CN114477800B - Preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light-burned magnesia by one-step method - Google Patents
Preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light-burned magnesia by one-step method Download PDFInfo
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- CN114477800B CN114477800B CN202210203819.2A CN202210203819A CN114477800B CN 114477800 B CN114477800 B CN 114477800B CN 202210203819 A CN202210203819 A CN 202210203819A CN 114477800 B CN114477800 B CN 114477800B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
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- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- 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
- 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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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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Abstract
The invention relates to the technical field of fused magnesia production, in particular to a preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by a one-step method. Selecting magnesite ore with the magnesia content of more than 45wt% and the granularity of 30-80 mm after grinding as a raw material; smelting in an electric arc furnace: adding the magnesite raw material into a closed double-body electro-fused magnesium smelting furnace, and continuously electrifying and smelting for 7-10 hours at 3000-3500 ℃; after smelting is finished, starting a hot air circulation temperature control system of the closed double-body electric smelting magnesium smelting furnace, carrying out heat preservation, cooling and crystallization, and carrying out graded crushing and screening to obtain large-crystal electric smelting magnesia, electric smelting magnesia and light-burned magnesia. The invention greatly saves energy consumption and operation cost, and the obtained macrocrystalline fused magnesia has the magnesia content of more than 98.5wt% and the crystal lattice size of more than 5000 mu m; more than 98 percent of fused magnesia and more than 500 microns of lattice size; the ignition decrement of the light-burned magnesia is below 20 percent, and different product specifications can be widely applied to different fields of aerospace, electronics, steel, metallurgy and the like.
Description
Technical Field
The invention relates to the technical field of fused magnesia production, in particular to a preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by a one-step method.
Background
The large-crystal fused magnesia belongs to high-end products in the field of refractory materials, the high-temperature fire resistance and corrosion resistance are the best, the traditional production process is a two-step method for producing the large-crystal fused magnesia, namely, the first step directly adopts natural magnesite ore raw materials to produce light-burned magnesia powder, then the light-burned magnesia powder is subjected to crushing and screening to produce the large-crystal fused magnesia by smelting in an electric arc furnace, and the smelting method has the main defects that: (1) The two-step production process is complex, secondary energy consumption exists, two times of processing are performed, energy consumption waste is serious, and the operation cost is high. (2) The electric arc furnace for producing large-crystal fused magnesia by the traditional two methods adopts a single furnace design, only the current is continuously increased, the capacitance temperature time is prolonged, the heat preservation time is prolonged, the electric energy waste is serious, and the energy consumption is large.
The traditional large-crystal fused magnesia production equipment adopts an open single furnace, can only produce one product, can produce carbon dioxide and dust to pollute the environment after long-time smelting, is easy to cause the phenomenon of furnace spraying and decoration due to improper operation, and is easy to cause safety accidents.
Disclosure of Invention
The invention aims to solve the problem of providing a preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light burned magnesia (three products in one furnace) by a one-step method, and mainly solves the defects of high energy consumption, high pollution, complex process and the like of macrocrystalline fused magnesia produced by a traditional two-step method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light burned magnesia by a one-step method utilizes a closed two-body fused magnesia smelting furnace and combines a macrocrystalline fused magnesia production process to simultaneously produce common fused magnesia and light burned magnesia; the closed double-body electro-fused magnesium smelting furnace has the following structure: the furnace body is a double-body furnace heat-preserving shell and a double-body furnace grid liner combined structure, the double-body furnace grid liner is positioned on the inner side of the double-body furnace heat-preserving shell and is coaxial with the double-body furnace heat-preserving shell, a heat-preserving and heat-insulating cavity is formed between the double-body furnace grid liner and the double-body furnace heat-preserving shell, an electric smelting magnesium melting chamber is arranged in an inner cavity of the double-body furnace grid liner, a closed furnace cover is installed at the top of the double-body furnace heat-preserving shell, an electrode port and an exhaust, dust collection and discharge port are formed in the closed furnace cover, the electrode port and the exhaust, dust collection and discharge port are communicated with the inner cavity of the double-body furnace grid liner, and a hot air circulation temperature control system is installed on the outer side of the double-body furnace heat-preserving shell.
