CN104496230A - Cement clinker and preparation method thereof - Google Patents
Cement clinker and preparation method thereof Download PDFInfo
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- CN104496230A CN104496230A CN201410740011.3A CN201410740011A CN104496230A CN 104496230 A CN104496230 A CN 104496230A CN 201410740011 A CN201410740011 A CN 201410740011A CN 104496230 A CN104496230 A CN 104496230A
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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
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- 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
The invention provides a cement clinker and a preparation method thereof. The preparation method comprises the following steps: mixing high-iron bauxite powder, a carbon reductant, hydrated limes, an organic binder and water to obtain a mixture; preparing the mixture into a pellet; drying the pellet; directly carrying out reduction and melting separation on the dried pellet; cooling the pellet, and carrying out self-pulverization on the pellet to obtain powder; sieving the powder to obtain grained irons and first self-pulverized reducing slag; and carrying out magnetic separation on the first self-pulverized reducing slag to obtain grained irons and second self-pulverized reducing slag which serves as the cement clinker, wherein based on the total weight of bauxite powder, the carbon reductant and the hydrated limes, the weight percentage of the bauxite powder is 54.55-56.93 percent, the weight percentage of the carbon reductant is 10.81-11.28 percent, the weight percentage of the hydrated lime is 31.79-34.64 percent, the weight of the organic binder accounts for 2-4 percent of the total weight of the bauxite powder, the carbon reductant and the hydrated lime, and the weight of the water accounts for 7-9 percent of the total weight of the bauxite powder, the carbon reductant and the hydrated lime.
Description
Technical field
The present invention relates to the technical field of material of construction, specifically, relate to a kind of cement clinker and preparation method thereof.
Background technology
The ferriferous oxide of high swage bauxite usually containing high level.In the prior art, high swage bauxite through coal-based direct reduction to melt point can with high recovery rate obtain granulated iron and fineness minimum from efflorescence reducing slag.The granulated iron of high-quality directly can be used as the steel-making refrigerant of converter or electric furnace, and is never effectively fully utilized from efflorescence reducing slag.Such as, when adopting the aluminum oxide in efflorescence reducing slag of wet method stripping prior art, because require very harsh to the content of MgO from efflorescence reducing slag, so be difficult to obtain higher digesting efficiency of alumina.
Summary of the invention
One object of the present invention is cement clinker of at least one technical problem provided in a kind of can solving the problems of the technologies described above and preparation method thereof.
Another object of the present invention is to provide a kind of cement clinker and preparation method thereof.
The method preparing cement clinker according to the present invention comprises the steps: high swage bauxite breeze, carbonaceous reducing agent, slaked lime, organic binder bond and water to mix, to obtain compound; Compound is made pelletizing; Dry pelletizing; Molten point of direct-reduction is carried out to dried pelletizing; Cooling pelletizing, makes pelletizing from efflorescence to obtain powder; Powder is sieved, to obtain granulated iron and first from efflorescence reducing slag; And carry out magnetic separation to first from efflorescence reducing slag, using obtain granulated iron and as cement clinker second from efflorescence reducing slag, wherein, high swage bauxite breeze has the Al being not less than 20%
2o
3content, be not less than all iron content of 20% and be not less than the Al of 48%
2o
3content and Fe
2o
3content sum, based on the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, the weight percent of high swage bauxite breeze is 54.55% ~ 56.93%, the weight percent of carbonaceous reducing agent is 10.81% ~ 11.28%, the weight percent of slaked lime is 31.79% ~ 34.64%, the weight of organic binder bond is 2% ~ 4% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, and the weight of water is 7% ~ 9% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime.
According to an aspect of the present invention, the Al of high swage bauxite breeze
2o
3content and SiO
2the ratio of content is in the scope of 1.5 to 4.0.
According to an aspect of the present invention, organic binder bond is at least one in syrup, acrylamide, polyvinyl alcohol, carboxymethyl cellulose, starch, KLP pellet binder.
According to an aspect of the present invention, use ball press that compound is made pelletizing.
According to an aspect of the present invention, net belt type continuous drying case dry pelletizing 2 hours ~ 3 hours at 240 DEG C ~ 260 DEG C is used.
According to an aspect of the present invention, under protective atmosphere, at the temperature of 1400 DEG C ~ 1450 DEG C, direct-reduction is carried out to dried pelletizing and melt divisional processing.
