CN115626814B - Converter large fabric produced by using magnesite tailing powder and preparation method thereof - Google Patents
Converter large fabric produced by using magnesite tailing powder and preparation method thereof Download PDFInfo
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- CN115626814B CN115626814B CN202211292263.5A CN202211292263A CN115626814B CN 115626814 B CN115626814 B CN 115626814B CN 202211292263 A CN202211292263 A CN 202211292263A CN 115626814 B CN115626814 B CN 115626814B
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- C04B35/03—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 based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C04B2235/5276—Whiskers, spindles, needles or pins
Abstract
The invention relates to a converter large fabric produced by using magnesite tailing powder and a preparation method thereof, wherein the converter large fabric is prepared from the following raw materials in parts by weight: 57-80 parts of sintered magnesia, 15-25 parts of magnesite tailing balls, 12-20 parts of composite carbon source composed of petroleum coke modified asphalt and coal coke modified asphalt, 2.5-4.5 parts of fluidizer composed of refined naphthalene and/or p-tert-butylphenol, and composite sintering toughening agent composed of silicon carbide micro powder and basic magnesium sulfate whisker and iron powder: 0.2 to 2.0 parts of composite antioxidant consisting of metal aluminum powder and metal silicon powder: 2.0 to 5.5 portions. The invention can effectively meet the use performance requirements of steel mill users on the large shell fabric of the converter, can reduce the consumption of magnesia, and realizes the scientific development view of green low-carbon sustainable development of magnesite resources.
Description
Technical Field
The invention relates to the technical field of refractory materials for protecting a steel smelting converter, in particular to a large converter shell fabric produced by using magnesite tailing powder and a preparation method thereof.
Background
The reserve of magnesite in China is about 31 hundred million tons, accounts for 30.1% of the world's exploration reserve, and is the first place in the world. The storage capacity is 25.77 hundred million tons and is about 85 percent of the total content of the whole country and 20 percent of the total content of the world, and the storage capacity is mainly distributed in the places such as wide pudding, sea city, large stone bridge, village, phoenix city and the like in Liaoning. One of the prominent problems in the current exploitation and utilization of magnesite is the serious waste of resources. For economic reasons and lack of suitable ore dressing technologies, many mines only collect rich ores, but discard so-called lean ores, and in practice, the grade of MgO in the so-called lean ores is above 40%, while foreign magnesite is mined, and ores with MgO grade less than 30% are mined and utilized. Some mines in China have less than 50% of mining rate, even lower mining rate, and great waste of resources is caused. It is known from field investigation that the price of magnesite containing more than 47% MgO is 130 yuan per ton, while magnesite containing 44-46% MgO is only 20-30 yuan per ton, and the proportion of the ore accounts for more than 70% of the total reserve. According to the industrial standard YB/T5208-2016 (magnesite), the quality requirements of magnesite products for producing magnesite, light burned magnesia and magnesium composite material mailing smelting flux are detected in table 1, wherein 33-45% of low-grade magnesite is piled up in a large amount as tailings, and the low-grade magnesite is difficult to be applied to the production of magnesium refractory raw materials.
TABLE 1 industry standard magnesite chemical composition requirement
Magnesite resources are not renewable, and the mining method of poor mining and excellent mining ensures that the better the quality resources are, the less the mining is. Therefore, the resource protection problem must be re-recognized and highly appreciated. On one hand, the method improves the MgO content in the low-grade magnesite by a mineral processing technology, reduces the impurity content, fully and reasonably utilizes the existing magnesite resources, and purifies the magnesite by an advanced mineral separation process; on the other hand, the development of the application technology of the low-grade magnesite tailings is urgent.
The large lining for protecting the converter is the most widely applied refractory material for protecting the converter, and the service life of the material directly influences the effect of protecting the converter and the age of the converter.
The application principle of the large shell fabric of the converter is that magnesia particles and a carbonaceous material which softens and melts at high temperature undergo an interface reaction process, and in the action process, the carbonaceous material is carbonized and sintered to form a carbon skeleton, the magnesia particles are solidified together to resist corrosion of molten steel, and in order to ensure that the formed magnesia-carbon sintered body has high strength and uniform structure, a fluidization agent is added to reduce the surface tension of the magnesia particles, so that the magnesia particles are fully sintered. The large shell fabric of the converter is generally composed of main raw materials of magnesia, a carbon source and a fluidizer, wherein the main raw materials of magnesia generally adopt dead burned magnesia, medium-grade magnesia or high-purity magnesia according to the use requirement, and the proportion of the main raw materials of magnesia accounts for about 85 percent of the large shell fabric of the converter, and the large shell fabric of the converter is estimated to be only one type, and various magnesia is consumed in China for about 10 ten thousand tons each year.
