CN111689780A - Refractory material for Acheson closed resistance furnace and preparation method thereof - Google Patents
Refractory material for Acheson closed resistance furnace and preparation method thereof Download PDFInfo
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention belongs to the technical field of refractory materials, and particularly relates to a refractory material for an Airson closed resistance furnace and a preparation method thereof, wherein the refractory material comprises the following raw materials in parts by weight: 1-2 parts of dolomite, such as 1-2 parts of corundum, 2-3 parts of bauxite, 1-2 parts of mullite, 2-3 parts of hematite, 1-2 parts of silicon carbide and 3-4 parts of binder. The invention has the advantages of strong heat resistance and long service life.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a refractory material for an Airson closed resistance furnace and a preparation method thereof.
Background
The resistance furnace is an industrial furnace which heats a workpiece or a material by heating an electric heating element or a heating medium in the furnace by using current. It is a heating furnace that generates heat energy by passing current through resistive materials. An Acheson closed resistance furnace is an indirect heating resistance furnace, in which a resistor body, called an electric heating body, is installed to perform electric-thermal conversion, and heat energy is transferred to materials in the furnace. The furnace shell of the electric furnace is made of steel plates, a hearth is lined with refractory materials, and materials are placed in the hearth.
The refractory material is an inorganic non-metallic material with refractoriness of not less than 1580 ℃, better thermal shock resistance and chemical erosion resistance, low thermal conductivity coefficient and low expansion coefficient. The material is used as structural material for high temperature kiln, furnace and other thermal equipment and industrial high temperature container and part and can bear corresponding physical and chemical change and mechanical action.
The existing refractory materials still cannot meet the requirements of equipment such as an Acheson closed resistance furnace in terms of heat insulation capability, service life and the like.
Disclosure of Invention
The invention provides a refractory material for an Acheson closed resistance furnace, a preparation method and a preparation process thereof, and aims to solve the problems in the background art.
The invention provides a refractory material for an Acheson closed resistance furnace, which comprises the following raw materials in parts by weight: 1-2 parts of dolomite, such as 1-2 parts of corundum, 2-3 parts of bauxite, 1-2 parts of mullite, 2-3 parts of hematite, 1-2 parts of silicon carbide and 3-4 parts of binder.
Preferably, the binder comprises silica and clay, and the ratio of silica to clay is 3:2
The invention also provides a preparation method of the refractory material for the Acheson closed resistance furnace, which comprises the following steps:
(1) manually selecting from mining grading stacking, sorting waste rocks with high impurity content, and stacking respectively in different grades;
(2) washing: washing the ore with water before processing the washed raw material to wash away soil and impurities adhered to the surface of the ore;
(3) coarse crushing, namely crushing the large-particle raw material into small particles by a jaw crusher;
(4) fine crushing, namely conveying the small particles crushed in the step (3) to a cone crusher through a belt to further crush the small particles into small particles;
(5) screening, namely screening the fine crushed small particles in the step 4 by using a mechanical vibrating screen; the unqualified part of the grain size is screen material, and the qualified part is screen material; feeding the oversize material back by a belt for crushing again; the sieve body is strongly vibrated with the amplitude of 0.5-5mm and the frequency of 600-;
(6) crushing, namely grinding the sieved material in the step 5 into powder of less than 200-300 meshes by a Raymond mill, and then feeding the powder into respective bins;
(7) magnetic separation, namely performing magnetic separation on the powder crushed in the step 6, and sorting in an uneven magnetic field to remove impurities such as iron, titanium and the like;
(8) proportioning, namely accurately weighing the powder subjected to magnetic separation in the step 7 by an automatic proportioning system according to a proportion, feeding the powder into a mixing roll through a feeding machine, and simultaneously adding the weighed binding agent into the mixing roll;
(9) mixing, namely mixing and extruding materials with different components and particle sizes and a proper amount of bonding agent in a forced mixer to achieve uniform distribution and full wetting, and then feeding the materials into a pug tank in the form of pug;
(10) molding, namely conveying the mixed pug in the pug tank to a press molding workshop by using a manual flat car, and pressing the pug into a green brick by using a friction press, wherein the power for pressing is provided by an air compression station;
(11) and (3) drying: drying the formed green brick in a tunnel kiln, wherein the drying temperature in the tunnel kiln is about 110-120 ℃, and the drying time is controlled to be 2-3 hours;
(12) sintering, namely sintering at the temperature of 1400 ℃ to 1500 ℃ in the tunnel kiln, wherein the fuel is urban gas or coal gas; the sintering time is controlled to be 5-6 hours;
(13) after the baked green bricks are cooled, inspecting the product; the inspection is divided into object inspection and chemical inspection;
(14) and (5) packaging the qualified product, and recycling the unqualified product in the first step.
