CN111517765B - Production process and production equipment of high-purity corundum cast brick - Google Patents
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Abstract
High purityA technology for producing fused cast corundum brick includes such steps as preparing mixture, smelting, casting, annealing and demoulding, and features use of Al as raw material2O398-99.5 parts of Na20.1-0.8 part of O, SiO20.1-0.5 part of CaO + MgO, 0-0.1 part of Fe2O3+TiO20-0.1 part; wherein the melting process comprises the following steps: 1/2-3/5 molten materials are reserved in the furnace body, and clinker is directly poured into the center of the furnace body through a hopper; after the clinker is poured, the raw materials are delivered to one point or a plurality of points on the edge of the highest liquid level of the furnace body at the speed of 30-50 kg/s; mixing the raw materials before the raw materials enter a furnace body, and then extruding the raw materials to prepare tablets, wherein the pressure of the extruded raw materials is 100-120 MPa, the extrusion time is 5-10min, and the thickness of the prepared tablets is 1-2.5 cm; heating the pressed tablets to 1200-1600 ℃ in a microwave oven; crushing the heated tablets into 5-8mm particles; the crushed particles are poured into the furnace body within the range of 10-25cm from the side wall of the furnace body. The process and the equipment can effectively improve the product quality and the production efficiency.
Description
Technical Field
The invention relates to the technical field of electric melting high-purity corundum bricks, in particular to a production process and production equipment of electric melting high-purity corundum bricks.
Background
When the high-purity corundum cast brick is produced, the proportion of corundum in the components is more than 98%, and the mass of single melting and casting is usually more than two tons, so that small components are easy to mix unevenly in a melting process. In addition, the powder is added into the molten liquid to be wrapped by gas, and pores are easy to form if the gas is not smoothly exhausted in later casting, so that unqualified products are formed.
Disclosure of Invention
The invention aims to provide a production process and production equipment of a high-purity corundum cast brick, which improve the production efficiency, lower the product porosity and more uniform components.
A production process of a high-purity corundum cast brick comprises the steps of preparing a mixture, melting, casting, heat-preserving annealing and demolding, and is characterized in that the mixture comprises, by weight, Al2O 398-99.5 parts, Na2O 0.1-0.8 part, SiO20.1-0.5 part, CaO + MgO 0-0.1 part and Fe2O3+ TiO 20-0.1 part; the ingredients comprise raw materials and clinker which are mixed in the same ratio, wherein the clinker is a blocky substance with the grain diameter of 3-8cm, and the raw materials are powder with the grain diameter of 0.05-1.5 mm; clinker accounts for 10-30%;
wherein the melting process comprises the following steps: 1/2-3/5 molten materials are reserved in the furnace body, and clinker is directly poured into the center of the furnace body through a hopper; after the clinker is poured, the raw materials are delivered to one point or a plurality of points on the edge of the highest liquid level of the furnace body at the speed of 30-50 kg/s; mixing the raw materials before the raw materials enter a furnace body, and then extruding the raw materials to prepare tablets, wherein the pressure of the extruded raw materials is 100-120 MPa, the extrusion time is 5-10min, and the thickness of the prepared tablets is 1-2.5 cm; heating the pressed tablets to 1200-1600 ℃ in a microwave oven; crushing the heated tablets into 5-8mm particles; the crushed particles are poured into the furnace body within the range of 10-25cm from the side wall of the furnace body.
Preferably, the microwave emitter emits microwaves to the surface of the tablet, the operating frequency of the microwave source is 2450MHz, and the input power is 850-.
The production equipment comprises an electric arc furnace, and is characterized by further comprising a roller press assembly, a microwave oven, a heating assembly and a crushing part.
The roller press assembly comprises a pressing roller and a die, the die comprises a cuboid-shaped material paving groove and a steel plate, and the shape and the size of an opening of the steel plate and the material paving groove are the same.
The microwave oven comprises a heating part, a collecting part, a plugboard, a microwave emitter, a dragging plate and a hammer; the heating part and the collecting part form a cuboid box body, the plugboard is vertically inserted into the box body to divide the box body into the heating part and the collecting part, a heating assembly is fixed in the heating part, the heating assembly comprises a microwave emitter and a dragging plate, the dragging plate is obliquely arranged downwards, the included angle between the plane and the horizontal plane is 10-20 degrees, and the microwave emitter is fixed on the upper side of the dragging plate; a horizontal through groove is formed in the plug board, and the longitudinal opening height of the through groove is greater than the longitudinal height between the bottom end of the fixed plate where the microwave emitter is located and the top end of the carriage and is smaller than the height between the top end of the fixed plate where the microwave emitter is located and the bottom end of the carriage; the side surface of the inserting plate is in sliding sealing fit with the side surface of the box body; the top end of the inserting plate extends out of the box body and can move up and down; therefore, the plug board can align the transverse through groove with the gap between the planker and the lower end of the fixing plate where the microwave emitter is located by moving up and down, so that the pressing sheet on the planker can fall into the collecting part through the through groove.
