CN-118619689-B - Castable for preventing incineration waste gas from corroding inner wall of incinerator and preparation method thereof

Abstract

The invention relates to the technical field of refractory materials, in particular to a castable for preventing incineration waste gas from corroding the inner wall of an incinerator and a preparation method thereof, wherein the castable comprises the following components in parts by weight: 65-75 parts of composite aggregate, 8-10 parts of corrosion-resistant latex, 1-2 parts of binder, 3-5 parts of aluminum powder paste, 1-3 parts of expanded perlite and 2-3 parts of glass fiber; the preparation method comprises the following steps: s1, premixing aggregate, S2, premixing powder, S3, casting and forming, and S4, post-treatment; the invention solves the problems that the acid castable is not alkali-proof, is easy to become crisp in a wet environment and has invalid anti-corrosion performance in the prior art by preparing the anti-corrosion latex which has the advantages of remarkably improved anti-corrosion performance of the castable and simultaneously has the waterproof effect; meanwhile, the addition of the corrosion-resistant latex can effectively improve the overall strength and stability of the castable and achieve the purpose of improving the performance of the castable.

Inventors

• WANG XIAOJIE
• ZHANG CHENG
• FAN XIAOKANG
• LI HAO

Assignees

• 宜兴市兴贝耐火保温工程有限公司

Dates

Publication Date

20260505

Application Date

20240509

Claims (4)

