CN107445633B - Liquid grouting material for thermal-state repair of cracks on coke oven wall, and preparation method and application method thereof - Google Patents

Liquid grouting material for thermal-state repair of cracks on coke oven wall, and preparation method and application method thereof Download PDF

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CN107445633B
CN107445633B CN201710718036.7A CN201710718036A CN107445633B CN 107445633 B CN107445633 B CN 107445633B CN 201710718036 A CN201710718036 A CN 201710718036A CN 107445633 B CN107445633 B CN 107445633B
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agent
parts
cracks
mullite
grouting material
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CN107445633A (en
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陆王钊
金双玲
金鸣林
唐珊
胡震
张建勇
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Shanghai Institute of Technology
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    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B29/00Other details of coke ovens
    • C10B29/06Preventing or repairing leakages of the brickwork
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
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Abstract

The invention discloses a liquid grouting material for thermal repair of cracks on a coke oven wall and a preparation method thereof, wherein the liquid grouting material comprises 100 parts of water glass, 100-250 parts of solid filler and 9-16 parts of additive by mass, the solid filler comprises 50-70% of mullite, 20-30% of refractory clay and 10-20% of quartz sand by mass, and the additive comprises a dispersing agent, a penetrating agent and a defoaming agent. The liquid grouting material for thermal state repairing of coke oven wall cracks is obtained by adding the additive and the solid filler into the water glass solution in sequence and mixing uniformly, and is a grouting material which is easy to pump, has better cohesiveness with repaired refractory material, wide curable sintering temperature and convenient construction. The raw materials are cheap and easy to obtain, no harm is caused to human bodies, the preparation period is short, and the preparation method is simple, so that the method has the characteristics of low production cost, environment-friendly production process, no pollution, batch production and the like.

Description

Liquid grouting material for thermal-state repair of cracks on coke oven wall, and preparation method and application method thereof
Technical Field
The invention relates to a liquid grouting material for thermal state repairing of cracks on a coke oven wall, a preparation method and a use method thereof, in particular to a heat-resistant high-strength shrinkage-free grouting material used in a high-temperature environment, which can be widely used for filling and repairing cracks on walls of high-temperature facilities such as a coke oven and the like, and belongs to the field of coking in metallurgical coal chemical industry.
Background
The coke oven is subjected to high temperature, mechanical and physical and chemical reactions and the like in long-term use, and the oven body always tends to be gradually aged and damaged. After the operation of opening and closing the furnace door, charging coal and discharging coke, the temperature shock of the heat shock, the mechanical collision, extrusion and friction action and the erosion of some harmful substances in the coal gas are caused, so that all parts of the furnace body are gradually damaged. In addition, the coke oven body is mainly built by refractory materials such as high-heat-conductivity silica bricks, the temperature is 1000-1650 ℃, the special crystal transformation of the silica bricks is irreversible, the high-temperature condition is limited, cold-state repair is not allowed, common plastering and repairing pugs such as fireclay and the like can generate crack contraction during hot-state repair, the strength after repair cannot meet the requirement, the hanging time is short, and further damage to the matrix silica bricks can be seriously caused. Therefore, the hot-repair material should have the following characteristics: after grouting, the hot brick can be firmly bonded with a repaired body into a whole, has certain plasticity, has no damage to a furnace brick, and is prevented from cracking due to huge cooling; when self-sintering is carried out at high temperature, the shrinkage rate and the expansion rate are similar to those of furnace bricks, and the service cycle is long; under long-term operation, it can resist mechanical wear and chemical erosion, and has high refractoriness without burning.
In addition, graphite generated by coal gas pyrolysis in the coking process can be continuously deposited in the pores of the brick, so that a very firm graphite layer adhered to the brick is formed, the surface of the brick is easily adhered when graphite is removed, the brick surface is rough, and the graphite is promoted to grow. The graphite entering the brick joints is easily burnt by air leaking into the carbonization chamber when the pressure control is not good or the coking time is too long, so that the raw gas is burnt at the cracks to cause local high temperature, even the wall bricks of the smelting furnace are burnt, and the cracks are widened. If effective treatment measures are not taken timely, the normal operation of the blast furnace is influenced, the working life of the blast furnace is reduced, and the yield is influenced; but also can cause adverse effects on the surrounding environment and harm the physical health and personal safety of surrounding workers.
