CN103328383B - Process for producing ss-2caosio2 - Google Patents

Process for producing ss-2caosio2 Download PDF

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CN103328383B
CN103328383B CN201180065734.2A CN201180065734A CN103328383B CN 103328383 B CN103328383 B CN 103328383B CN 201180065734 A CN201180065734 A CN 201180065734A CN 103328383 B CN103328383 B CN 103328383B
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quality
raw material
brick
sio
mortar
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CN103328383A (en
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樋口隆行
富冈茂
渡边晃
山本贤司
盛冈实
庄司慎
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Denka Co Ltd
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Denki Kagaku Kogyo KK
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C01B33/24—Alkaline-earth metal silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/043—Alkaline-earth metal silicates, e.g. wollastonite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/023—Fired or melted materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

A process for producing ss-2CaOSiO2, comprising: selecting a raw material which comprises CaO and SiO2 as the main components and has a CaO/SiO2 molar ratio of 1.8 to 2.2 and which, after being heated at 1000 DEG C, exhibits a total content of Al2O3 and Fe2O3 of less than 5 mass%, and a total content of boron, phosphorus, barium, strontium and molybdenum of less than 0.5 mass% in terms of oxides; preparing, from the raw material, a mixture wherein the ratio of particles passing through a screen having 150-[mu]m openings is 90 mass% or higher; granulating the mixture; and firing the granulated mixture at a firing temperature of 1350 to 1600 DEG C in a rotary kiln in which brick or mortar is used on the inside surface of the firing zone. The brick or mortar is at least one selected from the group consisting of silica-alumina bricks comprising 45 to 80 mass% of Al2O3 and 20 to 55 mass% of SiO2, silica-alumina mortars comprising 25 to 80 mass% of Al2O3 and 20 to 75 mass% of SiO2, magnesia bricks comprising at least 85 mass% of MgO, and magnesia mortars comprising at least 85 mass% of MgO.

Description

β-2CaOSiO 2manufacture method
Technical field
The present invention relates generally to the β-2CaOSiO that can be used as cement admixture and use rightly 2manufacture method.
Background technology
At 2CaOSiO 2in the crystalline form of (Dicalcium Phosphate (Feed Grade)), known α type, β type, γ type etc.Wherein, stable is at normal temperatures β type and γ type.Known β type is a kind of composition of silicate cement (portland cement), although the hydraulicity is weak have the hydraulicity.On the other hand, although γ type does not have the hydraulicity, carbonating activity is high, and the availability as cement admixture is found in recent years (with reference to patent documentation 1).
At pure 2CaO-SiO 2in system, the 2CaOSiO of β type can not be generated 2, γ type can be formed.As to 2CaOSiO 2the principal element that has an impact of crystal habit, there will be a known: (1) ternary impact, the impact of (2) cooling conditions, (3) oxidation-reduction atmosphere etc.
As ternary impact, if known mixing exists a certain amount of above boron, phosphorus, barium, strontium, iron, aluminium, molybdenum etc., then β-2CaOSiO can be generated 2(with reference to non-patent literature 1, non-patent literature 2 and non-patent literature 3).
Prior art document
Non-patent literature
Patent documentation 1:WO03/016234 brochure
Non-patent literature
Non-patent literature 1:Schwiete et al., Zem.-Kalk-Gips, Vol.21, No.9,359,1968
Non-patent literature 2: bavin Tian Chunfu etc., Kiln industry Association meeting Chi, Vol.92, No.2,71,1984
Non-patent literature 3:Niesel et al.Tonind-Ztg., Vol.93, No.6,197,1969
Summary of the invention
the problem that invention will solve
The object of the present invention is to provide that whiteness is high, the β-2CaOSiO of the setting and harden of the cement that neither contains hazardous substance, also can not hinder 2manufacture method.
for the scheme of dealing with problems
The present inventor etc. have carried out various research repeatedly, found that: by selecting specific raw material, granulation is carried out to the raw material of specified particle size, is used in clinkering zone and employs specific brick, the rotary kiln of specific mortar burns till, can easily generate β-2CaOSiO 2.
