.The present invention is by after bringing up to 3.9 ~ 4.0r/min by kiln speed, compare traditional kiln speed (lower than 3.9r/min), increase the tumbling rate of material in kiln, realize thin material to burn soon, both increase kiln ventilation area, added the heat exchanger effectiveness in kiln, additionally reduce reducing atmosphere in kiln, make the sub-valency iron in grog and oxygen fully oxidized, avoid the generation of gold zone material; Meanwhile, in kiln, kliner coating is thinner, and the material level of material in kiln reduces, and solve kiln tail overflow phenomenon, kiln ventilation improves, and is easy to the raising of quantity and quality, makes kiln condition move towards benign cycle.As shown in table 5 is the yield data of various sample under identical kiln speed and the yield data of same sample under different kiln speed, can be found by table 5, part Wingdale, shale, sandstone, iron ore is instead of owing to adopting ferromanganese slag, under identical kiln speed, the clinker that sample B obtains obviously increases, and kiln electric current reduces on the contrary slightly; And along with the increase of kiln speed, kiln electric current increases gradually, clinker also increases gradually, but after kiln speed is more than 4.0r/min, clinker increases not obvious, kiln electric current increases clearly on the contrary, namely energy consumption increases obviously, therefore, when kiln speed is 3.9 ~ 4.0r/min, can not only clinker be improved, can also guarantee as much as possible not bring excessive energy consumption simultaneously.
Kiln electric current, the yield data of table 5 sample under different kiln speed
In addition, the present invention, also by coal injection pipe is pulled out 5-10cm by kiln, makes the reach of fire point location-appropriate, due to MnO, SO3, CaF of containing in ferromanganese slag 2with some other trace element etc., in calcination process, play the effect (or effect of similar mineralizer) of fusing assistant and mineralizer, promote that clinker mineral is formed at a lower temperature in a large number; Therefore, behind the position of adjustment burner, can ensure that flame is vivaciously strong, bright complete, do not wash away refractory brick or kliner coating, reduce the generation of secondary kliner coating, main kliner coating length can return to original length simultaneously.
The present invention can obtain following effect:
1, waste residue utilization, energy-conserving and environment-protective
From commercial test result: new dry process grog raw materials for production batching, with part ferromanganese slag, replace sandstone, shale, the iron ore of part Wingdale and part, the grog of high-quality can be produced completely; Article one, 2500t/d clinker production line can consume 100,000 tons, waste residue (2500 × 1.5 × 0.15 × 0.60 × 300=100000) for 1 year, should be country and enterprise's saving exploit mineral resources 150000 tons mutually.
2, improve raw material grinding mill output, reduce production cost
The Wingdale unit price that present Modern Dry Process Cement Plant enters factory is about 40 yuan/about t, sandstone enters factory's unit price and is about 35 yuan/about t, and ferromanganese slag only needs 30-35 unit/about t, according to laboratory test result and trial production result, with the ferromanganese slag (mixture) of 15%, replace 10.0% Wingdale and 5.0% sandstone be example, only this raw material production cost per ton just can reduce about 0.7 yuan, within 1 year, can be cement mill save direct production cost expense about about 700,000 yuan; Simultaneously as can be seen from above testing data, after mixing mixture, raw mill ton power consumption reduces about 1.5kwh, within 1 year, will save the production electricity charge about 650,000 yuan for cement mill.
3, improve burnability of raw material, improve grog yield and quality
As can be seen from above testing data, with the ferromanganese slag (mixture) of part, after replacing part Wingdale and sandstone raw material, the burn-ability of material obviously improves, and the firing time of grog shortens, burn till hear rate reduces, and correspondingly improves the output of rotary kiln, simultaneously as can be seen from above testing data, with the ferromanganese slag of part, after replacing part Wingdale and sandstone raw material, the quality of grog is had no adverse effects.
4, improve into kiln rate of decomposition, reduce into kiln objectionable constituent, reduce preheater and decomposing furnace Coating clogging
Discharge through high-temperature calcination and carry out the ferromanganese slag of water quenching technology in time after fluidizing furnace process, its main component is CaO and SiO2 and other are micro-on a small quantity; They itself have had very high activity, and without the need to again decomposing, therefore, after replacing part Wingdale and sandstone raw material with the ferromanganese slag of part, raw material enter kiln rate of decomposition at least can bring up to more than 95%; Meanwhile, the K contained by the ferromanganese slag after water quenching technology and harmless treatment is also carried out in time through high-temperature calcination 2o, Na 2o, CI -, the objectionable constituent such as SO3, volatile fraction in former manganese ore enterprise produces, remains in and is all wrapped in the xln particulate of CaO and SiO2 with vitreum form in ferromanganese slag, be more just difficult to evaporate after fluidizing furnace process again; Therefore, with the ferromanganese slag (mixture) of part, after replacing part Wingdale and sandstone raw material, correspondingly just decrease into kiln objectionable constituent, reduce the chance of preheater and decomposing furnace Coating clogging, improve the operation factor of rotary kiln simultaneously.
5, Easy dosing, production control is convenient
As can be seen from above testing data, with the ferromanganese slag of part, after replacing part Wingdale and sandstone raw material, the chemical constitution of raw material is more steady, fluctuates less; Raw ingredients is stablized, and lays a solid foundation for improving rotary kiln output.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.