In Chinese patents CN 101654354B and CN 101597497B, diethylene glycol ethyl ether acetate and glycerol triacetate are respectively adopted as curing agents, and after the curing agents and water glass, the stone rate of the slurry is low, and a certain proportion of water is remained on the upper part of a stone body; the slurry concretion body is white powder, and the cementing strength of the pure concretion body is nearly zero; after the stone body is solidified, the stone body is shrunk by volatile water, and the water loss shrinkage rate can reach more than 80 percent, so that the effect is poor; the curing agent has strong smell and strong irritation to respiratory tract, and various defects make the curing agent not the first choice of the high-temperature furnace body grouting material.
Chinese patent CN102010212B "a repairing material for a heating furnace and a preparation method thereof" comprises the steps of taking (by weight percentage) 2-20% of sodium silicate and/or sodium metasilicate as a binding agent, 97-80% of corundum, alumina or mullite as a main raw material, and 0.5-8% of silica micropowder, 0.5-8% of alumina micropowder or 0.5-8% of alumina micropowder as a sintering aid, and uniformly mixing the raw materials to prepare the repairing material for the heating furnace. The material is put into a pit to be repaired at the bottom of a normally operating heating furnace by a hopper or a shovel on site, and the repairing material and the refractory material at the bottom of the heating furnace are sintered into a whole after 3 to 4 hours of sintering, so that the material can be normally used; because of poor fluidity and long sintering time, the powder is only suitable for repairing pits on the bottom surface of the heating furnace and cannot be used for bonding and maintaining fine cracks in the coke furnace body.
Therefore, due to the particularity of the coking process and the coke oven body, finding a grouting material which meets the above severe requirements and is suitable for repairing cracks of the coke oven body is urgent, and the grouting material has good fluidity in narrow cracks and good combination degree and high-temperature stability with refractory materials such as high-heat-conductivity silica bricks and the like, which become the key points for researching the grouting material.
Disclosure of Invention
One of the purposes of the invention is to provide a liquid grouting material for thermal repair of cracks on the oven wall of a coke oven, which has good fluidity and permeability within a certain temperature range such as room temperature and the like, and can better fill cracks; the sintered solid block has small thermal expansion coefficient, stable performance, high heat resistance, high strength and high bonding degree with repaired refractory material. The light solid block obtained by sintering the grouting material for 2 hours at 1100 ℃ has certain cementing strength and small smell, and the outflow time meets the GB/T1723-93 regulation ≦ 150 s.
The invention also aims to provide the preparation method of the liquid grouting material for thermal repair of cracks on the wall of the coke oven, which only needs to pay attention to the specific adding sequence of the raw materials and only has the physical processes of mixing, stirring and the like, so the preparation method has the characteristics of simple preparation steps, small workload, safe operation and the like.
The invention also aims to provide a use method of the liquid grouting material for thermal repairing of cracks on the wall of the coke oven.
Technical principle of the invention
The liquid grouting material for thermal state repairing of the cracks of the coke oven wall is injected into the cracks through high-pressure grouting and then self-sintering under the high-temperature action, so that the grouting materials such as water glass, refractory clay and the like become high-strength solid substances of a corundum-mullite system, and can be well combined with the refractory material of the oven wall, thereby realizing the effect of repairing the blocked seams.