That is, the present invention is a kind of β-2CaOSiO 2manufacture method, it is characterized in that, burn till the raw material through granulation with temperature of combustion 1350 DEG C ~ 1600 DEG C in rotary kiln, wherein, described rotary kiln employs at the inner face of clinkering zone and is selected from by Al 2o 3be 45 quality % ~ 80 quality %, SiO 2be silica-aluminas matter brick, the Al of 20 quality % ~ 55 quality % 2o 3be 25 quality % ~ 80 quality %, SiO 2be the silica-aluminas matter mortar of 20 quality % ~ 75 quality %, the MgO brick of more than at least a kind that to be the magnesia brick of more than 85 quality % and MgO be in the group of the magnesium oxide mortar composition of more than 85 quality % or mortar, the described raw material through granulation obtains in the following way: select with CaO and SiO 2as main component, CaO/SiO 2mol ratio be 1.8 ~ 2.2,1000 DEG C heating after Al 2o 3with Fe 2o 3total content be less than 5 quality %, and the total content of boron, phosphorus, barium, strontium and molybdenum converts by oxide compound and is less than the raw material of 0.5 quality %, counting more than 90 quality %, the i.e. screen underflow of 150 μm to the granularity of raw material by 150 μm of percent of pass is that the raw material of more than 90 quality % carries out granulation.
In the present invention, preferably, CaO and the SiO in raw material 2by CaO/SiO 2molar ratio computing be 1.9 ~ 2.1.
In addition, the raw material after 1000 DEG C of heating is preferably containing the Fe being less than 2 quality % 2o 3.
And then the granularity of raw material is preferably more than 90 quality % by 100 μm of percent of pass.
Raw material of the present invention preferably uses counts the water of 10 quality % ~ 30 quality % to carry out granulation by the ratio of water/raw material.
In addition, temperature of combustion when burning till is preferably 1400 DEG C ~ 1500 DEG C.
And then the thickness of the mortar on the brick surface of the clinkering zone of rotary kiln is preferably 5mm ~ 10mm.
β-the 2CaOSiO obtained by manufacture method of the present invention 2can be used as cement admixture to use aptly.
the effect of invention
According to β-2CaOSiO of the present invention 2manufacture method, continuously and easily can manufacture that whiteness is high, the β-2CaOSiO of the setting and harden of the cement that neither contains hazardous substance, also can not hinder 2.
Embodiment
It should be noted that, " part ", " % " in the present invention represents quality criteria when not having special stipulation.
β-2CaOSiO alleged in the present invention 2with CaO and SiO 2as the so-called Dicalcium Phosphate (Feed Grade) (2CaOSiO in the compound of main component 2) one.In the crystalline form of Dicalcium Phosphate (Feed Grade), there is α type, α ' type, β type, γ type.The present invention relates to the Dicalcium Phosphate (Feed Grade) of β type.
In the present invention, CaO raw material and SiO is used 2raw material is as main component.Main component refers to CaO and the SiO in preferred feedstock 2total content be preferably more than 80%, be more preferably more than 90%, the meaning that the content of the composition beyond them is as far as possible few.
As CaO raw material, calcium carbonate, calcium hydroxide, calcium oxide etc. can be used.
As SiO 2raw material, can select silica micro mist, clay, silicon ash, flying dust, amorphousness silica, other siliceous materials etc. generated by each industry pair.
Wherein, in the present invention, the existence limiting impurity is needed.Specifically, from CaO raw material, SiO 2the Al that raw material is mixed into 2o 3, Fe 2o 3total amount 1000 DEG C heating after raw material in need to be less than 5%.Al 2o 3, Fe 2o 3total amount be more preferably less than 4%, be most preferably less than 3%.
