CN112851353A - Microcrystal metal ceramic plate and production process thereof - Google Patents

Microcrystal metal ceramic plate and production process thereof Download PDF

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Publication number
CN112851353A
CN112851353A CN202110075054.4A CN202110075054A CN112851353A CN 112851353 A CN112851353 A CN 112851353A CN 202110075054 A CN202110075054 A CN 202110075054A CN 112851353 A CN112851353 A CN 112851353A
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microcrystalline
plate
temperature
microcrystal
namely
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蒋永琪
李亮
查正祺
陈永
徐春南
李汉良
王嘉昊
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Zhejiang Zhenghao Refractories Co
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Zhejiang Zhenghao Refractories Co
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Abstract

The invention discloses a microcrystalline metal ceramic plate, which comprises a component body and a first connecting piece for fixing the component body on a mounting surface, wherein the component body comprises a microcrystalline plate and a prefabricated piece fixed on one side of the microcrystalline plate close to the mounting surface, so that the safety risk in the processes of cleaning and skinning and treating blocking accidents in the cement clinker production process can be fundamentally solved.

Description

Microcrystal metal ceramic plate and production process thereof
Technical Field
The invention relates to the technical field of cement production, in particular to a microcrystalline metal ceramic plate and a production process thereof.
Background
The crust generated in the cement kiln system is a stubborn disease which can not be avoided in the production process of the novel dry-method predecomposition kiln technology adopted in the cement production industry. The formation of crust can be caused by many reasons, such as raw fuel material quality, system air, system coal, temperature control, and process operation. It is known that only a small amount of harmful components volatilized during the clinker firing process are discharged into the atmosphere, and the rest of the harmful components are condensed on raw materials with lower temperature when moving to a low-temperature area of the kiln along with flue gas in the kiln. When the temperature rises, the volatile matter volatilizes, so that the cyclic enrichment is generated. When the circulation is enriched to a certain degree, low-melting-point compounds such as alkali chloride (RCI) and alkali sulfate (R2SO4) are generated to wrap part of raw meal powder and adhere to the inner wall of the smoke chamber and the cone part of the lowest two-stage preheater or the discharge pipe, and skinning is formed. When the skinning is serious, the ventilation of a system is influenced, and even a cyclone cylinder is blocked, so that the accident of stopping the kiln is caused, and the potential hazard is brought to the safety production; when the position of the smoke chamber is seriously skinned, the ventilation in the kiln is influenced, the fuel is incompletely combusted to form reducing atmosphere, and the yield and the clinker quality of the system are reduced; when the crusting in the decomposing furnace is serious, the negative pressure of the system is increased, the ventilation is not smooth, and the system pressure fluctuation, the material collapse and even the system blockage can be caused when the crusting falls down; the five-stage cyclone cylinder and the blanking pipe are skinned, which can seriously cause the blockage accident of the preheater and reduce the operation rate of the equipment.
In the event of kiln shutdown accidents of the rotary kiln process, the kiln shutdown accidents caused by material blockage of the preheater account for more than 70% of the total kiln shutdown accidents, and the fundamental reason of the blockage accidents of the preheater is that large-size crusts collapse accidentally, a blanking pipe is blocked, materials cannot pass smoothly and are accumulated, so that the crusts are prevented from growing in the preheater, and the blockage accidents are avoided to become the prominent problem of kiln process management.
The microcrystalline metal ceramic plate and the production process thereof are needed to solve the problems that a smoke chamber and a feeding pipe of a preheater are easy to crust or block and are difficult to clean.
Disclosure of Invention
In order to solve the problems, the invention provides a microcrystalline metal ceramic plate and a production process thereof.
The utility model provides a micrite metal ceramic board, its is including subassembly body and be used for being fixed in the first connecting piece on the installation face with the subassembly body, the subassembly body is including micrite board and be fixed in the prefab that the micrite board is close to the one side of installation face.
