CN114163228B - Slag-stopping sliding plate of aluminum-calcium-carbon converter and preparation method thereof - Google Patents
Slag-stopping sliding plate of aluminum-calcium-carbon converter and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a slag-stopping sliding plate of an aluminum-calcium-carbon converter and a preparation method thereof, belonging to the field of refractory materials. The aluminum-calcium-carbon converter slag stopping sliding plate comprises the following components in percentage by weight: 14 to 30 percent of tabular corundum, 34 to 55 percent of calcium hexaluminate sand, 4 to 5 percent of silicon carbide and 27 to 33 percent of co-ground powder, wherein the total percentage is 100 percent; 3.5 to 5.5 percent of phenolic resin bonding agent is added. According to the invention, calcium hexaluminate sand subjected to acid leaching treatment is introduced as particle aggregate, and the polymerized alumina is coated on the surface of the calcium hexaluminate sand particles to fill pores on the surface of the calcium hexaluminate sand particles, so that the compressive strength of the calcium hexaluminate sand particles is improved, and the reaction of the calcium hexaluminate sand particles and alkaline substances is blocked; solid solution with larger expansion coefficient is avoided being formed with transition metal in the steel slag, so that the sliding plate has good erosion resistance, wear resistance and high temperature resistance.
Description
Technical Field
The invention belongs to the technology of refractory materials, and particularly relates to a slag stopping sliding plate of an aluminum-calcium-carbon converter and a preparation method thereof.
Background
With the rapid development of the steel industry, the requirements of users on the quality of steel are increasingly improved, and the production of high-quality high-technology-content high-added-value high-quality steel products becomes the inevitable choice of steel enterprises. The quality of the molten steel directly influences the performance of steel, so that the reduction of the slag discharge in the converter tapping process is an important link for improving the quality of the molten steel. How to reduce the slag discharge in the converter tapping process is a technical problem which puzzles the steel industry for a long time and becomes a restriction factor for smelting special steel and high-quality steel by the converter. The sliding plate slag blocking device is arranged on the converter and matched with the slag discharging detection technology, so that the steel slag can be timely controlled in the steel discharging process, the slag discharging amount is reduced, and the cleanliness of molten steel is improved.
The material that converter pushing off the slag slide adopted in the existing market is mostly aluminium carbon, aluminium zirconium carbon material and inlay the compound material slide of zirconium material, though can satisfy the field operation requirement, but under powerful pressure of molten steel tapping in-process and impact force effect, it is too fast to go up slide cast hole reaming can appear, fall the piece, the erosion is serious, down slide non-slip region skinning, the phenomenon of napping, cause great potential safety hazard to whole converter slag blocking system, be unfavorable for high life and fast rhythm requirement in the in-service use, in addition, it is higher to inlay zirconium slide cost, the time limit for a project is longer, receive zirconium itself and the unstable factor of assembling process easily, lead to product quality stability to descend.
Through retrieval, the patent publication number is CN107500747A, the publication date is 2017, 12 and 22, the invention discloses a compact calcium hexaluminate castable, which comprises the following raw materials in percentage by weight: 15-45% of calcium hexaluminate raw material with the particle size of 3-5 mm, 10-30% of calcium hexaluminate raw material with the particle size of 1-3 mm, 0-20% of calcium hexaluminate raw material with the particle size of 0.088-1 mm, 0-20% of corundum raw material with the particle size of 0.088-1 mm, 0-30% of calcium hexaluminate raw material with the particle size of less than 88 mu m, 0-30% of sintered corundum powder with the particle size of less than 88 mu m, and alpha-Al 2 O 3 0-10% of micro powder, 5-15% of pure aluminate cement and 0-20% of spinel. The pouring material of the invention is prepared by CA 6 Structural change on contact with slag to form dense CA 2 the/CA structure layer inhibits the further penetration and erosion of slag, and simultaneously utilizes CA 6 C formed during deep reaction with slag 12 A 7 And the like, capturing inclusions in the steel and purifying the quality of the molten steel.
The patent publication number is CN102718514A, the publication date is 10 months and 10 days in 2012, and the invention discloses a microporous high-strength corundum-calcium hexaluminate composite refractory raw material and a preparation method thereof, wherein 94-98 wt% of alumina fine powder or aluminum hydroxide fine powder is used as an aluminum source, 1-6 wt% of calcium carbonate fine powder or calcium hydroxide fine powder is used as a calcium source, water accounting for 30-60 wt% of the total amount of the raw materials is added, the raw materials are mixed, wet grinding is carried out on a ball mill for 0.5-2 hours, the temperature is kept for 12-48 hours at the temperature of 110-200 ℃ after wet grinding slurry is solidified, then the temperature is kept for 3-5 hours at the temperature of 1750-1900 ℃, and a product after sintering is crushed, so that the microporous high-strength corundum-calcium hexaluminate composite refractory raw material is obtained. The method adopts a wet grinding process to fully mix a calcium source and an aluminum source, so that calcium hexaluminate generated by the aluminum source and the calcium source through chemical reaction is uniformly dispersed in corundum, and a microporous high-strength corundum-calcium hexaluminate composite refractory raw material is obtained by utilizing the characteristics of a microporous flaky structure of the calcium hexaluminate and the matching property of the microporous flaky structure of the calcium hexaluminate and the thermal expansion coefficient of the corundum.
