CN110219823B - Slurry pump for resisting acidic and high-temperature environments and preparation method thereof - Google Patents

Slurry pump for resisting acidic and high-temperature environments and preparation method thereof Download PDF

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CN110219823B
CN110219823B CN201910571704.7A CN201910571704A CN110219823B CN 110219823 B CN110219823 B CN 110219823B CN 201910571704 A CN201910571704 A CN 201910571704A CN 110219823 B CN110219823 B CN 110219823B
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ceramic
silicon carbide
guard plate
metal body
pump
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CN110219823A (en
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李秋南
刘凯
王惠民
陈敬
黄涛
阳白梅
邢彧
李再勇
余小峰
赵红飞
汪红刚
潘帅
张利军
贾俊
胡正坤
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Hanjiang Hongyuan Xiangyang Silicon Carbide Special Ceramics Co ltd
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Hanjiang Hongyuan Xiangyang Silicon Carbide Special Ceramics Co ltd
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Priority to CN201910571704.7A priority Critical patent/CN110219823B/en
Publication of CN110219823A publication Critical patent/CN110219823A/en
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Priority to PCT/CN2020/096236 priority patent/WO2020259343A1/en
Publication of CN110219823B publication Critical patent/CN110219823B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract

The invention relates to the technical field of slurry pumps, and discloses a slurry pump for resisting acidic and high-temperature environments, which comprises a pump shell, a front guard plate, an impeller and a rear guard plate, wherein the pump shell, the front guard plate, the impeller and the rear guard plate respectively comprise a ceramic layer, a silicon carbide composite bonding layer and a metal body, the silicon carbide composite bonding layer is positioned between the ceramic layer and the metal body, and the volume density of the silicon carbide composite bonding layer is 2.65-2.9g/cm3The outer surface of the metal body and the inner wall of the ceramic layer opposite to the metal body are both provided with treatment layers, and the treatment layers comprise the following components in parts by mass: 20-40 parts of silicon carbide powder below 200 meshes; 60-80 parts of vinyl ester resin; 0.1-0.5 part of an accelerator; 0.5-1 part of curing agent; 0.2-0.5 part of defoaming agent; 0.2-0.5 part of leveling agent; 1-2 parts of a coupling agent. The invention can be suitable for different working conditions.

Description

Slurry pump for resisting acidic and high-temperature environments and preparation method thereof
Technical Field
The invention relates to the technical field of slurry pumps, in particular to a slurry pump for resisting acidic and high-temperature environments and a preparation method thereof.
Background
The overflow components of domestic slurry pumps are basically made of metal materials. The main components of the metal pump are nonferrous metals, so the metal pump is high in price, is corroded in a strong oxidation medium containing halogen elements such as dilute sulfuric acid and chloride ions, cannot meet the requirements of working conditions, and is short in service life; engineering plastic materials such as fluoroplastics and high molecular weight polyethylene have excellent corrosion resistance, but the mechanical strength of the materials is not high, the materials generally have a composite effect with metal materials, and because the thermal expansion coefficients of the materials are different from those of the metal materials, the plastic and the metal materials can be peeled off in a medium with higher temperature, so that pump parts can be damaged, the use temperature of the materials is limited, the plastic materials are soft and cannot be used for a medium containing more solid particles, the materials are generally subjected to compression molding, and the cost of a mold also limits the use of the materials in the manufacture of large pumps. (metallic materials are wear resistant but not corrosion resistant, rubber materials are corrosion resistant but not wear resistant)
The silicon carbide ceramic has excellent wear resistance and acid and alkali resistance, but has many problems when the ceramic is applied to a slurry pump and is large-sized: the silicon carbide ceramic is large-sized, the manufacturing difficulty and the cost are increased in geometric multiple, and the size of an impeller of a pump using the silicon carbide ceramic in the current market is not more than 300 mm; the performances of strong abrasion resistance and impact resistance of the silicon carbide ceramic material need to be further improved, and the maximum size of slurry conveying particles of a ceramic pump developed in the current market is not more than 2 mm; the silicon carbide ceramic has certain air holes, so that the slurry has a leakage problem.
