CN109485389A - A kind of micropore calcium magnesite and preparation method thereof - Google Patents
A kind of micropore calcium magnesite and preparation method thereof Download PDFInfo
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- CN109485389A CN109485389A CN201811402907.5A CN201811402907A CN109485389A CN 109485389 A CN109485389 A CN 109485389A CN 201811402907 A CN201811402907 A CN 201811402907A CN 109485389 A CN109485389 A CN 109485389A
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- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
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- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62675—Thermal treatment of powders or mixtures thereof other than sintering characterised by the treatment temperature
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- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
- C04B2235/321—Dolomites, i.e. mixed calcium magnesium carbonates
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- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/442—Carbonates
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Abstract
A kind of micropore calcium magnesite is formulated by following raw material: the light-burning magnesium powder of 50wt%~70wt%, the light dolomite powder of 25wt%~40wt%, 5wt%~10wt% additive；The additive is carbonate micro mist, and the D50 value of the additive is 50~500nm.The beneficial effects of the present invention are: 1) use carbonate micro mist decomposition in situ method, the carbonate micro mist of addition decomposes at high temperature generates carbon dioxide, leave a large amount of stomatas, the micro mist of addition is nanoscale micro mist, decomposing and generating stomata is mostly sealed porosity, and air vent aperture is small, the carbonate micro mist ingredient of addition is consistent with principal component, will not bring impurity component into.2) micropore calcium magnesite of the invention is through detecting: bulk density is 2.80~3.05g/cm3, porosity > 3.0%, closed porosity accounts for total porosity ratio > 60%, and 0.05~0.3 μm of average pore size.3) calcium magnesite of the invention has the characteristics that bulk density is low, average pore size is small, closed porosity is high, thermal conductivity is low, good thermal shock stability, resistance to erosion and slag-resistant erosiveness are strong.
Description
Technical field
The present invention relates to technical field of refractory materials more particularly to a kind of micropore calcium magnesite and preparation method thereof.
Background technique
Magnesia-calica refractory is especially unique net due to good high-temperature stability, alkali resistance scouring
Change molten steel performance, becomes indispensable important refractory material in modern steel industry especially external refining.Magnesium calcium system
Refractory material principal crystalline phase is based on periclase and square calcium stone two-phase, and at 1000 DEG C, the thermal conductivity of periclase crystal is 6.7W
m-1·K-1, the crystal thermal conductivity of square calcium stone is 15Wm-1·K-1, cause the thermal conductivity of magnesia-calica refractory higher, common magnesium
Thermal conductivity is in 4.0Wm at 1000 DEG C of calcium brick-1·K-1Left and right, the magnesia-calica refractory of high thermal conductivity are led in use
Want that there are probelem in two aspects: first, it will cause a large amount of heat loss of Industrial Stoves；Second, in fire proofed wood in use process
The thermal stress that temperature gradient existing for material inside generates easily leads to the thermal spalling of material.Therefore, the low working lining of research thermal conductivity
It is the energy-saving new way of Industrial Stoves with refractory material, and improves the effective way of material thermal spalling.Influence fire resisting
The factor of material thermal conductivity mainly has the density of material and the structure of material, the refractory material of material of the same race, under normal circumstances
Density is bigger, and intramolecule is closer, then thermal coefficient is also bigger；Material structure is loose porous, and has more tiny hole,
And hole is full of by gas, since the thermal conductivity ratio solid of gas is small, so the thermal coefficient of material is low.
Primary raw material of the calcium magnesite as production magnesia-calica refractory, performance directly affect the use of product, drop
The bulk density of low calcium magnesite increases the microporosity of calcium magnesite, can effectively reduce its thermal conductivity, to reduce magnesium calcium system fire proofed wood
The thermal conductivity of material improves the service performance of magnesia-calica refractory.
Summary of the invention
The present invention is directed to overcome prior art defect, it is therefore an objective to provide that a kind of bulk density is low, average pore size is small, silent gas
The micropore calcium magnesite and its preparation side that porosity is high, thermal conductivity is low, good thermal shock stability, resistance to erosion and slag-resistant erosiveness are strong
Method.