According to an aspect of the present invention, in hyperchannel high-temperature electric heat pushed bat kiln, be under the nitrogen atmosphere of 4.0L/min ~ 6.0L/min at flow, at the temperature of 1400 DEG C ~ 1450 DEG C, direct-reduction carried out to dried pelletizing and melt divisional processing 30min ~ 40min.
According to an aspect of the present invention, low intensity magnetic separation is carried out to first from efflorescence reducing slag.
According to the thing phase composite of cement clinker of the present invention comprise the Dicalcium Phosphate (Feed Grade) of 26.32% ~ 29.03% by weight, the C 12 A 7 of 58.63% ~ 66.67% and 6.67% ~ 15.05% gehlenite, the chemical constitution of described cement clinker comprises the Al of by weight 29.82% ~ 31.91%
2o
3, 13.39% ~ 14.35% SiO
2, 53.74% ~ 56.81% CaO, be no more than 2.0% FeO and lower than 1.5% metallic iron.
The thing phase composite of the cement clinker prepared according to aforesaid method comprise the Dicalcium Phosphate (Feed Grade) of 26.32% ~ 29.03% by weight, the C 12 A 7 of 58.63% ~ 66.67% and 6.67% ~ 15.05% gehlenite, the chemical constitution of described cement clinker comprises the Al of by weight 29.82% ~ 31.91%
2o
3, 13.39% ~ 14.35% SiO
2, 53.74% ~ 56.81% CaO, be no more than 2.0% FeO and lower than 1.5% metallic iron.
Accompanying drawing explanation
By the description to embodiment carried out below in conjunction with accompanying drawing, above-mentioned and/or other object of the present invention and advantage will become apparent, wherein:
Fig. 1 shows according to the process flow sheet preparing the method for cement clinker of the present invention;
Fig. 2 be in embodiment 2 preparation as cement clinker second from the figure of the XRD analysis result of efflorescence reducing slag;
(a), (b) and (c) in Fig. 3 to show in embodiment 1 to embodiment 3 preparation as cement clinker second from the photo of efflorescence reducing slag.
Embodiment
Below in conjunction with accompanying drawing, cement clinker according to the present invention and preparation method thereof is described in detail.But, the present invention can embody in many different forms, and should not be construed as limited to specific embodiment set forth herein, on the contrary, there is provided these embodiments to make the present invention to be thoroughly with complete, and scope of the present invention will be passed on fully to those skilled in the art.
Fig. 1 shows according to the process flow sheet preparing the method for cement clinker of the present invention.With reference to Fig. 1, the method preparing cement clinker according to the present invention comprises: mix, high swage bauxite breeze, carbonaceous reducing agent, slaked lime, organic binder bond and water to obtain compound; Compound is made pelletizing; Dry pelletizing; Molten point of direct-reduction is carried out to dried pelletizing; Cooling pelletizing, makes pelletizing from efflorescence to obtain powder; Powder is sieved, to obtain granulated iron and first from efflorescence reducing slag; And carry out magnetic separation to first from efflorescence reducing slag, using obtain granulated iron and as cement clinker second from efflorescence reducing slag.
The high swage bauxite breeze used in the method for cement clinker of preparing according to the present invention can have the Al being not less than 20% (such as, 20% ~ 30%)
2o
3content, be not less than full iron (TFe) content of 20% (such as, 25% ~ 35%) and be not less than the Al of 48%
2o
3content and Fe
2o
3content sum.In addition, the Al of high swage bauxite breeze
2o
3content (weight) and SiO
2the ratio (A/S) of content (weight) can in the scope of 1.5 to 4.0, more specifically, and can in the scope of 1.9 to 2.4.The SiO of high swage bauxite breeze
2content can be 10% ~ 15%.High swage bauxite breeze also can containing other a small amount of metal oxides, such as TiO
2, K
2o, Na
2o, CaO, MgO etc.Such as, high swage bauxite breeze can contain the CaO of 0.98%-1.38%.But, the present invention is not limited thereto, according to using any suitable high swage bauxite breeze of the present invention preparation in the method for cement clinker.
In a particular application, the high swage bauxite breeze that the ground such as the ground such as the Guigang of Guangxi China, Heng County, Binyang, guest, Wuming and Shanxi Baode, Henan, Guizhou, Chongqing, Hainan, Fujian produces can be used.
In one exemplary embodiment of the present invention, the granularity of high swage bauxite breeze can be 60 order ~ 120 orders.But the method preparing cement clinker according to the present invention is not limited thereto.