Compared with the prior art, the invention has the beneficial effects that: by adding the chromite, the corrosion resistance to the steel slag is good, and the service life of the refractory material can be effectively prolonged; by adding the silicon carbide, the heat expansion coefficient of the silicon carbide is very low, the heat conductivity is high, the heat and shock resistance is good, and the high-temperature strength is high, so that the refractory material is not softened even after being used at high temperature for a long time, is not corroded by any acid or alkali, has good salt resistance, is not wetted by metal and slag, and is light in weight.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The invention provides a refractory material for an Acheson closed resistance furnace, which comprises the following raw materials in parts by weight: 1 part of dolomite, such as 1 part of corundum, 2 parts of bauxite, 1 part of mullite, 2 parts of hematite, 1 part of silicon carbide and 3 parts of binder. The binder comprises silica and clay, and the ratio of silica to clay is 3: 2.
The invention also provides a preparation method of the refractory material for the Acheson closed resistance furnace, which comprises the following steps:
(1) manually selecting from mining grading stacking, sorting waste rocks with high impurity content, and stacking respectively in different grades;
(2) washing: washing the ore with water before processing the washed raw material to wash away soil and impurities adhered to the surface of the ore;
(3) coarse crushing, namely crushing the large-particle raw material into small particles by a jaw crusher;
(4) fine crushing, namely conveying the small particles crushed in the step (3) to a cone crusher through a belt to further crush the small particles into small particles;
(5) screening, namely screening the fine crushed small particles in the step 4 by using a mechanical vibrating screen; the unqualified part of the grain size is screen material, and the qualified part is screen material; feeding the oversize material back by a belt for crushing again; the sieve body is strongly vibrated at the amplitude of 0.5-5mm and the frequency of 600-;
(6) crushing, namely grinding the sieved material in the step 5 into powder of less than 200-300 meshes by a Raymond mill, and then feeding the powder into respective bins;
(7) magnetic separation, namely performing magnetic separation on the powder crushed in the step 6, and sorting in an uneven magnetic field to remove impurities such as iron, titanium and the like;
(8) proportioning, namely accurately weighing the powder subjected to magnetic separation in the step 7 by an automatic proportioning system according to a proportion, feeding the powder into a mixing roll through a feeding machine, and simultaneously adding the weighed binding agent into the mixing roll;
(9) mixing, namely mixing and extruding materials with different components and particle sizes and a proper amount of bonding agent in a forced mixer to achieve uniform distribution and full wetting, and then feeding the materials into a pug tank in the form of pug;
(10) molding, namely conveying the mixed pug in the pug tank to a press molding workshop by using a manual flat car, and pressing the pug into a green brick by using a friction press, wherein the power for pressing is provided by an air compression station;
(11) and (3) drying: drying the formed green brick in a tunnel kiln, wherein the drying temperature in the tunnel kiln is about 110-120 ℃, and the drying time is controlled to be 2-3 hours;
(12) sintering, namely sintering at the temperature of 1400 ℃ to 1500 ℃ in the tunnel kiln, wherein the fuel is urban gas or coal gas; the sintering time is controlled to be 5-6 hours; the tunnel kiln is generally a long linear tunnel, two sides and the top of the tunnel kiln are provided with fixed walls and vault, and a kiln car runs on a track laid at the bottom of the tunnel kiln; the combustion equipment is arranged at two sides of the middle part of the tunnel kiln to form a fixed high-temperature zone, namely a burning zone, high-temperature flue gas generated by combustion flows towards the kiln head along the tunnel under the action of the front-end flue gas of the tunnel kiln or an induced draft fan, and simultaneously gradually preheats products entering the kiln, and the section forms a preheating zone of the tunnel kiln; blowing cold air into the tail of the tunnel kiln to cool the product at the later section in the tunnel kiln, pumping out the blown cold air after the blown cold air flows through the product and is heated, and feeding the cooled cold air into a drier to be used as a heat source for drying green bodies, wherein the section forms a cooling zone of the tunnel kiln; placing sagger containing ceramic product on the trolley, continuously pushing in slowly (usually mechanically) from the inlet of the preheating zone, and gradually pushing out the trolley with the burnt product from the outlet of the cooling zone;
(13) after the baked green bricks are cooled, inspecting the product; the inspection is divided into object inspection and chemical inspection; the physical inspection comprises the inspection of the length, width, height, air holes and high-temperature creep of the brick; chemical examination generally carries out detailed examination on whether the components of the product meet the required content;
(14) and (5) packaging the qualified product, and recycling the unqualified product in the first step.