Especially, Fe 2o 3content preferably 1000 DEG C heating after raw material in be less than 2%, be more preferably less than 1.5%, be most preferably less than 1%.
In addition, as other compositions, the total content of boron, phosphorus, barium, strontium and molybdenum preferably converts by oxide compound and is less than 0.5%, is more preferably less than 0.3%.If not in aforementioned range, then from whiteness, the containing of objectionable impurities, it is not preferred sometimes that the viewpoint that the sclerosis of cement hinders is set out.
CaO raw material and SiO 2the compounding ratio of raw material needs the CaO/SiO be adjusted in raw material 2mol ratio is 1.8 ~ 2.2.The CaO/SiO of raw material 2when mol ratio is less than 1.8, the secondary wollastonite generating α type of meeting, the β-2CaOSiO in resultant 2containing ratio step-down.The CaO/SiO of raw material 2when mol ratio is more than 2.2, secondaryly can generate 3CaOSiO 2, free lime, the β-2CaOSiO in resultant 2containing ratio still can step-down.The CaO/SiO of raw material 2mol ratio is preferably 1.8 ~ 2.2, is more preferably 1.9 ~ 2.1.
CaO raw material and SiO 2the granularity of raw material needs preparation to 150 μm of percent of pass to be more than 90%, namely the screen underflow of 150 μm be more than 90%, more preferably prepare 100 μm of percent of pass be more than 90%, namely the screen underflow of 100 μm be more than 90%.If the granularity of raw material is not small to aforementioned range, then β-2CaOSiO 2purity be deteriorated.Specifically, there is free lime, do not dissolve the many tendencies of remaining component change.
In the present invention, preferably to for promoting β-2CaOSiO 2generation and the raw material allocated carries out granulation.Granulation refers to the material forming of allotment to be the operation of ball shape.Granulation preferably becomes 1mm ~ 50mm by granularity, the mode that more preferably becomes 10mm ~ 30mm by granularity is carried out.
As the method for granulation, can list to drop in the rotary drum of collar plate shape raw material and water to carry out granulation method, put into the method etc. that what is called that raw material carries out extrusion forming uses tablets press in a mold.
The usage quantity of the water used when granulation is preferably (0.1 ~ 0.3)/1 by the mass ratio of water/raw material, is more preferably (0.15 ~ 0.25)/1.When the usage quantity of water is less than 10%, the raw material easy disintegrating of granulation, burns till the situation that reaction is not fully carried out when there is burning till in rotary kiln.In addition, when the usage quantity of water is more than 30%, it is large that the raw material of granulation becomes moisture, still easily avalanche, there is the situation of to burn till reaction when burning till in rotary kiln and fully not carrying out.Due in raw material containing more water, therefore in order to make it evaporate, need a large amount of to burn till energy, thus uneconomical, in addition, carrying capacity of environment also becomes large, thus not preferred.
In the present invention, with rotary kiln, the raw material after granulation is burnt till.For its temperature, need to burn till with temperature of combustion 1350 DEG C ~ 1600 DEG C, be preferably 1375 DEG C ~ 1550 DEG C, be more preferably 1400 DEG C ~ 1500 DEG C.When temperature of combustion is less than 1350 DEG C, β-2CaOSiO 2purity be deteriorated.Specifically, there is free lime, do not dissolve the many tendencies of remaining component change.Otherwise when temperature of combustion is more than 1600 DEG C, meeting melting also adheres to skinning (coating) in kiln, and operation sometimes becomes difficult, β-2CaOSiO sometimes 2mix and become significantly.In addition, it is greatly also uneconomic for burning till energy.It should be noted that, in the present invention, said temperature of combustion refers to the top temperature in kiln.Usually, the top temperature in kiln is positioned at the front adjacent of the flame (shape that fire is scorching) extended from combustion chamber.
The brick used in the clinkering zone of rotary kiln, the material of mortar are important.More than at least one of brick in the group being selected from and being made up of following (1) ~ (4) or mortar can be used in the present invention.