The preparation method for producing macrocrystalline fused magnesia and co-producing the fused magnesia and the light burned magnesia by the one-step method comprises the steps of magnesite ore raw material preparation and totally-enclosed magnesium double-body fused magnesia electric arc furnace smelting, and specifically comprises the following operation steps:
(1) Selecting magnesite ore with the magnesia content of more than 45wt% and the granularity of 30-80 mm after grinding as a raw material;
(2) Smelting in an electric arc furnace: adding the magnesite raw material into a closed double-body electro-fused magnesium smelting furnace, and continuously electrifying and smelting for 7-10 hours at 3000-3500 ℃; after smelting is finished, a hot air circulation temperature control system of the closed type double-body electro-fused magnesia smelting furnace is started to perform heat preservation, cooling, crystallization, graded crushing and screening to obtain large-crystal electro-fused magnesia, electro-fused magnesia and light-burned magnesia.
According to the preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method, during the smelting period, a heat circulation system in a closed double-body fused magnesia smelting furnace continuously works, and the heat circulation gradient utilization is ensured.
The preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by the one-step method comprises the following steps of (1) layering and uniformly distributing materials in a closed double-body fused magnesia smelting furnace in a smelting process: one or more than two of petroleum coke powder, cosolvent and rare earth oxide, wherein the addition amount of the petroleum coke powder is 2-10 wt% of the weight of the magnesite, the addition amount of the cosolvent is 0.1-3 wt% of the weight of the magnesite, and the addition amount of the rare earth oxide is 0.01-1 wt% of the weight of the magnesite.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method adopts petroleum coke powder as a heating agent, a melting aid and a reducing agent for layering and uniform distribution.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method has the advantages that the cosolvent is one or more than two of sodium carbonate, calcium fluoride and aluminum oxide which are uniformly distributed in a layered mode.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method is characterized in that the rare earth oxide is one or more than two of yttrium oxide, cerium oxide, samarium oxide and lanthanum oxide which are uniformly distributed in a layered manner.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method adopts a hot air circulation temperature control system to carry out intelligent temperature control on mineral aggregates in a closed double-body fused magnesia smelting furnace, slowly carries out heat preservation and cooling, carries out graded crushing and screening after cooling for 7-12 days to room temperature.
The invention has the following advantages and beneficial effects:
1. the large-crystal fused magnesia smelting equipment adopts a closed twin-body furnace design, and a hot air circulation temperature control system is arranged on an outer furnace shell, so that the large-crystal fused magnesia smelting equipment has the functions of automatically controlling heat preservation, cooling, uniform heating, forced heat extraction, energy cascade utilization and coproduction of common fused magnesia, light burned magnesia powder and the like.
2. The invention adopts petroleum coke powder as a heating assistant and a reducing agent, can improve the smelting temperature, reduce the power consumption and improve the purity of large-crystal fused magnesia.
3. The invention directly adopts magnesite ore with the granularity of 30 mm-80 mm as raw material to produce large-crystal fused magnesia by one step, co-produce common fused magnesia and light-burned magnesia powder, greatly reduces energy consumption, reduces operation cost and improves market competitiveness of products.
4. The inner container of the closed double-body furnace is designed to adopt a grid structure, so that the outer overflow of radiant heat is facilitated, and the double-circulation echelon utilization function of heat energy is realized.
5. The invention improves the output and quality of products with different specifications by layering material distribution, greatly saves energy consumption and operation cost, and obtains the following products: the content of magnesium oxide in the large-crystal fused magnesia is more than 98.5wt%, and the size of crystal lattice is more than 5000 mu m; the content of magnesium oxide in the fused magnesia is more than 98 percent, and the size of crystal lattice is more than 500 micrometers; the ignition loss of the light-burned magnesia is less than 20 percent.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the following briefly describes the embodiments and the drawings that need to be used in the description of the prior art.