Example 2
The invention provides a refractory material for an Acheson closed resistance furnace, which comprises the following raw materials in parts by weight: 1.5 parts of dolomite, such as 1.5 parts of corundum, 2.5 parts of bauxite, 1.5 parts of mullite, 2.5 parts of pyrrhotite, 1.5 parts of silicon carbide and 3.5 parts of binder. The binder comprises silica and clay, and the ratio of silica to clay is 3: 2.
The invention also provides a preparation method of the refractory material for the Acheson closed resistance furnace, which comprises the following steps:
(1) manually selecting from mining grading stacking, sorting waste rocks with high impurity content, and stacking respectively in different grades;
(2) washing: washing the ore with water before processing the washed raw material to wash away soil and impurities adhered to the surface of the ore;
(3) coarse crushing, namely crushing the large-particle raw material into small particles by a jaw crusher;
(4) fine crushing, namely conveying the small particles crushed in the step (3) to a cone crusher through a belt to further crush the small particles into small particles;
(5) screening, namely screening the fine crushed small particles in the step 4 by using a mechanical vibrating screen; the unqualified part of the grain size is screen material, and the qualified part is screen material; feeding the oversize material back by a belt for crushing again; the sieve body is strongly vibrated at the amplitude of 0.5-5mm and the frequency of 600-;
(6) crushing, namely grinding the sieved material in the step 5 into powder of less than 200-300 meshes by a Raymond mill, and then feeding the powder into respective bins;
(7) magnetic separation, namely performing magnetic separation on the powder crushed in the step 6, and sorting in an uneven magnetic field to remove impurities such as iron, titanium and the like;
(8) proportioning, namely accurately weighing the powder subjected to magnetic separation in the step 7 by an automatic proportioning system according to a proportion, feeding the powder into a mixing roll through a feeding machine, and simultaneously adding the weighed binding agent into the mixing roll;
(9) mixing, namely mixing and extruding materials with different components and particle sizes and a proper amount of bonding agent in a forced mixer to achieve uniform distribution and full wetting, and then feeding the materials into a pug tank in the form of pug;
(10) molding, namely conveying the mixed pug in the pug tank to a press molding workshop by using a manual flat car, and pressing the pug into a green brick by using a friction press, wherein the power for pressing is provided by an air compression station;
(11) and (3) drying: drying the formed green brick in a tunnel kiln, wherein the drying temperature in the tunnel kiln is about 110-120 ℃, and the drying time is controlled to be 2-3 hours;
(12) sintering, namely sintering at the temperature of 1400 ℃ to 1500 ℃ in the tunnel kiln, wherein the fuel is urban gas or coal gas; the sintering time is controlled to be 5-6 hours; the tunnel kiln is generally a long linear tunnel, two sides and the top of the tunnel kiln are provided with fixed walls and vault, and a kiln car runs on a track laid at the bottom of the tunnel kiln; the combustion equipment is arranged at two sides of the middle part of the tunnel kiln to form a fixed high-temperature zone, namely a burning zone, high-temperature flue gas generated by combustion flows towards the kiln head along the tunnel under the action of the front-end flue gas of the tunnel kiln or an induced draft fan, and simultaneously gradually preheats products entering the kiln, and the section forms a preheating zone of the tunnel kiln; blowing cold air into the tail of the tunnel kiln to cool the product at the later section in the tunnel kiln, pumping out the blown cold air after the blown cold air flows through the product and is heated, and feeding the cooled cold air into a drier to be used as a heat source for drying green bodies, wherein the section forms a cooling zone of the tunnel kiln; placing sagger containing ceramic product on the trolley, continuously pushing in slowly (usually mechanically) from the inlet of the preheating zone, and gradually pushing out the trolley with the burnt product from the outlet of the cooling zone;
(13) after the baked green bricks are cooled, inspecting the product; the inspection is divided into object inspection and chemical inspection; the physical inspection comprises the inspection of the length, width, height, air holes and high-temperature creep of the brick; chemical examination generally carries out detailed examination on whether the components of the product meet the required content;
(14) and (5) packaging the qualified product, and recycling the unqualified product in the first step.