Technical scheme of the invention
A liquid grouting material for thermal state repairing of cracks on a coke oven wall comprises the following raw materials in parts by mass:
100 parts of water glass;
100-250 parts of solid filler;
9-16 parts of an additive;
the water glass is sodium water glass or potassium water glass with the modulus interval of 3.1-3.4 and the baume degree Bee = 38;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 50-70% of quartz sand: 20-30%: 10 to 20 percent;
wherein the molecular formula of the mullite is 3Al2O3·2SiO2The refractoriness is 1800 ℃ and the average bulk density is 1.911 g/mL;
the fire clay is soft clay with a molecular formula of Al2O3·2SiO2·2H2O, wherein Al2O3Content (wt.)<45% degree of refractoriness>1580 deg.C, average bulk density of 1.199 g/mL;
the quartz sand is common quartz sand of 20-200 meshes, and the average bulk density is 1.404 g/mL;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 30-40% of defoaming agent: 50-65%: 5 to 10 percent;
the dispersing agent is one or a combination of two of homopolymer or copolymer of acrylic acid and ester and homopolymer or copolymer of methacrylic acid and ester, preferably acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer, and the molecular weight of the copolymer is 18000;
the penetrating agent adopts a high-temperature penetrating agent JFC-M and takes a polyoxyethylene ether compound as a main component;
the defoaming agent is emulsified silicone oil with the surface tension of 20-21 dyn/cm.
The preparation method of the liquid grouting material for thermal state repairing of the cracks on the oven wall of the coke oven comprises the following steps:
(1) preparation of solid filler
Simultaneously adding mullite, refractory clay and quartz sand into a mixer with the rotating speed of 50r/min, and mixing for 10min until the mixture is uniform to obtain a solid filler;
(2) preparation of additives
Simultaneously adding the dispersing agent, the penetrating agent and the defoaming agent into a mixer with the rotating speed of 150r/min, and uniformly mixing for 5min to obtain an additive;
(3) and (3) adding the additive obtained in the step (2) into water glass, controlling the rotating speed to be 200r/min, stirring until the mixture is uniform, then controlling the rotating speed to be 300r/min, stirring while adding the solid filler obtained in the step (1), and continuing stirring until the mixture is uniform after the addition is finished, thus obtaining the liquid grouting material for thermal repair of cracks of the coke oven wall.
The solid filler and the additive are prepared in situ, and when the liquid grouting material for thermally repairing cracks of the coke oven wall is used, the obtained liquid grouting material for thermally repairing cracks of the coke oven wall is poured into cracks of the coke oven wall at the temperature of 800-1200 ℃ and then stands for solidification.
The invention has the advantages of
The liquid grouting material for thermal state repairing of the coke oven wall crack has the outflow time of 22.6-59.5s, so the liquid grouting material has good fluidity and smaller viscosity, can well solve the problem of poor fluidity of slurry in a narrow gap in the technical background, and is used for repairing the oven body crack in the coking industry. In addition, the liquid grouting material for thermal state repairing of cracks of the coke oven wall and the granular refractory bricks are put together and placed at 1100 ℃, and the compressive strength of the solid block obtained after 2 hours of sintering is measured to be 41.5-48.3MPa, thereby showing that the sintered product has good mechanical strength and bonding strength and can meet the normal coke oven working condition.
Furthermore, the liquid grouting material for thermal repair of cracks on the wall of the coke oven is characterized in that the liquid grouting material adopts water glass and solid filler as raw materials, and a three-dimensional structure mainly containing silicon, oxygen, silicon, oxygen and aluminum is finally formed in a system through dehydration condensation processes among silicon hydroxyl groups in the water glass and among silicon hydroxyl groups in mullite and aluminum hydroxyl groups in the solid filler, so that a sintered product has the characteristics of high strength and good high-temperature thermal stability.
Further, when the liquid grouting material for thermal state repair of cracks on the wall of the coke oven is used, the high temperature of the coke oven body enables mullite crystals in the solid filler to grow, and the curing degree of the system is deepened, so that the sintered solid block has good impermeability and high temperature resistance.
Furthermore, after the liquid grouting material for thermal repair of cracks on the oven wall of the coke oven is sintered and cooled within the range of 800-1000 ℃, the volume expansion amount of the obtained solid block-shaped object is less than 5%, so that secondary damage to the oven body is avoided, and the normal use of the coke oven is not influenced.
Furthermore, the liquid grouting material for thermal state repair of cracks on the wall of the coke oven has the characteristics of cheap and easily available raw materials, no harm to human bodies, short preparation period and simple preparation method, so that the liquid grouting material has the characteristics of low production cost, environment-friendly production process, no pollution, batch production and the like.