Preferably, a limit groove is formed in one side, close to the microcrystalline plate, of the prefabricated member, and a limit protrusion matched with the limit groove in size and shape is formed on the microcrystalline plate.
Preferably, the limiting groove is a dovetail groove.
Preferably, the assembly body is provided with a mounting groove, and a second connecting piece used for connecting the microcrystalline plate and the prefabricated member is fixed in the mounting groove.
Preferably, an assembly limiting groove is formed in one side of the assembly body, and an assembly limiting protrusion matched with the assembly limiting groove is formed in the opposite side of the assembly body.
A production process of a microcrystalline metal ceramic plate comprises the following specific steps:
s1: manufacture of a microcrystalline board
The first step is as follows: preparing materials, namely taking silicon carbide, silicon nitride, metal silicon and an additive;
the second step is that: mixing materials, namely mixing the raw materials in the first step;
the third step: performing mechanical pressing molding, namely mechanically pressing the mixed raw materials in the second step into a microcrystal plate blank;
the fourth step: drying the blank, and naturally drying the microcrystalline plate blank formed by the mechanical pressing in the third step;
the fifth step: putting the microcrystalline plate blank dried in the fourth step into a kiln for firing and forming;
s2: making prefabricated parts
The first step is as follows: preparing materials, namely taking mullite aggregate, corundum, fine alumina powder, pure calcium aluminate cement and an additive;
the second step is that: mixing materials, namely mixing the raw materials in the first step;
the third step: casting molding, namely casting the raw materials which are stirred and mixed in the second step into a prefabricated member blank in a mold;
the fourth step; naturally curing, namely naturally curing the prefabricated part blank molded by casting in the third step;
the fifth step: low-temperature baking, namely baking the prefabricated part blank which is subjected to natural curing in the fourth step in a kiln at low temperature;
s3: combination of
Combining the microcrystalline plate produced in the step S1 with the prefabricated member produced in the step 2 and fixing the two into an assembly body;
s4: installing the first connecting piece
And fixedly mounting a first connecting piece on the assembly body which is combined and fixed in the step S3.
Preferably, the ratio of the raw materials for preparing the microcrystalline plate in step S1 is 75% to 85% of silicon carbide, 3% to 8% of silicon nitride, 3% to 8% of metal silicon, and 3% to 5% of an additive.
Preferably, the raw material mixture ratio for manufacturing the prefabricated member (2) in the step S2 is 65-75% of mullite aggregate, 8-14% of corundum, 12-16% of alumina fine powder, 3-5% of pure calcium aluminate cement and 3-5% of additive.
Preferably, the temperature for baking the microcrystalline plate (1) manufactured in the step S1 in the kiln is 1450-1500 ℃, and the time is 12-24 h; finally, the temperature is preserved at 1450-1500 ℃, and the temperature preservation time is 24-36 h.
Preferably, the low-temperature baking step of fabricating the preform in step S2 is specifically:
(1) firstly, baking the preform body in a kiln for 4-5 h, wherein the baking temperature is gradually increased from normal temperature to 110 ℃, and the heating speed is 20-30 ℃/h;
(2) preserving heat at the temperature of 100-120 ℃ and standing for 23-26 h;
(3) gradually raising the baking temperature from the temperature kept in the step (2) to 300 ℃, wherein the raising speed is 10-15 ℃/h, and the time is 13-20 h;
(4) preserving the heat at 290-310 ℃ for 23-26 h.
The invention has the beneficial effects that:
(1) the invention discloses a microcrystal metal ceramic plate, which can fundamentally solve the safety risks existing in the process of cleaning and blocking accidents in the production process of cement clinker, and simultaneously, the microcrystal plate and a prefabricated part are manufactured into a whole, so that the procedures of pouring a castable and baking at low temperature in the existing installation and construction process of microcrystal materials are saved, the construction is more convenient, the labor intensity is reduced, the problem of material explosion is avoided, and the zero-accident operation of a kiln system process is effectively guaranteed.
