CN104496230B - Clinker and preparation method thereof - Google Patents
Clinker and preparation method thereof Download PDFInfo
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- CN104496230B CN104496230B CN201410740011.3A CN201410740011A CN104496230B CN 104496230 B CN104496230 B CN 104496230B CN 201410740011 A CN201410740011 A CN 201410740011A CN 104496230 B CN104496230 B CN 104496230B
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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
Abstract
Provide a kind of clinker and preparation method thereof.This preparation method includes: high swage bauxite breeze, carbonaceous reducing agent, slaked lime, organic binder bond and water are mixed, to obtain compound；Compound is made pelletizing；It is dried pelletizing；Dried pelletizing is carried out molten point of direct-reduction；Cooling pelletizing so that 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 clinker second from efflorescence reducing slag, wherein, based on bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime, the percentage by weight of bauxite breeze is 54.55%～56.93%, the percentage by weight of carbonaceous reducing agent is 10.81%～11.28%, the percentage by weight of slaked lime is 31.79%～34.64%, the weight of organic binder bond is bauxite breeze, the 2%～4% of the gross weight of carbonaceous reducing agent and slaked lime, the weight of water is bauxite breeze, the 7%～9% of the gross weight of carbonaceous reducing agent and slaked lime.
Description
Technical field
The present invention relates to the technical field of construction material, specifically, relate to a kind of clinker and system thereof
Preparation Method.
Background technology
High swage bauxite usually contains the iron oxides of high level.In the prior art, high swage aluminum
Tu Kuang through coal-based direct reduction melt point can with high recovery rate obtain granulated iron and fineness minimum from efflorescence
Reducing slag.The granulated iron of high-quality can be directly used as the steel-making coolant of converter or electric furnace, and from efflorescence also
Former slag is the most effectively comprehensively utilized.Such as, use wet method dissolution prior art from efflorescence
During aluminium oxide in reducing slag, because to requiring the harshest from the content of MgO of efflorescence reducing slag, so
The digesting efficiency of alumina that very difficult acquisition is higher.
Summary of the invention
It is an object of the present invention to provide a kind of at least one skill that can solve the problem that in above-mentioned technical problem
Clinker of art problem and preparation method thereof.
Another object of the present invention is to provide a kind of clinker and preparation method thereof.
The method preparing clinker according to the present invention comprise the steps: by high swage bauxite breeze,
Carbonaceous reducing agent, slaked lime, organic binder bond and water mixing, to obtain compound；Compound is made
Pelletizing；It is dried pelletizing；Dried pelletizing is carried out molten point of direct-reduction；Cooling pelletizing so that pelletizing
From efflorescence to obtain powder；Powder is sieved, to obtain granulated iron and first from efflorescence reducing slag；With
And carry out magnetic separation to first from efflorescence reducing slag, using obtain granulated iron and as clinker second from efflorescence
Reducing slag, wherein, high swage bauxite breeze has the Al being not less than 20%2O3Content, it is not less than 20%
All iron content and be not less than 48% Al2O3Content and Fe2O3Content sum, based on high swage alum clay
The gross weight of ore deposit breeze, carbonaceous reducing agent and slaked lime, the percentage by weight of high swage bauxite breeze is
54.55%～56.93%, the percentage by weight of carbonaceous reducing agent is 10.81%～11.28%, the weight of slaked lime
Percentage ratio is 31.79%～34.64%, the weight of organic binder bond be high swage bauxite breeze, carbonaceous also
The 2%～4% of the gross weight of former dose and slaked lime, the weight of water is high swage bauxite breeze, carbonaceous reduction
The 7%～9% of the gross weight of agent and slaked lime.
According to an aspect of the present invention, the Al of high swage bauxite breeze2O3Content and SiO2The ratio of content
In the range of 1.5 to 4.0.
According to an aspect of the present invention, organic binder bond is syrup, acrylamide, polyvinyl alcohol, carboxylic first
At least one in base 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 oven drying case dry ball at 240 DEG C～260 DEG C is used
Group 2 hours～3 hours.