Furthermore, the liquid grouting material for thermal state repairing of the cracks on the oven wall of the coke oven has short gelling time and wide curable sintering temperature, so that the cracks of the oven body can be effectively repaired and the engineering quality is improved, and the liquid grouting material has important significance for the high-efficiency, low-cost and long-life operation of the coke oven in China.
Detailed Description
The present invention is further illustrated by the following specific examples, which are provided only for illustrating the present invention and not for limiting the scope of the present invention.
In the embodiments of the present invention:
the flow-out time is determined by reference to the national standard GB/T1723-93 for the provisions for measuring the viscosity of fluids and by means of a coat-4 viscometer;
the compressive strength refers to the application technical specification of the cement-based grouting material of the national standard GB/T50448-2008;
the slag resistance is measured on the grouting material by referring to the national standard GB/T8931-2007 about the slag resistance test method of the refractory material.
The specification of the raw materials used in the examples of the invention and the information of the manufacturers are given in the following table:
name of raw materials Specification of Manufacturer of the product
Mullite Molecular formula of 3Al2O3·2SiO2The refractoriness is 1800 ℃ and the average bulk density is 1.911g/mL JINGZHOU HUAXIN MOLAISHI Co.,Ltd.
Fire-resistant clay Molecular formula of Al2O3·2SiO2·2H2O, degree of refractoriness>1580 deg.C, average bulk density of 1.199g/mL Weifang Weiyu industry fire-resistant heat-insulation product Limited
Quartz sand 20 to 200 mesh, and an average bulk density of 1.404g/mL Hebei Shengyi mineral products Co Ltd
Dispersing agent Acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer with molecular weight of about 18000 Jiangsu Hai'an petrochemical plant
Penetrant The high-temperature penetrant JFC-M mainly comprises a polyoxyethylene ether compound Jiangsu Hai'an petrochemical plant
Defoaming agent Emulsified silicone oil with surface tension of 20-21 dyn/cm Middle Federal Fine chemical Co Ltd
Water glass Sodium water glass or potassium water glass, the modulus interval is 3.1-3.4, baume degree Bee =38 Hubeixing Galaxy chemical Co., Ltd
Example 1
A liquid grouting material for thermal state repairing of cracks on a coke oven wall comprises the following raw materials in parts by mass:
100 parts of water glass;
100 parts of solid filler;
9 parts of an additive;
the sodium silicate is sodium silicate with the modulus interval of 3.1-3.4 and the baume degree DEG Bee = 38;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 70% of quartz sand: 20%: 10 percent;
wherein the molecular formula of the mullite is 3Al2O3·2SiO2The refractoriness is 1800 ℃ and the average bulk density is 1.911 g/mL;
the fire clay is soft clay with a molecular formula of Al2O3·2SiO2·2H2O, wherein Al2O3Content (wt.)<45% degree of refractoriness>1580 deg.C, average bulk density of 1.199 g/mL;
the quartz sand is common quartz sand of 20-200 meshes, and the average bulk density is 1.404 g/mL;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 30% of defoaming agent: 65%: 5 percent;
wherein the dispersant is acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer, and the molecular weight is 18000;
the penetrating agent is a high-temperature penetrating agent JFC-M and takes a polyoxyethylene ether compound as a main component;
the defoaming agent is emulsified silicone oil with the surface tension of 20-21 dyn/cm.
The preparation method of the liquid grouting material for thermal repair of cracks on the wall of the coke oven comprises the following steps:
(1) preparation of solid filler
Simultaneously adding mullite, refractory clay and quartz sand into a mixer with the rotating speed of 50r/min, and mixing for 10min until the mixture is uniform to obtain a solid filler;
(2) preparation of additives
Simultaneously adding the dispersing agent, the penetrating agent and the defoaming agent into a mixer with the rotating speed of 150r/min, and uniformly mixing for 5min to obtain an additive;
(3) and (3) adding 9 parts of the additive obtained in the step (2) into 100 parts of water glass by mass, controlling the rotating speed to be 200r/min, stirring uniformly, then controlling the rotating speed to be 300r/min, adding 100 parts of the solid filler obtained in the step (1) while stirring, and continuing stirring after adding until uniformly mixing to obtain the liquid grouting material for thermal repair of cracks on the wall of the coke oven.