(2) The invention discloses a microcrystal metal ceramic plate, wherein a microcrystal plate and a prefabricated part are clamped in a limit groove through a limit bulge and are bonded and fixed through an adhesive, and meanwhile, a second connecting piece is arranged for connection and fixation.
(3) The invention discloses a microcrystal metal ceramic plate, wherein a first connecting piece and a second connecting piece are both positioned in a mounting groove and are separated by cement, so that a heat preservation effect can be achieved.
(4) The invention discloses a production process of a microcrystalline metal ceramic plate, the produced microcrystalline metal ceramic plate is resistant to material skinning and coking, high in strength, good in wear resistance, reasonable and novel in structure and convenient to install, the microcrystalline plate and a prefabricated part are assembled and fixed and sold as a whole, the microcrystalline plate has excellent performances of high temperature resistance, corrosion resistance, good thermal stability and the like, the prefabricated part plays a role in supporting and temperature gentle transition, and meanwhile, the cost of the microcrystalline metal ceramic plate can be reduced to the maximum extent.
Drawings
Fig. 1 is a perspective view of a microcrystalline metal ceramic plate according to the present invention;
FIG. 2 is a perspective view of a preform;
FIG. 3 is a three-dimensional structure of a microcrystal plate;
fig. 4 is a schematic view showing the mounting effect of a microcrystalline metal ceramic plate according to the present invention.
In the figure: the structure comprises a microcrystalline board 1, a prefabricated part 2, a first connecting piece 3, a limiting groove 4, a limiting bulge 5, a mounting groove 6, a second connecting piece 7, an assembling limiting groove 8 and an assembling limiting bulge 9.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The utility model provides a micrite metal ceramic board, its is including the subassembly body and be used for being fixed in the first connecting piece 3 on the installation face with the subassembly body, first connecting piece 3 is fixed for the welded mode with the installation face, the subassembly body is including micrite board 1 and be fixed in the prefab 2 that micrite board 1 is close to one side of installation face, be close to on the prefab 2 spacing groove 4 has been seted up to one side of micrite board 1, the shaping has big or small shape on the micrite board 1 with spacing protruding 5 of 4 matched with of spacing groove, spacing groove 4 is the dovetail, and is fixed with micrite board 1 and prefab 2 bonding through the binder at last in spacing groove 4 on prefab 2 through the spacing protruding 5 card on the micrite board 1. Mounting groove 6 has been seted up to subassembly body upper surface, mounting groove 6 internal fixation has the second connecting piece 7 that is used for connecting microcrystalline board 1 and prefab 2, first connecting piece 3 also is located in mounting groove 6 and be close to the one side of installation face, first connecting piece 3 all is located mounting groove 6 with second connecting piece 7 so that do not influence the pile of micrite metal ceramic plate, just first connecting piece 3 is the metal material with second connecting piece 7 and both separate through cement to can play heat retaining effect, because in micrite metal ceramic plate use, inside heat can't reach the installation face through first connecting piece 3 rethread after leading to second connecting piece 7 from micrite board 1 on, thereby also cut off the heat through this kind of method of wall, reach heat retaining effect. In the long-term use process of the microcrystalline metal ceramic plate, after the adhesive between the microcrystalline plate 1 and the prefabricated part 2 loses efficacy, the microcrystalline plate 1 and the prefabricated part 2 are fixedly connected through the second connecting piece 7, even if the second connecting piece 7 is damaged due to oxidation, the microcrystalline plate 1 cannot fall off from the prefabricated part 2 due to the fact that the limiting bulge 5 is clamped in the limiting groove 4, the service life of the microcrystalline metal ceramic plate is greatly prolonged, and the phenomenon that microcrystalline materials on the existing market fall off due to damage of the connecting piece is solved.