The silicon nitride and silicon carbide materials in the silicon carbide ceramic material can realize the manufacture of large-scale and special-shaped ceramic pump parts, and the realization of products can be finished by adopting the existing slip casting process and the existing casting process at present. However, in order to ensure the stability of the grouting slurry, the raw material has no large-particle aggregate, the grouting water content is more than 16%, the green body strength of the product is low, and the shrinkage deformation of the product is large in the drying and sintering process of the product, the size precision is difficult to control, and cracks are easy to generate. The apparent porosity of the silicon nitride-silicon carbide combined ceramic material of the grouting product is more than 20 percent, and the volume density is 2.5g/cm3On the left and right sides, the existence of the air hole with the normal temperature rupture strength of 40MPa leads to the contact area greatly increased of the material and the transported slurry, reduces the corrosion resistance of the material, can not solve the leakage problem of the material, and the wear resistance of the product can not meet the requirements far away. Is poured intoThe molding moisture of the molding process can be controlled to be about 10 percent, the apparent porosity of the silicon nitride and silicon carbide combined ceramic material of the cast product is about 15 percent, and the volume density is 2.65g/cm3The normal temperature rupture strength is about 50MPa, the material performance is improved to a certain extent compared with the grouting forming process, but in the field of large heavy slurry pumps with worse working conditions, such as a conveying slurry concentration process section, the slurry has strong acid corrosion, the temperature of some slurry is between 80 and 95 ℃, under the working condition environment, a ceramic pump is required to have good acid resistance, high temperature resistance and impact resistance, and the current domestic and foreign ceramic pumps can not meet the performance requirements of the working conditions on the material.
Disclosure of Invention
The invention aims to provide a slurry pump for resisting acidic and high-temperature environments and a preparation method thereof, and aims to solve the problem that the conventional slurry pump cannot meet the working condition requirement.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a sediment stuff pump for defending acidity and high temperature environment, includes pump case, apron plate, impeller and backplate, the pump case the apron plate the impeller and the backplate all includes ceramic layer, the compound adhesive linkage of carborundum and metal body, the compound adhesive linkage of carborundum is located the ceramic layer with between the metal body, the bulk density of the compound adhesive linkage of carborundum is 2.65-2.9g/cm3The outer surface of the metal body and the inner wall of the ceramic layer opposite to the metal body are both provided with treatment layers, and the treatment layers comprise the following components in parts by mass:
Figure GDA0002454750380000021
the invention is further provided with: the front guard plate and the rear guard plate are buckled with the pump shell.
The present invention also provides a method of making a slurry pump as described in any one of the above for resisting acidic and high temperature environments, comprising the steps of:
s1, preparing a castable, and mixing the castable for later use;
s2, assembling and fixing the die, and fixing the assembled die on a high-frequency vibration forming machine, wherein the die is provided with a forming cavity;
s3, casting and molding, starting a high-frequency vibration molding machine, and pouring the casting material into a molding cavity from a feed opening on the mold until the whole cavity is filled with the casting material;
s4, demolding, namely, standing the molded blank for 1-2 hours, and demolding;
s5, drying and trimming the demolded blank;
s6, firing and forming, namely placing the dried blank into a high-temperature nitriding furnace, introducing nitrogen, gradually heating to 1400-1500 ℃ for nitriding and firing to obtain a silicon nitride and silicon carbide combined ceramic structural member;
s7, performing surface treatment on the ceramic structural member to remove floating ash, then injecting the enhanced sealing liquid into the ceramic structural member, and curing for 6-12 hours at 60-120 ℃;
s8, interface processing: coating one or more treatment layers on the surface of the ceramic structural member treated by the S7, curing at 60-120 ℃ for 3-8 hours, coating one or more treatment layers on the surface of the metal body, and curing at 60-120 ℃ for 3-6 hours;
s9, compounding the ceramic structure and the metal body: the method comprises the steps of assembling a ceramic structure and a metal body into a whole, filling silicon carbide composite bonding slurry into a gap between the ceramic structure and the metal body through high pressure, and after filling, placing at 60-120 ℃ for curing for 6-12 hours to respectively obtain a silicon carbide ceramic composite impeller, a front guard plate, a rear guard plate and a pump shell;
s10, assembling the combined impeller, front guard plate, rear guard plate and pump shell with metal joint plate, mechanical seal and bracket into a complete slurry pump;
the casting material in S1 comprises the following components in parts by mass
Figure GDA0002454750380000031
The invention is further provided with: the silicon carbide sand comprises the following components in parts by mass:
Figure GDA0002454750380000032
the invention is further provided with: and in the S5, the demolded blank is placed at the temperature of 35-60 ℃ for 24-36 hours, then fettling is carried out, and then drying is carried out at the temperature of 100-140 ℃ for 24-48 hours after fettling.
The invention is further provided with: the process of introducing nitrogen to gradually increase the temperature in the step S6 is as follows:
s61, raising the temperature to 450-550 ℃ at the speed of 20-50 ℃/h, and keeping the temperature for 6-10 h;
s62, raising the temperature to 850-;
s63, raising the temperature to 1050-;
s64, raising the temperature to 1250-1350 ℃ at the speed of 20-45 ℃/h, and keeping the temperature for 1-3 h;
s65, raising the temperature to 1400 ℃ and 1500 ℃ at the speed of 20-40 ℃/h, and keeping the temperature for 5-9 h;
and S66, naturally cooling to room temperature.
The invention is further provided with: the reinforced sealing liquid comprises nano inorganic particles, silica sol, resin, a defoaming agent, a coupling agent, a curing agent and a solvent.