Example 3
The invention provides a refractory material for an Acheson closed resistance furnace, which comprises the following raw materials in parts by weight: 1-2 parts of dolomite, such as 1-2 parts of corundum, 2-3 parts of bauxite, 1-2 parts of mullite, 2-3 parts of hematite, 1-2 parts of silicon carbide and 3-4 parts of binder. The binder comprises silica and clay, and the ratio of silica to clay is 3: 2.
The invention also provides a preparation method of the refractory material for the Acheson closed resistance furnace, which comprises the following steps:
(1) manually selecting from mining grading stacking, sorting waste rocks with high impurity content, and stacking respectively in different grades;
(2) washing: washing the ore with water before processing the washed raw material to wash away soil and impurities adhered to the surface of the ore;
(3) coarse crushing, namely crushing the large-particle raw material into small particles by a jaw crusher;
(4) fine crushing, namely conveying the small particles crushed in the step (3) to a cone crusher through a belt to further crush the small particles into small particles;
(5) screening, namely screening the fine crushed small particles in the step 4 by using a mechanical vibrating screen; the unqualified part of the grain size is screen material, and the qualified part is screen material; feeding the oversize material back by a belt for crushing again; the sieve body is strongly vibrated at the amplitude of 0.5-5mm and the frequency of 600-;
(6) crushing, namely grinding the sieved material in the step 5 into powder of less than 200-300 meshes by a Raymond mill, and then feeding the powder into respective bins;
(7) magnetic separation, namely performing magnetic separation on the powder crushed in the step 6, and sorting in an uneven magnetic field to remove impurities such as iron, titanium and the like;
(8) proportioning, namely accurately weighing the powder subjected to magnetic separation in the step 7 by an automatic proportioning system according to a proportion, feeding the powder into a mixing roll through a feeding machine, and simultaneously adding the weighed binding agent into the mixing roll;
(9) mixing, namely mixing and extruding materials with different components and particle sizes and a proper amount of bonding agent in a forced mixer to achieve uniform distribution and full wetting, and then feeding the materials into a pug tank in the form of pug;
(10) molding, namely conveying the mixed pug in the pug tank to a press molding workshop by using a manual flat car, and pressing the pug into a green brick by using a friction press, wherein the power for pressing is provided by an air compression station;
(11) and (3) drying: drying the formed green brick in a tunnel kiln, wherein the drying temperature in the tunnel kiln is about 110-120 ℃, and the drying time is controlled to be 2-3 hours;
(12) sintering, namely sintering at the temperature of 1400 ℃ to 1500 ℃ in the tunnel kiln, wherein the fuel is urban gas or coal gas; the sintering time is controlled to be 5-6 hours; the tunnel kiln is generally a long linear tunnel, two sides and the top of the tunnel kiln are provided with fixed walls and vault, and a kiln car runs on a track laid at the bottom of the tunnel kiln; the combustion equipment is arranged at two sides of the middle part of the tunnel kiln to form a fixed high-temperature zone, namely a burning zone, high-temperature flue gas generated by combustion flows towards the kiln head along the tunnel under the action of the front-end flue gas of the tunnel kiln or an induced draft fan, and simultaneously gradually preheats products entering the kiln, and the section forms a preheating zone of the tunnel kiln; blowing cold air into the tail of the tunnel kiln to cool the product at the later section in the tunnel kiln, pumping out the blown cold air after the blown cold air flows through the product and is heated, and feeding the cooled cold air into a drier to be used as a heat source for drying green bodies, wherein the section forms a cooling zone of the tunnel kiln; placing sagger containing ceramic product on the trolley, continuously pushing in slowly (usually mechanically) from the inlet of the preheating zone, and gradually pushing out the trolley with the burnt product from the outlet of the cooling zone;