Therefore, the development of a new technology for producing large-scale fabrics of the converter, which uses magnesite tailing powder to partially replace magnesia and meets the smelting requirement of the converter, is urgent in combination with the fact that low-grade magnesite tailings are accumulated in a large quantity and are not available.
Disclosure of Invention
The invention aims to provide a large revolving furnace shell fabric produced by using magnesite tailing powder and a preparation method thereof, which can effectively meet the requirement of steel mill users on the usability of the large revolving furnace shell fabric, reduce the consumption of magnesite and realize the scientific development view of green low-carbon sustainable development of magnesite resources.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the large revolving furnace shell fabric produced by using magnesite tailing powder is prepared from the following raw materials in parts by weight: 57-80 parts of sintered magnesia, 15-25 parts of magnesite tailing balls, 12-20 parts of composite carbon source composed of petroleum asphalt and coal tar asphalt, 2.5-4.5 parts of fluidizer composed of refined naphthalene and or p-tert-butylphenol, and composite sintering toughening agent composed of silicon carbide micro powder, basic magnesium sulfate whisker and iron powder: 0.2 to 2.0 parts of composite antioxidant consisting of metal aluminum powder and metal silicon powder: 2.0 to 5.5 portions.
The magnesite tailing balls are round balls formed by shaking low-grade magnesite tailing powder with the magnesium oxide content of 33% -44% through a disc pelletizer.
Petroleum asphalt in the composite carbon source: coal tar pitch= (0-3) to 1, wherein petroleum pitch is not zero.
Refined naphthalene in the fluidizing agent: the p-tert-butylphenol= (0-1) and (0-1), the refined naphthalene and the p-tert-butylphenol are particles smaller than 3mm, and the refined naphthalene and the p-tert-butylphenol are not zero at the same time.
Silicon carbide micropowder in the composite sintering toughening agent: basic magnesium sulfate whisker: iron powder=1:0 to 0.3: (0-1), wherein the granularity of the silicon carbide micro powder is smaller than 20 microns, the basic magnesium sulfate whisker is fine powder with the diameter D smaller than 1.0 micron, the length L is 10-60 microns, the length-diameter ratio L/D is larger than 30, the surface is treated by a composite coupling agent (the composite coupling agent is used by compositing a plurality of coupling agents together), the iron powder is fine powder with the granularity smaller than 0.088mm, and the basic magnesium sulfate whisker and the iron powder are not zero.
The composite antioxidant comprises metal aluminum powder and metal silicon powder which are respectively mixed according to the ratio of 1:0.3-0.6, wherein the granularity of the metal aluminum powder is less than or equal to 200 meshes of fine powder, and the granularity of the metal silicon powder is less than or equal to 200 meshes of fine powder.
20-30 parts of coarse particles with the diameter of less than or equal to 5mm and more than or equal to 3mm, 15-20 parts of coarse particles with the diameter of less than or equal to 3mm and more than or equal to 1mm, 15-20 parts of fine powder particles with the diameter of less than or equal to 0.088mm and 7-10 parts of fine powder particles with the diameter of less than or equal to 0.088mm in the sintered magnesite.
A preparation method of a converter large fabric produced by using magnesite tailing powder comprises the following specific steps:
1) Preparing magnesite tailing balls: the raw materials comprise 92-96 parts of low-grade magnesite tailing powder, 2-5 parts of alkaline pellet binder, 0.5-1.5 parts of hardener, 1-3 parts of sodium bentonite and 4-6 parts of additional purified water; before production, firstly uniformly mixing four dry materials at one time, putting the mixed dry materials into a disc pelletizer, continuously adding water, sieving the produced pellets during discharging, wherein the diameter of the pellets is 10-25mm, namely magnesite tailing pellets meeting the requirements, naturally airing or kiln drying, and detecting that the water content is less than 0.2%, thus obtaining finished magnesite tailing pellets;
2) Preparing a large revolving furnace shell fabric: premixing sintered magnesia, finished magnesite tailing balls, a composite carbon source, a fluidizer, a composite sintering toughening agent and a composite antioxidant for 6-12 minutes.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, low-grade magnesite tailings are introduced into the large shell fabric of the converter for the first time to replace magnesia, thereby saving magnesite resources, reducing energy consumption, and on the basis of further researching the principle of slag splashing and furnace protection of the converter, the contents of magnesium oxide and calcium oxide in a steel slag system are increased by introducing part of low-grade magnesite tailings, according to preliminary statistics, when the content of the magnesium oxide and calcium oxide exceeds 10%, the alkalinity of the slag system is generally more than 3, the slag system becomes viscous, the viscosity is increased, the slag splashing and furnace protection effect of the large shell fabric of the converter is further improved, the service life is prolonged by 15-25%, and the cost is reduced by 10-20%.