The invention is further provided with: the silicon carbide composite bonding slurry in the S9 comprises the following components in parts by mass:
Figure GDA0002454750380000041
the invention is further provided with: the resin in the silicon carbide composite bonding slurry in the S9 comprises one or a mixture of epoxy resin, vinyl ester resin, furan resin, polyester resin and bismaleimide resin.
The invention is further provided with: all be provided with the ceramic piece on the ceramic layer, the ceramic piece set up in on the partition tongue of pump case and inner chamber wall the front fender with the intermediate position department of backplate, the impeller is including connecting portion and the curved blade portion of a plurality of on the connecting portion, on the impeller the ceramic piece is located the tip that the blade portion is close to the connecting portion center.
The invention has the beneficial effects that: the pump case, the front guard plate, the cross section of impeller and backplate all have five layers of structures, namely the ceramic layer, handle the layer, the compound adhesive linkage of carborundum, handle layer and metallic member, the large-grained carborundum sand in the castable formula is as the aggregate, can improve the wear resistance of ceramic layer, and greatly reduced the required moisture of castable shaping, guarantee that slurry moisture is below 8%, through high-frequency vibration shaping, make the slurry can carry out certain flow, thereby can fill up the whole shaping die cavity of mould, not only make the mould stand for a short time, and the body still can have higher intensity, it is less still to have guaranteed that the material is firing the in-process shrinkage factor in the stoving, be difficult for producing the shrink crackle, can guarantee the size precision of large-scale ceramic spare very well. Because the ceramic layer has acid resistance, the part contacted with the acid liquor can better resist the acid solution when in work, meanwhile, the outer surface of the metal body is coated with the treatment layer, and the vinyl ester resin in the treatment layer has better acid resistance, so that even if part of the metal body is contacted with the acid liquor, the metal body can be better prevented from being corroded by the acid liquor, the integral acid resistance effect of the slurry pump is good, and the slurry pump can be suitable for the working conditions of more conditions.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment of an assembled substructure of a slurry pump for resisting acidic and high temperature environments of the present invention;
FIG. 2 is an exploded view of an embodiment of a slurry pump of the present invention for resisting acidic and high temperature environments, with x indicating the location of the ceramic block;
FIG. 3 is a schematic view of a first embodiment of a fastening structure of a front/rear guard and a pump housing of a slurry pump for resisting acidic and high temperature environments in accordance with the present invention;
FIG. 4 is a schematic view of a fastening structure of a front/rear guard and a pump housing of a slurry pump for resisting acidic and high-temperature environments according to the present invention;
FIG. 5 is a third schematic view of a fastening structure of the front/rear guard and the pump housing of the slurry pump for resisting acidic and high temperature environments of the present invention;
FIG. 6 is a fourth schematic view of a fastening structure of the front/rear guard and the pump housing of a slurry pump for resisting acidic and high temperature environments in accordance with the present invention.
In the drawings, 1, a pump casing; 2. a front guard plate; 3. an impeller; 4. a rear guard plate; a. a metal body; b. a ceramic layer; c. and a silicon carbide composite bonding layer.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
A slurry pump for resisting acidic and high-temperature environments, as shown in fig. 1 to 5, comprising a pump housing 1, a front guard plate 2, an impeller 3 and a rear guard plate 4, wherein the pump housing 1, the front guard plate 2, the impeller 3 and the rear guard plate 4 each comprise a ceramic layer b, a silicon carbide composite bonding layer c and a metal body a, the silicon carbide composite bonding layer c is located between the ceramic layer b and the metal body a, the outer surface of the metal body a and the ceramic layer b are opposite to the inner wall of the metal body a, and the treatment layer comprises the following components in parts by mass:
Figure GDA0002454750380000051
the front guard plate 2 and the rear guard plate 4 are buckled with the pump shell 1.
The invention also provides a preparation method of the slurry pump for resisting acidic and high-temperature environments, which comprises the following steps:
s1, preparing a castable, and mixing the castable for later use;
s2, assembling and fixing the die, and fixing the assembled die on a high-frequency vibration forming machine, wherein the die is provided with a forming cavity;
s3, casting and molding, starting a high-frequency vibration molding machine, and pouring the casting material into a molding cavity from a feed opening on the mold until the whole cavity is filled with the casting material;
s4, demolding, namely, standing the molded blank for 2 hours, and demolding;
s5, drying and trimming the demolded blank;
s6, firing and forming, namely placing the dried blank into a high-temperature nitriding furnace, introducing nitrogen, gradually heating to 1400 ℃ for nitriding and firing to obtain a silicon nitride-silicon carbide combined ceramic structural member;
s7, performing surface treatment on the ceramic structural member to remove floating ash, then injecting the enhanced sealing liquid into the ceramic structural member, and curing for 6 hours at 60 ℃;
s8, interface processing: coating one or more treatment layers on the surface of the ceramic structural member treated in the S7, curing at 60 ℃ for 8 hours, coating one or more treatment layers on the surface of the metal body a, and curing at 60 ℃ for 6 hours;
s9, combining the ceramic structure with the metal body a: the ceramic structure and the metal body a are assembled into a whole, the silicon carbide composite bonding slurry is filled into a gap between the ceramic structure and the metal body a through high pressure, and after the filling is finished, the gap is placed at 60 ℃ for curing for 12 hours to respectively obtain a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1;
s10, assembling the combined impeller 3, front guard plate 2, rear guard plate 4 and pump shell 1 with metal joint plate, mechanical seal and bracket to form a complete slurry pump;
the casting material in S1 comprises the following components in parts by mass
Figure GDA0002454750380000061
The silicon carbide sand comprises the following components in parts by mass:
Figure GDA0002454750380000062
and in the S5, the demolded blank is placed at 60 ℃ for 24 hours, then fettling is carried out, and then drying is carried out at 140 ℃ for 24 hours after fettling.