(1) in the high alumina refractory brick of JIS R2305 defined, Al 2o 3containing ratio be 45 ~ 80%, be preferably 55 ~ 70%, SiO 2containing ratio be 20 ~ 55%, be preferably the silica-aluminas matter brick of 30 ~ 45%.
(2) in the magnesia brick of JIS R2302 defined, the containing ratio of MgO is more than 85%, is preferably the magnesia brick of more than 90%.
When employing brick other than the above, β-2CaOSiO sometimes 2production rate step-down or brick melting and produce skinning with raw material reaction.The shape of brick, thickness are not particularly limited, it is desirable to the brick selecting appropriate size according to rotary kiln diameter.
(3) containing ratio of MgO is more than 85%, is preferably the magnesia refractory mortar of more than 90%.
(4) in the clayey fire mortar and high alumina matter fire mortar of JIS R2501 defined, Al 2o 3containing ratio be 25 ~ 80%, be preferably 35 ~ 70%, SiO 2containing ratio be 20 ~ 75%, be preferably the silica-aluminas matter mortar of 30 ~ 65%.
In the present invention, when using above-mentioned mortar in clinkering zone, these mortar preferably carry out being coated with using on the surface of the brick of the clinkering zone of rotary kiln.
Be not particularly limited the working conditions of the mortar of coating, usually, the thickness of mortar is 5mm ~ 10mm, is preferably 6mm ~ 9mm.The amount of the water used in coating is different according to the kind of mortar, is preferably 15% ~ 35% relative to mortar composition.Wherein, the amount of the water used in coating is preferably 30% ~ 35% in silica-aluminas matter mortar, in magnesium oxide mortar, be preferably 15 ~ 20%.β-the 2CaOSiO sometimes when aforementioned range is outer 2containing ratio step-down, or brick melting and produce skinning with raw material reaction.In addition, in cement rotary kiln purposes, brick, mortar be Chrome-free all preferably.
In the present invention, after burning till, carry out cooling operation, but cooling conditions is not particularly limited, do not carry out special quench operation.Specifically, can be the method for the cooling conditions based on common silicate cement agglomerate, after burning till in rotary kiln, be cooled by air-cooling system etc. under under atmospheric environment.
Heat treating method is not particularly limited, rotary kiln, electric furnace, tunnel furnace, shaft kiln, fluidized bed type incinerator etc. can be used.
Embodiment
Then, by embodiment and comparative example, more specific description is carried out to the present invention, but the present invention should not be construed as and limits by following embodiment.
" experimental example 1 "
Use vibration tank material grinder (central chemical industry machine Co., Ltd. manufactures), compounding following CaO raw material, SiO 2raw material, Al 2o 3composition and Fe 2o 3composition, prepares CaO/SiO as shown in table 1 2mol ratio be 2.0 and 1000 DEG C heating after Al 2o 3content and Fe 2o 3the raw material of the various formulas that content is different.By these raw material tablets presss (device: small-sized dish-type granulators; Sansho Industry Co.; Ltd. manufacture) under the mass ratio of water/raw material is the condition of 0.2/1 granulation make granularity be 10 ~ 30mm, by as shown in table 1, the rotary kiln that the material of clinkering zone inner face changes is burnt till at 1450 DEG C.Evaluate the sample of gained resultant, result is remembered in the lump in table 1.
< rotary kiln >
The rotary kiln used in experimental example of the present invention is the cylindrical shape of internal diameter 1m, length 20m, and the refractory body of the inner face of the clinkering zone of rotary kiln is brick (thickness 120mm) or the surface coated refractory body of mortar (thickness 7mm) at brick.
Material (the material > of the refractory body of the inner face of clinkering zone of < clinkering zone
The material (1) of clinkering zone: Al 2o 3containing ratio 60%, SiO 2the silica-aluminas matter brick (commercially available product) of containing ratio 40%.