(13) after the baked green bricks are cooled, inspecting the product; the inspection is divided into object inspection and chemical inspection; the physical inspection comprises the inspection of the length, width, height, air holes and high-temperature creep of the brick; chemical examination generally carries out detailed examination on whether the components of the product meet the required content;
(14) and (5) packaging the qualified product, and recycling the unqualified product in the first step.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The refractory material for the Acheson closed resistance furnace is characterized by comprising the following raw materials in parts by weight: 1-2 parts of dolomite, such as 1-2 parts of corundum, 2-3 parts of bauxite, 1-2 parts of mullite, 2-3 parts of hematite, 1-2 parts of silicon carbide and 3-4 parts of binder.
2. The refractory according to claim 1, wherein the binder comprises silica and clay, and the ratio of silica to clay is 3: 2.
3. The method for preparing the refractory material for the Acheson closed resistance furnace as claimed in claims 1 to 2, comprising the steps of:
(1) manually selecting from mining grading stacking, sorting waste rocks with high impurity content, and stacking respectively in different grades;
(2) washing: washing the ore with water before processing the washed raw material to wash away soil and impurities adhered to the surface of the ore;
(3) coarse crushing, namely crushing the large-particle raw material into small particles by a jaw crusher;
(4) fine crushing, namely conveying the small particles crushed in the step (3) to a cone crusher through a belt to further crush the small particles into small particles;
(5) screening, namely screening the fine crushed small particles in the step 4 by using a mechanical vibrating screen; the unqualified part of the grain size is screen material, and the qualified part is screen material; feeding the oversize material back by a belt for crushing again; the sieve body is strongly vibrated with the amplitude of 0.5-5mm and the frequency of 600-;
(6) crushing, namely grinding the sieved material in the step 5 into powder of less than 200-300 meshes by a Raymond mill, and then feeding the powder into respective bins;
(7) magnetic separation, namely performing magnetic separation on the powder crushed in the step 6, and sorting in an uneven magnetic field to remove impurities such as iron, titanium and the like;
(8) proportioning, namely accurately weighing the powder subjected to magnetic separation in the step 7 by an automatic proportioning system according to a proportion, feeding the powder into a mixing roll through a feeding machine, and simultaneously adding the weighed binding agent into the mixing roll;
(9) mixing, namely mixing and extruding materials with different components and particle sizes and a proper amount of bonding agent in a forced mixer to achieve uniform distribution and full wetting, and then feeding the materials into a pug tank in the form of pug;
(10) molding, namely conveying the mixed pug in the pug tank to a press molding workshop by using a manual flat car, and pressing the pug into a green brick by using a friction press, wherein the power for pressing is provided by an air compression station;
(11) and (3) drying: drying the formed green brick in a tunnel kiln, wherein the drying temperature in the tunnel kiln is about 110-120 ℃, and the drying time is controlled to be 2-3 hours;
(12) sintering, namely sintering at the temperature of 1400 ℃ to 1500 ℃ in the tunnel kiln, wherein the fuel is urban gas or coal gas; the sintering time is controlled to be 5-6 hours;
(13) after the baked green bricks are cooled, inspecting the product; the inspection is divided into object inspection and chemical inspection;
(14) and (5) packaging the qualified product, and recycling the unqualified product in the first step.
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| CN114380609A (en) * | 2022-02-21 | 2022-04-22 | 江苏朗耐德耐火材料有限公司 | Refractory material for deacidification furnace refractory layer and preparation method thereof |
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