The process of introducing nitrogen to gradually increase the temperature in the step S6 is as follows:
s61, heating to 450 ℃ at the speed of 50 ℃/h, and keeping for 10 h;
s62, heating to 950 ℃ at the speed of 30 ℃/h, and keeping for 2 h;
s63, heating to 1050 ℃ at the speed of 50 ℃/h, and keeping for 12 h;
s64, heating to 1350 ℃ at the speed of 20 ℃/h, and keeping for 1 h;
s65, heating to 1400 ℃ at the speed of 40 ℃/h, and keeping for 9 h;
and S66, naturally cooling to room temperature.
The reinforced sealing liquid is prepared by the following steps: 4 parts of nano zirconia, 6 parts of nano aluminum nitride, 10 parts of nano titanium dioxide, 1 part of aluminum phosphate, 3 parts of sodium tripolyphosphate, 8 parts of silica sol, 2 parts of a coupling agent KH-560, 0.8 part of polyoxyethylene polyoxypropylene ether, 7 parts of acetone, 40 parts of ethanol, 35 parts of bismaleimide resin, 1.8 parts of methyl tetrahydrophthalic anhydride and 4 parts of hexahydrophthalic anhydride are uniformly mixed at 50 ℃.
The silicon carbide composite bonding slurry in the S9 comprises the following components in parts by mass:
Figure GDA0002454750380000071
the resin in the silicon carbide composite bonding slurry in the S9 is 10 parts of epoxy resin, the coupling agent is 3 parts of KH550, and the curing agent is 1 part of m-phenylenediamine.
Example 2
The utility model provides a sediment stuff pump for resisting acid and high temperature environment, includes pump case 1, apron plate 2, impeller 3 and backplate 4, pump case 1 the apron plate 2 impeller 3 and backplate 4 all includes ceramic layer b, the compound adhesive linkage c of carborundum and metal body a, the compound adhesive linkage c of carborundum is located ceramic layer b with between the metal body a, the surface of metal body a and ceramic layer b just right all be provided with the treatment layer on the inner wall of metal body a, by the part by mass the treatment layer is including following component:
Figure GDA0002454750380000072
the front guard plate 2 and the rear guard plate 4 are buckled with the pump shell 1.
The invention also provides a preparation method of the slurry pump for resisting acidic and high-temperature environments, which comprises the following steps:
s1, preparing a castable, and mixing the castable for later use;
s2, assembling and fixing the die, and fixing the assembled die on a high-frequency vibration forming machine, wherein the die is provided with a forming cavity;
s3, casting and molding, starting a high-frequency vibration molding machine, and pouring the casting material into a molding cavity from a feed opening on the mold until the whole cavity is filled with the casting material;
s4, demolding, namely, standing the molded blank for 1 hour, and demolding;
s5, drying and trimming the demolded blank;
s6, firing and forming, namely placing the dried blank into a high-temperature nitriding furnace, introducing nitrogen, gradually heating to 1500 ℃ for nitriding and firing to obtain a silicon nitride-silicon carbide combined ceramic structural member;
s7, performing surface treatment on the ceramic structural member to remove floating ash, then injecting the enhanced sealing liquid into the ceramic structural member, and curing for 6 hours at 100 ℃;
s8, interface processing: coating one or more treatment layers on the surface of the ceramic structural member treated in the step S7, curing the ceramic structural member at 120 ℃ for 3 hours, coating one or more treatment layers on the surface of the metal body a, and curing the metal body a at 120 ℃ for 3 hours;
s9, combining the ceramic structure with the metal body a: the ceramic structure and the metal body a are assembled into a whole, the silicon carbide composite bonding slurry is filled into a gap between the ceramic structure and the metal body a through high pressure, and after the filling is finished, the gap is placed at 120 ℃ for solidification for 6 hours, so that a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1 are respectively obtained;
s10, assembling the combined impeller 3, front guard plate 2, rear guard plate 4 and pump shell 1 with metal joint plate, mechanical seal and bracket to form a complete slurry pump;
the casting material in S1 comprises the following components in parts by mass
Figure GDA0002454750380000081
The silicon carbide sand comprises the following components in parts by mass:
Figure GDA0002454750380000082
and in the S5, the demolded blank is placed at 35 ℃ for 36 hours, then fettling is carried out, and then drying is carried out at 100 ℃ for 48 hours after fettling.