The carbonaceous reducing agent used in the method for cement clinker of preparing according to the present invention can be at least one in coal dust, powdered carbon and coke powder.Carbonaceous reducing agent can have 60 order ~ 120 object granularities.But the method preparing cement clinker according to the present invention is not limited thereto.
The organic binder bond used in the method for cement clinker of preparing according to the present invention can be any suitable organic binder bond that field of metallurgy is commonly used.Such as, at least one in syrup, acrylamide, polyvinyl alcohol, carboxymethyl cellulose, starch, KLP pellet binder can be used as organic binder bond.In one exemplary embodiment, use syrup as organic binder bond.Because the use of such as bentonitic mineral binder bond can change the composition of reducing slag, thus making the physicochemical property deterioration of reducing slag, so according to using organic binder bond of the present invention preparation in the method for cement clinker, and not using mineral binder bond.
The slaked lime used in the method for cement clinker of preparing according to the present invention not only can provide a large amount of calcium constituents in final product-cement clinker, and plays the effect reducing slag system fusing point, thus the reduction being conducive to ferriferous oxide is separated with the effective of slag iron.In addition, slaked lime also can be used as the binding agent of pelletizing.The fineness of slaked lime is not particularly limited.
Preparing in the method for cement clinker according to of the present invention, if use calcium oxide to replace slaked lime, then calcium oxide chance water can expand, and causes pelletizing undried and reduction just efflorescence to occur.If use calcium chloride to replace slaked lime, be separated although calcium chloride is conducive to fusing, can cause occurring glassy phase in reducing slag, and then cause reducing slag can not from efflorescence.If use calcium sulfate to replace slaked lime, then the sulphur content in granulated iron can be caused to exceed standard, and contaminate environment.Therefore, according to using slaked lime of the present invention preparation in the method for cement clinker.
Based on the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, the weight percent of high swage bauxite breeze can be 54.55% ~ 56.93%, the weight percent of carbonaceous reducing agent can be 10.81% ~ 11.28%, and the weight percent of slaked lime can be 31.79% ~ 34.64%.
If the weight percent of high swage bauxite breeze is less than 54.55%, then the basicity of reducing slag can be caused to raise, affect reducing slag composition, reduce the Dicalcium Phosphate (Feed Grade) (C in reducing slag
2and C 12 A 7 (C S)
12a
7) content, the final hydration and hardening intensity reducing cement clinker.If the weight percent of high swage bauxite breeze is greater than 56.93%, the basicity of reducing slag can be caused to reduce, affect reducing slag composition, reduce the C in reducing slag
2s and C
12a
7content, increases the content of gehlenite simultaneously, and this composition almost can not hydration and hardening, finally the hydration and hardening intensity of reduction cement clinker.
If the weight percent of carbonaceous reducing agent is less than 10.81%, then the reduction of ferriferous oxide can be caused insufficient, make iron recovery low; Cause the iron level in reducing slag to raise simultaneously, cement clinker is had an impact, such as, can reduce strength of cement.If the weight percent of carbonaceous reducing agent is greater than 11.28%, then carbon content can be caused too much to make reduction energy consumption raise.
If the weight percent of slaked lime is less than 31.79%, the basicity of reducing slag can be caused to reduce, affect reducing slag composition, reduce the C in reducing slag
2s and C
12a
7content, increases the content of gehlenite simultaneously, and this composition almost can not hydration and hardening, finally the hydration and hardening intensity of reduction cement clinker.If the weight percent of slaked lime is greater than 34.64%, then the basicity of reducing slag can be caused to raise, affect reducing slag composition, reduce the C in reducing slag
2s and C
12a
7content, the final hydration and hardening intensity reducing cement clinker.
The weight of organic binder bond is 2% ~ 4% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime.If the weight of organic binder bond is less than 2% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, then can cause the lower compressive strength of the follow-up pelletizing be pressed into.If the weight of organic binder bond is greater than 4% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, then can cause demoulding difficulty in the process of follow-up pressed pellet, adding too much organic binder bond can increase cement clinker production cost and energy consumption simultaneously.
The weight of water is 7% ~ 9% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime.If the weight of water is less than 7% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, then can cause the lower compressive strength of the follow-up pelletizing be pressed into.If the weight of water is greater than 9% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, then can cause being pressed into demoulding difficulty in the process of pelletizing.