FIG. 1 is a schematic view of a sealed two-body electrofused magnesium melting furnace according to the present invention.
The reference numbers in fig. 1 denote: 1 electrode port; 2, an exhaust, dust collection and feed opening; 3, closing the furnace cover; 4, a grid inner container of the double-body furnace; 5, a hot air circulation temperature control system; 6 double-body furnace heat preservation shell.
Detailed Description
As shown in figure 1, the closed type double-body electric smelting magnesium smelting furnace has a furnace body of a combined structure of a double-body furnace heat preservation shell 6 and a double-body furnace grid inner container 4, wherein the double-body furnace grid inner container 4 is positioned on the inner side of the double-body furnace heat preservation shell 6 and is coaxial with the double-body furnace heat preservation shell 6, a heat preservation and heat insulation cavity is formed between the double-body furnace grid inner container 4 and the double-body furnace heat preservation shell 6, an electric smelting magnesium smelting chamber is arranged in the inner cavity of the double-body furnace grid inner container 4, a closed furnace cover 3 is installed at the top of the double-body furnace heat preservation shell 6, an electrode port 1 and an exhaust, dust collection and feed port 2 are formed in the closed furnace cover 3, and the electrode port 1 and the exhaust, dust collection and feed port 2 are communicated with the inner cavity of the double-body furnace grid inner container 4. And a hot air circulation temperature control system 5 is arranged on the outer side of the double-body furnace heat-preserving shell 6.
The double-body furnace heat-insulating shell 6 is formed by compounding refractory heat-insulating bricks and steel plates, and the hot air circulation temperature control system 5 is additionally arranged, so that the double-body furnace heat-insulating shell has the functions of preventing heat energy from being dissipated, forcibly taking heat, utilizing waste heat in a gradient manner and the like. The grid inner container 4 of the double-body furnace is designed to adopt a grid structure, so that the radiant heat can overflow outwards, the double-circulation echelon utilization function of the heat energy is realized, and the furnace temperature can be effectively controlled.
The technical solution of the present invention is further illustrated by the following examples:
example 1
In this embodiment, the preparation method for producing macrocrystalline fused magnesia with co-production of fused magnesia and light-burned magnesia by one-step method is as follows:
magnesite ore with the specification of M47C (47 wt percent of magnesium oxide) and the granularity of 30 mm-80 mm is selected as raw material 30 tons (T) and placed in a double-body furnace grid liner 4 shown in figure 1, and power is continuously supplied for 8 hours at 3200 ℃.
In the smelting process, high-purity petroleum coke powder (with the sulfur content less than 0.1wt% and the carbon content more than 99 wt%) is uniformly distributed in layers and fully combusted at 1T. During smelting, a heat cycle system in the closed double-body electric melting magnesium smelting furnace continuously works to ensure the heat cycle gradient utilization. After the smelting is finished, the hot air circulation temperature control system 5 of fig. 1 is started to perform heat preservation and slow cooling crystallization for 9 days to room temperature, and then the large-crystal fused magnesia, the fused magnesia and the light-burned magnesia are obtained through grading crushing and screening. Wherein: the lattice size of the macrocrystalline fused magnesia is 5800 mu m, and the lattice size of the fused magnesia is 560 mu m.
Example 2
In this embodiment, the preparation method for producing macrocrystalline fused magnesia with co-production of fused magnesia and light-burned magnesia by one-step method is as follows:
magnesite ore with the specification of M46C (46 wt percent of magnesium oxide) and the granularity of 30 mm-80 mm is selected as a raw material 30T and is placed in a double-body furnace grid liner 4 shown in figure 1, and power is continuously supplied for 8 hours at 3200 ℃.