The process of introducing nitrogen to gradually increase the temperature in the step S6 is as follows:
s61, raising the temperature to 550 ℃ at the speed of 20 ℃/h, and keeping the temperature for 6 h;
s62, heating to 850 ℃ at the speed of 60 ℃/h, and keeping for 2 h;
s63, raising the temperature to 1150 ℃ at the speed of 30 ℃/h, and keeping the temperature for 6 h;
s64, raising the temperature to 1250 ℃ at the speed of 45 ℃/h, and keeping the temperature for 3 h;
s65, heating to 1500 ℃ at the speed of 20 ℃/h, and keeping for 5 h;
and S66, naturally cooling to room temperature.
The reinforced sealing liquid is prepared by the following steps: according to parts by mass, 3 parts of nano zirconia, 10 parts of nano aluminum nitride, 0.5 part of nano titanium dioxide, 5 parts of aluminum phosphate, 0.2 part of sodium tripolyphosphate, 5 parts of silica sol, 1 part of a coupling agent KH-540, 2 parts of polyoxyethylene polyoxypropylene pentaerythritol ether, 3 parts of cyclohexanone, 26 parts of cyclohexane, 12 parts of furan resin and 3 parts of phthalic anhydride are uniformly mixed at 18 ℃.
The silicon carbide composite bonding slurry in the S9 comprises the following components in parts by mass:
Figure GDA0002454750380000091
the resin in the silicon carbide composite adhesive slurry in S9 is 2 parts of vinyl ester resin and 2 parts of bismaleimide resin, the coupling agent is 1 part of KH792, and the curing agent is 2 parts of diethylenetriamine.
Example 3
The utility model provides a sediment stuff pump for resisting acid and high temperature environment, includes pump case 1, apron plate 2, impeller 3 and backplate 4, pump case 1 the apron plate 2 impeller 3 and backplate 4 all includes ceramic layer b, the compound adhesive linkage c of carborundum and metal body a, the compound adhesive linkage c of carborundum is located ceramic layer b with between the metal body a, the surface of metal body a and ceramic layer b just right all be provided with the treatment layer on the inner wall of metal body a, by the part by mass the treatment layer is including following component:
Figure GDA0002454750380000092
Figure GDA0002454750380000101
the front guard plate 2 and the rear guard plate 4 are buckled with the pump shell 1.
The invention also provides a preparation method of the slurry pump for resisting acidic and high-temperature environments, which comprises the following steps:
s1, preparing a castable, and mixing the castable for later use;
s2, assembling and fixing the die, and fixing the assembled die on a high-frequency vibration forming machine, wherein the die is provided with a forming cavity;
s3, casting and molding, starting a high-frequency vibration molding machine, and pouring the casting material into a molding cavity from a feed opening on the mold until the whole cavity is filled with the casting material;
s4, demolding, namely, standing the molded blank for 1.5 hours, and demolding;
s5, drying and trimming the demolded blank;
s6, firing and forming, namely placing the dried blank into a high-temperature nitriding furnace, introducing nitrogen, gradually heating to 1450 ℃, and carrying out nitriding firing to obtain a silicon nitride-silicon carbide combined ceramic structural member;
s7, performing surface treatment on the ceramic structural member to remove floating ash, then injecting the enhanced sealing liquid into the ceramic structural member, and curing for 9 hours at 80 ℃;
s8, interface processing: coating one or more treatment layers on the surface of the ceramic structural member treated in the step S7, curing the ceramic structural member at 80 ℃ for 5 hours, coating one or more treatment layers on the surface of the metal body a, and curing the metal body a at 110 ℃ for 5 hours;
s9, combining the ceramic structure with the metal body a: the ceramic structure and the metal body a are assembled into a whole, the silicon carbide composite bonding slurry is filled into a gap between the ceramic structure and the metal body a through high pressure, and after the filling is finished, the gap is placed at 80 ℃ for curing for 10 hours to respectively obtain a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1;
s10, assembling the combined impeller 3, front guard plate 2, rear guard plate 4 and pump shell 1 with metal joint plate, mechanical seal and bracket to form a complete slurry pump;
the casting material in S1 comprises the following components in parts by mass
Figure GDA0002454750380000102
The silicon carbide sand comprises the following components in parts by mass:
Figure GDA0002454750380000103
and in the S5, the demolded blank is placed at 45 ℃ for 30 hours, then fettling is carried out, and then drying is carried out at 110 ℃ for 36 hours after fettling.