2) Aiming at the actual situation that the fluidity is deteriorated when the small-granularity magnesite tailing powder is directly added into the large shell fabric of the converter, the small-granularity magnesite tailing powder is pre-shaken into the balls with the diameter of 10-25mm by a pelletizing process and then added into the large shell fabric of the converter, so that the addition of the magnesite tailing powder into the large shell fabric of the converter is realized, and the fluidity of the large shell fabric of the converter is improved to a certain extent.
3) The invention uses basic magnesium sulfate whisker to improve the excellent characteristics of impact strength, elastic modulus, hardness and tensile strength of ceramic materials, resin and other materials, determines the reasonable addition of the material in the magnesium-carbon converter large fabric on the basis of a large number of tests, and introduces the basic magnesium sulfate whisker into the converter large fabric for the first time, thereby realizing the effect of reinforcing and toughening. Compared with the non-added basic magnesium sulfate whisker added converter large shell fabric, the basic magnesium sulfate whisker added converter large shell fabric has the advantages that the medium-temperature strength and pressure resistance at 1100 ℃ for 3 hours are improved by 28%, and the high-temperature strength and pressure resistance at 1500 ℃ for 1 hour are improved by 21%, so that the basic magnesium sulfate whisker added converter large shell fabric is an important reason for prolonging the service life of the basic magnesium sulfate whisker added converter large shell fabric. The basic magnesium sulfate whisker adopted by the invention is produced by Jiangsu Changzhou, the diameter D is less than 1.0 micron, the length L is 10-60 microns, the length-diameter ratio L/D is more than 30, and the surface is treated by a composite coupling agent.
Drawings
FIG. 1 is a flow chart of a production process of a converter large shell fabric produced by using magnesite tailing powder.
Detailed Description
The following is a further description of embodiments of the invention, with reference to examples:
the large revolving furnace shell fabric produced by using magnesite tailing powder is prepared from the following raw materials in parts by weight: 57-80 parts of sintered magnesia, 15-25 parts of magnesite tailing balls, 12-20 parts of composite carbon source composed of petroleum asphalt and coal tar asphalt, 2.5-4.5 parts of fluidizer composed of refined naphthalene and or p-tert-butylphenol, and composite sintering toughening agent composed of silicon carbide micro powder, basic magnesium sulfate whisker and iron powder: 0.2 to 2.0 parts of composite antioxidant consisting of metal aluminum powder and metal silicon powder: 2.0 to 5.5 portions.
The magnesite tailing balls are round balls formed by shaking low-grade magnesite tailing powder with the magnesium oxide content of 33% -44% through a disc balling machine, the round balls with the granularity of 10-25mm are magnesite tailing balls meeting the requirements, and the proportion of balls with the diameter of more than 25mm or less than 10mm in the magnesite tailing balls is required to be less than 5%.
Petroleum asphalt in the composite carbon source: coal tar pitch= (0-3) to 1, the modified asphalt carbon black is low softening point modified asphalt small particle with particle less than 3mm (softening point less than 120 ℃), wherein petroleum pitch is not zero.
Refined naphthalene in the fluidizing agent: the p-tert-butylphenol= (0-1) and (0-1), the refined naphthalene and the p-tert-butylphenol are particles smaller than 3mm, and the refined naphthalene and the p-tert-butylphenol are not zero at the same time.
Silicon carbide micropowder in the composite sintering toughening agent: basic magnesium sulfate whisker: iron powder=1:0 to 0.3: (0-1), wherein the granularity of the silicon carbide micro powder is smaller than 20 microns, the basic magnesium sulfate whisker is fine powder with the diameter D smaller than 1.0 micron, the length L between 10 and 60 microns and the length-diameter ratio L/D larger than 30, the surface is treated by a composite coupling agent, and the iron powder is fine powder with the granularity smaller than 0.088mm, wherein the basic magnesium sulfate whisker and the iron powder are not zero.