In the smelting process, high-purity petroleum coke powder (with the sulfur content less than 0.1wt% and the carbon content more than 99 wt%) is uniformly distributed in layers and fully combusted at 1T.
In the smelting process, sodium carbonate is uniformly distributed in layers for 0.1T.
In the smelting process, 0.01T of yttrium oxide is uniformly distributed in a layered mode.
During smelting, a heat circulation system in the closed double-body electric melting magnesium smelting furnace continuously works to ensure the heat circulation gradient utilization; after the smelting is finished, the hot air circulation temperature control system 5 of fig. 1 is started to perform heat preservation and slow cooling crystallization for 9 days to room temperature, and then the large-crystal fused magnesia, the fused magnesia and the light-burned magnesia are obtained through grading crushing and screening. Wherein: the lattice size of the macrocrystalline fused magnesia is 5400 mu m, and the lattice size of the fused magnesia is 520 mu m.
Example 3
In this embodiment, the preparation method for producing macrocrystalline fused magnesia with co-production of fused magnesia and light-burned magnesia by one-step method is as follows:
magnesite ore with the specification of M45 (magnesium oxide 45 wt%) and the granularity of 30 mm-80 mm is selected as a raw material 30T and is placed in a double-body furnace grid liner 4 shown in figure 1, and power is continuously supplied for 8 hours at 3200 ℃.
In the smelting process, high-purity petroleum coke powder (with the sulfur content less than 0.1wt% and the carbon content more than 99 wt%) is uniformly distributed in layers and fully combusted at 1T.
In the smelting process, sodium carbonate is uniformly distributed in layers for 0.1T.
In the smelting process, 0.01T of yttrium oxide is uniformly distributed in a layered mode.
In the smelting process, calcium fluoride is uniformly distributed in layers by 0.05T.
During the smelting period, a heat circulation system in the closed double-body electric smelting magnesium smelting furnace continuously works to ensure the heat circulation gradient utilization; after the smelting is finished, the hot air circulation temperature control system 5 of fig. 1 is started to perform heat preservation and slow cooling crystallization for 9 days to room temperature, and then the large-crystal fused magnesia, the fused magnesia and the light-burned magnesia are obtained through grading crushing and screening. Wherein: the size of the crystal lattice of the macrocrystalline fused magnesia is 6100 μm, and the size of the crystal lattice of the fused magnesia is 630 μm.
The samples of the above examples were taken for component detection, and the statistics of the detection results are as follows:
the embodiment results show that the invention utilizes a closed double-body fused magnesia smelting furnace, combines a large-crystal fused magnesia production process, and simultaneously produces common fused magnesia and light-burned magnesia, thereby achieving the purpose of gradient utilization of energy, greatly reducing energy consumption, reducing operation cost, improving product quality, and being widely applied to different fields of aerospace, electronics, steel, metallurgy and the like in different product specifications.