The process of introducing nitrogen to gradually increase the temperature in the step S6 is as follows:
s61, heating to 500 ℃ at the speed of 30 ℃/h, and keeping for 8 h;
s62, heating to 900 ℃ at the speed of 40 ℃/h, and keeping for 3 h;
s63, heating to 1100 ℃ at the speed of 40 ℃/h, and keeping for 9 h;
s64, heating to 1300 ℃ at the speed of 30 ℃/h, and keeping for 2 h;
s65, heating to 1450 ℃ at the speed of 30 ℃/h, and keeping for 7 h;
and S66, naturally cooling to room temperature.
The reinforced sealing liquid is prepared by the following steps: according to parts by mass, 3 parts of nano zirconia, 12 parts of nano aluminum nitride, 2 parts of nano titanium dioxide, 3 parts of aluminum phosphate, 4 parts of sodium tripolyphosphate, 5 parts of silica sol, 1 part of coupling agent KH-540, 1 part of polydimethylsiloxane, 5 parts of n-butanol, 18 parts of n-propanol, 17 parts of vinyl resin, 2 parts of dibenzoyl peroxide and 1 part of tert-butyl peroxybenzoate are uniformly mixed at 33 ℃.
The silicon carbide composite bonding slurry in the S9 comprises the following components in parts by mass:
Figure GDA0002454750380000111
the resin in the silicon carbide composite bonding slurry in the S9 comprises 3 parts of furan resin and 2 parts of polyester resin, the coupling agent is 3 parts of KH550, and the curing agent is 2 parts of diaminocyclohexane DACH.
Example 4
The utility model provides a sediment stuff pump for resisting acid and high temperature environment, includes pump case 1, apron plate 2, impeller 3 and backplate 4, pump case 1 the apron plate 2 impeller 3 and backplate 4 all includes ceramic layer b, the compound adhesive linkage c of carborundum and metal body a, the compound adhesive linkage c of carborundum is located ceramic layer b with between the metal body a, the surface of metal body a and ceramic layer b just right all be provided with the treatment layer on the inner wall of metal body a, by the part by mass the treatment layer is including following component:
Figure GDA0002454750380000112
Figure GDA0002454750380000121
the front guard plate 2 and the rear guard plate 4 are buckled with the pump shell 1.
The invention also provides a preparation method of the slurry pump for resisting acidic and high-temperature environments, which comprises the following steps:
s1, preparing a castable, and mixing the castable for later use;
s2, assembling and fixing the die, and fixing the assembled die on a high-frequency vibration forming machine, wherein the die is provided with a forming cavity;
s3, casting and molding, starting a high-frequency vibration molding machine, and pouring the casting material into a molding cavity from a feed opening on the mold until the whole cavity is filled with the casting material;
s4, demolding, namely, standing the molded blank for 1.8 hours, and demolding;
s5, drying and trimming the demolded blank;
s6, firing and forming, namely placing the dried blank into a high-temperature nitriding furnace, introducing nitrogen, gradually heating to 1420 ℃, and carrying out nitriding firing to obtain a silicon nitride and silicon carbide combined ceramic structural member;
s7, performing surface treatment on the ceramic structural member to remove floating ash, then injecting the enhanced sealing liquid into the ceramic structural member, and curing for 10 hours at 70 ℃;
s8, interface processing: coating one or more treatment layers on the surface of the ceramic structural member treated in the step S7, curing at 105 ℃ for 7 hours, coating one or more treatment layers on the surface of the metal body a, and curing at 75 ℃ for 5 hours;
s9, combining the ceramic structure with the metal body a: the ceramic structure and the metal body a are assembled into a whole, the silicon carbide composite bonding slurry is filled into a gap between the ceramic structure and the metal body a through high pressure, and after the filling is finished, the gap is placed at 100 ℃ for curing for 11 hours to respectively obtain a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1;
s10, assembling the combined impeller 3, front guard plate 2, rear guard plate 4 and pump shell 1 with metal joint plate, mechanical seal and bracket to form a complete slurry pump;
the casting material in S1 comprises the following components in parts by mass
Figure GDA0002454750380000122
The silicon carbide sand comprises the following components in parts by mass:
Figure GDA0002454750380000123
and in the S5, the demolded blank is placed at 50 ℃ for 30 hours, then fettling is carried out, and then drying is carried out at 110 ℃ for 40 hours after fettling.
The process of introducing nitrogen to gradually increase the temperature in the step S6 is as follows:
s61, heating to 480 ℃ at the speed of 40 ℃/h, and keeping for 6.5 h;
s62, heating to 920 ℃ at the speed of 55 ℃/h, and keeping for 3.5 h;
s63, heating to 1120 ℃ at the speed of 40 ℃/h, and keeping for 7 h;
s64, heating to 1280 ℃ at the speed of 38 ℃/h, and keeping for 2.5 h;
s65, heating to 1420 ℃ at the speed of 22 ℃/h, and keeping for 8.5 h;
and S66, naturally cooling to room temperature.