The above patents all disclose further research on refractory materials, and particularly disclose some attempts to use calcium hexaluminate, but the application of calcium hexaluminate in skis for slag skimming in alumino-calcium-carbon converters has not been found to be useful.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing aluminum calcium carbon converter slag-stopping sliding plate has poor high temperature resistance and slag resistance, the invention provides the aluminum calcium carbon converter slag-stopping sliding plate added with compact calcium hexaaluminate, so that the sliding plate has good high temperature resistance, slag resistance and high temperature volume stability, and the service life is prolonged.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the aluminum-calcium-carbon converter slag-stopping sliding plate is obtained by adding an organic binder into the converter slag-stopping sliding plate accounting for 100 wt% of the total weight, mixing the obtained mixture, forming, and then firing in an oxidizing atmosphere, wherein the converter slag-stopping sliding plate comprises the following components in percentage by weight: 14 to 30 percent of plate-shaped corundum, 34 to 55 percent of calcium hexaluminate sand, 4 to 5 percent of silicon carbide and 27 to 33 percent of co-ground powder, wherein the total percentage is 100 percent.
It has surprisingly been found that when the calcium hexaluminate (CA) is used 6 ) And (2) carrying out 0.5-1.0 wt% inorganic acid (such as hydrochloric acid, sulfuric acid, acetic acid and the like) liquid soaking treatment on the sand for 5-10 minutes, and drying in the shade for 2-4 hours after soaking is finished, wherein the finally obtained aluminum-calcium-carbon converter slag-blocking sliding plate has enough anti-corrosion capability and excellent anti-alkaline slag corrosion performance in an alkaline environment, and the service life and the quality stability of the sliding plate are improved.
Through a large number of experiments and analyses, the inventors probably have the following reasons: the current theoretical research shows that the solid-phase reaction sintering method is adopted to prepare CA 6 By modulating calcium source (CaCO) 3 And CaO) capable of modulating CA 6 Shape ofAppearance and structure. When CaO is selected as a calcium source, the higher activity of CaO accelerates CA and Al 2 O 3 The reaction rate of (2) contributes to CA 6 Forming equiaxed crystals which cannot be used as toughening phases to be inserted in the middle of the corundum phase; when CaCO is selected 3 When used as a calcium source, CA 6 CA obtained by wetting the surface of the grains and dissolving the precipitates 6 Has a flaky crystal structure, but is caused by CaCO in the sintering process 3 And Al 2 O 3 With different contact areas (CaCO) 3 And Al 2 O 3 A certain level difference exists in particle size), the contact area of raw materials is small, a sheet structure is formed, and the synthesized CA is 6 The porosity is high. Therefore, the invention carries out acid leaching treatment on the proportioned calcium hexaluminate sand particles, and the generated polymeric alumina is wrapped on the surfaces of the calcium hexaluminate sand particles so as to fill pores on the surfaces of the calcium hexaluminate sand particles, thereby improving the compressive strength of the calcium hexaluminate sand particles on one hand and obstructing the reaction of the calcium hexaluminate sand particles (amphoteric substances) and alkaline substances on the other hand. In addition, the aluminum-calcium-carbon converter slag stopping sliding plate is applied to the process of molten steel tapping, and under the high-temperature alkaline environment, the surface of calcium hexaluminate sand particles is wrapped, so that the possibility that impurity ions, particularly iron ions and manganese ions in steel slag, enter into cation vacancies is prevented, and CA (calcium aluminum) is enabled to 6 Solid solution with larger expansion coefficient can not be formed with transition metal and the like, thereby effectively reducing the cracking probability of the slag stopping sliding plate and improving the safe service life.
Preferably, a phenolic resin binder accounting for 3.5 to 5.5 percent of the total weight is additionally added.
Preferably, the co-milled powder is composed of 10% -18% of calcium hexaluminate fine powder and 6% -12% of alpha-Al 2 O 3 The composite material is prepared by uniformly mixing micro powder, 2-3% of metal aluminum powder, 1-2% of boron carbide fine powder, 1-4% of carbon black and 1-2% of metal silicon powder.
Preferably, the calcium hexaluminate has a bulk density of 3.38g/cm 3 The melting point was 1875 ℃.
Preferably, the particle size of the calcium hexaluminate sand is (3-1, 1-0) mm, and the weight percentage of each particle size is as follows: particle size of 3 &20-30% of 1mm calcium hexaluminate sand and 14-25% of 1-0 mm calcium hexaluminate sand with particle size; the calcium hexaluminate sand comprises the following chemical components in percentage by weight: al (aluminum) 2 O 3 90% of (C), 8.5% of CaO, Fe 2 O 3 0.74% of (B), SiO 2 The content of (2) is 0.9%.