According to an aspect of the present invention, under protective atmosphere at a temperature of 1400 DEG C～1450 DEG C to be dried
After pelletizing carry out being reduced directly molten divisional processing.
According to an aspect of the present invention, in multichannel high-temperature electric heat pushed bat kiln, at flow it is
Under the nitrogen atmosphere of 4.0L/min～6.0L/min, to dried ball at a temperature of 1400 DEG C～1450 DEG C
Group carries out being reduced directly molten 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.
The thing phase composition of the clinker according to the present invention includes the silicic acid of by weight 26.32%～29.03%
The C 12 A 7 of dicalcium, 58.63%～66.67% and the cacoclasite of 6.67%～15.05%, described
The chemical composition of clinker includes the Al of by weight 29.82%～31.91%2O3, 13.39%～14.35%
SiO2, 53.74%～the CaO of 56.81%, FeO less than 2.0% and the metallic iron less than 1.5%.
The thing phase composition of the clinker prepared according to said method includes by weight 26.32%～29.03%
The C 12 A 7 of dicalcium silicate, 58.63%～66.67% and the cacoclasite of 6.67%～15.05%,
The chemical composition of described clinker includes the Al of by weight 29.82%～31.91%2O3、
The SiO of 13.39%～14.35%2, 53.74%～the CaO of 56.81%, FeO less than 2.0% and less than 1.5%
Metallic iron.
Accompanying drawing explanation
By the description to embodiment carried out below in conjunction with the accompanying drawings, above-mentioned and/or other purpose of the present invention
Will become apparent with advantage, wherein:
Fig. 1 shows the process chart of the method preparing clinker according to the present invention；
Fig. 2 be in embodiment 2 preparation divide from the XRD of efflorescence reducing slag as the second of clinker
The figure of analysis result；
(a), (b) and (c) in Fig. 3 shows the conduct of preparation in embodiment 1 to embodiment 3
The second of clinker is from the photo of efflorescence reducing slag.
Detailed description of the invention
Below in conjunction with accompanying drawing, 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 being limited at this
The specific embodiment illustrated, on the contrary, it is provided that these embodiments make the present invention to be thoroughly with complete,
And the scope of the present invention will be passed on fully to those skilled in the art.
Fig. 1 shows the process chart of the method preparing clinker according to the present invention.With reference to figure
1, include according to the method preparing clinker of the present invention: by high swage bauxite breeze, carbonaceous reduction
Agent, slaked lime, organic binder bond and water mixing, to obtain compound；Compound is made pelletizing；Dry
Dry pelletizing；Dried pelletizing is carried out molten point of direct-reduction；Cooling pelletizing so that pelletizing from efflorescence with
Obtain powder；Powder is sieved, to obtain granulated iron and first from efflorescence reducing slag；And to first
Carry out magnetic separation from efflorescence reducing slag, using obtain granulated iron and as clinker second from efflorescence reducing slag.
High swage bauxite breeze according to using in the method preparing clinker of the present invention can have not
Al less than 20% (such as, 20%～30%)2O3Content, it is not less than 20% (such as, 25%～35%)
Full ferrum (TFe) content and be not less than 48% Al2O3Content and Fe2O3Content sum.Additionally,
The Al of high swage bauxite breeze2O3Content (weight) and SiO2The ratio (A/S) of content (weight) can
With in the range of 1.5 to 4.0, more specifically, can be in the range of 1.9 to 2.4.High swage aluminum
The SiO of soil ore deposit breeze2Content can be 10%～15%.High swage bauxite breeze also can contain a small amount of its
His metal-oxide, such as TiO2、K2O、Na2O, CaO, MgO etc..Such as, high swage alum clay
Ore deposit breeze can be containing the CaO of 0.98%-1.38%.But, the invention is not restricted to this, according to the present invention
The method preparing clinker in can use any suitable high swage bauxite breeze.
In a particular application, it is possible to use the Guigang of Guangxi China, Heng County, Binyang, guest, Wuming etc.