The material (2) of clinkering zone: the magnesia brick (commercially available product) of MgO containing ratio 91%.
The material (3) of clinkering zone: at the inner face of the brick of above-mentioned (1), magnesia refractory mortar (YOTAI REFRACTORIES CO. is coated with thickness 7mm under the mass ratio of water/mortar is the condition of 0.17, LTD manufactures, trade(brand)name YOTAI HEAT SET M, maximum particle diameter 0.6mm) and the material of acquisition.
The material (4) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the mass ratio of water/mortar is the condition of 0.33 2o 3containing ratio 60%, SiO 2the silica-aluminas matter fire mortar of containing ratio 40% and the material obtained.
< uses material >
CaO raw material: limestone micropowder.CaO is 55.4%, MgO is 0.37%, Al 2o 3be 0.05%, Fe 2o 3be 0.02%, and SiO 2be 0.10%, calcination loss (1000 DEG C) is 43.57%, does not detect carbon component.150 μm of percent of pass: 97.0%, 100 μm of percent of pass: 91.9%.
SiO 2raw material: silica micro mist.CaO is 0.02%, MgO is 0.04%, Al 2o 3be 2.71%, Fe 2o 3be 0.27%, SiO 2be 95.83%, and TiO 2be 0.23%, do not detect carbon component.Calcination loss (1000 DEG C) is 0.51%, 150 μm of percent of pass: 95.1%, 100 μm of percent of pass: 90.3%.
Al 2o 3composition: industrial alumina, purity more than 99%.
Fe 2o 3composition: industrial ferric oxide, purity more than 99%.
Water: tap water.
< measuring method >
Various evaluating characteristics has been carried out in the following manner for the resultant obtained after burning till.
The qualification of compound: by powder X-ray diffractometry (device: powder x-ray diffraction device (Multiplex), Rigaku Corporation manufactures) authenticating compound.
Chemical composition quantitative: by Al 2o 3composition, Fe 2o 3composition carries out analyzing according to JIS R5202 and quantitatively.
The observation of color: by the visual degree judging white.Observe in the room of the illumination of 200 luxs, be prepared into 3000 ± 100cm to by Blain specific surface 2the white content of the powder of/g is observed.The situation of white is set to zero, the situation of yellow is set to △, the situation of brown is set to ×.
Time of coagulation and compressive strength: relative to 90 parts of ordinary Portland cements, add 10 parts of β-2CaOSiO respectively 2, γ-2CaOSiO 2make cement composition.Use this cement composition, prepare mortar according to JIS R5201, measure finishing the time of condensation.In addition, the material age compressive strength of 1 day is also measured wered.
table 1
S:Strong, detects with strong diffraction peak.W:Weak, detects with weak diffraction peak.
β-C 2S:β-2CaO·SiO 2
" experimental example 2 "
By the CaO/SiO of raw material 2mol ratio is fixed as 2.0, by Fe 2o 3content is fixed as 0.3% and by Al 2o 3content is fixed as 1.4%, changes the brick of clinkering zone, the chemical constitution of mortar, in addition, to carry out equally with experimental example 1.Result is shown in table 2.
The material > of < clinkering zone
The material (5) of clinkering zone: Al 2o 3containing ratio 45%, SiO 2the silica-aluminas matter brick (commercially available product) of containing ratio 55%.
The material (6) of clinkering zone: Al 2o 3containing ratio 80%, SiO 2the silica-aluminas matter brick (commercially available product) of containing ratio 20%.
The material (7) of clinkering zone: the magnesia brick (commercially available product) of MgO containing ratio 85%.
The material (8) of clinkering zone: the magnesia brick (commercially available product) of MgO containing ratio 95%.
The material (9) of clinkering zone: Al 2o 3containing ratio 95%, SiO 2high purity alumina matter brick (commercially available product) of containing ratio 5%.
The material (10) of clinkering zone: spinel brick (commercially available product).