The solid filler and the additive are prepared in situ, and when the liquid grouting material for thermally repairing cracks of the coke oven wall is used, the obtained liquid grouting material for thermally repairing cracks of the coke oven wall is poured into cracks of the coke oven wall at the temperature of 800-1200 ℃ and then stands for solidification.
According to the national standard GB/T1723-93, the outflow time of the prepared liquid grouting material for repairing the cracks of the oven wall of the coke oven in a hot state is determined as follows: the outflow time is 22.6s, which meets the requirement of ≦ 150s specified in GB/T1723-93, thereby showing that the liquid grouting material for thermally repairing cracks of the coke oven wall has small viscosity and good flowing property, and can be well injected into narrow cracks and completely filled with the grouting material.
According to the national standard GB/T50448-2008, the prepared liquid grouting material for the thermal state repairing of the cracks of the oven wall of the coke oven and the granular refractory bricks are put together and placed at 1100 ℃, and the compressive strength of the obtained solid block after 2 hours of sintering is measured to be 41.5 MPa. Therefore, the solid block obtained by sintering has good mechanical strength and bonding strength, and the liquid grouting material for thermal repair of cracks on the wall of the coke oven can be well combined with refractory materials such as refractory bricks and the like, can completely adapt to the high-temperature working environment of the coke oven and meet the normal working conditions of the coke oven.
The solid block obtained after sintering was measured and observed according to the national standard GB/T8931-2007, and the main crystal phases thereof were corundum and mullite, thereby showing that the slag resistance is good. The volume expansion amount of the solid block-shaped object obtained after sintering is less than 5 percent, and the normal use of the coke oven can not be influenced and the secondary damage to the oven body can not be generated.
Example 2
A liquid grouting material for thermal state repairing of cracks on a coke oven wall comprises the following raw materials in parts by mass:
100 parts of water glass;
250 parts of solid filler;
16 parts of an additive;
the sodium silicate is sodium silicate with the modulus interval of 3.1-3.4 and the baume degree DEG Bee = 38;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 50% of quartz sand: 30%: 20 percent;
wherein the molecular formula of the mullite is 3Al2O3·2SiO2The refractoriness is 1800 ℃ and the average bulk density is 1.911 g/mL;
the fire clay is soft clay with a molecular formula of Al2O3·2SiO2·2H2O, wherein Al2O3Content (wt.)<45% degree of refractoriness>1580 deg.C, average bulk density of 1.199 g/mL;
the quartz sand is common quartz sand of 20-200 meshes, and the average bulk density is 1.404 g/mL;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: the defoaming agent is 40%: 50%: 10 percent;
wherein the dispersant is acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer, and the molecular weight is 18000;
the penetrating agent is a high-temperature penetrating agent JFC-M and takes a polyoxyethylene ether compound as a main component;
the defoaming agent is emulsified silicone oil with the surface tension of 20-21 dyn/cm.
The preparation method of the liquid grouting material for thermal repair of cracks on the wall of the coke oven comprises the following steps:
(1) preparation of solid filler
Simultaneously adding mullite, refractory clay and quartz sand into a mixer with the rotating speed of 50r/min, and mixing for 10min until the mixture is uniform to obtain a solid filler;
(2) preparation of additives
Simultaneously adding the dispersing agent, the penetrating agent and the defoaming agent into a mixer with the rotating speed of 150r/min, and uniformly mixing for 5min to obtain an additive;
(3) and (3) adding 16 parts of the additive obtained in the step (2) into 100 parts of water glass by mass, controlling the rotating speed to be 200r/min, stirring uniformly, then adding 250 parts of the solid filler obtained in the step (1) while stirring at the rotating speed of 300r/min, and continuing stirring after the solid filler is added until the solid filler is uniformly mixed, thus obtaining the liquid grouting material for thermal repair of cracks of the coke oven wall.