The high swage bauxite that the ground such as ground and Shanxi Baode, Henan, Guizhou, Chongqing, Hainan, Fujian produce
Breeze.
In one exemplary embodiment of the present invention, the granularity of high swage bauxite breeze can be 60
Mesh～120 mesh.But, it is not limited to this according to the method preparing clinker of the present invention.
Carbonaceous reducing agent according to using in the method preparing clinker of the present invention can be coal dust, charcoal
At least one in powder and coke powder.Carbonaceous reducing agent can have 60 mesh～the granularity of 120 mesh.But, root
It is not limited to this according to the method preparing clinker of the present invention.
Organic binder bond according to using in the method preparing clinker of the present invention can be field of metallurgy
Conventional any suitable organic binder bond.It is, for example possible to use syrup, acrylamide, polyvinyl alcohol,
At least one in carboxymethyl cellulose, starch, KLP pellet binder is as organic binder bond.One
In individual exemplary embodiment, use syrup as organic binder bond.Because the most bentonitic inorganic bond
The use of agent can change the composition of reducing slag, so that the physicochemical properties deterioration of reducing slag, so
According to the method preparing clinker of the present invention uses organic binder bond, and do not use inorganic bond
Agent.
It is possible not only to provide final product according to the slaked lime used in the method preparing clinker of the present invention
A large amount of calcium constituents in thing clinker, and play the effect reducing slag system fusing point, thus be conducive to
The reduction of iron oxides and efficiently separating of slag ferrum.Additionally, slaked lime also acts as the binding agent of pelletizing.
The fineness of slaked lime is not particularly limited.
In the method preparing clinker according to the present invention, if using calcium oxide to replace slaked lime,
Then calcium oxide chance water can expand, and causes pelletizing undried and reduction that efflorescence just occurs.If used
Calcium chloride replaces slaked lime, although calcium chloride is conducive to melting separation, but can cause appearance in reducing slag
Glass phase, and then cause the reducing slag can not be from efflorescence.If using calcium sulfate to replace slaked lime, then can lead
The sulfur content caused in granulated iron exceeds standard, and pollutes environment.Therefore, according to the present invention to prepare cement ripe
The method of material uses slaked lime.
Based on high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime, high swage bauxite
The percentage by weight of breeze can be 54.55%～56.93%, and the percentage by weight of carbonaceous reducing agent can be
10.81%～11.28%, the percentage by weight of slaked lime can be 31.79%～34.64%.
If the percentage by weight of high swage bauxite breeze is less than 54.55%, then can cause the alkali of reducing slag
Degree raises, and affects reducing slag composition, reduces the dicalcium silicate (C in reducing slag2And C 12 A 7 S)
(C12A7) content, the final hydration and hardening intensity reducing clinker.If high swage bauxite breeze
Percentage by weight more than 56.93%, the basicity of reducing slag can be caused to reduce, affect reducing slag composition, drop
C in low reducing slag2S and C12A7Content, increases the content of cacoclasite simultaneously, and this composition is almost
Can not hydration and hardening, finally the hydration and hardening intensity of reduction clinker.
If the percentage by weight of carbonaceous reducing agent is less than 10.81%, then can cause the reduction of iron oxides not
Fully so that iron recovery is low；Also result in the iron content in reducing slag to raise, clinker is produced
Impact, such as, can reduce strength of cement.If the percentage by weight of carbonaceous reducing agent is more than 11.28%, then
Carbon content can be caused too much to make reduction energy consumption raise.
If the percentage by weight of slaked lime is less than 31.79%, the basicity of reducing slag can be caused to reduce, impact
Reducing slag composition, reduces the C in reducing slag2S and C12A7Content, increases containing of cacoclasite simultaneously
Amount, this composition is little to hydration and hardening, the final hydration and hardening intensity reducing clinker.If disappeared
The percentage by weight of Calx is more than 34.64%, then the basicity of reducing slag can be caused to raise, and affects reducing slag
Point, reduce the C in reducing slag2S and C12A7Content, the final hydration and hardening intensity reducing clinker.