Further, the bottom end of the collecting part is communicated with the top end of the crushing part, the crushing part comprises a shell, a hammer is arranged in the shell and used for crushing the pressing sheet falling from the collecting part.
The invention has the advantages that the uniformity of the components at the later stage can be ensured through mixing and tabletting, the liquid phase is generated in the material through pressing and microwave heating sintering, the powder is adhered, the material can also keep the uniformity and the stability of the equivalent component proportion when entering an electric arc furnace, meanwhile, the gas in the material is less, and the product quality and the yield are improved. In addition, the microwave heating efficiency is higher, the melting process efficiency is improved, and the energy consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention.
In the figure, a microwave oven 10, a heating part 11, a collecting part 12, a plug board 13, a heating assembly 20, a microwave emitter 21, a planker 22, a crushing part 30 and a hammer 31 are shown.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
A production process of a high-purity corundum cast brick comprises the steps of preparing a mixture, melting, casting, heat-preserving annealing and demolding, wherein the mixture comprises 398-99.5 parts by weight of Al2O, 0.1-0.8 part by weight of Na2O 0.1, 20.1-0.5 part by weight of SiOx, 0-0.1 part by weight of CaO and MgO, and 0-0.1 part by weight of Fe2O3 and TiO 20; the ingredients comprise raw materials and clinker which are mixed in the same ratio, wherein the clinker is a blocky substance with the grain diameter of 3-8cm, and the raw materials are powder with the grain diameter of 0.05-1.5 mm; clinker accounts for 10-30%;
wherein the ingredients are selected in various ranges according to the parts by weight, three examples are provided:
1. 398 parts of Al2O, 0.8 part of Na2O 0.8 and 20.5 parts of SiOs;
2. Al2O398.5 parts, Na2O 0.3.3 parts, SiO20.3 parts, CaO + MgO 0.05 parts, Fe2O3+ TiO20.05 parts;
3. Al2O399.5 parts, Na2O 0.1.1 parts, SiO20.1 parts, CaO + MgO 0.1 part, Fe2O3+ TiO20.1 parts;
wherein the melting process comprises the following steps: 1/2-3/5 molten materials are reserved in the furnace body 10, and clinker is directly poured into the center of the furnace body through a hopper; after the clinker is poured, the raw materials are delivered to one point or a plurality of points on the edge of the highest liquid level of the furnace body at the speed of 30-50 kg/s; mixing the raw materials before the raw materials enter a furnace body, and then extruding the raw materials to prepare tablets, wherein the pressure of the extruded raw materials is 100-120 MPa, the extrusion time is 5-10min, and the thickness of the prepared tablets is 1-2.5 cm; heating the pressed tablets to 1200-1600 ℃ in a microwave oven; crushing the heated tablets into 5-8mm particles; pouring the crushed particles into the furnace body within a distance range of 10-25cm from the side wall of the furnace body;
the microwave emitter emits microwaves to the surface of the material layer, the working frequency of the microwave source is 2450MHz, the input power is 850-.
Based on the above process, as shown in fig. 1, a production apparatus includes an electric arc furnace, further including a roller press assembly, a microwave oven 10, a heating assembly 20, and a crushing section 30;
the rolling machine assembly comprises a pressing roller and a die, the die comprises a cuboid spreading groove and a steel plate, and the shape and the size of an opening of the steel plate and the spreading groove are the same; spreading the mixture in a spreading groove, pressing a steel plate, extruding a die by using a pressing roller, and pouring out an extruded pressing sheet for later use;
the microwave oven 10 comprises a heating part 11, a collecting part 12, a plug board 13, a microwave emitter 21, a planker 22 and a hammer 31; the heating part 11 and the collecting part 12 form a cuboid box body, the plug board 13 is vertically inserted into the box body to divide the box body into the heating part 11 and the collecting part 12, a heating assembly 20 is fixed in the heating part 11, the heating assembly comprises a microwave emitter 21 and a carriage 22, the carriage 22 is obliquely arranged downwards, the included angle between the plane and the horizontal plane is 10-20 degrees, and the microwave emitter 21 is fixed on the upper side of the carriage 22; a horizontal through groove 131 is formed in the inserting plate 13, and the longitudinal opening height of the through groove 131 is greater than the longitudinal height between the bottom end of the fixing plate where the microwave emitter 21 is located and the top end of the carriage 22 and is less than the height between the top end of the fixing plate where the microwave emitter 21 is located and the bottom end of the carriage 22; the side surface of the inserting plate 13 is in sliding sealing fit with the side surface of the box body; the top end of the inserting plate 13 extends out of the box body and can move up and down; thus, the inserting plate 13 can move up and down to align the transverse through groove 131 with the gap at the lower end between the planker 22 and the fixing plate where the microwave emitter 21 is located, so that the pressing sheet on the planker 22 can fall into the collecting part 12 through the through groove 131;
the bottom end of the collecting part 12 is communicated with the top end of the crushing part 30, the crushing part 30 comprises a shell, and a hammer crack 31 is positioned in the shell, and the hammer crack 31 is used for crushing a pressing sheet falling from the collecting part 12.