1. 1. The castable for preventing the incinerator inner wall from being corroded by incineration waste gas is characterized by comprising, by weight, 65-75 parts of composite aggregate, 8-10 parts of corrosion-resistant latex, 1-2 parts of binder, 3-5 parts of aluminum paste, 1-3 parts of expanded perlite and 2-3 parts of glass fiber; The preparation method of the corrosion-resistant latex comprises the steps of uniformly mixing polyvinyl alcohol, an emulsifying agent and a stabilizing agent according to a mass ratio of 3-5:1-2:0.5-0.7 to obtain a premix, adding water accounting for 85-95 wt.% of the premix, and stirring for 3-8 hours at a speed of 100-200 r/min to obtain an emulsion; Then adding a mixture of butyl rubber and acrylic paint at a rate of 15-30 g/min according to a weight ratio of 1-3:2.3-2.5, wherein the volume ratio of the mixture to the emulsion is 0.5-0.7:1, and continuing stirring to obtain latex; Then adding a defoaming agent into the latex for multiple times, wherein the initial addition amount of the defoaming agent is 7-9 g/L, defoaming treatment is carried out at the initial temperature of 90-95 ℃ for 10-15 min, and the addition amount of the defoaming agent is increased by 5-7% compared with the addition amount of the previous defoaming agent according to the temperature of 60-70% of the previous temperature each time, and the treatment time each time is kept unchanged until the temperature is reduced to 25-30 ℃ to obtain the corrosion resistant latex; Wherein the content of active aluminum in the aluminum powder paste is more than or equal to 89%; the preparation method of the composite aggregate comprises the following steps: (1) Preparing raw materials according to the weight ratio of the recycled aggregate to the natural aggregate to the talcum powder of 8-12:3-5:1-1.5; (2) Ball milling treatment is carried out on the crushed recycled aggregate for 30-40 min to obtain spherical aggregate with the particle size of 10-30 mm, the dilute acid solution is added according to the mass concentration of the spherical aggregate of 10-15 g/3-5 ml, the surface of the spherical aggregate is corroded until holes are generated on the surface, the corrosion time is 2-5 min, then glass beads are sprayed into the holes on the surface of the corroded spherical aggregate by using a shot blasting machine until the surface roughness of the spherical aggregate reaches Ra0.1-0.3, and spraying is completed to obtain the pretreated recycled aggregate; (3) Mixing 1/2-3/4 talcum powder and all pretreated recycled aggregate, performing heat treatment at the temperature of 400-450 ℃ for 25-35 min to obtain a mixed material A, uniformly mixing all natural aggregate and the rest talcum powder at room temperature, performing coarse grinding and screening, performing electromagnetic treatment for 3-5 min at the magnetic field strength of 500-600 Gs, performing fine grinding and secondary screening to obtain a mixed material B with the granularity of 8-10 mm, adding the mixed material A into the mixed material B, adjusting the magnetic field strength to 800-900 Gs, and performing electromagnetic treatment for 5-7 min to obtain the composite aggregate; wherein the recycled aggregate is a mixture of any two or more than two of slag, broken stone, waste ceramic, steel slag and building solid waste in any proportion, and the particle size of the glass beads is 2-5 mm; After defoaming treatment of the latex, carrying out electron irradiation treatment on the fermented bean curd resisting glue at normal temperature and normal pressure, wherein the irradiation mode adopts back and forth scanning type, and the irradiation dose is 30-40 kGy; The preparation method of the castable comprises the following steps: S1, aggregate premixing Mixing and stirring the composite aggregate and the expanded perlite for 10-15 min at the temperature of 3-5 ℃ and the humidity of 55-65 RH%, obtaining a premix, heating to 8-12 ℃ and adding 10-20% of binder, and stirring and uniformly mixing to obtain a mixture M; S2, premixing powder Mixing and stirring the corrosion-resistant latex, the aluminum powder paste and the rest of the binder for 3-5 minutes at the temperature of 30-35 ℃ and the humidity of 25-35 RH%, so as to obtain a mixture N; S3, casting and molding Adding water accounting for 2-4% of the mass of the mixed material M, stirring for 8-10 min, adding the mixed material N, continuously stirring for 15-20 min to obtain mixed aggregate, finally adding water accounting for 8-10% of the mass of the mixed aggregate and glass fibers in the whole amount, continuously stirring for 23-27 min to obtain a wet mixed material, and performing molding treatment on the wet mixed material to obtain a pre-casting material; The molding treatment comprises the steps of carrying out layered compaction on the castable by using a vibrating rod, wherein the thickness of each layer is 250-300 mm, the vibration interval is 240-260 mm, the vibration frequency is 50-80 Hz, and the molded castable is placed into a press machine after the treatment is finished and is subjected to microwave irradiation treatment synchronously, wherein the pressure of the press machine is 0.2-0.3 MPa, the treatment time is 10-15 min, and the power of microwave irradiation is 10-15 kw; s4, post-treatment Curing the pre-cast material obtained in the step S3 for 7-15 d, and then drying at the temperature of 70-80 ℃ for 30-60 min to obtain the cast material; The shot blasting method of the shot blasting machine comprises the steps of carrying out surface cleaning treatment on corroded spherical aggregate, adding a treating agent into the glass beads according to the proportion of the glass beads to the treating agent of 30-50 g:80-100 mL, stirring and uniformly mixing to obtain a compound, attaching the compound on the surface of the spherical aggregate by using the shot blasting machine to finish shot blasting treatment, and mixing the treating agent with 8-12:15-20 of disteardimethyl ammonium hectorite and a solvent according to the volume ratio, wherein the shot blasting angle is 80-90 ℃, and the shot blasting time is 90-270 s.
2. 2. A castable for preventing the corrosion of the inner wall of an incinerator by incineration waste gas according to claim 1, wherein the solvent is one of water, ethanol, dimethyl sulfoxide and N-methyl pyrrolidone.
3. 3. The castable for preventing the incineration waste gas from corroding the inner wall of the incinerator according to claim 1, wherein the defoaming agent comprises, by mass, 8-12 parts of cationic guar gum, 4-6 parts of sodium silicate defoaming powder, 2-4 parts of epoxy resin and 1-3 parts of glycerin.
4. 4. A castable for preventing the corrosion of the inner wall of an incinerator by incineration exhaust gas according to claim 1, characterised in that the binder is monoaluminum phosphate or portland cement.