Preferably, the particle size of the calcium hexaluminate fine powder is 0-0.075 mm, and the weight percentage is 10% -18%; the calcium hexaluminate fine powder comprises the following chemical components in percentage by weight: al (Al) 2 O 3 90% of (C), 8.5% of CaO, Fe 2 O 3 0.74% of (B), SiO 2 The content of (2) is 0.9%.
Preferably, the plate-shaped corundum has a particle size of (2-1, 1-0.5, 0.5-0) mm, and the weight percentage of each particle size is as follows: 5-10% of plate-shaped corundum with the particle size of 2-1 mm, 4-8% of plate-shaped corundum with the particle size of 1-0.5 mm and 5-12% of plate-shaped corundum with the particle size of 0.5-0 mm; the plate-shaped corundum comprises the following chemical components in percentage by weight: al (Al) 2 O 3 The content of (A) is 99.07%, Na 2 O content of 0.31%, CaO content of 0.08%, Fe 2 O 3 0.06% of (A), 0.18% of MgO, and SiO 2 The content of (B) is 0.1%.
Preferably, the particle size of the silicon carbide is 1-0 mm, and the weight percentage is 4% -5%; in the silicon carbide: SiC content 97.5%, Fe 2 O 3 0.35% of (B), SiO 2 0.56%, free carbon 0.4%, free silicon 0.5%.
Preferably, the alpha-Al 2 O 3 The particle size of the micro powder is 0-2 μm, and the weight percentage is 6% -12%; the alpha-Al 2 O 3 In the micro powder: al (Al) 2 O 3 The content of (A) is more than or equal to 99.0 percent, and SiO 2 Content of (B) is less than or equal to 0.1%, Fe 2 O 3 The content of the sodium-containing complex is less than or equal to 0.08 percent, and Na 2 O+K 2 The content of O is less than or equal to 0.3 percent.
Preferably, the particle size of the metal aluminum powder is 0-0.075 mm; among the metal aluminum powder: the content of Al is more than or equal to 99 percent, the content of Fe is less than or equal to 0.2 percent, the content of Si is less than or equal to 0.2 percent, and the content of Cu is less than or equal to 0.1 percent.
Preferably, in the carbon black: the fixed carbon content is more than or equal to 99 percent, the volatile content is less than or equal to 0.5 percent, the ash content is less than or equal to 0.5 percent, and the water content is less than or equal to 0.5 percent.
Preferably, the boron carbide particle size is 325 mesh.
Preferably, among the metal silicon powder: the content of Si is 98.6%, the content of Fe is 0.54%, the content of Al is 0.49%, and the content of Ca is 0.36%; the particle size of the metal silicon powder is 325 meshes.
The invention also aims to provide a preparation method of the slag stopping sliding plate of the aluminum-calcium-carbon converter, which comprises the following steps:
step one, preparing co-milled powder: mixing the calcium hexaluminate sand fine powder and alpha-Al according to the weight percentage 2 O 3 Uniformly mixing the micro powder, the metal aluminum powder, the carbon black, the boron carbide fine powder and the metal silicon powder to prepare co-milled powder;
step two, proportioning the granular materials: uniformly mixing plate-shaped corundum with the particle size of 2-1 mm, plate-shaped corundum with the particle size of 1-0.5 mm, plate-shaped corundum with the particle size of 0.5-0 mm, calcium hexaluminate sand with the particle size of 3-1 mm and silicon carbide with the particle size of 1-0 mm to obtain granular aggregate;
step three, mixing materials: dry-mixing the granular aggregate for 3-5 minutes by using a wet mill, then slowly adding a phenolic resin binding agent, finally adding the co-milled powder, and mixing for 35-40 minutes to obtain a mixture;
step four, forming: pressing and molding the mixture on a 1500t electric spiral brick press to obtain a green brick;
step five, drying: naturally airing the green body for 8 hours, placing the green body in a tunnel natural gas drying kiln, drying according to a set curve, wherein the initial temperature of the green body in the kiln is 30 ℃, the temperature is increased from 30 ℃ to 80 ℃ within 4 hours, the temperature is increased from 80 ℃ to 120 ℃ within 1 hour → 4 hours, the temperature is increased from 120 ℃ to 150 ℃ within 1 hour → 3 hours, the temperature is increased from 150 ℃ to 180 ℃ within 1 hour → 3 hours, the temperature is increased from 180 ℃ to 210 ℃ within 1 hour → 3 hours, and the temperature is maintained for 16 hours; the total drying time was 37 hours; inspecting the product after the product is taken out of the kiln, and selecting the product with qualified size and appearance to enter the next procedure;
step six, firing: and (3) putting the dried qualified product into a kiln, laterally arranging the green bricks in a built sagger, sealing the sagger by using a stainless steel cover, putting the green bricks into a kiln car, and firing the green bricks in a medium-temperature tunnel kiln, wherein the firing atmosphere is an oxidation atmosphere, the firing maximum temperature is 600 ℃, and the firing specific process curve is as follows: room temperature is 200 ℃ (9 hours) → 200-300 ℃ (12 hours) → 300-400 ℃ (12 hours) → 400-600 ℃ (10 hours) → 600 ℃ (15 hours), the total time of firing is 58 hours → fire stopping, the kiln airing → the temperature of the kiln is reduced to 300 ℃, the door handle is loosened → the temperature of the kiln is reduced to 200 ℃, the door is opened for natural cooling, the temperature in the kiln is cooled to 100 ℃ and then the kiln car is taken out, the kiln is taken out and put lightly, the qualified product after firing and inspection can enter the next process, namely, the temperature is increased from 200 ℃ to 200 ℃ within 9 hours to 300 ℃ within 12 hours from 300 ℃ to 400 ℃ within 10 hours from 400 ℃ to 600 ℃ within 15 hours from 300 ℃ within 10 hours from 300 ℃ to 600 ℃ within 9 hours, and the total time is 58 hours;