In the composite antioxidant, the granularity of the metal aluminum powder is less than or equal to 200 meshes, and the granularity of the metal silicon powder is less than or equal to 200 meshes, wherein the metal aluminum powder and the metal silicon powder are respectively 1:0.3-0.6.
20-30 parts of coarse particles with the diameter of less than or equal to 5mm and more than or equal to 3mm, 15-20 parts of coarse particles with the diameter of less than or equal to 3mm and more than or equal to 1mm, 15-20 parts of fine powder particles with the diameter of less than or equal to 0.088mm and 7-10 parts of fine powder particles with the diameter of less than or equal to 0.088mm in the sintered magnesite.
The preparation method of the large revolving furnace shell fabric produced by using the magnesite tailing powder comprises two stages of disc balling of the magnesite tailing powder and production of the large revolving furnace shell fabric, wherein a production process flow chart is shown in figure 1, and the specific method comprises the following steps:
1) Preparing magnesite tailing balls: the raw materials comprise 92-96 parts of low-grade magnesite tailing powder, 2-5 parts of alkaline pellet binder, 0.5-1.5 parts of hardener, 1-3 parts of sodium bentonite and 4-6 parts of additional purified water; the disc balling machine selects a balling disc with the diameter of 3-6 meters according to the yield requirement, four dry materials are uniformly mixed at one time before production, a forced mixer is selected as mixing equipment, the materials are mixed for 3-7 minutes, the materials are discharged and bagged, then the balling disc is adjusted to a proper angle and rotating speed, the mixed dry materials are placed into the disc balling machine, water is uniformly and continuously added through a water adding device, and the water adding quantity and speed are reasonably controlled according to the balling speed. The manufactured pellets are subjected to multi-layer screening during discharging, wherein the diameter of the pellets is 10-25mm, the pellets are magnesite tailing pellets meeting the requirements, and the pellets are dried naturally or put into a kiln for drying, and the water content is detected to be less than 0.2%, so that finished magnesite tailing pellets are obtained; four material related parameters are shown in table 2.
Table 2 parameters relating to the raw materials for producing the magnesite tailing balls
2) Preparing a large revolving furnace shell fabric: premixing sintered magnesia, finished magnesite tailing balls, a composite carbon source, a fluidizer, a composite sintering toughening agent and a composite antioxidant in a planetary mixer for 6-12 minutes; and after the mixed materials are discharged, weighing, bagging, batch editing and detecting can be performed, and after the mixed materials are qualified, the mixed materials can be put in storage for waiting.
At present, the converter is mainly protected by slag splashing and is assisted by a large lining of the converter. The slag splashing furnace protection generally adopts metallurgical lime, dolomite, light burned magnesia balls, magnesite and the like, realizes proper alkalinity and viscosity by adjusting the components of the steel slag, and then splashes the adjusted steel slag by an oxygen lance and adheres to all parts of the bottom, a molten pool, a furnace body and the like of the converter, thereby realizing the purpose of protecting the furnace.
The particle size standard of the low-grade magnesite tailing powder is generally smaller than 40mm, the tailing powder of most manufacturers is smaller than 1mm and occupies larger part, and the tailing powder directly replaces magnesia to be added into the tundish magnesia dry material, so that the fluidity of the dry material is seriously affected, and the usability of the dry material is finally affected.
According to the invention, on the basis of experiments on a large number of magnesite tailing materials with different tastes and different addition amounts, the optimal balance point between the temperature drop and alkalinity of molten steel and the reaction speed of the large fabric is found, so that win-win effect between the use quality and the cost of the large fabric of the converter is realized. Meanwhile, aiming at the practical problem that the fluidity is affected by directly adding the low-grade magnesite tailing powder into the large shell fabric, the low-grade magnesite tailing powder is processed into balls with the diameter of 10-25mm in a pelletizing mode, so that the large shell fabric of the converter has excellent fluidity.
Example 1:
taking a converter large shell fabric for protecting a 100-ton converter in a certain steelworks as an example. The conditions are shown in Table 3:
TABLE 3 example 1 production conditions in a 100 ton converter for a steelworks
In order to achieve the purpose, the large fabric of the converter can be achieved through the following technical scheme:
the invention relates to a novel converter large fabric produced by using magnesite tailing powder, which is prepared from the following raw materials in parts by weight: 63 parts of sintered magnesia, 20 parts of magnesite tailing balls, 12 parts of composite carbon source, 2.5 parts of fluidizer, 0.5 part of composite sintering toughening agent and composite antioxidant: 2.0 parts.