To achieve the above object, the present invention is implemented with the following technical solutions:
A kind of micropore calcium magnesite is formulated by following raw material: the light-burning magnesium powder of 50wt%~70wt%, 25wt%~
The additive of the light dolomite powder of 40wt%, 5wt%~10wt%；The additive is carbonate micro mist, the additive
D50 value be 50~500nm.
The carbonate micro mist is one or more of ultra-fine magnesite mountain flour, superfine dolomite dust, super-fine limestone powder.
The light-burning magnesium powder principal crystalline phase be periclase, content of MgO > 95wt%, impurity content < 2wt%, IL < 3wt%,
Light-burning magnesium powder partial size≤0.088mm.
The light dolomite powder principal crystalline phase is periclase and square calcium stone, content of MgO > 42wt%, CaO content >
55wt%, impurity content < 1wt%, IL < 2wt%, light dolomite powder diameter≤0.088mm.
A kind of preparation method of micropore calcium magnesite, includes the following steps:
1) water is added sufficiently to be digested in digester in light dolomite powder, amount of water is light dolomite powder
20wt%~40wt%, digestion time 30~60 hours；
2) mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill, be milled altogether
0.044 μm of granularity <；
3) carbonate micro mist secondary total mill in the ball mill is added in the mixed powder of milled altogether, the time was at 20~40 minutes；
4) it will be milled altogether obtained in step 3) and be kneaded in planetary-type mixer, be kneaded the time at 20~50 minutes；
5) material being kneaded is sent into ball press balling-up；Green body is spontaneously dried 24~72 hours；Finally green body is put into
It is calcined in high temperature vertical kiln, temperature is 1750 DEG C~2100 DEG C, keeps the temperature 5~12 hours, is broken into particle after cooling and obtains micropore magnesium
Calcium sand.
Compared with prior art, the beneficial effects of the present invention are:
1) present invention uses carbonate micro mist decomposition in situ method, and the carbonate micro mist of addition decomposes at high temperature generates dioxy
Change carbon, leave a large amount of stomatas, the micro mist of addition is nanoscale micro mist, and decomposing and generating stomata is mostly sealed porosity, and air vent aperture
Small, the carbonate micro mist ingredient of addition is consistent with principal component, will not bring impurity component into.
2) the low heat-conductive porous calcium magnesite prepared by the present invention is through detecting: bulk density is 2.80~3.05g/cm3, stomata
Rate > 3.0%, closed porosity account for total porosity ratio > 60%, and 0.05~0.3 μm of average pore size.
3) the low heat-conductive porous calcium magnesite prepared by the present invention is with bulk density is low, average pore size is small, closed porosity
Feature high, thermal conductivity is low, good thermal shock stability, resistance to erosion and slag-resistant erosiveness are strong.
Specific embodiment
It elaborates below to the present invention, but practical range of the invention is not limited only to embodiment disclosed below.
A kind of micropore calcium magnesite is formulated by following raw material: the light-burning magnesium powder of 50wt%~70wt%, 25wt%~
The additive of the light dolomite powder of 40wt%, 5wt%~10wt%；The additive is carbonate micro mist, the additive
D50 value be 50~500nm.
The carbonate micro mist is one or more of ultra-fine magnesite mountain flour, superfine dolomite dust, super-fine limestone powder.
The light-burning magnesium powder principal crystalline phase be periclase, content of MgO > 95wt%, impurity content < 2wt%, IL < 3wt%,
Light-burning magnesium powder partial size≤0.088mm.
The light dolomite powder principal crystalline phase is periclase and square calcium stone, content of MgO > 42wt%, CaO content >
55wt%, impurity content < 1wt%, IL < 2wt%, light dolomite powder diameter≤0.088mm.
A kind of preparation method of micropore calcium magnesite, includes the following steps:
1) water is added sufficiently to be digested in digester in light dolomite powder, amount of water is light dolomite powder
20wt%~40wt%, digestion time 30~60 hours；
2) mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill, be milled altogether
0.044 μm of granularity <；
3) carbonate micro mist secondary total mill in the ball mill is added in the mixed powder of milled altogether, the time was at 20~40 minutes；
4) it will be milled altogether obtained in step 3) and be kneaded in planetary-type mixer, be kneaded the time at 20~50 minutes；
5) material being kneaded is sent into ball press balling-up；Green body is spontaneously dried 24~72 hours；Finally green body is put into
It is calcined in high temperature vertical kiln, temperature is 1750 DEG C~2100 DEG C, keeps the temperature 5~12 hours, is broken into particle after cooling and obtains micropore magnesium
Calcium sand.
