CN113200736A - Furnace lining of ferrovanadium smelting furnace and preparation method thereof - Google Patents
Furnace lining of ferrovanadium smelting furnace and preparation method thereof Download PDFInfo
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- CN113200736A CN113200736A CN202110424891.3A CN202110424891A CN113200736A CN 113200736 A CN113200736 A CN 113200736A CN 202110424891 A CN202110424891 A CN 202110424891A CN 113200736 A CN113200736 A CN 113200736A
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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
- 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
- C04B35/043—Refractories from grain sized mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1626—Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/449—Organic acids, e.g. EDTA, citrate, acetate, oxalate
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6583—Oxygen containing atmosphere, e.g. with changing oxygen pressures
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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
- 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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- C04B2235/77—Density
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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Abstract
The invention relates to the technical field of ferrovanadium furnace knotting, and discloses a ferrovanadium smelting furnace lining and a preparation method thereof. The method comprises the following steps: (1) mixing an inorganic binder and an organic binder to obtain a composite binder; (2) mixing the composite binder obtained in the step (1) with magnesia, and then adding water to stir to obtain a wet-beating material; (3) and injecting the wet-beating material into a mould to be knotted and molded, then removing the mould, spraying a liquid binder on the surface in contact with the mould, then airing, and then carrying out oxygen-enriched baking to obtain the vanadium-iron alloy smelting furnace lining. The method uses the novel environment-friendly chlorine-free composite binder, has the characteristics of strong adhesion capability, safety, environmental protection and high efficiency, and does not generate hydrogen chloride gas and acid mist in the baking process, so that the furnace lining is more firm and compact after wet knotting and baking, the preparation link of boiling magnesium chloride-containing brine at high temperature on site is eliminated, the smelting yield is improved, and the content of magnesium oxide in the smelting slag is reduced.
Description
Technical Field
The invention relates to the technical field of ferrovanadium furnace knotting, in particular to a ferrovanadium smelting furnace lining and a preparation method thereof.
Background
The reduction product of the ferrovanadium alloy in the smelting process is aluminum oxide, and in order to reduce the melting point and viscosity of a slag system to fully recover vanadium elements in the slag, a large amount of calcium oxide is added in the smelting process to carry out slagging. When the strength of the magnesium lining material is insufficient, the erosion and consumption at high temperature can cause the slag to contain high magnesium oxide, and simultaneously, a large amount of vanadium oxide and vanadium alloy can also penetrate into the refractory material. Therefore, improving the material of the furnace lining is one of the key points for improving the vanadium smelting yield.
Patent application 201610323085.6 discloses a knotting method of a casting ingot mold in a ferrovanadium preparation process, and belongs to the field of metallurgy. In the casting ingot mold knotting method, magnesia and magnesium fire clay with granularity interval of 0-5mm and 5-10mm are used as main knotting materials, ferrovanadium smelting corundum slag with granularity interval of 0-10mm is used as auxiliary knotting materials, the main knotting materials and the auxiliary knotting materials are mixed with brine to obtain mixed knotting materials, and then the mixed knotting materials are subjected to inner and outer layer knotting according to the proportioning requirement.
Patent application 201510474486.7 discloses a method for casting a liner of a straight tube furnace for vanadium iron alloy smelting. The pouring method comprises the following steps: and directly pouring the uniformly mixed castable into a straight-tube furnace shell, stirring the castable until the castable is compact and flat with the castable on the furnace bottom and the castable on the furnace side wall, baking after air drying, and knotting the furnace lining at the furnace bottom and the furnace side wall after cooling.
Patent application 201510514863.5 discloses a knotting method of a ferrovanadium ingot mold, which can form a compact refractory layer on the inner wall of the ingot mold, reduce the amount of ferrovanadium which is easy to permeate into the refractory layer in the process of cooling in the ingot mold, and reduce the amount of alloy permeation. The knotting method comprises the following steps: 1) knotting a refractory layer on the ferrovanadium ingot mould by adopting a knotting material; 2) after the refractory layer is knotted, coating the refractory layer on the inner wall of the ingot mold by using a knotting material until the inner wall is completely coated; 3) and baking the caking material coated on the fire-resistant layer until the caking material is dried.