The weight of organic binder bond is high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime
2%～4%.If the weight of organic binder bond is less than high swage bauxite breeze, carbonaceous reducing agent and disappears
The 2% of the gross weight of Calx, then can cause the lower compressive strength of the follow-up pelletizing being pressed into.If it is organic
The weight of binding agent is more than the 4% of the gross weight of high swage bauxite breeze, carbonaceous reducing agent and slaked lime,
Then can cause demoulding difficulty during follow-up pressed pellet, be simultaneously introduced too much organic binder bond
Clinker production cost and energy consumption can be increased.
The weight of water is high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime
7%～9%.If the weight of water is less than high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime
The 7% of amount, then can cause the lower compressive strength of the follow-up pelletizing being pressed into.If the weight of water is more than height
The 9% of the gross weight of swage bauxite breeze, carbonaceous reducing agent and slaked lime, then can cause being pressed into pelletizing
During the demoulding difficulty.
In a preferred exemplary embodiment, by high swage bauxite breeze, carbonaceous reducing agent, disappear
Calx, organic binder bond and water mix to obtain compound equably.In one exemplary embodiment,
First high swage bauxite breeze, carbonaceous reducing agent and slaked lime can be mixed, then by organic
Binding agent He Shui mixes with the compound of high swage bauxite breeze, carbonaceous reducing agent and slaked lime.
Can use any suitable equipment in this area that compound is made pelletizing.An exemplary reality
Execute in example, use ball press (such as roll type ball press) that compound is made pelletizing.Concrete at one
Exemplary embodiment in, use roll type ball press to be pressed into by compound with suitable pressure and there is conjunction
The pelletizing of suitable size.Pressure for suppressing compound is not particularly limited, for example,
10MPa～60MPa.The shape of the pelletizing made is not particularly limited, the most spherical, elliposoidal, flat
Shape, cuboid, the square bodily form, cylinder, wedge shape, olive shape, irregularly shaped etc..Make
The size of pelletizing is not particularly limited, and such as size (diameter, length, width, span etc.) is
The pelletizing of 10mm～100mm.
It is good from efflorescence effect to guarantee that the pelletizing using ball press to prepare has good mechanical strength.
But, if using the conventional disc balling machine of field of metallurgy or pelletising drum, then the pelletizing prepared
Mechanical strength may the lowest impact from efflorescence effect, and pelletizing size is less, burner hearth utilization rate during reduction
Low so that reduction energy consumption raises, and the granulated iron size produced is little.Therefore, preferred exemplary at one
In embodiment, use ball press that compound is made pelletizing.
Can use any suitable drying equipment in this area that pelletizing is dried.An example
Property embodiment in, use net belt type continuous oven drying case be dried pelletizing.It is not subject to for being dried the temperature of pelletizing
Concrete restriction, for example, 240 DEG C～260 DEG C.It is not particularly limited, such as being dried the time of pelletizing
It it is 2 hours～3 hours.
Any suitable equipment in this area can be used to perform the operation of molten point of direct-reduction.At one
In exemplary embodiment, to dried pelletizing at a temperature of 1400 DEG C～1450 DEG C under protective atmosphere
Carry out being reduced directly molten divisional processing.Protective atmosphere can be inert gas atmosphere or nitrogen atmosphere.If used
Temperature in molten point of direct-reduction is less than 1400 DEG C, then may not reduce fully in high swage bauxite
Ferrum oxide to form granulated iron and slag.If being higher than 1450 DEG C for being reduced directly the temperature of molten point, then may be used
The mobility that can cause pelletizing is excessive, can cause reducing slag and molten metal trickling, molten point of bonding direct-reduction
The bottom of equipment, thus granulated iron can not be formed.
In one exemplary embodiment, use multichannel high-temperature electric heat pushed bat kiln that dried pelletizing is entered
The molten divisional processing of row direct-reduction.In a specific exemplary embodiment, pick at multichannel high-temperature electric
In plate kiln, can be under the nitrogen atmosphere that flow is 4.0L/min～6.0L/min, at 1400 DEG C～1450 DEG C
At a temperature of dried pelletizing is reduced directly molten divisional processing 30min～40min.