In a preferred exemplary embodiment, high swage bauxite breeze, carbonaceous reducing agent, slaked lime, organic binder bond and water are mixed to obtain compound equably.In one exemplary embodiment, first high swage bauxite breeze, carbonaceous reducing agent and slaked lime can be mixed, then organic binder bond He Shui be mixed with the compound of high swage bauxite breeze, carbonaceous reducing agent and slaked lime.
Can adopt any suitable equipment in this area that compound is made pelletizing.In one exemplary embodiment, use ball press (such as roll type ball press) that compound is made pelletizing.In a concrete exemplary embodiment, roll type ball press is used with suitable pressure, compound to be pressed into the pelletizing with suitable dimension.Pressure for suppressing compound is not particularly limited, such as, be 10MPa ~ 60MPa.The shape of the pelletizing made is not particularly limited, such as, be spherical, elliposoidal, flat, cuboid, the square bodily form, cylindrical, wedge shape, olive shape, irregularly shaped etc.The size of the pelletizing made is not particularly limited, the pelletizing that such as size (diameter, length, width, span etc.) is 10mm ~ 100mm.
The pelletizing that obtains of ball press is used to have good physical strength good in efflorescence effect to guarantee.But, if the balling disc using field of metallurgy conventional or drum pelletizer, then the physical strength of obtained pelletizing may too low impact from efflorescence effect, and pelletizing size is less, during reduction, burner hearth utilization ratio is low to make reduction energy consumption raise, and the granulated iron size of producing is little.Therefore, in a preferred exemplary embodiment, use ball press that compound is made pelletizing.
Any suitable drying plant in this area can be used to carry out drying to pelletizing.In one exemplary embodiment, net belt type continuous drying case is used to carry out dry pelletizing.Temperature for dry pelletizing is not particularly limited, such as, be 240 DEG C ~ 260 DEG C.Time for dry pelletizing is not particularly limited, such as, be 2 hours ~ 3 hours.
The operation that any suitable equipment in this area to melt point to perform direct-reduction can be adopted.In one exemplary embodiment, under protective atmosphere, at the temperature of 1400 DEG C ~ 1450 DEG C, direct-reduction is carried out to dried pelletizing and melt divisional processing.Protective atmosphere can be inert gas atmosphere or nitrogen atmosphere.If the temperature melted point for direct-reduction is lower than 1400 DEG C, then the ferric oxide that may not reduce fully in high swage bauxite is to form granulated iron and slag.If the temperature melted point for direct-reduction is higher than 1450 DEG C, then the mobility of pelletizing may be caused excessive, and can cause reducing slag and molten metal trickling, bonding direct-reduction melts the bottom of subset, thus can not form granulated iron.
In one exemplary embodiment, use hyperchannel high-temperature electric heat pushed bat kiln to carry out direct-reduction to dried pelletizing and melt divisional processing.In a concrete exemplary embodiment, in hyperchannel high-temperature electric heat pushed bat kiln, under flow is the nitrogen atmosphere of 4.0L/min ~ 6.0L/min, at the temperature of 1400 DEG C ~ 1450 DEG C, direct-reduction can be carried out to dried pelletizing and melts divisional processing 30min ~ 40min.
In the process that direct-reduction melts point, the ferriferous oxide at least partially in high swage bauxite is become metallic iron by carbonaceous reducing agent.In addition, metallic iron carburizing is melted gradually, and agglomeration becomes large granulated iron, and reducing slag does not then thoroughly melt, but mobility is less but can be ensured that granulated iron trickles smoothly to reducing slag congregate and become large-sized granulated iron.Therefore, being separated at least in part of granulated iron and reducing slag is achieved.As mentioned above, if the temperature melted point for direct-reduction is higher than 1450 DEG C, then mobility may be caused excessive, and can cause reducing slag and molten metal trickling, bonding direct-reduction melts the bottom of subset, thus can not form granulated iron.
Pelletizing after direct-reduction melts point is cooled, and makes pelletizing from efflorescence to obtain powder.Can according to the mode of naturally cooling and accelerating cooling cool direct-reduction to melt point after pelletizing.This cooling can be performed in atmosphere or under protective atmosphere.
In process of cooling, due to the Dicalcium Phosphate (Feed Grade) (C in reducing slag
2s) Volumetric expansion, cause reducing slag from efflorescence, and then cause whole pelletizing from efflorescence, thus obtain powder.In one exemplary embodiment, pelletizing can close to 100% from Pulverization ratio, and the ratio of the fineness of powder more than 60 orders is the highest can reach 98.51%.Therefore, without the need to carrying out break process in order to separating reducing slag and granulated iron to powder, thus save energy consumption and simplify technical process.