Therefore, the knotting materials of the current ferrovanadium smelting furnace are mainly magnesia and magnesium chloride, a lining with certain strength is obtained by adopting a wet knotting process, and the essence of the lining is that the air hardening solidification of magnesium oxychloride cement is utilizedThe mechanism. The reaction of water with MgO is inherently slower, but when MgCl is present in the aqueous solution2If present, the Mg (OH) can be accelerated2Promote the hydration of the magnesite to make Mg (OH)2Can be formed in large quantity, thereby forming a continuous crystal skeleton structure in the refractory material and improving the strength. The brine is decocted by magnesium chloride in the production site, and is decocted for 3-4 hours at the temperature of 80 ℃. However, the baking process of the furnace lining prepared by the bittern stewing process and the knotting of the knotted material inevitably releases water vapor containing HCl gas, which is not beneficial to the health of workers and accelerates the electrochemical corrosion of steel structure devices in factories.
Disclosure of Invention
The invention aims to solve the problems of poor effect, environmental pollution, high content of magnesium oxide in smelting slag, low smelting yield and the like caused by adopting a magnesium chloride binder in the preparation process of a furnace lining in the prior art, and provides a vanadium iron alloy smelting furnace lining and a preparation method thereof.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a lining of a ferrovanadium smelting furnace, the method comprising the steps of:
(1) mixing an inorganic binder and an organic binder to obtain a composite binder;
(2) mixing the composite binder obtained in the step (1) with magnesia, and then adding water to stir to obtain a wet-beating material;
(3) injecting a wet-beating material into a mould for knotting and forming, then removing the mould, spraying a liquid binder on the surface in contact with the mould, then airing, and then carrying out oxygen-enriched baking to obtain a vanadium-iron alloy smelting furnace lining;
wherein, in the step (1), the inorganic binder is used in an amount of 70-90 wt% and the organic binder is used in an amount of 10-30 wt%, based on 100 wt% of the total weight of the inorganic binder and the organic binder;
in the step (2), the amount of the composite binder is 2-20 wt% of the total weight of the magnesite.
Preferably, in step (1), the inorganic binder is selected from at least one of hydrated alumina, colloidal alumina, magnesium citrate, and magnesium stearate.
Preferably, in step (1), the organic binder is carboxymethyl cellulose and/or pregelatinized starch.
Preferably, in the step (2), the magnesite grain contains 50-60 wt% of fine-fraction magnesite grain size less than 0.074mm, 20-30 wt% of medium-fraction magnesite grain size and 10-20 wt% of coarse-fraction magnesite grain size, wherein the grain size of the medium-fraction magnesite grain size is 0.074 mm-1.18 mm, and the grain size of the coarse-fraction magnesite grain size is 1.40 mm-2.36 mm.
Preferably, in step (2), the moisture content of the wet-laid material is 3 to 9% by weight.
Preferably, in step (3), the liquid binder is a solution containing carboxymethyl cellulose.
Preferably, the concentration of carboxymethyl cellulose in the carboxymethyl cellulose-containing solution is 5 to 8% by weight.
Preferably, in the step (3), the oxygen-enriched baking is baking by using coal gas combustion to supply heat under an oxygen-containing combustion-supporting atmosphere;
preferably, the specific process of oxygen-enriched roasting comprises the following steps: under the oxygen-containing combustion-supporting atmosphere with the oxygen content of 22-35%, under the condition that the gas flow is 600-800 Nm3Baking for 2-5h under the condition of/h, and then baking at the gas flow rate of 1200-1800 Nm3Baking for 3-10h under the condition of/h.
The invention also provides a vanadium iron alloy smelting furnace lining prepared by the method.