During molten point of direct-reduction, at least some of iron oxides in high swage bauxite is by carbon
Matter reducing agent is reduced into metallic iron.Additionally, metallic iron carburizing is gradually melted, and agglomeration becomes big
Granulated iron, reducing slag the most thoroughly melts, but mobility is less but can guarantee that granulated iron trickles smoothly to also
Former slag congregate becomes large-sized granulated iron.It is thereby achieved that the dividing at least in part of granulated iron and reducing slag
From.If as it has been described above, be higher than 1450 DEG C for being reduced directly the temperature of molten point, then flowing may be caused
Property excessive, can cause reducing slag and molten metal trickling, the bottom of the molten subset of bonding direct-reduction, thus
Granulated iron can not be formed.
Pelletizing after molten point of direct-reduction is cooled so that pelletizing from efflorescence to obtain powder.Can be according to
Natural cooling and the mode accelerating to cool down cool down the pelletizing after molten point of direct-reduction.Can in atmosphere or protect
Protect and under atmosphere, perform this cooling.
In cooling procedure, due to the dicalcium silicate (C in reducing slag2S) Volumetric expansion, causes
Reducing slag from efflorescence, and then cause whole pelletizing from efflorescence, thus obtain powder.An example
In property embodiment, pelletizing can be close to 100% from pulverization rate, and the fineness of powder is more than 60 mesh
Ratio is the highest can reach 98.51%.It is therefore not necessary to powder is carried out for separating reducing slag and granulated iron
Break process, thus save energy consumption and simplify technological process.
Can use any suitable screening plant in this area that powder is sieved, with obtain granulated iron and
First from efflorescence reducing slag.In one exemplary embodiment, it is possible to use powder is sieved by vibrosieve
Point.In a specific exemplary embodiment, powder can be joined the vibrosieve that fineness is 80 mesh
On carry out screening separate, with this can realize the overwhelming majority (such as, 96.34%～98.51%) from efflorescence
Reducing slag efficiently separates with granulated iron.It is right that term used herein " first ", " second " etc. are used only for
Different material makes a distinction and is easy to describe, and is 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 clinker second from efflorescence reducing slag.In one exemplary embodiment,
Low intensity magnetic separation can be carried out from efflorescence reducing slag, such as under conditions of magnetic induction is 0.16T to first
Low intensity magnetic separation is carried out from efflorescence reducing slag to first.Second FeO content in efflorescence reducing slag and metallic iron
Content is few, and such as, the percetage by weight of FeO can be less than 2.0% (such as, 1.2%～2.0%
In the range of), metal Ferrum content can be less than 1.5% (such as, in the range of 0.1%～1.2%).
As clinker second mainly includes dicalcium silicate (C from the thing phase composition of efflorescence reducing slag2S)
With C 12 A 7 (C12A7).In one exemplary embodiment, as clinker second from
The thing phase composition of efflorescence reducing slag includes the C of by weight 26.32%～29.03%2S, 58.63%～66.67%
C12A7With 6.67%～15.05% cacoclasite (C2AS)。C2The heat of hydration of S is relatively low, aquation
Intensity is the strongest, but hydration rate is slower；C12A7Hydration rate the fastest, aquation intensity is relatively weak,
The heat of hydration is relatively mild.
As clinker second can include by weight from the chemical composition of efflorescence reducing slag
The Al of 29.82%～31.91%2O3, 13.39%～the SiO of 14.35%2With 53.74%～56.81% CaO.
Additionally, second can have a high specific surface area from efflorescence reducing slag as clinker, such as,
738m2/ kg～756m2/kg。
Therefore, second can be widely used as the additive of cement from efflorescence reducing slag, can reduce cement heat
Value, improves the setting rate of cement, improves early stage and the later strength of cement.An exemplary enforcement
In example, for as clinker second from efflorescence reducing slag, the aquation calorific value after maintenance 56 days is
26.8cal/g～35.7cal/g, the presetting period is 125min～165min, and final setting time is 200min～235min.