the oxidizing atmosphere is an oxygen atmosphere or an air atmosphere;
step seven, hooping: polishing and flattening the welding line of the iron hoop, wherein the hoop polishing position is positioned in the middle of the sliding plate, the welding line of the iron hoop cannot exceed 1mm, and the gap between the iron hoop and the semi-finished sliding plate cannot exceed 1 mm;
step eight, grinding: grinding on a numerical control vertical shaft circular table surface grinder, controlling the lower cutter amount to be 2mm/min and controlling the multiplying power to be 60-80%; the flatness of the working surface of the sliding plate is less than or equal to 0.05mm after grinding, and the parallelism is less than or equal to 0.5 mm; after grinding, the mixture is dried immediately in a continuous infrared drying kiln at the drying temperature of 220 ℃, and the mixture can enter the working procedures of coating, veneering and packaging after being checked to be qualified;
step nine, coating: coating a layer of anti-oxidation coating on the dried working surface of the sliding plate, wherein the coating is uniform and smooth;
step ten, veneering: after coating, a layer of asbestos pad is stuck on the non-working surface, and the adhesive is all-purpose adhesive or white latex;
step eleven, packaging: naturally airing the veneered brick body for 24 hours, boxing the brick body after the temperature of the brick body is reduced to room temperature, enlarging a plastic bag at the bottom of the box, placing a drying agent in the box, placing a layer of drying agent after each layer is packed, and binding the large plastic bag with a binding rope after the packing is finished.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the calcium hexaluminate sand obtained by soaking treatment with an inorganic acid solution is introduced, and the polymeric alumina is wrapped on the surface of the calcium hexaluminate sand granules and fills pores on the surface of the calcium hexaluminate sand granules, so that the compressive strength of the calcium hexaluminate sand granules is improved on one hand, and the reaction of the calcium hexaluminate sand granules and an alkaline substance is blocked on the other hand; meanwhile, a solid solution with a larger expansion coefficient is prevented from being formed with transition metal and the like in the steel slag, the cracking probability of the slag blocking sliding plate is effectively reduced, the safe service life is prolonged, the prepared aluminum-calcium-carbon converter slag blocking sliding plate has enough anti-corrosion capability in an alkaline environment, low solubility in iron oxide-containing slag, low wettability to molten metal and molten slag, excellent anti-alkaline slag corrosion performance, the cast holes and the plate surface of the sliding plate can be well protected, the cast hole corrosion rate and the plate surface galling phenomenon are reduced, and the service life and the quality stability of the sliding plate are improved;
(2) the volume density of the calcium hexaluminate reaches 3.38g/cm 3 The melting point is as high as 1875 ℃, the refractoriness is high, the thermal conductivity is low, the thermal expansion coefficient of calcium hexaluminate is very close to that of corundum, the calcium hexaluminate and corundum can be used together in any proportion, the calcium hexaluminate crystal grain grows in an anisotropic manner to form a flaky or tabular crystal shape, and the calcium hexaluminate crystal grain is taken as a toughening phase to be introduced into tabular corundum and alpha-Al 2 O 3 In an aluminum calcium carbon converter slag-stopping sliding plate system with a micro-powder corundum phase as a main body, the flaky crystal form of the aluminum calcium carbon converter slag-stopping sliding plate system is inserted between corundum phases, so that the mechanical property of the material can be obviously improved, and the product has excellent high-temperature volume stability, wear resistance, high-temperature erosion resistance and scouring resistance;
(3) the calcium hexaluminate and the tabular corundum form a complementary crystal structure, namely alpha-Al 2 O 3 The addition of the micro powder plays a role in increasing the strength and densifying the calcium hexaluminate, and the physical property of the product is obviously improvedPerformance;
(4) compared with the traditional high-temperature aluminum zirconium carbon sintering sliding plate, the intermediate-temperature sintering process has the advantages of low sintering temperature, greatly reduced power and gas consumption, reduced energy consumption and environmental pollution, shortened manufacturing period and low manufacturing cost.