Embodiment 1:
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 50wt%~55wt%, 38wt%~
The light dolomite powder of 40wt% and the ultra-fine magnesite micro mist of 7wt%~10wt% are raw material.Light dolomite powder is being disappeared
Change in pond plus water is sufficiently digested, amount of water accounts for 20wt%~30wt% of light dolomite powder, and digestion time 30~45 is small
When；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill, the granularity < being milled altogether
0.044μm；Ultra-fine magnesite micro mist secondary total mill in the ball mill is added in the mixed powder of milled altogether, the time is at 20~30 points
Clock；It will be milled and be kneaded in planetary-type mixer altogether, and be kneaded the time at 35~50 minutes；The material that has been kneaded be sent into ball press at
Ball；Green body is spontaneously dried 48~72 hours；Finally green body is put into high temperature vertical kiln and is calcined, temperature is 1750~1900 DEG C,
Heat preservation 8~12 hours is broken into particle after cooling and obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.85~3.00g/cm3, porosity >
3.2%, closed porosity accounts for total porosity ratio > 62%, and 0.15~0.3 μm of average pore size.
Embodiment 2:
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 50wt%~55wt%, 38wt%~
The light dolomite powder of 40wt% and the super fine bitter spar micro mist of 7wt%~10wt% are raw material.Light dolomite powder is being disappeared
Change in pond plus water is sufficiently digested, amount of water accounts for 30wt%~40wt% of light dolomite powder, and digestion time 45~60 is small
When；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill, the granularity < being milled altogether
0.044μm；Super fine bitter spar micro mist secondary total mill in the ball mill is added in the mixed powder of milled altogether, the time is at 30~40 points
Clock；It will be milled and be kneaded in planetary-type mixer altogether, and be kneaded the time at 20~35 minutes；The material that has been kneaded be sent into ball press at
Ball；Green body is spontaneously dried 24~48 hours；Finally green body is put into high temperature vertical kiln and is calcined, temperature is 1900~2100 DEG C,
Heat preservation 5~9 hours is broken into particle after cooling and obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present invention: bulk density is 2.80~2.95g/cm3, porosity >
3.3%, closed porosity accounts for total porosity ratio > 62%, and 0.2~0.3 μm of average pore size.
Embodiment 3
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 55wt%~60wt%, 35wt%~
The light dolomite powder of 38wt% and the ultra-fine limestone micro mist of 5wt%~7wt% are raw material.Light dolomite powder is being digested
In pond plus water is sufficiently digested, and amount of water accounts for 20wt%~30wt% of light dolomite powder, and digestion time 30~45 hours；
The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill, the granularity < being milled altogether
0.044μm；Ultra-fine limestone micro mist secondary total mill in the ball mill is added in the mixed powder of milled altogether, the time is at 20~30 points
Clock；It will be milled and be kneaded in planetary-type mixer altogether, and be kneaded the time at 35~50 minutes；The material that has been kneaded be sent into ball press at
Ball；Green body is spontaneously dried 48~72 hours；Finally green body is put into high temperature vertical kiln and is calcined, temperature is 1750~1900 DEG C,
Heat preservation 8~12 hours is broken into particle after cooling and obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.85~3.00g/cm3, porosity >
3.2%, closed porosity accounts for total porosity ratio > 63%, and 0.15~0.25 μm of average pore size.