The material (11) of clinkering zone: at the inner face of the brick of above-mentioned (1), magnesium oxide-spinelle refractory mortar (YOTAI REFRACTORIES CO. is coated with thickness 7mm under the mass ratio of water/mortar is the condition of 0.17, LTD manufactures, trade(brand)name YOTAI HEAT SET M, maximum particle diameter 0.6mm) and the material of acquisition.
The material (12) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the mass ratio of water/mortar is the condition of 0.17 2o 3the high alumina matter mortar of more than 90% (YOTAI REFRACTORIES CO., LTD manufacture, trade(brand)name YOTAI HEAT SET M, maximum particle diameter 0.5mm) and the material that obtains.
The fire mortar (13) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the mass ratio of water/mortar is the condition of 0.33 2o 3containing ratio 25%, SiO 2the silica-aluminas matter mortar of containing ratio 75% and the material obtained.
The fire mortar (14) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the quality ratio of water/mortar is the condition of 0.33 2o 3containing ratio 45%, SiO 2the silica-aluminas matter mortar of containing ratio 55% and the material obtained.
The fire mortar (15) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the quality ratio of water/mortar is the condition of 0.33 2o 3containing ratio 80%, SiO 2the silica-aluminas matter mortar of containing ratio 20% and the material obtained.
The fire mortar (16) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the quality ratio of water/mortar is the condition of 0.33 2o 3containing ratio 90%, SiO 2the high purity alumina matter fire mortar of containing ratio 10% and the material obtained.
The fire mortar (17) of clinkering zone: at the inner face of the brick of above-mentioned (1), is coated with Al with thickness 7mm under the quality ratio of water/mortar is the condition of 0.33 2o 3containing ratio 96%, SiO 2the high purity alumina matter fire mortar of containing ratio 4% and the material obtained.
In the expression of material in table 2, such as " Al45 " refers to Al 2o 3containing ratio be the material of the clinkering zone of 45%, " Mg85 " refers to that the containing ratio of MgO is the material of the clinkering zone of 85%.For other, it is also same example methodology.
table 2
S:Strong, to detect with strong diffraction peak.W:Weak, to detect with weak diffraction peak.
β-C 2S：β-2CaO·SiO 2，γ-C 2S:γ-2CaO·SiO 2
" experimental example 3 "
Carry out compared with the prior art.As shown in table 3, will all the time as making β-2CaOSiO 2the element of stabilization and known Fe 2o 3, Al 2o 3, BO 3, BaO, P 2o 5, SrO or MoO 3compounding by the ratio shown in table 3, in addition, to carry out equally with experimental example 1.Result is shown in table 3.
table 3
S:Strong, detects with strong diffraction peak.W:Weak, detects with weak diffraction peak.
β-C 2S:β-2CaO·SiO 2.δ-C 2S:δ-2CaO·SiO 2
" experimental example 4 "
By CaO raw material and SiO 2the CaO/SiO of raw material 2mol ratio changes to as shown in table 4, in addition, to carry out equally with experimental example 1.Result is shown in table 4.
table 4
S:Strong, detects with strong diffraction peak.W:Weak, detects with weak diffraction peak.
β-C 2S:β-2CaO·SiO 2.α-CS:α-CaO.SiO 2·C 3S:3CaO·SiO 2
" experimental example 5 "
Thermal treatment temp is changed to as shown in table 5, in addition, to carry out equally with experimental example 1.Result is shown in table 5.
table 5
S:Strong, to detect with strong diffraction peak.W:Weak, to detect with weak diffraction peak.
β-C 2S:β-2CaO·SiO 2.α-CS:α-Cao·SiO 2
" experimental example 6 "
The ratio of water during granulation is changed to as shown in table 6, in addition, to carry out equally with experimental example 1.Result is shown in table 6.
table 6
S:Strong, detects with strong diffraction peak.W:Weak, detects with weak diffraction peak.