Detailed Description
The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.
The product is prepared by introducing a compact calcium hexaluminate raw material obtained by soaking in an inorganic acid solution, and the calcium hexaluminate has the properties of high refractoriness, low thermal conductivity, excellent alkali resistance and high stability in a reducing atmosphere, and is combined with tabular corundum and alpha-Al 2 O 3 The micro powder is combined to form a converter slag stopping sliding plate with stable performance, and the sliding plate has excellent alkali resistance, wear resistance and high-temperature volume stability under high-temperature scouring.
Example 1
A compact calcium hexaluminate-added slag-stopping sliding plate of an aluminum calcium carbon converter comprises the following components in percentage by weight: 30% of tabular corundum, 34% of calcium hexaluminate sand, 5% of 97 silicon carbide and 31% of co-milled powder, wherein the total percentage is 100%; 3.5 percent of phenolic resin bonding agent is added. Wherein the co-milled powder is composed of 12% calcium hexaaluminate fine powder and 12% alpha-Al 2 O 3 The aluminum-carbon composite material is prepared by uniformly mixing micro powder, 2% of metal aluminum powder, 1% of boron carbide fine powder, 2% of carbon black and 2% of metal silicon powder.
The calcium hexaluminate (CA) is a high-temperature calcined compact synthetic refractory raw material 6 ) And (3) soaking the sand in 0.6 wt% hydrochloric acid solution for 8 minutes, and drying in the shade for 3 hours after soaking.
The plate-shaped corundum has the particle size of (2-1, 1-0.5 and 0.5-0) mm, and the weight percentages of the particle sizes are as follows: plate-shaped particle with particle size of 2-1 mm5 to 10 percent of corundum, 4 to 8 percent of plate-shaped corundum with the grain diameter of 1 to 0.5mm and 5 to 12 percent of plate-shaped corundum with the grain diameter of 0.5 to 0 mm; the plate-shaped corundum comprises the following chemical components in percentage by weight: al (Al) 2 O 3 The content of (A) is 99.07%, Na 2 O content of 0.31%, CaO content of 0.08%, Fe 2 O 3 0.06% of (A), 0.18% of MgO, and SiO 2 The content of (B) is 0.1%.
The particle size of the calcium hexaluminate sand is (3-1, 1-0) mm, and the weight percentages of the particle sizes are as follows: 20-30% of calcium hexaluminate sand with the grain diameter of 3-1 mm and 14-25% of calcium hexaluminate sand with the grain diameter of 1-0 mm; the calcium hexaluminate sand comprises the following chemical components in percentage by weight: al (Al) 2 O 3 90% of (C), 8.5% of CaO, Fe 2 O 3 0.74% of (B), SiO 2 0.9% of (A).
The particle size of the calcium hexaluminate fine powder is 0-0.075 mm, and the weight percentage of the particle size is 10% -18%; the calcium hexaluminate fine powder comprises the following chemical components in percentage by weight: al (Al) 2 O 3 90% of (C), 8.5% of CaO, Fe 2 O 3 0.74% of (B), SiO 2 0.9% of (A).
The particle size of the silicon carbide is 1-0 mm, and the weight percentage of the particle size is 4-5%; in the silicon carbide: SiC content 97.5%, Fe 2 O 3 0.35% of (B), SiO 2 0.56%, free carbon 0.4%, free silicon 0.5%.
The alpha-Al 2 O 3 The particle size of the micro powder is 0-2 μm, and the weight percentage of the particle size is 6% -12%; the alpha-Al 2 O 3 In the micro powder: al (Al) 2 O 3 The content of (A) is more than or equal to 99.0 percent, and SiO 2 Content of (B) is less than or equal to 0.1%, Fe 2 O 3 The content of the sodium-containing complex is less than or equal to 0.08 percent, and Na 2 O+K 2 The content of O is less than or equal to 0.3 percent.
The particle size of the metal aluminum powder is 0-0.075 mm; among the metal aluminum powder: the content of Al is more than or equal to 99 percent, the content of Fe is less than or equal to 0.2 percent, the content of Si is less than or equal to 0.2 percent, and the content of Cu is less than or equal to 0.1 percent.
In the carbon black: the fixed carbon content is more than or equal to 99 percent, the volatile content is less than or equal to 0.5 percent, the ash content is less than or equal to 0.5 percent, and the water content is less than or equal to 0.5 percent.
The granularity of the boron carbide is 325 meshes.
Among the metal silicon powder: the content of Si is 98.6%, the content of Fe is 0.54%, the content of Al is 0.49%, and the content of Ca is 0.36%; the particle size of the metal silicon powder is 325 meshes.