Any suitable screening plant in this area can be used to sieve powder, to obtain granulated iron and first from efflorescence reducing slag.In one exemplary embodiment, vibratory screening apparatus can be used to sieve powder.In a concrete exemplary embodiment, powder can be joined fineness is 80 object vibratory screening apparatuss carry out screening to be separated, being effectively separated from efflorescence reducing slag and granulated iron of the overwhelming majority (such as, 96.34% ~ 98.51%) can be realized with this.Term used herein " first ", " second " etc. are only convenient to for distinguishing different material describe, and are not intended to limit the present invention.
Any suitable magnetic plant in this area can be used to carry out magnetic separation to first from efflorescence reducing slag, using obtain granulated iron and as cement clinker second from efflorescence reducing slag.In one exemplary embodiment, can carry out low intensity magnetic separation to first from efflorescence reducing slag, such as, be carry out low intensity magnetic separation to first from efflorescence reducing slag under the condition of 0.16T at magnetic induction density.Second FeO content in efflorescence reducing slag and metal Ferrum content few, such as, the weight percentage of FeO can be no more than 2.0% (such as, in the scope of 1.2% ~ 2.0%), metal Ferrum content can lower than 1.5% (such as, in the scope of 0.1% ~ 1.2%).
Dicalcium Phosphate (Feed Grade) (C is mainly comprised from the thing phase composite of efflorescence reducing slag as second of cement clinker
2and C 12 A 7 (C S)
12a
7).In one exemplary embodiment, to comprise the C of by weight 26.32% ~ 29.03% from the thing phase composite of efflorescence reducing slag as second of cement clinker
2s, 58.63% ~ 66.67% C
12a
7with 6.67% ~ 15.05% gehlenite (C
2aS).C
2the hydration heat of S is lower, and aquation intensity is the strongest, but hydration rate is slower; C
12a
7hydration rate the fastest, aquation intensity is relatively weak, and hydration heat is comparatively moderate.
The Al of by weight 29.82% ~ 31.91% can be comprised from the chemical constitution of efflorescence reducing slag as second of cement clinker
2o
3, 13.39% ~ 14.35% SiO
2with 53.74% ~ 56.81% CaO.
In addition, high specific surface area can be had as second of cement clinker from efflorescence reducing slag, such as, 738m
2/ kg ~ 756m
2/ kg.
Therefore, second can be widely used as the additive of cement from efflorescence reducing slag, can reduce cement calorific value, improves the setting rate of cement, improves the early stage of cement and later strength.In one exemplary embodiment, for as cement clinker second from efflorescence reducing slag, the aquation calorific value of maintenance after 56 days is 26.8cal/g ~ 35.7cal/g, and the presetting period is 125min ~ 165min, and final setting time is 200min ~ 235min.Realize cement calorific value, setting rate, initial set and final setting time and control that is early stage and later strength from the thing phase composite of efflorescence reducing slag and/or chemical constitution as second of cement clinker by adjustment.Can by regulate the composition of pelletizing and/or processing condition adjust as cement clinker second from the thing phase composite of efflorescence reducing slag and/or chemical constitution.
In addition, the method preparing cement clinker according to the present invention can process low alumina-silica ratio type difficulty and select high-iron bauxite, can realize metallic iron and the comprehensive utilization from efflorescence reducing slag.
In addition, the method preparing cement clinker according to the present invention passes through the composition and/or the processing condition that control pelletizing, what make pelletizing can close to 100% from Pulverization ratio, and the ratio of the fineness of powder more than 60 orders is the highest can reach 98.51%, therefore without the need to carrying out break process in order to separating reducing slag and granulated iron to powder, thus save energy consumption and simplify technical process.
In addition, the method preparing cement clinker according to the present invention have simple to operate, energy consumption is low, production efficiency advantages of higher.
In addition, the method preparing cement clinker according to the present invention can obtain very high iron recovery, the iron recovery of such as more than 95%.