Can come by adjusting the as clinker second thing phase composition from efflorescence reducing slag and/or chemical composition
Realize cement calorific value, setting rate, initial set and final setting time and in early days and the control of later strength.
As clinker second can be adjusted from efflorescence by the composition of regulation pelletizing and/or process conditions
The thing phase composition of reducing slag and/or chemical composition.
Additionally, low alumina-silica ratio type difficulty can be processed according to the method preparing clinker of the present invention select high ferro
Bauxite, it is possible to achieve to metallic iron and the comprehensive utilization from efflorescence reducing slag.
It addition, according to the method preparing clinker of the present invention by controlling composition and/or the technique of pelletizing
Condition so that pelletizing can be close to 100% from pulverization rate, and the ratio that the fineness of powder is more than 60 mesh
Example is the highest can reach 98.51%, therefore without crushing powder for separating reducing slag and granulated iron
Process, thus save energy consumption and simplify technological process.
Additionally, according to the method preparing clinker of the present invention have simple to operate, energy consumption is low, produce
Efficiency advantages of higher.
Additionally, the highest iron recovery, example can be obtained according to the method preparing clinker of the present invention
Such as the iron recovery of more than 95%.
Below in conjunction with specific embodiment, the method preparing clinker according to the present invention is carried out in more detail
Describe.(a), (b) and (c) in Fig. 3 respectively illustrates preparation in embodiment 1 to embodiment 3
As clinker second from the photo of efflorescence reducing slag.
Embodiment 1
By Iron grade be 30.03%, aluminium oxide grade be 25.84%, A/S be 2.38 high swage alum clay
It is 60～120 mesh that ore deposit and anthracite are milled to granularity.Based on high swage bauxite breeze, anthracite and slaked lime
Gross weight 100%, high swage bauxite breeze by 56.93%, the anchracite duff of 11.28%, 31.79%
Slaked lime mix homogeneously.Based on high swage bauxite breeze, anthracite and the gross weight of slaked lime, will
The water of 7% and the industrial syrup of 4% join high swage bauxite breeze, anthracite and the mixing of slaked lime
In thing, mix homogeneously is to obtain compound.Feed the mixture into roll type ball press with belt and carry out pressure ball,
To prepare the elliposoidal pelletizing of a size of φ 40mm (major diameter) × 30mm (minor axis).With belt by ball
Group sends in net belt type continuous oven drying case dries, and drying temperature is 240 DEG C, and drying time is 2 little
Time.Pelletizing is sent in multichannel high-temperature electric heat pushed bat kiln after terminating by drying, is 4.0L/min being passed through flow
Nitrogen as carrying out molten point of high-temperature direct reduction under conditions of protective gas, the temperature that direct-reduction is molten point
Being 1400 DEG C, the time that direct-reduction is molten point is 30min.After molten point of end of direct-reduction, pelletizing is at air cooling
Under the conditions of be cooled to ambient temperature, during this air cooling, pelletizing occurs from powder phenomenon-tion, thus obtains powder
Material.Powder is sent into and sieves in the vibrosieve that fineness is 80 mesh, it is achieved that 96.34% from efflorescence
Efficiently separating of reducing slag and granulated iron, thus obtain granulated iron and first from efflorescence reducing slag.First from efflorescence
In reducing slag, the percetage by weight of FeO is 3.43%, and the percentage by weight of metallic iron is 2.14%.By
One carries out low intensity magnetic separation from efflorescence reducing slag under conditions of magnetic induction is 0.16T removes ferrum, thus obtains
Granulated iron and as clinker second from efflorescence reducing slag.