Sintered magnesia: 25 parts of coarse particles with the diameter of less than or equal to 5mm and more than or equal to 3mm, 15 parts of coarse particles with the diameter of less than or equal to 3mm and more than or equal to 1mm, 15 parts of fine powder particles with the diameter of less than or equal to 0.088mm and 8 parts of fine powder particles with the diameter of less than or equal to 0.088 mm.
The magnesite tailing balls are formed by shaking low-grade magnesite tailing powder with the magnesium oxide content of 44% in a special disc pelletizer for the pellets, and are round balls with the granularity of 10-25mm, wherein the diameter of the balls is more than 25mm, or the ratio of the balls with the diameter of less than 10mm is less than 5%.
Petroleum asphalt in the composite carbon source: coal tar pitch = 0.5:1, the modified asphalt carbon black being a low softening point modified asphalt with particles less than 3 mm.
Refined naphthalene in the fluidizing agent: p-tert-butylphenol=1:0, the refined naphthalene being particles smaller than 3 mm.
Silicon carbide micropowder in the composite sintering toughening agent: basic magnesium sulfate whisker: iron powder = 1:0.3: 0.5, the granularity of the silicon carbide micro powder is less than 20 microns, the basic magnesium sulfate whisker has the diameter D less than 1.0 micron, the length L between 10 and 60 microns and the length-diameter ratio L/D more than 30, the surface is treated by the composite coupling agent, and the iron powder is fine powder less than 0.088 mm.
The granularity of the metal aluminum powder is less than or equal to 200 meshes, and the granularity of the metal silicon powder is less than or equal to 200 meshes.
The production method for producing the converter large shell fabric by using the magnesite tailing powder comprises two stages of disc balling of the magnesite tailing powder and production of the converter large shell fabric, and comprises the following specific steps:
1) Preparing magnesite tailing balls: 95 parts of low-grade magnesite tailing powder, 2 parts of alkaline pellet binder, 0.5 part of hardener, 2.5 parts of sodium bentonite and 6 parts of purified water. The pellet disc pelletizer can select a pelletizing disc with the diameter of 4 meters according to the yield requirement. Before production, four dry materials are uniformly mixed at one time, a 1000-type forced mixer is selected as mixing equipment, the mixture is subjected to clean mixing for 5 minutes, discharging and bagging are carried out, then a balling disc is adjusted to a proper angle and a proper rotating speed, the mixed dry materials are placed into the balling disc, water is uniformly and continuously added through a water adding device, and the water adding quantity and speed are reasonably controlled according to the speed of balling. And (3) screening the manufactured pellets in multiple layers during discharging, wherein the magnesite tailing pellets with the diameter of 10-25mm meeting the requirements are naturally dried or put into a kiln for drying, and the water content is detected to be less than 0.2%, thus obtaining the finished magnesite tailing pellets. Four material related parameters are shown in table 4.
Table 4 example 1 magnesite tailing ball manufacturing raw material related parameters
2) Premixing sintered magnesia, finished magnesite tailing balls, a composite carbon source, a fluidizer, a composite sintering toughening agent and a composite antioxidant in a 2000-type planetary mixer for 8 minutes;
3) And after the mixed materials are discharged, weighing, bagging, batch editing and detecting can be performed, and after the mixed materials are qualified, the mixed materials can be put in storage for waiting.
The application effect is as follows:
the original converter large shell fabric of the steel mill can not basically see the residue of the last furnace repairing large shell fabric after 25 furnaces are smelted, and the best effect is that the furnace is protected again when 30 furnaces are smelted, and the residue area of the original large shell fabric is less than 10 percent.
After the novel large shell fabric of the converter produced by using the magnesite tailing powder is applied, the cost of the large shell fabric is reduced by 15.6%, and after 30 furnaces are smelted in each furnace protection, 10-30% of the large shell fabric in the furnace can be seen, so that the smelting needs of users are completely met.