Below in conjunction with specific embodiment, the method preparing cement clinker according to the present invention is described in more detail.(a), (b) and (c) in Fig. 3 to respectively illustrate in embodiment 1 to embodiment 3 preparation as cement clinker second from the photo of efflorescence reducing slag.
embodiment 1
Be 30.03% by Iron grade, aluminum oxide grade be 25.84%, A/S be 2.38 high swage bauxite and hard coal to be milled to granularity be 60 ~ 120 orders.Based on the gross weight 100% of high swage bauxite breeze, hard coal and slaked lime, the high swage bauxite breeze of 56.93%, the pulverized anthracite of 11.28%, the slaked lime of 31.79% are mixed.Based on the gross weight of high swage bauxite breeze, hard coal and slaked lime, the industrial syrup of the water of 7% and 4% is joined in the mixture of high swage bauxite breeze, hard coal and slaked lime, mixes to obtain compound.With belt, compound is sent into roll type ball press and carry out pressure ball, with the obtained elliposoidal pelletizing being of a size of φ 40mm (major diameter) × 30mm (minor axis).To be sent in net belt type continuous drying case by pelletizing with belt and dry, bake out temperature is 240 DEG C, and drying time is 2 hours.After oven dry terminates, pelletizing is sent in hyperchannel high-temperature electric heat pushed bat kiln; pass into flow be the nitrogen of 4.0L/min as the condition of shielding gas under carry out molten point of high-temperature direct reduction; the temperature that direct-reduction melts point is 1400 DEG C, and the time that direct-reduction melts point is 30min.After molten point of direct-reduction terminates, pelletizing is cooled to envrionment temperature under air cooling condition, and in the process of this air cooling, pelletizing occurs from powder phenomenon-tion, thus obtains powder.Powder being sent into fineness is that 80 object vibratory screening apparatuss sieve, and achieves 96.34% be separated with the effective of granulated iron from efflorescence reducing slag, thus obtains granulated iron and first from efflorescence reducing slag.First in efflorescence reducing slag the weight percentage of FeO be 3.43%, the weight percent of metallic iron is 2.14%.Under efflorescence reducing slag at magnetic induction density is the condition of 0.16T, carry out low intensity magnetic separation deironing by first, thus obtain granulated iron and as cement clinker second from efflorescence reducing slag.
Second comprises the Al of 31.91% by weight from the chemical constitution of efflorescence reducing slag
2o
3, 14.35% SiO
2, the CaO of 53.74%, the FeO of 1.91% and 0.12% metallic iron.Second comprises the C of 26.32% by weight from the thing phase composite of efflorescence reducing slag
2s, 58.63% C
12a
7and the C of 15.05%
2aS.In addition, second is 738m from the specific surface area of efflorescence reducing slag
2/ kg.
embodiment 2
Be 30.82% by Iron grade, aluminum oxide grade be 24.32%, A/S be 1.98 high swage bauxite and hard coal to be milled to granularity be 60 ~ 120 orders.Based on the gross weight 100% of high swage bauxite breeze, hard coal and slaked lime, the high swage bauxite breeze of 55.71%, the pulverized anthracite of 11.04%, the slaked lime of 33.25% are mixed.Based on the gross weight of high swage bauxite breeze, hard coal and slaked lime, the industrial syrup of the water of 8% and 3% is joined in the mixture of high swage bauxite breeze, hard coal and slaked lime, mixes to obtain compound.With belt, compound is sent into roll type ball press and carry out pressure ball, with the obtained elliposoidal pelletizing being of a size of φ 40mm (major diameter) × 30mm (minor axis).To be sent in net belt type continuous drying case by pelletizing with belt and dry, bake out temperature is 250 DEG C, and drying time is 2.5 hours.After oven dry terminates, pelletizing is sent in hyperchannel high-temperature electric heat pushed bat kiln; pass into flow be the nitrogen of 5.0L/min as the condition of shielding gas under carry out molten point of high-temperature direct reduction; the temperature that direct-reduction melts point is 1425 DEG C, and the time that direct-reduction melts point is 35min.After molten point of direct-reduction terminates, pelletizing is cooled to envrionment temperature under air cooling condition, and in the process of this air cooling, pelletizing occurs from powder phenomenon-tion, thus obtains powder.Powder being sent into fineness is that 80 object vibratory screening apparatuss sieve, and achieves 97.98% be separated with the effective of granulated iron from efflorescence reducing slag, thus obtains granulated iron and first from efflorescence reducing slag.Under efflorescence reducing slag at magnetic induction density is the condition of 0.16T, carry out low intensity magnetic separation deironing by first, thus obtain granulated iron and as cement clinker second from efflorescence reducing slag.