The solid filler and the additive are prepared in situ, and when the liquid grouting material for thermally repairing cracks of the coke oven wall is used, the obtained liquid grouting material for thermally repairing cracks of the coke oven wall is poured into cracks of the coke oven wall at the temperature of 800-1200 ℃ and then stands for solidification.
According to the national standard GB/T1723-93, the outflow time of the prepared liquid grouting material for repairing the cracks of the oven wall of the coke oven in a hot state is determined as follows: the outflow time is 31.3s, which meets the requirement of ≦ 150s specified in GB/T1723-93, thereby showing that the liquid grouting material for thermally repairing cracks of the coke oven wall has small viscosity and good flowing property, and can be well injected into narrow cracks and completely filled with the grouting material.
According to the national standard GB/T50448-2008, the prepared liquid grouting material for the thermal state repairing of the cracks of the oven wall of the coke oven and the granular refractory bricks are put together and placed at 1100 ℃, and the compressive strength of the obtained solid block after 2 hours of sintering is measured to be 41.5 MPa. Therefore, the solid block obtained by sintering has good mechanical strength and bonding strength, and the liquid grouting material for thermal repair of cracks on the wall of the coke oven can be well combined with refractory materials such as refractory bricks and the like, can completely adapt to the high-temperature working environment of the coke oven and meet the normal working conditions of the coke oven.
The solid block obtained after sintering was measured and observed according to the national standard GB/T8931-2007, and the main crystal phases thereof were corundum and mullite, thereby showing that the slag resistance is good. The volume expansion amount of the solid block-shaped object obtained after sintering is less than 5 percent, and the normal use of the coke oven can not be influenced and the secondary damage to the oven body can not be generated.
Example 3
A liquid grouting material for thermal state repairing of cracks on a coke oven wall comprises the following raw materials in parts by mass:
100 parts of water glass;
180 parts of solid filler;
13 parts of an additive;
the sodium silicate is sodium silicate with the modulus interval of 3.1-3.4 and the baume degree DEG Bee = 38;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 60% of quartz sand: 25%: 15 percent;
wherein the molecular formula of the mullite is 3Al2O3·2SiO2The refractoriness is 1800 ℃ and the average bulk density is 1.911 g/mL;
the fire clay is soft clay with a molecular formula of Al2O3·2SiO2·2H2O, wherein Al2O3Content (wt.)<45% degree of refractoriness>1580 deg.C, average bulk density of 1.199 g/mL;
the quartz sand is common quartz sand of 20-200 meshes, and the average bulk density is 1.404 g/mL;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 35% of defoaming agent: 55%: 10 percent;
wherein the dispersant is acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer, and the molecular weight is 18000;
the penetrating agent is a high-temperature penetrating agent JFC-M and takes a polyoxyethylene ether compound as a main component;
the defoaming agent is emulsified silicone oil with the surface tension of 20-21 dyn/cm.
The preparation method of the liquid grouting material for thermal repair of cracks on the wall of the coke oven comprises the following steps:
(1) preparation of solid filler
Simultaneously adding mullite, refractory clay and quartz sand into a mixer with the rotating speed of 50r/min, and mixing for 10min until the mixture is uniform to obtain a solid filler;
(2) preparation of additives
Simultaneously adding the dispersing agent, the penetrating agent and the defoaming agent into a mixer with the rotating speed of 150r/min, and uniformly mixing for 5min to obtain an additive;
(3) and (3) adding 13 parts of the additive obtained in the step (2) into 100 parts of water glass by mass, controlling the rotating speed to be 200r/min, stirring uniformly, then controlling the rotating speed to be 300r/min, adding 180 parts of the solid filler obtained in the step (1) while stirring, and continuing stirring after adding until mixing uniformly to obtain the liquid grouting material for thermal repair of cracks on the wall of the coke oven.
The solid filler and the additive are prepared in situ, and when the liquid grouting material for thermally repairing cracks of the coke oven wall is used, the obtained liquid grouting material for thermally repairing cracks of the coke oven wall is poured into cracks of the coke oven wall at the temperature of 800-1200 ℃ and then stands for solidification.