Claims (9)

1. utilize ferromanganese slag to prepare a method for cement, it is characterized in that: comprise the following steps:
(a) raw material crushing: to mainly consist of Wingdale, ferromanganese slag, shale, sandstone, iron ore raw material carry out fragmentation, obtain limestone particle, ferromanganese solid impurity particle, shale particle, sandstone particle, iron ore particle respectively, in raw material, the mass percent of Wingdale is 60% ~ 80%, the mass percent of ferromanganese slag is 10% ~ 20%, all the other are shale, sandstone, iron ore;
(b) raw material prehomogenization: various particles step (a) obtained carry out layering stacking;
C prepared by () raw material: adopt the mode that cuts to carry out feeding to the feed particles of stacking in step (b), carry out grinding, obtain raw material to feed particles;
(d) raw material homogenizing: adopt the mode of pneumatic blending fully to mix the raw material that step (c) obtains;
(e) pre-thermolysis: by preheater, preheating is carried out to raw material, and make raw material complete decomposed reaction;
(f) sinter leaching: the raw material completed after preheating Sum decomposition enter into rotary kiln, carry out burning till of grog;
(g) grog grinding: cooling down is carried out to the grog after burning till, then chamotte powder is milled to required granularity, completes manufacture of cement.
2. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1, it is characterized in that: the detailed process of described step (b) is: by stacker, the raw material after fragmentation is stacked by tiling, mode overlapping up and down, different raw materials is positioned at different layers, and the thickness of every one deck is even, the thickness of adjacent two layers is equal.
3. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1 and 2, it is characterized in that: the concrete operations cutting mode in described step (c) are: the direction along raw material tiling cuts the bed of material successively, when cutting at every turn, vertically cut all bed of materials from top to bottom, until take.
4. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1, is characterized in that: in described step (c), the detailed process of grinding is:
(c1) feed particles falls mill central authorities by lock feeding device through blanking scraper-trough conveyer, under the influence of centrifugal force, be thrown toward mill edge and be subject to the spreading grinding of grinding roller, the feed particles after pulverizing is overflowed from the edge of mill, is taken up oven dry by from nozzle at high speeds hot gas flow upwards;
(c2) according to the difference of gas velocity, part material particle is taken in powder separating machine by air-flow, and meal turns back on mill after being separated, grinding again; Fine powder then goes out mill with air-flow, collects, be raw material in dust arrester installation;
(c3) after the feed particles do not taken up by air-flow overflows mill, by the chapelet of outer circulation feeding powder separating machine, coarse particles falls back mill, again extrudes grinding.
5. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1, is characterized in that: the detailed process of described step (e) is:
(e1) by the raw material feeding preheater after homogenizing, raw material, under the shock action of preheater high speed upstream, move upward and are scatter;
(e2) air-flow drives raw material to enter in cyclone cylinder, be forced in the annulus between cyclone muff and inner core and do rotational flow, and rotate while move downward, by cylindrical shell to cone, the end of cone can be extended to always, then then rotate up rising, discharged by vapor pipe;