Second comprises the Al of 31.91% by weight from the chemical composition of efflorescence reducing slag2O3, 14.35%
SiO2, the CaO of 53.74%, the metallic iron of the FeO of 1.91% and 0.12%.Second from efflorescence reducing slag
Thing phase composition comprises the C of 26.32% by weight2S, the C of 58.63%12A7And the C of 15.05%2AS。
It addition, second is 738m from the specific surface area of efflorescence reducing slag2/kg。
Embodiment 2
By Iron grade be 30.82%, aluminium oxide grade be 24.32%, A/S be 1.98 high swage alum clay
It is 60～120 mesh that ore deposit and anthracite are milled to granularity.Based on high swage bauxite breeze, anthracite and slaked lime
Gross weight 100%, high swage bauxite breeze by 55.71%, the anchracite duff of 11.04%, 33.25%
Slaked lime mix homogeneously.Based on high swage bauxite breeze, anthracite and the gross weight of slaked lime, will
The water of 8% and the industrial syrup of 3% join high swage bauxite breeze, anthracite and the mixing of slaked lime
In thing, mix homogeneously is to obtain compound.Feed the mixture into roll type ball press with belt and carry out pressure ball,
To prepare the elliposoidal pelletizing of a size of φ 40mm (major diameter) × 30mm (minor axis).With belt by ball
Group sends in net belt type continuous oven drying case dries, and drying temperature is 250 DEG C, and drying time is 2.5 little
Time.Pelletizing is sent in multichannel high-temperature electric heat pushed bat kiln after terminating by drying, is 5.0L/min being passed through flow
Nitrogen as carrying out molten point of high-temperature direct reduction under conditions of protective gas, the temperature that direct-reduction is molten point
Being 1425 DEG C, the time that direct-reduction is molten point is 35min.After molten point of end of direct-reduction, pelletizing is at air cooling
Under the conditions of be cooled to ambient temperature, during this air cooling, pelletizing occurs from powder phenomenon-tion, thus obtains powder
Material.Powder is sent into and sieves in the vibrosieve that fineness is 80 mesh, it is achieved that 97.98% from efflorescence
Efficiently separating of reducing slag and granulated iron, thus obtain granulated iron and first from efflorescence reducing slag.By first from powder
Change reducing slag and under conditions of magnetic induction is 0.16T, carry out low intensity magnetic separation except ferrum, thus obtain granulated iron and
As clinker second from efflorescence reducing slag.
Second comprises the Al of 30.82% by weight from the chemical composition of efflorescence reducing slag2O3, 13.85%
SiO2, the CaO of 55.33%, the metallic iron of the FeO of 1.33% and 1.04%.Second from efflorescence reducing slag
Thing phase composition comprises the C of 28.89% by weight2S, the C of 64.44%12A7And the C of 6.67%2AS。
It addition, second is 751m from the specific surface area of efflorescence reducing slag2/kg。
Fig. 2 show in embodiment 2 preparation as clinker second from the XRD of efflorescence reducing slag
Analysis result.
Embodiment 3
By Iron grade be 28.21%, aluminium oxide grade be 26.46%, A/S be 2.25 high swage alum clay
It is 60～120 mesh that ore deposit and anthracite are milled to granularity.Based on high swage bauxite breeze, anthracite and slaked lime
Gross weight 100%, high swage bauxite breeze by 54.55%, the anchracite duff of 10.81%, 34.64%
Slaked lime mix homogeneously.Based on high swage bauxite breeze, anthracite and the gross weight of slaked lime, will
The water of 9% and the industrial syrup of 2% join high swage bauxite breeze, anthracite and the mixing of slaked lime
In thing, mix homogeneously is to obtain compound.Feed the mixture into roll type ball press with belt and carry out pressure ball,
To prepare the elliposoidal pelletizing of a size of φ 40mm (major diameter) × 30mm (minor axis).With belt by ball
Group sends in net belt type continuous oven drying case dries, and drying temperature is 260 DEG C, and drying time is 3 little
Time.Pelletizing is sent in multichannel high-temperature electric heat pushed bat kiln after terminating by drying, is 6.0L/min being passed through flow
Nitrogen as carrying out molten point of high-temperature direct reduction under conditions of protective gas, the temperature that direct-reduction is molten point
Being 1450 DEG C, the time that direct-reduction is molten point is 40min.After molten point of end of direct-reduction, pelletizing is at air cooling
Under the conditions of be cooled to ambient temperature, during this air cooling, pelletizing occurs from powder phenomenon-tion, thus obtains powder
Material.Powder is sent into and sieves in the vibrosieve that fineness is 80 mesh, it is achieved that 98.51% from efflorescence
Efficiently separating of reducing slag and granulated iron, thus obtain granulated iron and first from efflorescence reducing slag.By first from powder
Change reducing slag and under conditions of magnetic induction is 0.16T, carry out low intensity magnetic separation except ferrum, thus obtain granulated iron and
As clinker second from efflorescence reducing slag.