Example 2:
taking a converter large shell fabric for 240 ton converter protection in a certain steelworks as an example. The conditions are shown in Table 5:
TABLE 5 example 2 production conditions in 240 ton converter for certain steelworks
| 1 | Nominal capacity | 240t |
| 2 | Ratio of furnace volume | 1.0m 3 /t。 |
| 3 | Average tapping amount | 235t |
| 4 | Maximum tapping amount | 245t |
| 5 | Average smelting cycle | 45min, wherein pure oxygen blowing time: 15min |
| 6 | Blowing mode | Top and bottom combined blowing |
| 7 | Tapping temperature | 1630～1690℃ |
| 8 | Final slag basicity | 2.8～4.0 |
| 9 | Age of furnace | 10000 furnaces |
| 10 | Tapping time | 4.5～8min |
In order to achieve the purpose, the large lining of the converter for protecting the converter can be achieved through the following technical scheme:
the invention relates to a novel converter large fabric produced by using magnesite tailing powder, which is prepared from the following raw materials in parts by weight: sintering magnesite: 60 parts of magnesite tailing balls: 18 parts of a composite carbon source: 14 parts of a fluidizing agent: 3 parts of composite sintering toughening agent: 1.5 parts of a compound antioxidant: 3.5 parts.
20 parts of coarse particles with the diameter of less than or equal to 5mm and more than or equal to 3mm, 15 parts of coarse particles with the diameter of less than or equal to 3mm and more than or equal to 1mm, 15 parts of fine powder particles with the diameter of less than or equal to 0.088mm and 10 parts of fine powder particles with the diameter of less than or equal to 0.088mm in the sintered magnesia.
The magnesite tailing balls are prepared by shaking low-grade magnesite tailing powder with the magnesium oxide content of 41% in a special disc pelletizer for the pellets, and are round balls with the granularity of 10-25mm, wherein the diameter of the balls is more than 25mm, or the ratio of the balls with the diameter of less than 10mm is less than 5%.
Petroleum asphalt in the composite carbon source: coal tar pitch=0.3:1, and the modified asphalt carbon black is a low softening point modified asphalt with particles smaller than 3 mm.
Refined naphthalene in the fluidizing agent: p-tert-butylphenol=0:1, p-tert-butylphenol being particles smaller than 3 mm.
Silicon carbide micropowder in the composite sintering toughening agent: basic magnesium sulfate whisker: iron powder = 1:0.3: 0.8, the granularity of the silicon carbide micro powder is less than 20 microns, the basic magnesium sulfate whisker is fine powder with the diameter D less than 1.0 micron, the length L between 10 and 60 microns and the length-diameter ratio L/D more than 30, the surface is treated by a composite coupling agent, and the iron powder is less than 0.088 mm.
In the composite antioxidant, the granularity of the metal aluminum powder and the granularity of the metal silicon powder are less than or equal to 200 meshes and less than or equal to 200 meshes, respectively, wherein the ratio of the metal aluminum powder to the metal silicon powder is=1:0.5.
The production method for producing the converter large shell fabric by using the magnesite tailing powder comprises two stages of disc balling of the magnesite tailing powder and production of the converter large shell fabric, and comprises the following specific steps:
1) Preparing magnesite tailing balls: 94 parts of low-grade magnesite tailing powder, 2.5 parts of alkaline pellet binder, 0.6 part of hardener, 2.9 parts of sodium bentonite and 6 parts of purified water. The pellet disc pelletizer can select a pelleting disc with the diameter of 3.5 meters according to the yield requirement. Before production, four dry materials are uniformly mixed at one time, a 750-type forced mixer is selected as mixing equipment, the mixture is subjected to clean mixing for 6 minutes, the materials are discharged and bagged, then a balling disc is adjusted to a proper angle and a proper rotating speed, the mixed dry materials are placed into the balling disc, water is uniformly and continuously added through a water adding device, and the water adding quantity and speed are reasonably controlled according to the speed of balling. And (3) screening the manufactured pellets in multiple layers during discharging, wherein the magnesite tailing pellets with the diameter of 10-25mm meeting the requirements are naturally dried or put into a kiln for drying, and the water content is detected to be less than 0.2%, thus obtaining the finished magnesite tailing pellets. Four material related parameters are shown in table 6.
Table 6 example 2 parameters relating to raw materials for making magnesite tailing balls
2) Premixing sintered magnesia, finished magnesite tailing balls, a composite carbon source, a fluidizer, a composite sintering toughening agent and a composite antioxidant in a 1500-type planetary mixer for 10 minutes;
3) And after the mixed materials are discharged, weighing, bagging, batch editing and detecting can be performed, and after the mixed materials are qualified, the mixed materials can be put in storage for waiting.