Second comprises the Al of 30.82% by weight from the chemical constitution of efflorescence reducing slag
2o
3, 13.85% SiO
2, the CaO of 55.33%, the FeO of 1.33% and 1.04% metallic iron.Second comprises the C of 28.89% by weight from the thing phase composite of efflorescence reducing slag
2s, 64.44% C
12a
7and the C of 6.67%
2aS.In addition, second is 751m from the specific surface area of efflorescence reducing slag
2/ kg.
Fig. 2 to show in embodiment 2 preparation as cement clinker second from the XRD analysis result of efflorescence reducing slag.
embodiment 3
Be 28.21% by Iron grade, aluminum oxide grade be 26.46%, A/S be 2.25 high swage bauxite and hard coal to be milled to granularity be 60 ~ 120 orders.Based on the gross weight 100% of high swage bauxite breeze, hard coal and slaked lime, the high swage bauxite breeze of 54.55%, the pulverized anthracite of 10.81%, the slaked lime of 34.64% are mixed.Based on the gross weight of high swage bauxite breeze, hard coal and slaked lime, the industrial syrup of the water of 9% and 2% is joined in the mixture of high swage bauxite breeze, hard coal and slaked lime, mixes to obtain compound.With belt, compound is sent into roll type ball press and carry out pressure ball, with the obtained elliposoidal pelletizing being of a size of φ 40mm (major diameter) × 30mm (minor axis).To be sent in net belt type continuous drying case by pelletizing with belt and dry, bake out temperature is 260 DEG C, and drying time is 3 hours.After oven dry terminates, pelletizing is sent in hyperchannel high-temperature electric heat pushed bat kiln; pass into flow be the nitrogen of 6.0L/min as the condition of shielding gas under carry out molten point of high-temperature direct reduction; the temperature that direct-reduction melts point is 1450 DEG C, and the time that direct-reduction melts point is 40min.After molten point of direct-reduction terminates, pelletizing is cooled to envrionment temperature under air cooling condition, and in the process of this air cooling, pelletizing occurs from powder phenomenon-tion, thus obtains powder.Powder being sent into fineness is that 80 object vibratory screening apparatuss sieve, and achieves 98.51% be separated with the effective of granulated iron from efflorescence reducing slag, thus obtains granulated iron and first from efflorescence reducing slag.Under efflorescence reducing slag at magnetic induction density is the condition of 0.16T, carry out low intensity magnetic separation deironing by first, thus obtain granulated iron and as cement clinker second from efflorescence reducing slag.
Second comprises the Al of 29.82% by weight from the chemical constitution of efflorescence reducing slag
2o
3, 13.39% SiO
2, the CaO of 56.81%, the FeO of 1.31% and 1.13% metallic iron.Second comprises the C of 29.03% by weight from the thing phase composite of efflorescence reducing slag
2s, 63.44% C
12a
7and the C of 7.53%
2aS.In addition, second is 756m from the specific surface area of efflorescence reducing slag
2/ kg.
More than describe the preferred embodiment of the present invention in detail, but the present invention is not limited to the detail in above-mentioned embodiment.Within the scope of technical conceive of the present invention, can carry out multiple simple variant and combination to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (10)
1. prepare a method for cement clinker, it is characterized in that comprising the steps:
High swage bauxite breeze, carbonaceous reducing agent, slaked lime, organic binder bond and water are mixed, to obtain compound;
Compound is made pelletizing;
Dry pelletizing;
Molten point of direct-reduction is carried out to dried pelletizing;
Cooling pelletizing, makes pelletizing from efflorescence to obtain powder;
Powder is sieved, to obtain granulated iron and first from efflorescence reducing slag; And
Carry out magnetic separation to first from efflorescence reducing slag, using obtain granulated iron and as cement clinker second from efflorescence reducing slag,
Wherein, high swage bauxite breeze has the Al being not less than 20%
2o
3content, be not less than all iron content of 20% and be not less than the Al of 48%
2o
3content and Fe
2o
3content sum,
Based on the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime, the weight percent of high swage bauxite breeze is 54.55% ~ 56.93%, the weight percent of carbonaceous reducing agent is 10.81% ~ 11.28%, and the weight percent of slaked lime is 31.79% ~ 34.64%
The weight of organic binder bond is 2% ~ 4% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime,
The weight of water is 7% ~ 9% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime.
2. method according to claim 1, is characterized in that, the Al of high swage bauxite breeze
2o
3content and SiO
2the ratio of content is in the scope of 1.5 to 4.0.