Preferably, the lining density of the vanadium iron alloy smelting furnace lining is 2.95-3.48g/cm3The porosity is 3-12%.
The invention provides a novel preparation method of a furnace lining of a chlorine-free knotting-oxygen-enriched baking ferrovanadium alloy smelting furnace, which uses a novel environment-friendly chlorine-free composite binder to replace the traditional magnesium chloride binder, has the characteristics of strong adhesion capability, safety, environmental protection and high efficiency, and can not generate hydrogen chloride gas and acid mist in the baking process, so that the furnace lining is firmer and more compact after being subjected to wet knotting-baking, the preparation link of decocting magnesium chloride brine at high temperature on site is eliminated, the smelting yield is improved, and the content of magnesium oxide in smelting slag is reduced. The method can be applied to the ferrovanadium smelting industry, in particular to the preparation of ferrovanadium furnace linings or liquid corundum slag container linings, and has remarkable innovativeness and practicability.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a preparation method of a vanadium iron alloy smelting furnace lining, which comprises the following steps:
(1) mixing an inorganic binder and an organic binder to obtain a composite binder;
(2) mixing the composite binder obtained in the step (1) with magnesia, and then adding water to stir to obtain a wet-beating material;
(3) injecting a wet-beating material into a mould for knotting and forming, then removing the mould, spraying a liquid binder on the surface in contact with the mould, then airing, and then carrying out oxygen-enriched baking to obtain a vanadium-iron alloy smelting furnace lining;
wherein, in the step (1), the inorganic binder is used in an amount of 70-90 wt% and the organic binder is used in an amount of 10-30 wt%, based on 100 wt% of the total weight of the inorganic binder and the organic binder;
in the step (2), the amount of the composite binder is 2-20 wt% of the total weight of the magnesite.
In the invention, the ferrovanadium smelting furnace refers to: the metallurgical reaction vessel for smelting ferrovanadium mainly comprises a steel shell, bricks and a magnesium furnace lining from outside to inside along the diameter direction.
In the invention, the environment-friendly chlorine-free binder is adopted to replace the traditional magnesium chloride binder and is matched with the magnesia with a specific proportion for use, so that the smelting yield of the furnace lining is improved, and the content of magnesium oxide in the smelting slag is reduced.
In particular embodiments, in step (2), the composite binder may be used in an amount of 2 wt%, 4 wt%, 6 wt%, 8 wt%, 10 wt%, 12 wt%, 14 wt%, 16 wt%, 18 wt%, or 20 wt% based on the total weight of the magnesite.
In a specific embodiment, in step (1), the inorganic binder may be used in an amount of 70 wt%, 75 wt%, 80 wt%, 85 wt%, or 90 wt%, and the organic binder may be used in an amount of 10 wt%, 15 wt%, 20 wt%, 25 wt%, or 30 wt%, based on 100 wt% of the total weight of the inorganic binder and the organic binder.
In a preferred embodiment, in step (1), the inorganic binder is selected from at least one of hydrated alumina, colloidal alumina, magnesium citrate, and magnesium stearate.
In a preferred embodiment, in step (1), the organic binder is carboxymethyl cellulose and/or pregelatinized starch.
In the invention, the magnesite is metallurgical-grade magnesite and/or fused magnesite.
In a preferred embodiment, in step (2), the magnesite grain mixture comprises 50-60 wt% of fine-fraction magnesite grain size less than 0.074mm, 20-30 wt% of medium-fraction magnesite grain size and 10-20 wt% of coarse-fraction magnesite grain size, wherein the medium-fraction magnesite grain size is 0.074 mm-1.18 mm, and the coarse-fraction magnesite grain size is 1.40 mm-2.36 mm.
In a preferred embodiment, in step (2), the wet-laid material has a moisture content of 3 to 9% by weight. Specifically, the moisture content of the wet-lap material may be 3 wt.%, 4 wt.%, 5 wt.%, 6 wt.%, 7 wt.%, 8 wt.%, or 9 wt.%.