The application effect is as follows:
the service life of the original converter large shell fabric of the steel mill is 20 furnaces, and after 20 furnaces are smelted, the residue of the last furnace repairing large shell fabric is basically not seen.
After the novel large shell fabric of the converter produced by using the magnesite tailing powder is applied, the cost of the large shell fabric is reduced by 13.7%, the service life is prolonged to 24 furnaces, and after 324 furnaces are smelted each time, 10-20% of the large shell fabric in the furnaces can be seen, so that the smelting needs of users are completely met.
Claims (7)
1. The large revolving furnace shell fabric produced by using the magnesite tailing powder is characterized by being prepared from the following raw materials in parts by weight: 57-80 parts of sintered magnesia, 15-25 parts of magnesite tailing balls, 12-20 parts of composite carbon source composed of petroleum asphalt and coal tar asphalt, 2.5-4.5 parts of fluidizer composed of refined naphthalene and or p-tert-butylphenol, and composite sintering toughening agent composed of silicon carbide micro powder, basic magnesium sulfate whisker and iron powder: 0.2 to 2.0 parts of composite antioxidant consisting of metal aluminum powder and metal silicon powder: 2.0 to 5.5 portions;
the magnesite tailing balls are round balls formed by shaking low-grade magnesite tailing powder with the magnesium oxide content of 33% -44% through a disc pelletizer.
2. The converter macro-shell fabric produced by using magnesite tailing powder according to claim 1, wherein the petroleum asphalt in the composite carbon source is: coal tar pitch= (0-3) to 1, wherein petroleum pitch is not zero.
3. The converter macro-facer produced from magnesite tailing powder of claim 1, wherein refined naphthalene in the fluidizer: p-tert-butylphenol= (0-1) and (0-1), and the refined naphthalene and the p-tert-butylphenol are not zero at the same time.
4. The converter large face fabric produced by using magnesite tailing powder according to claim 1, wherein the composite sintering toughening agent is silicon carbide micro powder: basic magnesium sulfate whisker: iron powder=1:0 to 0.3: (0-1), wherein the granularity of the silicon carbide micro powder is smaller than 20 microns, the basic magnesium sulfate whisker has the diameter D smaller than 1.0 microns, the length L between 10 and 60 microns and the length-diameter ratio L/D larger than 30; the iron powder is fine powder smaller than 0.088mm, wherein basic magnesium sulfate whisker and the iron powder are not zero.
5. The large revolving furnace shell fabric produced by using magnesite tailing powder according to claim 1, wherein the composite antioxidant comprises metal aluminum powder and metal silicon powder which are respectively 1:0.3-0.6, the granularity of the metal aluminum powder is less than or equal to 200 meshes, and the granularity of the metal silicon powder is less than or equal to 200 meshes.
6. The large converter face fabric produced by using magnesite tailing powder according to claim 1, wherein the sintered magnesite is characterized in that 20-30 parts of coarse grains with the diameter of less than or equal to 5mm and more than or equal to 3mm, 15-20 parts of coarse grains with the diameter of less than or equal to 3mm and more than or equal to 1mm, 15-20 parts of fine grains with the diameter of less than or equal to 0.088mm and 7-10 parts of fine grains with the diameter of less than or equal to 0.088mm are contained in the sintered magnesite.
7. A method for preparing a large revolving furnace shell fabric produced by using magnesite tailing powder as set forth in any one of claims 1 to 6, which comprises the following specific steps:
1) Preparing magnesite tailing balls: the raw materials comprise 92-96 parts of low-grade magnesite tailing powder, 2-5 parts of alkaline pellet binder, 0.5-1.5 parts of hardener, 1-3 parts of sodium bentonite and 4-6 parts of additional purified water; before production, firstly uniformly mixing four dry materials at one time, putting the mixed dry materials into a disc pelletizer, continuously adding water, sieving the produced pellets during discharging, wherein the diameter of the pellets is 10-25mm, namely magnesite tailing pellets meeting the requirements, naturally airing or kiln drying, and detecting that the water content is less than 0.2%, thus obtaining finished magnesite tailing pellets;
2) Preparing a large revolving furnace shell fabric: premixing sintered magnesia, finished magnesite tailing balls, a composite carbon source, a fluidizer, a composite sintering toughening agent and a composite antioxidant for 6-12 minutes.
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