The preparation method of the compact calcium hexaluminate-added slag-stopping sliding plate of the aluminum-calcium-carbon converter comprises the following steps:
step one, preparing co-milled powder: mixing the fine powder of calcium hexaluminate sand and alpha-Al according to weight percentage 2 O 3 Uniformly mixing the micro powder, the metal aluminum powder, the carbon black, the boron carbide fine powder and the metal silicon powder to prepare co-milled powder;
step two, proportioning the granular materials: uniformly mixing plate-shaped corundum with the grain size of 2-1 mm, plate-shaped corundum with the grain size of 1-0.5 mm, plate-shaped corundum with the grain size of 0.5-0 mm, calcium hexaluminate sand with the grain size of 3-1 mm, calcium hexaluminate sand with the grain size of 1-0 mm and silicon carbide with the grain size of 1-0 mm according to weight percentage to obtain a granular ingredient;
step three, mixing materials: dry-mixing the granular aggregate for 3-5 minutes by using a wet mill, then slowly adding a phenolic resin binding agent, finally adding the co-milled powder, and mixing for 35-40 minutes to obtain a mixture;
step four, molding: pressing and molding the mixture on a 1500t electric spiral brick press to obtain a green brick;
step five, drying: naturally airing the green body for 8 hours, placing the green body in a tunnel natural gas drying kiln, drying according to a set curve, wherein the initial temperature of the green body in the kiln is 30 ℃, the temperature is increased from 30 ℃ to 80 ℃ within 4 hours, the temperature is increased from 80 ℃ to 120 ℃ within 1 hour → 4 hours, the temperature is increased from 120 ℃ to 150 ℃ within 1 hour → 3 hours, the temperature is increased from 150 ℃ to 180 ℃ within 1 hour → 3 hours, the temperature is increased from 180 ℃ to 210 ℃ within 1 hour → 3 hours, and the temperature is maintained for 16 hours; the total drying time was 37 hours; inspecting the product after the product is taken out of the kiln, and selecting the product with qualified size and appearance to enter the next procedure;
step six, firing: and (3) putting the dried qualified product into a kiln, laterally arranging the green bricks in a built sagger, sealing the sagger by using a stainless steel cover, putting the green bricks into a kiln car, and firing the green bricks in a medium-temperature tunnel kiln, wherein the firing atmosphere is an oxidation atmosphere, the firing maximum temperature is 600 ℃, and the firing specific process curve is as follows: the method comprises the following steps of (1) keeping the room temperature at-200 ℃, 9 hours → 200-300 ℃, 12 hours → 300-400 ℃, 12 hours → 400-600 ℃, 10 hours → 600 ℃ for heat preservation, 15 hours, 58 hours of total firing time → stopping fire, airing the kiln → lowering the temperature of the kiln to 300 ℃, loosening a handle of a kiln door → lowering the temperature of the kiln to 200 ℃, opening the kiln door for natural cooling → taking out the kiln car after cooling in the kiln to 100 ℃, and lightly taking and lightly putting when taking out the kiln, wherein the qualified product can enter the next process after inspection.
Step seven, hooping: polishing and flattening the welding line of the iron hoop, wherein the hoop polishing position is positioned in the middle of the sliding plate, the welding line of the iron hoop cannot exceed 1mm, and the gap between the iron hoop and the semi-finished sliding plate cannot exceed 1 mm;
step eight, grinding: grinding on a numerical control vertical shaft circular truncated cone surface grinder, controlling the lower cutter amount to be 2mm/min and controlling the multiplying power to be 60-80%; the flatness of the working surface of the sliding plate is less than or equal to 0.05mm after grinding, and the parallelism is less than or equal to 0.5 mm; drying immediately in a continuous infrared drying kiln at 220 ℃ after grinding, and entering the procedures of coating, veneering and packaging after the drying is qualified;
step nine, coating: and coating a layer of anti-oxidation coating on the dried working surface of the sliding plate, wherein the coating is uniform and smooth.
Step ten, veneering: after coating, a layer of asbestos pad is stuck on the non-working surface, and the adhesive is universal adhesive or white latex.
Step eleven, packaging: naturally airing the veneered brick body for 24 hours, boxing the brick body after the temperature of the brick body is reduced to room temperature, enlarging a plastic bag at the bottom of the box, placing a drying agent in the box, placing a layer of drying agent after each layer is packed, and binding the large plastic bag with a binding rope after the packing is finished.
Example 2
In this example, the components and weight percentages of the compact calcium hexaluminate-added sliding plate for pushing off slag in an aluminum-calcium-carbon converter are according to the formula shown in table 1, and the preparation method is the same as that in example 1.
Wherein the calcium hexaluminate (CA) 6 ) And (3) soaking the sand in 0.8 wt% hydrochloric acid solution for 5 minutes, and drying in the shade for 4 hours in the dark after soaking.
Example 3
In this example, the components and weight percentages of the compact calcium hexaluminate-added sliding plate for pushing off slag in an aluminum-calcium-carbon converter are according to the formula shown in table 1, and the preparation method is the same as that in example 1.