According to the national standard GB/T1723-93, the outflow time of the prepared liquid grouting material for repairing the cracks of the oven wall of the coke oven in a hot state is determined as follows: the outflow time is 55.7s, which meets the requirement of ≦ 150s specified in GB/T1723-93, thereby showing that the liquid grouting material for thermally repairing cracks of the coke oven wall has small viscosity and good flowing property, and can be well injected into narrow cracks and completely filled with the grouting material.
According to the national standard GB/T50448-2008, the prepared liquid grouting material for the thermal state repairing of the cracks of the oven wall of the coke oven and the granular refractory bricks are put together and placed at 1100 ℃, and the compressive strength of the obtained solid block after 2 hours of sintering is measured to be 41.5 MPa. Therefore, the solid block obtained by sintering has good mechanical strength and bonding strength, and the liquid grouting material for thermal repair of cracks on the wall of the coke oven can be well combined with refractory materials such as refractory bricks and the like, can completely adapt to the high-temperature working environment of the coke oven and meet the normal working conditions of the coke oven.
The solid block obtained after sintering was measured and observed according to the national standard GB/T8931-2007, and the main crystal phases thereof were corundum and mullite, thereby showing that the slag resistance is good. The volume expansion amount of the solid block-shaped object obtained after sintering is less than 5 percent, and the normal use of the coke oven can not be influenced and the secondary damage to the oven body can not be generated.
In conclusion, the outflow time of the liquid grouting material for thermal repair of the cracks on the oven wall of the coke oven provided by the invention is 22.6-59.5s, so that the liquid grouting material for thermal repair of the cracks on the oven wall of the coke oven provided by the invention has good fluidity and lower viscosity, can well solve the problem of poor fluidity of slurry in narrow cracks in the technical background, and can be used for repairing the cracks on the oven body in the coking industry. In addition, the liquid grouting material for thermal state repairing of the cracks of the coke oven wall and the granular refractory bricks are put together and placed at 1100 ℃, and the compressive strength of the solid block obtained after 2 hours of sintering is measured to be 41.5-48.3MPa, thereby showing that the solid block obtained after sintering the liquid grouting material for thermal state repairing of the cracks of the coke oven wall and the refractory bricks has good mechanical strength and bonding strength, so that the normal coke oven working conditions can be met, and the industrial production is not influenced.
The foregoing is merely an example of the embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A liquid grouting material for thermal state repairing of cracks on a coke oven wall is characterized by comprising the following raw materials in parts by mass:
100 parts of water glass;
100-250 parts of solid filler;
9-16 parts of an additive;
the water glass is sodium water glass or potassium water glass with the modulus interval of 3.1-3.4 and the baume degree Bee = 38;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 50-70% of quartz sand: 20-30%: 10 to 20 percent;
wherein the molecular formula of the mullite is 3Al2O3·2SiO2The refractoriness is 1800 ℃ and the average bulk density is 1.911 g/mL;
the fire clay is soft clay with a molecular formula of Al2O3·2Si O2·2H2O, wherein Al2O3Content (wt.)<45% degree of refractoriness>1580 deg.C, average bulk density of 1.199 g/mL;
the quartz sand is common quartz sand of 20-200 meshes, and the average bulk density is 1.404 g/mL;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 30-40% of defoaming agent: 50-65%: 5 to 10 percent;
wherein the dispersant is one or the combination of two of homopolymer or copolymer of acrylic acid and ester and homopolymer or copolymer of methacrylic acid and ester;
the penetrating agent is a high-temperature penetrating agent JFC-M and takes a polyoxyethylene ether compound as a main component;
the defoaming agent is emulsified silicone oil with the surface tension of 20-21 dyn/cm.
2. The liquid grouting material for the thermal repair of cracks on the wall of the coke oven as claimed in claim 1, wherein:
the sodium silicate is sodium silicate with the modulus interval of 3.1-3.4 and the baume degree DEG Bee = 38;
the dispersing agent is acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer.