Second comprises the Al of 29.82% by weight from the chemical composition of efflorescence reducing slag2O3, 13.39%
SiO2, the CaO of 56.81%, the metallic iron of the FeO of 1.31% and 1.13%.Second from efflorescence reducing slag
Thing phase composition comprises the C of 29.03% by weight2S, the C of 63.44%12A7And the C of 7.53%2AS。
It addition, second is 756m from the specific surface area of efflorescence reducing slag2/kg。
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode.In the technology concept of the present invention, can be to the technical side of the present invention
Case carries out multiple simple variant and combination, and these simple variant belong to protection scope of the present invention.
Claims (8)
1. the method preparing clinker, it is characterised in that comprise the steps:
High swage bauxite breeze, carbonaceous reducing agent, slaked lime, organic binder bond and water are mixed, with
Obtain compound；
Compound is made pelletizing；
It is dried pelletizing；
Dried pelletizing is carried out molten point of direct-reduction；
Cooling pelletizing so that 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 clinker second from powder
Change reducing slag,
Wherein, high swage bauxite breeze has the Al being not less than 20%2O3Content, it is not less than 20%
All iron content and be not less than 48% Al2O3Content and Fe2O3Content sum,
Based on high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime, high swage bauxite
The percentage by weight of breeze is 54.55%～56.93%, and the percentage by weight of carbonaceous reducing agent is
10.81%～11.28%, the percentage by weight of slaked lime is 31.79%～34.64%,
The weight of organic binder bond is high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime
2%～4%,
The weight of water is high swage bauxite breeze, carbonaceous reducing agent and the gross weight of slaked lime
7%～9%,
Wherein, organic binder bond is syrup, polyvinyl alcohol, carboxymethyl cellulose, starch, KLP pelletizing
At least one in binding agent.
Method the most according to claim 1, it is characterised in that the Al of high swage bauxite breeze2O3
Content and SiO2The ratio of content is in the range of 1.5 to 4.0.
Method the most according to claim 1, it is characterised in that use ball press to be made by compound
Pelletizing.
Method the most according to claim 1, it is characterised in that use net belt type continuous oven drying case to exist
It is dried pelletizing 2 hours～3 hours at 240 DEG C～260 DEG C.
Method the most according to claim 1, it is characterised in that at 1400 DEG C under protective atmosphere
～at a temperature of 1450 DEG C, dried pelletizing is reduced directly molten divisional processing.
Method the most according to claim 5, it is characterised in that at multichannel high-temperature electric heat pushed bat kiln
In, under the nitrogen atmosphere that flow is 4.0L/min～6.0L/min, at a temperature of 1400 DEG C～1450 DEG C
Dried pelletizing is reduced directly molten divisional processing 30min～40min.
Method the most according to claim 1, it is characterised in that carry out from efflorescence reducing slag first
Low intensity magnetic separation.
Clinker prepared by method the most according to claim 1, it is characterised in that described cement
The thing phase composition of grog includes dicalcium silicate, 58.63%～66.67% of by weight 26.32%～29.03%
C 12 A 7 and the cacoclasite of 6.67%～15.05%, the chemical composition bag of described clinker
Include the Al of by weight 29.82%～31.91%2O3, 13.39%～the SiO of 14.35%2, 53.74%～56.81%
CaO, FeO less than 2.0% and metallic iron less than 1.5%.
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