Wherein the calcium hexaluminate (CA) 6 ) And (3) soaking the sand in 0.5 wt% sulfuric acid solution for 6 minutes, and drying in the shade for 2 hours in a dark place after soaking.
Example 4
In this example, the components and weight percentages of the compact calcium hexaluminate-added sliding plate for pushing off slag in an aluminum-calcium-carbon converter are according to the formula shown in table 1, and the preparation method is the same as that in example 1.
Wherein the calcium hexaluminate (CA) 6 ) And (3) soaking the sand in 1.0 wt% acetic acid solution for 10 minutes, and drying in the shade for 3 hours after soaking.
TABLE 1 particle types and percentages of the ingredients used in the examples of the present invention
| Name of raw materials | Specification of | Existing products | Example 1 | Example 2 | Example 3 | Example 4 |
| Plate-like corundum | 2-1mm | 25 | 10 | 8 | 6 | 5 |
| Plate-like corundum | 1-0.5mm | 7 | 8 | 6 | 4 | 4 |
| Plate-like corundum | 0.5-0mm | 15 | 12 | 8 | 5 | 5 |
| Zirconium mullite | 1-0.5 | 8 | - | - | - | - |
| Zirconium mullite | 0.5-0 | 7 | - | - | - | - |
| Calcium hexaaluminate sand | 3-1mm | - | 20 | 25 | 28 | 30 |
| Calcium hexaaluminate sand | 1-0mm | - | 14 | 18 | 20 | 25 |
| 97 silicon carbide | 1-0mm | 3 | 5 | 4 | 4 | 4 |
| Fine powder of calcium hexaluminate | 0～0.075mm | - | 12 | 15 | 18 | 10 |
| Tabular corundum fine powder | 0～0.075mm | 12 | - | - | - | - |
| Fine powder of alpha-alumina | 0～2μm | 15 | 12 | 10 | 8 | 6 |
| Metal aluminum powder | 0～0.075mm | - | 2 | 2 | 2 | 3 |
| Carbon black | N330 | 3 | 2 | 1 | 3 | 4 |
| Boron carbide | 325 mesh screen | 2 | 1 | 2 | 1 | 2 |
| 98 metallic silicon | 325 mesh screen | 3 | 2 | 1 | 1 | 2 |
| Thermosetting phenolic resin | 4.5 | 3.5 | 4.5 | 5 | 5.5 |
The performance of the compact calcium hexaluminate-added aluminum calcium carbon converter slag-stopping sliding plate prepared in the above embodiment is tested and characterized, and the results are shown in table 2.
TABLE 2 comparison of physicochemical properties and average service life parameters of compact calcium hexaluminate-added aluminum-calcium-carbon converter slag-blocking slide plates obtained in examples 1 to 4 with those of conventional aluminum-zirconium-carbon slide plates
From table 2, it can be known that the compact calcium hexaluminate-added aluminum calcium carbon converter slag-stopping sliding plate is tried on a converter, after the test is finished, the corrosion, cracks and plate surface conditions of the compact calcium hexaluminate-added aluminum calcium carbon converter slag-stopping sliding plate and the existing products are analyzed, the service life of the compact calcium carbon converter slag-stopping sliding plate is 17-20 times per set, and the cast hole is expanded: average erosion 50 mm; the average erosion rate was 2.78 mm/time. Through comparison, measurement and analysis with the existing product, the average erosion rate of the slag-stopping sliding plate of the aluminum-calcium-carbon converter added with compact calcium hexaluminate is less than or equal to 3 mm/time, and the erosion rate of the slag-stopping sliding plate is less than or equal to 4.5 mm/time that of the existing aluminum-zirconium-carbon product; the surface of the off-line sliding plate is smooth, casting holes are uniformly reamed, the plate surface has no steel-slag adhesion phenomenon, the crack condition is good, radioactive tiny cracks exist only on the plate surface, and the conditions of large casting hole reaming, block falling, plate surface pit forming, slag adhesion and abnormal galling do not occur, so the aluminum calcium carbon converter slag blocking sliding plate added with the compact calcium hexaluminate has excellent molten steel scouring resistance, wear resistance, erosion resistance and high temperature resistance.
Claims (8)
1. An aluminum-calcium-carbon converter slag-stopping sliding plate is obtained by adding an organic binder to a converter slag-stopping sliding plate accounting for 100 wt% in total, mixing the obtained mixture, molding the mixture, and then firing the mixture in an oxidizing atmosphere, and is characterized in that the converter slag-stopping sliding plate comprises the following components in percentage by weight: 14 to 30 percent of tabular corundum, 34 to 55 percent of calcium hexaluminate sand, 4 to 5 percent of silicon carbide and 27 to 33 percent of co-milled powder, wherein the total percentage is 100 percent; the calcium hexaluminate sand is soaked in 0.5-1.0 wt% of inorganic acid liquor for 5-10 minutes, and is dried in the shade for 2-4 hours in the dark after soaking; an organic adhesive accounting for 3.5-5.5% of the total weight is additionally arranged on the converter slag stopping sliding plate, and the organic adhesive is a phenolic resin bonding agent; the co-milled powder comprises 10-18% of calcium hexaluminate fine powder and 6-12% of alpha-Al 2 O 3 The composite material is prepared by uniformly mixing micro powder, 2-3% of metal aluminum powder, 1-2% of boron carbide fine powder, 1-4% of carbon black and 1-2% of metal silicon powder.