Specifically, as shown in fig. 1, the assembly limit groove 8 has been seted up on the right side of subassembly body, its relative one side shaping have with the spacing arch 9 of assembly limit groove 8 matched with equipment to the in-process of piling up a micrite metal ceramic plate can carry out quick and accurate equipment in the assembly limit groove 8 through the spacing protruding 9 card of will assembling, has improved the convenient degree and the speed of construction greatly.
Specifically, the thickness D of the microcrystalline plate 1 is 40-45 mm, the microcrystalline plate 1 has excellent performances of high temperature resistance, corrosion resistance, good thermal stability and the like, and the prefabricated part 2 plays a role in supporting and temperature smooth transition and can reduce the cost of the microcrystalline metal ceramic plate to the maximum extent.
Specifically, a microcrystal component disclosed in patent with publication number CN211977586U specifically comprises a microcrystal plate and a microcrystal pull column, and is used for solving the bonding problem between a crust and a lining material, but the patent document discloses a practical method of the microcrystal component, namely that the microcrystal component directly replaces a kiln tail smoke chamber lining formed by an original castable or a refractory brick when in use, if the microcrystal component is directly installed on an installation surface, and a heat insulation plate is installed between the installation surface and the microcrystal component, but the castable is not poured, when the temperature in a kiln is too high, the phenomenon that the heat insulation plate is burnt out due to the fact that high temperature is directly transmitted to the heat insulation plate through the microcrystal component occurs, or if the purpose of not burning out the heat insulation plate is achieved, the microcrystal component needs to be made very thick, but the production cost is greatly improved in this way, the market prospect is greatly hindered, and the conventional construction mode in the field is that the microcrystal component is installed on site, need install the heated board between micrite subassembly and installation face, need pour the pouring material between heated board and micrite subassembly, the effect of pouring the pouring material is unanimous with the effect of the prefab 2 of this application file, not only can play the effect of support, can let the temperature transition gently simultaneously, practices thrift the cost in addition. The microcrystalline metal ceramic plate of the present invention has at least the following differences:
firstly, the heat insulation plate is installed for heat insulation and preservation, but the microcrystal pull column is directly connected with the installation surface, and heat can still be conducted to the installation surface through the microcrystal pull column, so that the heat insulation effect of the microcrystal metal ceramic plate is not the same as that of the microcrystal metal ceramic plate.
Secondly, the castable is required to be baked at low temperature after being poured, and the phenomenon of material frying can occur if the castable is directly used on site without being baked at low temperature.
A production process of a microcrystalline metal ceramic plate comprises the following specific steps:
s1: production of a microcrystal plate 1
The first step is as follows: preparing materials, namely taking 75-85% of silicon carbide, 3-8% of silicon nitride, 3-8% of metal silicon and 3-5% of an additive, wherein the additive is used for improving the strength and the wear resistance of a product and simultaneously increasing the anti-skinning performance, and the additive can be SEED.
The second step is that: mixing materials, namely stirring and mixing the raw materials in the first step;
the third step: performing mechanical pressing molding, namely performing mechanical pressing on the mixed raw materials in the second step into a microcrystalline plate blank according to a required model of the microcrystalline plate 1;
the fourth step: drying the blank, and naturally drying the microcrystalline plate blank formed by the mechanical pressing in the third step;
the fifth step: putting the dried microcrystalline plate blank in the fourth step into a kiln for firing and forming, wherein the firing temperature is 1450-1500 ℃, and the firing time is 12-24 hours; finally, the temperature is kept at 1450-1500 ℃, the temperature keeping time is 24-36 h, the microcrystal wear-resistant ceramic composite crystal phase is generated by the reaction under the high-temperature sintering, the surface of the prepared microcrystal plate 1 does not generate the eutectic reaction with other materials under the high-temperature state, and the ideal anti-skinning and wear-resistant effects are achieved;