The reinforced sealing liquid is prepared by the following steps: according to parts by mass, 6 parts of nano zirconia, 3 parts of nano aluminum nitride, 2 parts of nano titanium dioxide, 1 part of aluminum phosphate, 5 parts of sodium tripolyphosphate, 4 parts of silica sol, 8 parts of coupling agent KH-540, 2 parts of polydimethylsiloxane, 8 parts of n-butanol, 15 parts of n-propanol, 40 parts of epoxy resin, 1 part of dibenzoyl peroxide and 1 part of tert-butyl peroxybenzoate are uniformly mixed at 30 ℃.
The silicon carbide composite bonding slurry in the S9 comprises the following components in parts by mass:
Figure GDA0002454750380000131
the resin in the silicon carbide composite bonding slurry in the S9 is 3 parts of epoxy resin, 2 parts of furan resin and 1 part of polyester resin, the coupling agent is 5 parts of KH570, and the curing agent is 2 parts of N-aminoethyl piperazine.
The four binding agents in the same embodiment are all prepared from the following components in a mass ratio of 1: 1: 1: 1: CMC (sodium carboxymethylcellulose), PVA (polyvinyl alcohol), lignosulfonate, silica sol. The mass ratio of the additives is 1: 1: 1: 1: silicon iron powder, silicon micropowder, yttrium oxide and yttrium stabilized zirconia. And the front guard plate 2 and the rear guard plate 4 are buckled with the pump casing 1 in four buckling modes as shown in fig. 3 to 6, so that the sealing performance and the stability of the connection between the front guard plate 2 and the pump casing 1 and the connection between the rear guard plate 4 and the pump casing 1 can be improved.
The flow rates of the slurry pumps manufactured by the fourth embodiment are all 160-4500m3The lift is between 11 and 110m, the rotating speed is between 50 and 1550r/min, and the efficiency is between 65 and 82 percent. Adapted to the acid concentration (80% H)2SO4Or HF 5% or below, namely acid resistance), the concentration of chloride ions is less than or equal to 60000ppm, the weight concentration is less than or equal to 70%, the maximum particle size is less than or equal to 15mm, the conveying of the medium (with high temperature resistance) at the temperature of less than or equal to 100 ℃ is realized, and the service life of the medium under the same working condition and environment is 4 times that of the traditional pumpThe above. The ceramic layers of examples one to four had bulk densities of 2.75 to 2.95g/cm3The apparent porosity is less than or equal to 1 percent, the normal-temperature breaking strength reaches more than 100MPa, most of air holes of the silicon nitride and silicon carbide combined material are sealed, the contact area of silicon carbide particles and slurry with corrosion is effectively reduced, the slurry leakage is solved, and the acid-base corrosion resistance of the material is improved; silicon carbide large particles (2.3-6.7mm) are added into the silicon nitride and silicon carbide combined material, so that the strong abrasion resistance of the material is improved.
Meanwhile, the silicon carbide composite adhesive layer c adopts coarse, medium and fine silicon carbide particles as aggregate, and specific resin and additives are added, so that the slurry has good fluidity, can fill the gaps between the ceramic and the metal through high pressure, and is cured at the temperature of not higher than 120 ℃ to form the silicon carbide composite adhesive layer with the volume density of 2.65-2.9g/cm3Meanwhile, the bonding material with the normal-temperature rupture strength of more than or equal to 80MPa can bond the ceramic and the metal into a whole in a composite way.
In the first to the fourth embodiments, ceramic blocks (or inserts) may be further disposed on the pump casing 1, the front guard plate 2, the impeller 3, and the rear guard plate 4, where the ceramic blocks are disposed on the pump casing 1, the front guard plate 2, the impeller 3, and the rear guard plate 4 where the requirement for impact resistance is high, that is, on the partition tongue and the inner cavity wall of the pump casing 1, at the middle position of the guard plates, the impeller 3 includes a connecting portion and a plurality of arc-shaped blade portions (for driving liquid to move) on the connecting portion, and the ceramic blocks on the impeller 3 are located at the end portions of the blade portions near the center of the. The ceramic blocks at different positions are made of one of reaction sintered silicon carbide ceramic, pressureless sintered silicon carbide ceramic, recrystallized silicon carbide ceramic or ceramic of silicon nitride combined with silicon carbide and zirconium oxide, and other impact-resistant and wear-resistant ceramic materials or other materials can be selected according to actual conditions.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (10)

1. A slurry pump for resisting acidic and high temperature environments, comprising: the pump comprises a pump shell (1), a front guard plate (2), an impeller (3) and a rear guard plate (4), wherein the pump shell (1), the front guard plate (2), the impeller (3) and the rear guard plate (4) respectively comprise a ceramic layer (b), a silicon carbide composite bonding layer (c) and a metal body (a), the silicon carbide composite bonding layer (c) is positioned between the ceramic layer (b) and the metal body (a), and the volume density of the silicon carbide composite bonding layer (c) is 2.65-2.9g/cm3The outer surface of the metal body (a) and the inner wall of the ceramic layer (b) opposite to the metal body (a) are both provided with treatment layers, and the treatment layers comprise the following components in parts by mass:
Figure FDA0002454750370000011
2. the slurry pump for resisting acidic and high temperature environments of claim 1, wherein: the front guard plate (2) and the rear guard plate (4) are buckled with the pump shell (1).