2. The skimming slide plate of claim 1, wherein said calcium hexaluminate sand and said calcium hexaluminate fines have a bulk density of 3.38g/cm 3 The melting point was 1875 ℃.
3. The aluminum-calcium-carbon converter slag-stopping sliding plate according to claim 2, wherein the particle size of the calcium hexaluminate sand is 3-1 mm, 1-0 mm, and the weight percentages of the particle sizes are as follows: 20-30% of calcium hexaluminate sand with the grain diameter of 3-1 mm and 14-25% of calcium hexaluminate sand with the grain diameter of 1-0 mm; the particle size of the calcium hexaluminate fine powder is 0-0.075 mm, and the weight percentage of the particle size is 10-18%.
4. The aluminum-calcium-carbon converter slag-stopping sliding plate according to claim 3, wherein the tabular corundum has particle diameters of 2-1, 1-0.5 and 0.5-0 mm, and the particle diameters are, by weight: 5-10% of plate-shaped corundum with the particle size of 2-1 mm, 4-8% of plate-shaped corundum with the particle size of 1-0.5 mm and 5-12% of plate-shaped corundum with the particle size of 0.5-0 mm.
5. The skimming slide plate of aluminum calcium carbon converter according to claim 4, wherein said silicon carbide has a particle size of 1-0 mm.
6. A method for manufacturing the aluminum calcium carbon converter slag-stopping sliding plate of any one of claims 1 to 5, which is characterized by comprising the following steps:
step one, preparing co-milled powder: mixing calcium hexaluminate fine powder and alpha-Al in percentage by weight 2 O 3 Uniformly mixing the micro powder, the metal aluminum powder, the carbon black, the boron carbide fine powder and the metal silicon powder to prepare co-milled powder;
step two, proportioning the granular materials: uniformly mixing plate-shaped corundum with the particle size of 2-1 mm, plate-shaped corundum with the particle size of 1-0.5 mm, plate-shaped corundum with the particle size of 0.5-0 mm, calcium hexaluminate sand with the particle size of 3-1 mm, calcium hexaluminate sand with the particle size of 1-0 mm and silicon carbide with the particle size of 1-0 mm according to weight percentage to obtain granular aggregate;
step three, mixing materials: uniformly mixing the granular aggregate, slowly adding a phenolic resin binding agent, finally adding the co-ground powder, and mixing to obtain a mixture;
step four, molding: pressing and forming the mixture to obtain a green brick;
step five, drying: naturally airing and placing the green bricks, and then placing the green bricks in a tunnel natural gas drying kiln for drying;
step six, firing: putting the dried qualified product into a kiln, and sintering in a medium-temperature tunnel kiln;
step seven, hooping;
step eight, grinding;
step nine, coating;
step ten, veneering;
and step eleven, packaging.
7. The method for manufacturing the skimming slide plate of the AlCal-carbonaceous converter as claimed in claim 6, wherein the drying temperature in the fifth step is set as follows: the initial temperature of the raw materials entering the kiln is 30 ℃, the temperature is increased from 30 ℃ to 80 ℃ within 4 hours, the temperature is kept for 1 hour, the temperature is increased from 80 ℃ to 120 ℃ within 4 hours, the temperature is kept for 1 hour, the temperature is increased from 120 ℃ to 150 ℃ within 3 hours, the temperature is kept for 1 hour, the temperature is increased from 150 ℃ to 180 ℃ within 3 hours, the temperature is kept for 1 hour, the temperature is increased from 180 ℃ to 210 ℃ within 3 hours, and the temperature is kept for 16 hours at 210 ℃; the total drying time was 37 hours.
8. The method for preparing the aluminum-calcium-carbon converter slag-stopping sliding plate according to claim 7, wherein the sintering atmosphere in the sixth step is an oxidizing atmosphere, the highest sintering temperature is 600 ℃, and the specific sintering process curve is as follows: heating from room temperature to 200 ℃ within 9 hours, heating from 200 ℃ to 300 ℃ within 12 hours, heating from 300 ℃ to 400 ℃ within 12 hours, heating from 400 ℃ to 600 ℃ within 10 hours, and keeping the temperature at 600 ℃ for 15 hours, wherein the total firing time is 58 hours; and stopping fire, airing the kiln, cooling the kiln to 300 ℃, loosening a handle of a kiln door, cooling the kiln to 200 ℃, opening the kiln door for natural cooling, taking the kiln out of the kiln after cooling to 100 ℃ in the kiln, and enabling the qualified product to enter the next procedure after inspection.
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