The mixture is rolled by a roller press to prepare a pressed sheet, the pressed sheet is heated to 1200-1600 ℃ under microwave, semi-sintering can be carried out, and liquid is generated inside the pressed sheet. The mixture can be basically cohered around the liquid phase at a fixed mixture ratio; the hammer breaks the tablet to break the tablet into small particles, which is convenient for the subsequent melting process.
After pressing and microwave semi-sintering, on the one hand, the material is rapidly heated, and is preheated for subsequent melting procedures, and on the other hand, pre-pressing and sintering enable the raw material to be compact, the gas wrapped by the material is less, the gas content in the subsequent melting material is lower, and the microstructure is more compact. Meanwhile, as the major component is corundum, the minor component has small proportion, so that the condition of uneven components is easy to occur, and after the raw materials are mixed and pressed, under the condition of semi-sintering, the liquid-phase adhesive powder forms more stable component proportion, so that the condition of uneven components is not easy to occur.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A production process of a high-purity corundum cast brick comprises the steps of mixture preparation, melting, casting, heat preservation annealing and demoulding, and is characterized in that Al is calculated according to the weight part of ingredients2O3 98-99.5 parts of Na20.1-0.8 part of O, SiO20.1-0.5 part of CaO + MgO, 0-0.1 part of Fe2O3 +TiO20-0.1 part; the ingredients comprise raw materials and clinker, the mixture ratio of the raw materials and the clinker is the same, the clinker is a blocky substance with the grain diameter of 3-8cm, and the raw materials are powder with the grain diameter of 0.05-1.5 mm; clinker accounts for 10-30%;
wherein the melting process comprises the following steps: 1/2-3/5 molten materials are reserved in the furnace body, and clinker is directly poured into the center of the furnace body through a hopper;
after the clinker is poured, the raw materials are delivered to one point or a plurality of points on the edge of the highest liquid level of the furnace body at the speed of 30-50 kg/s;
mixing the raw materials before the raw materials enter a furnace body, and then extruding the raw materials to prepare tablets, wherein the pressure of the extruded raw materials is 100-120 MPa, the extrusion time is 5-10min, and the thickness of the prepared tablets is 1-2.5 cm; heating the pressed tablets to 1200-1600 ℃ in a microwave oven; crushing the heated tablets into 5-8mm particles; the crushed particles are poured into the furnace body within the range of 10-25cm from the side wall of the furnace body.
2. The process for producing a high-purity corundum fused and cast brick as claimed in claim 1, wherein the microwave emitter emits microwaves to the surface of the pressed piece, the operating frequency of the microwave source is 2450MHz, and the input power is 850- & 1200W continuously adjustable.
3. An apparatus for performing a process for producing a high-purity corundum fused cast brick according to claim 1, comprising an electric arc furnace, characterized by further comprising a roller press assembly, a microwave oven and a crushing section;
the roller press assembly comprises a pressing roller and a die, the die comprises a rectangular spreading groove and a steel plate, and the shape and the size of an opening of the steel plate and the spreading groove are the same;
the microwave oven comprises a heating part, a collecting part, a plugboard, a microwave emitter and a planker; the heating part and the collecting part form a cuboid box body, the plug board is vertically inserted into the box body to divide the box body into the heating part and the collecting part, a heating assembly is fixed in the heating part, the heating assembly comprises a microwave emitter and a dragging plate, the dragging plate is obliquely arranged downwards, the included angle between the plane of the dragging plate and the horizontal plane is 10-20 degrees, and the microwave emitter is fixed on the upper side of the dragging plate; a horizontal through groove is formed in the plug board, and the longitudinal opening height of the through groove is greater than the longitudinal height between the bottom end of the fixed plate where the microwave emitter is located and the top end of the carriage and is smaller than the height between the top end of the fixed plate where the microwave emitter is located and the bottom end of the carriage; the side surface of the inserting plate is in sliding sealing fit with the side surface of the box body; the top end of the inserting plate extends out of the box body and can move up and down; therefore, the inserting plate can align the horizontal through groove with the gap between the dragging plate and the fixing plate where the microwave emitter is located by moving up and down, so that the pressing sheet on the dragging plate can fall into the collecting part through the through groove;
the bottom end of the collecting part is communicated with the top end of the crushing part, the crushing part comprises a shell, a hammer is arranged in the shell and used for crushing tablets falling from the collecting part.
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| CN102241521A (en) * | 2010-05-13 | 2011-11-16 | 郑州振中电熔锆业有限公司 | High-temperature wear-resistance brick and casting method thereof |
| CN102538468B (en) * | 2010-12-17 | 2014-12-17 | 瑞泰科技股份有限公司 | Low-heat-conduction fused cast zirconia-corundum compound bricks and production method thereof |
| CN102503476B (en) * | 2011-10-28 | 2013-06-05 | 郑州远东耐火材料有限公司 | Production method of electric smelting zircon corundum brick |
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