β-C 2S:β-2CaO·SiO 2.α-CS:α-CaO·SiO 2
utilizability in industry
β-2CaOSiO of the present invention 2manufacture method can manufacture that whiteness is high, the β-2CaOSiO of the setting and harden that also can not hinder cement 2, can utilize on a large scale in cement field etc.
It should be noted that, quote so far by the full content of No. 2011-021614, the Japanese patent application applied on February 3rd, 2011, No. 2011-021658, Japanese patent application, No. 2011-128708, the Japanese patent application in application on June 8th, 2011 and the specification sheets of No. 2011-172188, Japanese patent application in application on August 5th, 2011 in application on February 3rd, 2011, claims and summary, the disclosure as specification sheets of the present invention is included in.

Claims (11)

1. a β-2CaOSiO 2manufacture method, it is characterized in that,
Described method is burnt till the raw material through granulation with temperature of combustion 1350 DEG C ~ 1600 DEG C in rotary kiln, wherein,
Described rotary kiln employs at the inner face of clinkering zone and is selected from by Al 2o 3be 45 quality % ~ 80 quality %, SiO 2be silica-aluminas matter brick, the Al of 20 quality % ~ 55 quality % 2o 3be 25 quality % ~ 80 quality %, SiO 2be the silica-aluminas matter mortar of 20 quality % ~ 75 quality %, MgO to be the magnesia brick of more than 85 quality % and MgO be in the group of the magnesium oxide mortar composition of more than 85 quality % more than at least a kind,
The described raw material through granulation obtains in the following way:
Select with CaO and SiO 2as main component, CaO/SiO 2mol ratio be 1.8 ~ 2.2,1000 DEG C heating after Al 2o 3with Fe 2o 3total content be less than 5 quality %, and the total content of boron, phosphorus, barium, strontium and molybdenum converts by oxide compound and is less than the raw material of 0.5 quality %,
Granulation is carried out to the raw material that the granularity of raw material counts more than 90 quality % by 150 μm of percent of pass.
2. manufacture method according to claim 1, wherein, described rotary kiln uses Al in the brick of clinkering zone 2o 3be 45 quality % ~ 80 quality %, SiO 2it is the silica-aluminas matter brick of 20 ~ 55 quality %.
3. manufacture method according to claim 1, wherein, described rotary kiln is the magnesium oxide mortar of more than 85 quality % at the surface coated MgO of the brick of clinkering zone.
4. manufacture method according to claim 1, wherein, described rotary kiln uses MgO to be the magnesia brick of more than 85 quality % in the brick of clinkering zone.
5. manufacture method according to claim 1, wherein, described rotary kiln is at the surface coated Al of the brick of clinkering zone 2o 3be 25 quality % ~ 80 quality %, SiO 2it is the silica-aluminas matter mortar of 20 quality % ~ 75 quality %.
6. the manufacture method according to any one in Claims 1 to 5, wherein, the CaO/SiO of raw material 2mol ratio be 1.9 ~ 2.1.
7. the manufacture method according to any one in Claims 1 to 5, wherein, the raw material after 1000 DEG C of heating contains the Fe being less than 2 quality % 2o 3.
8. the manufacture method according to any one in Claims 1 to 5, wherein, raw material has the granularity counting more than 90 quality % by 100 μm of percent of pass.
9. the manufacture method according to any one in Claims 1 to 5, wherein, uses the mass ratio of water/raw material to be that the water of (0.1 ~ 0.3)/1 carries out granulation.
10. the manufacture method according to any one in Claims 1 to 5, wherein, burns till with the temperature of combustion of 1400 DEG C ~ 1500 DEG C.
11. manufacture method according to any one in claim 1,3,5, wherein, the thickness of the mortar on the brick surface of the clinkering zone of rotary kiln is 5mm ~ 10mm.
CN201180065734.2A 2011-02-03 2011-11-11 Process for producing ss-2caosio2 Active CN103328383B (en)

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