Description

Castable for preventing incineration waste gas from corroding inner wall of incinerator and preparation method thereof Technical Field The invention relates to the technical field of refractory materials, in particular to a castable for preventing incineration waste gas from corroding the inner wall of an incinerator and a preparation method thereof. Background The castable refers to refractory materials for preparing various cement kilns and inner liners of incineration kilns, and a large amount of acid, alkaline and salt fog waste gas can be generated in the incineration process, so that the castable for the inner wall of the conventional incinerator has limited corrosion resistance effect in daily use, and the metal cylinder of the inner wall of the incinerator can be corroded by the incineration waste gas, so that the service life of the rotary kiln is greatly shortened. The castable mainly comprises stone, metal or nonmetal compound materials and a binding agent, and the existing preparation method is mainly only mixing by stirring. Therefore, in the existing anti-corrosion castable and the preparation method thereof, the acid-resistant castable is prepared from water glass and acid-resistant cement, the main compound is silicic acid, and the water glass has better fire resistance and corrosion resistance, but is not alkali-resistant. The curing process is to dehydrate the silicon dioxide, so that the casting body becomes crisp and the corrosion resistance is invalid once the casting body is in a humid environment. In view of the above, there is an urgent need in the market to develop a novel anti-corrosion castable and a preparation method thereof, so as to improve the corrosion resistance and the comprehensive performance thereof, reduce the preparation cost and reduce the environmental pollution. Disclosure of Invention In order to solve the problems, the invention provides a castable for preventing the inner wall of an incinerator from being corroded by incineration waste gas and a preparation method thereof. The castable for preventing the incinerator inner wall from being corroded by incineration waste gas comprises, by weight, 65-75 parts of composite aggregate, 8-10 parts of corrosion-resistant latex, 1-2 parts of binder, 3-5 parts of aluminum paste, 1-3 parts of expanded perlite and 2-3 parts of glass fiber; The preparation method of the corrosion-resistant latex comprises the steps of uniformly mixing polyvinyl alcohol, an emulsifying agent and a stabilizing agent according to a mass ratio of 3-5:1-2:0.5-0.7 to obtain a premix, adding water accounting for 85-95 wt.% of the premix, and stirring for 3-8 hours at a speed of 100-200 r/min to obtain an emulsion; Then adding a mixture of butyl rubber and acrylic paint at a rate of 15-30 g/min according to a weight ratio of 1-3:2.3-2.5, wherein the volume ratio of the mixture to the emulsion is 0.5-0.7:1, and continuing stirring to obtain latex; Then adding a defoaming agent into the latex for multiple times, wherein the initial addition amount of the defoaming agent is 7-9 g/L, defoaming treatment is carried out at the initial temperature of 90-95 ℃ for 10-15 min, and the addition amount of the defoaming agent is increased by 5-7% compared with the addition amount of the previous defoaming agent according to the temperature of 60-70% of the previous temperature each time, and the treatment time each time is kept unchanged until the temperature is reduced to 25-30 ℃ to obtain the corrosion resistant latex; Wherein the content of active aluminum in the aluminum powder paste is more than or equal to 89%; The corrosion-resistant latex with the function of remarkably improving the corrosion resistance of the castable is prepared, so that the problems that the acid castable is not alkali-resistant, is easy to become crisp in a wet environment and has invalid corrosion resistance in the prior art are solved, meanwhile, the corrosion-resistant latex has good bonding performance, and can enhance the bonding force between the castable and a base material, thereby improving the overall strength and stability of the castable, effectively reducing the consumption of a binder, reducing the pollution of the binder to the environment, simultaneously, the acrylic coating in the corrosion-resistant latex has strong alkali resistance and strong breathing function, allows water vapor to permeate, and has the characteristic of blocking the water, so that the water is effectively prevented from permeating to the other side of the inner wall of the incinerator, and the performance and the service life of a furnace lining are influenced. Meanwhile, the addition of the acrylic coating can replace the investment of the water reducing agent, does not need to additionally add the water reducing agent, can simplify the preparation process of the anti-corrosion castable, reduces the operation steps and the process control requirements, reduces the pollution to the environment a