Embodiment 4:
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 55wt%~60wt%, 35wt%~
The mixed powder of the light dolomite powder of 38wt% and the ultra-fine magnesite of 5wt%~7wt% and super fine bitter spar is raw material.It will be light
Calcined dolomite powder is in digester plus water is sufficiently digested, and amount of water accounts for 30wt%~40wt% of light dolomite powder, disappears
Change the time 45~60 hours；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill,
0.044 μm of the granularity < being milled altogether；The mixed powder of ultra-fine magnesite and super fine bitter spar is added in ball in the mixed powder of milled altogether
Secondary total mill in grinding machine, the time was at 30~40 minutes；It will be milled and be kneaded in planetary-type mixer altogether, and be kneaded the time 20~35
Minute；The material being kneaded is sent into ball press balling-up；Green body is spontaneously dried 24~48 hours；Green body is finally put into high temperature to erect
It is calcined in kiln, temperature is 1900~2100 DEG C, keeps the temperature 5~9 hours, is broken into particle after cooling and obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.80~2.90g/cm3, porosity >
3.5%, closed porosity accounts for total porosity ratio > 64%, and 0.2~0.3 μm of average pore size.
Embodiment 5:
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 60wt%~65wt%, 28wt%~
The mixed powder of the light dolomite powder of 30wt% and the ultra-fine magnesite of 7wt%~10wt% and ultra-fine limestone is raw material.It will
Light dolomite powder is in digester plus water is sufficiently digested, and amount of water accounts for 20wt%~30wt% of light dolomite powder,
Digestion time 30~45 hours；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is total to
Mill, 0.044 μm of the granularity < being milled altogether；Ultra-fine magnesite is added in the mixed powder of milled altogether and the mixed powder of ultra-fine limestone exists
Secondary total mill in ball mill, the time was at 20~30 minutes；To be milled and be kneaded in planetary-type mixer altogether, be kneaded the time 35~
50 minutes；The material being kneaded is sent into ball press balling-up；Green body is spontaneously dried 48~72 hours；Green body is finally put into high temperature
It is calcined in shaft furnace, temperature is 1750~1900 DEG C, keeps the temperature 8~12 hours, is broken into particle after cooling and obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.85~2.95g/cm3, porosity >
3.5%, closed porosity accounts for total porosity ratio > 65%, and 0.1~0.2 μm of average pore size.
Embodiment 6:
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 60wt%~65wt%, 28wt%~
The mixed powder of the light dolomite powder of 30wt% and the super fine bitter spar of 7wt%~10wt% and ultra-fine limestone is raw material.It will
Light dolomite powder is in digester plus water is sufficiently digested, and amount of water accounts for 30wt%~40wt% of light dolomite powder,
Digestion time 45~60 hours；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is total to
Mill, 0.044 μm of the granularity < being milled altogether；Super fine bitter spar is added in the mixed powder of milled altogether and the mixed powder of ultra-fine limestone exists
Secondary total mill in ball mill, the time was at 30~40 minutes；To be milled and be kneaded in planetary-type mixer altogether, be kneaded the time 20~
35 minutes；The material being kneaded is sent into ball press balling-up；Green body is spontaneously dried 24~48 hours；Green body is finally put into high temperature
It is calcined in shaft furnace, temperature is 1900~2100 DEG C, keeps the temperature 5~9 hours, is broken into particle after cooling and obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.80~2.90g/cm3, porosity >
3.6%, closed porosity accounts for total porosity ratio 67%, and 0.2~0.3 μm of average pore size.
Embodiment 7
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 65wt%~70wt% and 25wt%~
The mixed powder of the ultra-fine magnesite of the light dolomite powder of 28wt% and 5wt%~7wt%, super fine bitter spar and ultra-fine limestone
For raw material.Water is added sufficiently to be digested in digester in light dolomite powder, amount of water accounts for the 20wt% of light dolomite powder
~30wt%, digestion time 30~45 hours；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder is sent into thunder to cover
Machine carries out total mill, 0.044 μm of the granularity < being milled altogether；Altogether milled mixed powder in be added ultra-fine magnesite, super fine bitter spar and
The mixed powder of ultra-fine limestone secondary total mill in the ball mill, the time was at 20~30 minutes；It will be milled altogether in planetary-type mixer
Middle kneading was kneaded the time at 35~50 minutes；The material being kneaded is sent into ball press balling-up；It is small that green body is spontaneously dried 48~72
When；Finally green body is put into high temperature vertical kiln and is calcined, temperature is 1750~1900 DEG C, keeps the temperature 8~12 hours, is broken into after cooling
Particle obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.90~3.00g/cm3, porosity >
3.3%, closed porosity accounts for total porosity ratio > 62%, and 0.05~0.15 μm of average pore size <.