In a preferred embodiment, in step (3), the liquid binder is a solution containing carboxymethyl cellulose.
Further preferably, the concentration of carboxymethyl cellulose in the carboxymethyl cellulose-containing solution is 5 to 8% by weight.
In the present invention, there is no particular requirement on the shape and size of the mold used for the lining preparation, and an appropriate mold can be selected as required.
In a preferred embodiment, in step (3), the oxygen-enriched baking is baking using gas combustion heating under an oxygen-containing combustion-supporting atmosphere.
Further preferably, the oxygen-enriched roasting comprises the following specific processes: under the oxygen-containing combustion-supporting atmosphere with the oxygen content of 22-35%, under the condition that the gas flow is 600-800 Nm3Baking for 2-5h under the condition of/h, and then baking at the gas flow rate of 1200-1800 Nm3Baking for 3-10h under the condition of/h.
In the present invention, the gas may be coke oven gas, blast furnace gas, or converter gas.
The invention also provides a vanadium iron alloy smelting furnace lining prepared by the method.
Preferably, the lining density of the vanadium iron alloy smelting furnace lining is 2.95-3.48g/cm3The porosity is 3-12%.
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
(1) Mixing an inorganic binder (hydrated alumina) and an organic binder (carboxymethyl cellulose) to obtain a composite binder; wherein, the using amount of the inorganic binder is 90 wt% and the using amount of the organic binder is 10 wt%, based on the total weight of the inorganic binder and the organic binder being 100%;
(2) mixing the composite binder obtained in the step (1) with metallurgical-grade magnesite (the magnesite is formed by mixing 50 wt% of fine-grade magnesite, 30 wt% of medium-grade magnesite and 20 wt% of coarse-grade magnesite, wherein the grain size of the fine-grade magnesite is less than 0.074mm, the grain size of the medium-grade magnesite is 0.074 mm-1.18 mm, and the grain size of the coarse-grade magnesite is 1.40 mm-2.36 mm), controlling the weight of the composite binder to be 11% of the weight of the magnesite, and then adding water for stirring to obtain a wet-beating material with the water content of 6 wt%;
(3) injecting wet beating material into a mould to form a knot, removing the mould, spraying a solution containing 5 wt% of carboxymethyl cellulose on the surface in contact with the mould, drying in the air, and baking (under an oxygen-containing combustion-supporting atmosphere with an oxygen content of 35%, under a coke oven gas flow of 800Nm3Baking for 5h at a temperature of 1200Nm in a coke oven3And/h, baking for 10h), wherein no corrosive gas containing hydrogen chloride is generated in the baking process, so as to obtain the furnace lining of the ferrovanadium smelting furnace.
Example 2
(1) Mixing an inorganic binder (the inorganic binder contains 50 converter percent of colloidal alumina, 25 converter percent of magnesium citrate and 25 converter percent of magnesium stearate) and an organic binder (pregelatinized starch) to obtain a composite binder; wherein, the using amount of the inorganic binder is 90 wt% and the using amount of the organic binder is 10 wt%, based on the total weight of the inorganic binder and the organic binder being 100%;
(2) mixing the composite binder obtained in the step (1) with electric smelting magnesite (the magnesite is formed by mixing 60 wt% of fine-grained magnesite, 20 wt% of medium-grained magnesite and 20 wt% of coarse-grained magnesite, wherein the grain size of the fine-grained magnesite is less than 0.074mm, the grain size of the medium-grained magnesite is 0.074 mm-1.18 mm, and the grain size of the coarse-grained magnesite is 1.40 mm-2.36 mm), controlling the weight of the composite binder to account for 20% of the weight of the magnesite, and then adding water for stirring to obtain a wet-forging material with the water content of 9 wt%;
(3) injecting wet material into a mold, knotting, removing the mold, spraying a solution containing 5 wt% of carboxymethyl cellulose on the surface contacting with the mold, air drying, and baking (with oxygen content of 22%Under the oxygen-containing combustion-supporting atmosphere, the flow rate of blast furnace gas is 800Nm3Baking for 2h at a temperature of 1200Nm3And/h, baking for 3h), wherein no corrosive gas containing hydrogen chloride is generated in the baking process, so as to obtain the furnace lining of the ferrovanadium smelting furnace.