3. A method of making a slurry pump for resisting acidic and high temperature environments as claimed in any one of claims 1 to 2, wherein: the method comprises the following steps:
s1, preparing a castable, and mixing the castable for later use;
s2, assembling and fixing the die, and fixing the assembled die on a high-frequency vibration forming machine, wherein the die is provided with a forming cavity;
s3, casting and molding, starting a high-frequency vibration molding machine, and pouring the casting material into a molding cavity from a feed opening on the mold until the whole cavity is filled with the casting material;
s4, demolding, namely, standing the molded blank for 1-2 hours, and demolding;
s5, drying and trimming the demolded blank;
s6, firing and forming, namely placing the dried blank into a high-temperature nitriding furnace, introducing nitrogen, gradually heating to 1400-1500 ℃ for nitriding and firing to obtain a silicon nitride and silicon carbide combined ceramic structural member;
s7, performing surface treatment on the ceramic structural member to remove floating ash, then injecting the enhanced sealing liquid into the ceramic structural member, and curing for 6-12 hours at 60-120 ℃;
s8, interface processing: coating one or more treatment layers on the surface of the ceramic structural member treated by the S7, curing for 3-8 hours at 60-120 ℃, coating one or more treatment layers on the surface of the metal body (a), and curing for 3-6 hours at 60-120 ℃;
s9, combining the ceramic structure with the metal body (a): the method comprises the steps of (1) assembling a ceramic structure and a metal body (a) into a whole, filling silicon carbide composite bonding slurry into a gap between the ceramic structure and the metal body (a) through high pressure, and after filling, placing the ceramic structure and the metal body at 60-120 ℃ for curing for 6-12 hours to respectively obtain a silicon carbide ceramic composite impeller (3), a front guard plate (2), a rear guard plate (4) and a pump shell (1);
s10, assembling the combined impeller (3), the front guard plate (2), the rear guard plate (4) and the pump shell (1) with a metal joint plate, a mechanical seal and a bracket into a complete slurry pump;
the casting material in S1 comprises the following components in parts by mass
Figure FDA0002454750370000021
4. A method of making a slurry pump for resisting acidic and high temperature environments as recited in claim 3, wherein: the silicon carbide sand comprises the following components in parts by mass:
Figure FDA0002454750370000022
5. the method of making a slurry pump for resisting acidic and high temperature environments of claim 4, wherein: and in the S5, the demolded blank is placed at the temperature of 35-60 ℃ for 24-36 hours, then fettling is carried out, and then drying is carried out at the temperature of 100-140 ℃ for 24-48 hours after fettling.
6. The method of making a slurry pump for resisting acidic and high temperature environments of claim 4, wherein: the process of introducing nitrogen to gradually increase the temperature in the step S6 is as follows:
s61, raising the temperature to 450-550 ℃ at the speed of 20-50 ℃/h, and keeping the temperature for 6-10 h;
s62, raising the temperature to 850-;
s63, raising the temperature to 1050-;
s64, raising the temperature to 1250-1350 ℃ at the speed of 20-45 ℃/h, and keeping the temperature for 1-3 h;
s65, raising the temperature to 1400 ℃ and 1500 ℃ at the speed of 20-40 ℃/h, and keeping the temperature for 5-9 h;
and S66, naturally cooling to room temperature.
7. The method of making a slurry pump for resisting acidic and high temperature environments of claim 4, wherein: the reinforced sealing liquid comprises nano inorganic particles, silica sol, resin, a defoaming agent, a coupling agent, a curing agent and a solvent.
8. The method of making a slurry pump for resisting acidic and high temperature environments of claim 4, wherein: the silicon carbide composite bonding slurry in the S9 comprises the following components in parts by mass:
Figure FDA0002454750370000031
9. the method of making a slurry pump for resisting acidic and high temperature environments of claim 8, wherein: the resin in the silicon carbide composite bonding slurry in the S9 comprises one or a mixture of epoxy resin, vinyl ester resin, furan resin, polyester resin and bismaleimide resin.
10. A method of making a slurry pump for resisting acidic and high temperature environments as recited in claim 3, wherein: all be provided with the ceramic piece on ceramic layer (b), the ceramic piece set up in on pump case (1) separate tongue and the inner chamber wall the front fender (2) with the intermediate position department of back backplate (3), impeller (3) are including connecting portion and the curved blade portion of a plurality of on the connecting portion, impeller (3) are last the ceramic piece is located the tip that the blade portion is close to the connecting portion center.
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