s2: production of a preform 2
The first step is as follows: preparing materials, namely taking 65-75% of mullite aggregate, 8-14% of corundum, 12-16% of alumina fine powder, 3-5% of pure calcium aluminate cement and 3-5% of an additive, wherein the additive is used for the thermal shock resistance and explosion prevention, and can be SD 303;
the second step is that: mixing materials, namely mixing the raw materials in the first step;
the third step: casting molding, namely casting the raw materials which are stirred and mixed in the second step into a prefabricated member blank in a mold;
the fourth step; naturally curing, namely naturally curing the prefabricated part blank molded by casting in the third step;
the fifth step: and (3) low-temperature baking, namely, baking the prefabricated part blank which is subjected to natural curing in the fourth step in a kiln at a low temperature, wherein the method comprises the following specific steps:
(1) firstly, baking the preform body in a kiln for 4-5 h, wherein the baking temperature is gradually increased from normal temperature to 110 ℃, and the heating speed is 20-30 ℃/h;
(2) preserving heat at the temperature of 100-120 ℃ and standing for 23-26 h;
(3) gradually raising the baking temperature from the temperature kept in the step (2) to 300 ℃, wherein the raising speed is 10-15 ℃/h, and the time is 13-20 h;
(4) preserving heat at 290-310 ℃ and standing for 23-26 h;
s3: combination of
Combining the microcrystalline plate 1 prepared in the step S1 with the prefabricated part 2 prepared in the step S2, bonding and fixing the microcrystalline plate 1 and the prefabricated part 2 through a bonding agent to form an assembly body, and finally, further connecting and fixing the microcrystalline plate 1 and the prefabricated part 2 through a second connecting piece 7, wherein one end of the second connecting piece 7 is bonded and fixed on the microcrystalline plate 1, and the other end of the second connecting piece 7 is bonded and fixed on the prefabricated part 2;
s4: mounting the first connecting member 3
And (5) fixedly mounting the first connecting piece 3 on the assembly body after the assembly is combined and fixed in the step (S3), wherein the third connecting piece 3 is used for welding and fixing the assembly body and the mounting surface during construction and installation.
According to the production process of the microcrystalline metal ceramic plate, the produced microcrystalline metal ceramic plate has the following advantages:
1. excellent anti-skinning performance; because the surface of the material is compact with an oxide layer and the outer surface is smooth, the external material does not react with the material and is not adhered to the surface layer of the material;
2. the wear resistance is excellent: the wear resistance is 0.025-0.03 g/cm2, and the wear resistance is more than 6 times that of other wear-resistant castable materials;
3. the high-temperature performance is stable: the high-temperature thermal shock resistance experiment is not damaged for more than 10 times under the water cooling condition of 950 ℃, and can not be damaged under the severe fluctuation of the temperature from 1250 ℃ to 100 ℃;
4. high temperature resistance; the sintering temperature of the microcrystalline cermet material is above 1450 ℃, and the high temperature resistance of the microcrystalline cermet material can reach 1400 ℃ after long-term use;
5. acid and alkali corrosion resistance: because a compact oxide layer is formed on the surface of the material, the material has excellent medium-high temperature acid and alkali corrosion resistance;
6. the installation and construction are convenient: the microcrystal plate 1 and the prefabricated part 2 are sold as a whole, the construction process is simple and convenient, and the method is very suitable for high-temperature, acid-base and frequent-temperature-change parts such as a decomposing furnace smoke chamber, a preheater blanking pipe and the like in a cement production system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A microcrystalline cermet plate, comprising: the assembly comprises an assembly body and a first connecting piece (3) used for fixing the assembly body on a mounting surface, wherein the assembly body comprises a microcrystalline board (1) and a prefabricated piece (2) fixed on one side, close to the mounting surface, of the microcrystalline board (1).
2. A microcrystalline cermet plate as claimed in claim 1, characterised in that: a limiting groove (4) is formed in one side, close to the microcrystalline plate (1), of the prefabricated part (2), and a limiting protrusion (5) which is matched with the limiting groove (4) in size and shape is formed on the microcrystalline plate (1).
3. A microcrystalline cermet plate as claimed in claim 2, characterised in that: the limiting groove (4) is a dovetail groove.