(e3) raw material after preheating enter into decomposing furnace, and in decomposing furnace, complete carbonate decomposition reaction.
6. a kind of method utilizing ferromanganese slag to prepare cement according to claim 5, is characterized in that: the detailed process of described step (f) is:
(f1) in rotary kiln, carbonate decomposes rapidly further and a series of solid state reaction occurs, and generates tricalcium aluminate, tetracalcium aluminoferrite, Dicalcium Phosphate (Feed Grade) in cement clinker;
(f2) along with temperature of charge be increased to 1300 DEG C time, tricalcium aluminate, tetracalcium aluminoferrite, Dicalcium Phosphate (Feed Grade) become liquid phase, are dissolved in Dicalcium Phosphate (Feed Grade) in liquid phase and calcium oxide and carry out reaction and generate a large amount of tricalcium silicate.
7. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1, is characterized in that: the ferromanganese slag in described step (a) is obtained by following steps:
(a1) get the ferromanganese waste residue produced in Blast Furnace Ferromanganese Manufacturing alloy process, then by itself and coal gangue in mass ratio 6:4 carry out fragmentation, and Homogeneous phase mixing, obtain mixture, the granularity of ferromanganese waste residue and coal gangue is less than or equal to 2mm;
(a2) mixture step (a1) obtained is sent in fluidizing furnace and is carried out burn processing, the air intake wind-warm syndrome at least 300 DEG C of fluidizing furnace, working temperature at least 650 DEG C, and the lime-ash obtained is required ferromanganese slag.
8. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1, is characterized in that: the kiln hood coal consumption of described rotary kiln accounts for 40% of total coal consumption, and kiln tail coal consumption accounts for 60% of total coal consumption.
9. a kind of method utilizing ferromanganese slag to prepare cement according to claim 1, it is characterized in that: the air inlet fan pressure of described rotary kiln is 5400 ~ 5500Pa, the kiln speed of rotary kiln is 3.9 ~ 4.0r/min.
CN201510595374.7A 2015-09-17 2015-09-17 Method for preparing cement from manganese iron slag Pending CN105174756A (en)

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CN107721216A (en) * 2017-08-22 2018-02-23 上海驰春节能科技有限公司 A kind of technique using molten blast furnace slag liquid phase calcination of cement clinker
CN111233353A (en) * 2020-03-13 2020-06-05 杭州富阳南方水泥有限公司 Method for producing general cement clinker by using iron oxide slag to partially replace iron correction raw material
CN112279508A (en) * 2019-07-13 2021-01-29 秦茂钊 Method for producing microcrystalline glass by electrolyzing manganese slag in harmless way

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107721216A (en) * 2017-08-22 2018-02-23 上海驰春节能科技有限公司 A kind of technique using molten blast furnace slag liquid phase calcination of cement clinker
CN112279508A (en) * 2019-07-13 2021-01-29 秦茂钊 Method for producing microcrystalline glass by electrolyzing manganese slag in harmless way
CN112279508B (en) * 2019-07-13 2023-03-24 秦茂钊 Method for producing microcrystalline glass by electrolyzing manganese slag in harmless way
CN111233353A (en) * 2020-03-13 2020-06-05 杭州富阳南方水泥有限公司 Method for producing general cement clinker by using iron oxide slag to partially replace iron correction raw material

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Application publication date: 20151223