3. method according to claim 1, is characterized in that, organic binder bond is at least one in syrup, acrylamide, polyvinyl alcohol, carboxymethyl cellulose, starch, KLP pellet binder.
4. method according to claim 1, is characterized in that, uses ball press that compound is made pelletizing.
5. method according to claim 1, is characterized in that, uses net belt type continuous drying case dry pelletizing 2 hours ~ 3 hours at 240 DEG C ~ 260 DEG C.
6. method according to claim 1, is characterized in that, carries out direct-reduction melt divisional processing under protective atmosphere at the temperature of 1400 DEG C ~ 1450 DEG C to dried pelletizing.
7. method according to claim 6, it is characterized in that, in hyperchannel high-temperature electric heat pushed bat kiln, be under the nitrogen atmosphere of 4.0L/min ~ 6.0L/min at flow, at the temperature of 1400 DEG C ~ 1450 DEG C, direct-reduction carried out to dried pelletizing and melt divisional processing 30min ~ 40min.
8. method according to claim 1, is characterized in that, carries out low intensity magnetic separation to first from efflorescence reducing slag.
9. a cement clinker, it is characterized in that, the thing phase composite of described cement clinker comprise the Dicalcium Phosphate (Feed Grade) of 26.32% ~ 29.03% by weight, the C 12 A 7 of 58.63% ~ 66.67% and 6.67% ~ 15.05% gehlenite, the chemical constitution of described cement clinker comprises the Al of by weight 29.82% ~ 31.91%
2o
3, 13.39% ~ 14.35% SiO
2, 53.74% ~ 56.81% CaO, be no more than 2.0% FeO and lower than 1.5% metallic iron.
10. the cement clinker prepared of method according to claim 1, it is characterized in that, the thing phase composite of described cement clinker comprise the Dicalcium Phosphate (Feed Grade) of 26.32% ~ 29.03% by weight, the C 12 A 7 of 58.63% ~ 66.67% and 6.67% ~ 15.05% gehlenite, the chemical constitution of described cement clinker comprises the Al of by weight 29.82% ~ 31.91%
2o
3, 13.39% ~ 14.35% SiO
2, 53.74% ~ 56.81% CaO, be no more than 2.0% FeO and lower than 1.5% metallic iron.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950860A (en) * | 2016-05-05 | 2016-09-21 | 江苏省冶金设计院有限公司 | Pelletizing method for high-iron bauxite ore |
| CN106635218A (en) * | 2016-12-14 | 2017-05-10 | 赵辉 | Industrial powder type coal binder |
| CN108975736A (en) * | 2018-08-16 | 2018-12-11 | 山东大学 | A kind of method that electric heating roller kilns fire sulphate aluminium cement |
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| CN101434403A (en) * | 2008-12-16 | 2009-05-20 | 重庆市博赛矿业（集团）有限公司 | Novel method for processing calx sodica sintered alumina by dry method |
| CN102584045A (en) * | 2012-02-01 | 2012-07-18 | 天津中材工程研究中心有限公司 | Active belite-sulphate aluminum cement clinker and preparation method for active belite-sulphate aluminum cement clinker |
| CN102618685A (en) * | 2011-01-26 | 2012-08-01 | 姜洪金 | Energy-saving environmental-protection two-grinding one-burning method iron ore cokeless iron making and cement clinker producing technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101434403A (en) * | 2008-12-16 | 2009-05-20 | 重庆市博赛矿业（集团）有限公司 | Novel method for processing calx sodica sintered alumina by dry method |
| CN102618685A (en) * | 2011-01-26 | 2012-08-01 | 姜洪金 | Energy-saving environmental-protection two-grinding one-burning method iron ore cokeless iron making and cement clinker producing technology |
| CN102584045A (en) * | 2012-02-01 | 2012-07-18 | 天津中材工程研究中心有限公司 | Active belite-sulphate aluminum cement clinker and preparation method for active belite-sulphate aluminum cement clinker |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105950860A (en) * | 2016-05-05 | 2016-09-21 | 江苏省冶金设计院有限公司 | Pelletizing method for high-iron bauxite ore |
| CN106635218A (en) * | 2016-12-14 | 2017-05-10 | 赵辉 | Industrial powder type coal binder |
| CN108975736A (en) * | 2018-08-16 | 2018-12-11 | 山东大学 | A kind of method that electric heating roller kilns fire sulphate aluminium cement |
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| Publication number | Publication date |
|---|---|
| CN104496230B (en) | 2017-01-04 |
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