4. A microcrystalline cermet plate as claimed in claim 1, characterised in that: the component body is provided with a mounting groove (6), and a second connecting piece (7) used for connecting the microcrystal plate (1) and the prefabricated part (2) is fixed in the mounting groove (6).
5. A microcrystalline cermet plate as claimed in claim 1, characterised in that: an assembly limiting groove (8) is formed in one side of the assembly body, and an assembly limiting bulge (9) matched with the assembly limiting groove (8) is formed in the opposite side of the assembly body.
6. A production process of a microcrystal metal ceramic plate is characterized by comprising the following steps: the method comprises the following specific steps:
s1: manufacture of a microcrystal board (1)
The first step is as follows: preparing materials, namely taking silicon carbide, silicon nitride, metal silicon and an additive;
the second step is that: mixing materials, namely mixing the raw materials in the first step;
the third step: performing mechanical pressing molding, namely mechanically pressing the mixed raw materials in the second step into a microcrystal plate blank;
the fourth step: drying the blank, and naturally drying the microcrystalline plate blank formed by the mechanical pressing in the third step;
the fifth step: putting the microcrystalline plate blank dried in the fourth step into a kiln for firing and forming;
s2: manufacturing prefabricated part (2)
The first step is as follows: preparing materials, namely taking mullite aggregate, corundum, fine alumina powder, pure calcium aluminate cement and an additive;
the second step is that: mixing materials, namely mixing the raw materials in the first step;
the third step: casting molding, namely casting the raw materials which are stirred and mixed in the second step into a prefabricated member blank in a mold;
the fourth step; naturally curing, namely naturally curing the prefabricated part blank molded by casting in the third step;
the fifth step: low-temperature baking, namely baking the prefabricated part blank which is subjected to natural curing in the fourth step in a kiln at low temperature;
s3: combination of
Combining the microcrystalline board (1) prepared in the step S1 with the prefabricated part (2) prepared in the step 2 and fixing the two into an assembly body;
s4: installation first connecting piece (3)
And (5) fixedly mounting the first connecting piece (3) on the assembly body which is combined and fixed in the step (S3).
7. A process for the production of a microcrystalline cermet plate as claimed in claim 6, characterised in that: the raw material proportion for manufacturing the microcrystal plate (1) in the step S1 is 75-85% of silicon carbide, 3-8% of silicon nitride, 3-8% of metal silicon and 3-5% of additive.
8. A process for the production of a microcrystalline cermet plate as claimed in claim 6, characterised in that: the raw material mixture ratio of the prefabricated member (2) manufactured in the step S2 is 65-75% of mullite aggregate, 8-14% of corundum, 12-16% of alumina fine powder, 3-5% of pure calcium aluminate cement and 3-5% of additive.
9. A process for the production of a microcrystalline cermet plate as claimed in claim 6, characterised in that: in the step S1, the temperature for baking the microcrystalline plate (1) in the kiln is 1450-1500 ℃, and the time is 12-24 h; finally, the temperature is preserved at 1450-1500 ℃, and the temperature preservation time is 24-36 h.
10. A process for the production of a microcrystalline cermet plate as claimed in claim 6, characterised in that: the low-temperature baking for manufacturing the prefabricated part (2) in the step S2 specifically comprises the following steps:
(1) firstly, baking the preform body in a kiln for 4-5 h, wherein the baking temperature is gradually increased from normal temperature to 110 ℃, and the heating speed is 20-30 ℃/h;
(2) preserving heat at the temperature of 100-120 ℃ and standing for 23-26 h;
(3) gradually raising the baking temperature from the temperature kept in the step (2) to 300 ℃, wherein the raising speed is 10-15 ℃/h, and the time is 13-20 h;
(4) preserving the heat at 290-310 ℃ for 23-26 h.
CN202110075054.4A 2021-01-20 2021-01-20 Microcrystal metal ceramic plate and production process thereof Pending CN112851353A (en)

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Application publication date: 20210528