Claims (5)
1. A preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light-burned magnesia by a one-step method is characterized in that a closed two-body fused magnesia smelting furnace is combined with a macrocrystalline fused magnesia production process to simultaneously produce common fused magnesia and light-burned magnesia; the closed double-body electro-fused magnesium smelting furnace has the following structure: the furnace body is a double-body furnace heat-preservation shell and a double-body furnace grid liner combined structure, the double-body furnace grid liner is positioned on the inner side of the double-body furnace heat-preservation shell and is coaxial with the double-body furnace heat-preservation shell, a heat-preservation and heat-insulation cavity is formed between the double-body furnace grid liner and the double-body furnace heat-preservation shell, an electric smelting magnesium melting chamber is arranged in the inner cavity of the double-body furnace grid liner, a closed furnace cover is arranged at the top of the double-body furnace heat-preservation shell, an electrode port and an exhaust, dust collection and discharge port are formed in the closed furnace cover, the electrode port and the exhaust, dust collection and discharge port are communicated with the inner cavity of the double-body furnace grid liner, and a hot air circulation temperature control system is arranged on the outer side of the double-body furnace heat-preservation shell;
the method comprises the steps of magnesite raw material preparation and totally-enclosed magnesium double-body electric smelting magnesium arc furnace smelting, and the specific operation steps are as follows:
(1) Selecting magnesite ore with the magnesia content of more than 45wt% and the granularity of 30-80 mm after grinding as a raw material;
(2) Smelting in an electric arc furnace: adding the magnesite ore raw materials into a closed double-body electric smelting magnesium smelting furnace, and continuously electrifying and smelting for 7-10 hours at 3000-3500 ℃; after smelting is finished, starting a hot air circulation temperature control system of the closed double-body electric smelting magnesium smelting furnace, carrying out heat preservation, cooling and crystallization, and carrying out graded crushing and screening to obtain large-crystal electric smelting magnesia, electric smelting magnesia and light-burned magnesia;
in the smelting process, the materials are distributed in a layered and uniform manner in a closed double-body electric melting magnesium smelting furnace: petroleum coke powder or one or more than two of the petroleum coke powder, cosolvent and rare earth oxide, wherein the addition amount of the petroleum coke powder is 2 to 10 percent of the weight of the magnesite, the addition amount of the cosolvent is 0.1 to 3 percent of the weight of the magnesite, and the addition amount of the rare earth oxide is 0.01 to 1 percent of the weight of the magnesite;
the petroleum coke powder is used as a heat increasing agent, a melting assisting agent and a reducing agent for layered and uniform distribution.
2. The method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia according to the one-step method of claim 1, wherein a heat cycle system in the closed double-body fused magnesia smelting furnace continuously works during smelting to ensure the heat cycle cascade utilization.
3. The one-step method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia according to claim 1, wherein the cosolvent is one or more than two of sodium carbonate, calcium fluoride and alumina which are uniformly distributed in a layered manner.
4. The one-step process for producing large-crystal fused magnesia with co-production of fused magnesia and light-burned magnesia according to claim 1, wherein the rare earth oxide is one or more of yttrium oxide, cerium oxide, samarium oxide and lanthanum oxide, and the materials are uniformly distributed in layers.
5. The preparation method for producing large-crystal fused magnesia and coproducing fused magnesia and light-burned magnesia according to the one-step method of claim 1, which is characterized in that a hot air circulation temperature control system is adopted to carry out intelligent temperature control on mineral aggregates in a closed double-body fused magnesia smelting furnace, the temperature is slowly kept and reduced, and after the mineral aggregates are cooled for 7 to 12 days to room temperature, the mineral aggregates are subjected to graded crushing and screening.
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| CN101956083A (en) * | 2010-10-29 | 2011-01-26 | 曲智 | Process method and equipment for smelting magnesium by using magnesite with one-step method |
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| CN103864119A (en) * | 2014-03-07 | 2014-06-18 | 华东理工大学 | Additive for producing macrocrystalline fused magnesite |
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| DE102014019347A1 (en) * | 2014-12-22 | 2016-06-23 | Refratechnik Holding Gmbh | Refractory products and their use |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1994883A (en) * | 2006-12-29 | 2007-07-11 | 辽宁鑫荣矿业集团有限公司 | Electric melting method for synthesizing low silicon high calcium quality magnesia using low grade magnesite |
| CN101956083A (en) * | 2010-10-29 | 2011-01-26 | 曲智 | Process method and equipment for smelting magnesium by using magnesite with one-step method |
| CN202415611U (en) * | 2011-12-31 | 2012-09-05 | 海盐华辰工业炉有限公司 | Furnace temperature balancing device of heat treatment furnace |
| CN103864119A (en) * | 2014-03-07 | 2014-06-18 | 华东理工大学 | Additive for producing macrocrystalline fused magnesite |
| CN210741046U (en) * | 2019-10-29 | 2020-06-12 | 苏州市亚龙金属材料有限公司 | Energy-saving and efficient well-type electric furnace |
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