Embodiment 8
A kind of micropore calcium magnesite and preparation method thereof.With the light-magnesite powder of 65wt%~70wt% and 25wt%~
The mixed powder of the ultra-fine magnesite of the light dolomite powder of 28wt% and 5wt%~7wt%, super fine bitter spar and ultra-fine limestone
For raw material.Water is added sufficiently to be digested in digester in light dolomite powder, amount of water accounts for the 30wt% of light dolomite powder
~40wt%, digestion time 45~60 hours；The mixed powder of postdigestive light dolomite powder and light-burning magnesium powder is sent into thunder to cover
Machine carries out total mill, 0.044 μm of the granularity < being milled altogether；Altogether milled mixed powder in be added ultra-fine magnesite, super fine bitter spar and
The mixed powder of ultra-fine limestone secondary total mill in the ball mill, the time was at 30~40 minutes；It will be milled altogether in planetary-type mixer
Middle kneading was kneaded the time at 20~35 minutes；The material being kneaded is sent into ball press balling-up；It is small that green body is spontaneously dried 24~48
When；Finally green body is put into high temperature vertical kiln and is calcined, temperature is 1900~2100 DEG C, keeps the temperature 5~9 hours, is broken into after cooling
Particle obtains micropore calcium magnesite.
Micropore calcium magnesite is through detecting prepared by the present embodiment: bulk density is 2.95~3.05g/cm3, porosity >
3.0%, closed porosity accounts for total porosity ratio > 60%, and 0.2~0.3 μm of average pore size.
It is to be provided for the embodiments of the invention a kind of micropore calcium magnesite and preparation method thereof to be described in detail above.
Principle and implementation of the present invention are described for specific embodiment used herein, and the explanation of embodiment is only intended to
It facilitates the understanding of the method and its core concept of the invention, the foregoing is merely illustrative of the preferred embodiments of the present invention, can not use
To limit the present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all be wrapped
Containing within protection scope of the present invention.
Claims (5)
1. a kind of micropore calcium magnesite, which is characterized in that be to be formulated by following raw material: the magnesia unslacked of 50wt%~70wt%
Powder, the light dolomite powder of 25wt%~40wt%, 5wt%~10wt% additive；The additive is carbonate micro mist,
The D50 value of the additive is 50~500nm.
2. a kind of micropore calcium magnesite according to claim 1, which is characterized in that the carbonate micro mist is ultra-fine magnesite
One or more of powder, superfine dolomite dust, super-fine limestone powder.
3. a kind of micropore calcium magnesite according to claim 1, which is characterized in that the light-burning magnesium powder principal crystalline phase is square magnesium
Stone, content of MgO > 95wt%, impurity content < 2wt%, IL < 3wt%, light-burning magnesium powder partial size≤0.088mm.
4. a kind of micropore calcium magnesite according to claim 1, which is characterized in that the light dolomite powder principal crystalline phase is side
Magnesite and square calcium stone, content of MgO > 42wt%, CaO content > 55wt%, impurity content < 1wt%, IL < 2wt% are light-burned white
Marble dust partial size≤0.088mm.
5. it is a kind of claim 1-4 its any one of as described in micropore calcium magnesite preparation method, which is characterized in that including
Following steps:
1) by light dolomite powder in digester plus water sufficiently digested, amount of water for light dolomite powder 20wt%~
40wt%, digestion time 30~60 hours；
2) mixed powder of postdigestive light dolomite powder and light-burning magnesium powder feeding Raymond machine is subjected to total mill, the granularity being milled altogether
0.044 μm of <；
3) carbonate micro mist secondary total mill in the ball mill is added in the mixed powder of milled altogether, the time was at 20~40 minutes；
4) it will be milled altogether obtained in step 3) and be kneaded in planetary-type mixer, be kneaded the time at 20~50 minutes；
5) material being kneaded is sent into ball press balling-up；Green body is spontaneously dried 24~72 hours；Green body is finally put into high temperature
It is calcined in shaft furnace, temperature is 1750 DEG C~2100 DEG C, keeps the temperature 5~12 hours, is broken into particle after cooling and obtains micropore calcium magnesite.
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