3. The liquid grouting material for hot repair of cracks in coke oven walls as claimed in claim 2, wherein the acrylic acid-sodium styrene sulfonate-hydroxyethyl methacrylate copolymer has a molecular weight of 18000.
4. The liquid grouting material for the thermal repair of cracks on the wall of the coke oven as claimed in claim 3, which comprises the following raw materials in parts by mass:
100 parts of water glass;
100 portions and 180 portions of solid filler;
9-13 parts of an additive;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 60-70% of quartz sand: 20-25%: 10 to 15 percent;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 30-35% of defoaming agent: 55-65%: 5 to 10 percent.
5. The liquid grouting material for the thermal repair of cracks on the wall of the coke oven as claimed in claim 4, which comprises the following raw materials in parts by mass:
100 parts of water glass;
100 parts of solid filler;
9 parts of an additive;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 70% of quartz sand: 20%: 10 percent;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 30% of defoaming agent: 65%: 5 percent.
6. The liquid grouting material for the thermal repair of cracks on the wall of the coke oven as claimed in claim 4, which comprises the following raw materials in parts by mass:
100 parts of water glass;
180 parts of solid filler;
13 parts of an additive;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 60% of quartz sand: 25%: 15 percent;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 35% of defoaming agent: 55%: 10 percent.
7. The liquid grouting material for the thermal repair of cracks on the wall of the coke oven as claimed in claim 3, which comprises the following raw materials in parts by mass:
100 parts of water glass;
180 portions of solid filler and 250 portions of organic solvent;
13-16 parts of an additive;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 50-60% of quartz sand: 25-30%: 15 to 20 percent;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: 35-40% of defoaming agent: 50-55%: 10 percent.
8. The liquid grouting material for the thermal repair of cracks on the wall of the coke oven as claimed in claim 7, wherein the liquid grouting material comprises the following raw materials in parts by mass:
100 parts of water glass;
250 parts of solid filler;
16 parts of an additive;
the solid filler is a mixture consisting of mullite, chamotte and quartz sand, the dosage of the mullite, the chamotte and the quartz sand in the mixture is calculated according to the mass percentage, and the content of the mullite is as follows: refractory clay: 50% of quartz sand: 30%: 20 percent;
the additive is a mixture consisting of a dispersing agent, a penetrating agent and a defoaming agent, the dosage of the dispersing agent, the penetrating agent and the defoaming agent in the mixture is calculated according to the mass percentage, and the dispersing agent is as follows: penetrant: the defoaming agent is 40%: 50%: 10 percent.
9. The method for preparing the liquid grouting material for the thermal state repairing of the cracks on the oven wall of the coke oven according to any one of claims 1 to 8, which comprises the following steps:
(1) preparation of solid filler
Simultaneously adding mullite, refractory clay and quartz sand into a mixer with the rotating speed of 50r/min, and mixing for 10min until the mixture is uniform to obtain a solid filler;
(2) preparation of additives
Simultaneously adding the dispersing agent, the penetrating agent and the defoaming agent into a mixer with the rotating speed of 150r/min, and uniformly mixing for 5min to obtain an additive;
(3) and (3) adding the additive obtained in the step (2) into water glass, controlling the rotating speed to be 200r/min, stirring until the mixture is uniform, then controlling the rotating speed to be 300r/min, stirring while adding the solid filler obtained in the step (1), and continuing stirring until the mixture is uniform after the addition is finished, thus obtaining the liquid grouting material for thermal repair of cracks of the coke oven wall.
10. The use method of the liquid grouting material for the thermal repair of the cracks on the oven wall of the coke oven as claimed in any one of claims 1 to 8, characterized in that the solid filler and the additive are prepared at the same time, when in use, the additive is added into water glass, the rotating speed is controlled to be 200r/min, the stirring is carried out until the mixture is uniform, then the solid filler is added while the rotating speed is controlled to be 300r/min, the stirring is continued until the mixture is uniform after the addition, and then the obtained liquid grouting material for the thermal repair of the cracks on the oven wall of the coke oven is poured into the cracks on the oven wall of the coke oven with the temperature of 800-1200 ℃ and stands for solidification.
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