Example 3
(1) Mixing an inorganic binder (magnesium citrate) and an organic binder (pregelatinized starch) to obtain a composite binder; wherein, the using amount of the inorganic binder is 80 weight percent and the using amount of the organic binder is 20 weight percent, based on the total weight of the inorganic binder and the organic binder being 100 percent;
(2) mixing the composite binder obtained in the step (1) with electric smelting magnesite (the magnesite is formed by mixing 60 wt% of fine-grained magnesite, 20 wt% of medium-grained magnesite and 20 wt% of coarse-grained magnesite, wherein the grain size of the fine-grained magnesite is less than 0.074mm, the grain size of the medium-grained magnesite is 0.074 mm-1.18 mm, and the grain size of the coarse-grained magnesite is 1.40 mm-2.36 mm), controlling the weight of the composite binder to account for 20% of the weight of the magnesite, and then adding water for stirring to obtain a wet-forging material with the water content of 9 wt%;
(3) injecting the wet beating material into a mould to be knotted and formed, then removing the mould, spraying a solution containing 5 wt% of carboxymethyl cellulose on the surface in contact with the mould, then airing, and then baking (under an oxygen-containing combustion-supporting atmosphere with oxygen content of 22%, the gas flow of a converter is 800Nm3Baking for 2h at a temperature of 1200Nm in a converter3And/h, baking for 3h), wherein no corrosive gas containing hydrogen chloride is generated in the baking process, so as to obtain the furnace lining of the ferrovanadium smelting furnace.
Example 4
(1) Mixing an inorganic binder (magnesium stearate) and an organic binder (carboxymethyl cellulose) to obtain a composite binder; wherein, the total weight of the inorganic binder and the organic binder is 100%, the use amount of the inorganic binder is 70 wt%, and the use amount of the organic binder is 30 wt%;
(2) mixing the composite binder obtained in the step (1) with electric smelting magnesite (the magnesite is formed by mixing 50 wt% of fine-grained magnesite, 30 wt% of medium-grained magnesite and 20 wt% of coarse-grained magnesite, wherein the grain size of the fine-grained magnesite is less than 0.074mm, the grain size of the medium-grained magnesite is 0.074 mm-1.18 mm, and the grain size of the coarse-grained magnesite is 1.40 mm-2.36 mm), controlling the weight of the composite binder to be 2% of the weight of the magnesite, and then adding water for stirring to obtain a wet-forging material with the water content of 9 wt%;
(3) injecting wet beating material into a mould, knotting and forming, removing the mould, spraying a solution containing 8 wt% of carboxymethyl cellulose on the surface contacting with the mould, air drying, and baking (under oxygen-containing combustion-supporting atmosphere with oxygen content of 22%, coke oven gas flow rate of 800Nm3Baking for 2h at a temperature of 1200Nm in a coke oven3And/h, baking for 3h), wherein no corrosive gas containing hydrogen chloride is generated in the baking process, so as to obtain the furnace lining of the ferrovanadium smelting furnace.
Comparative example 1
The preparation method of the traditional furnace lining by using magnesium chloride as a binder comprises the following steps: firstly, preparing raw materials required by brine boiling, adding magnesium chloride into tap water, heating to about 80 ℃ at high temperature, boiling for 4 hours to obtain brine, then pouring the brine into magnesia for knotting, mixing uniformly, and obtaining the ferrovanadium furnace lining through conventional knotting-baking forming.
Comparative example 2
The method of example 2 was used, except that in step (2), the composite binder was controlled to be 22% by weight of the magnesite clinker.
Comparative example 3
The method of example 4 was used, except that in step (2), the composite binder was controlled to be 1% by weight of the magnesite clinker.
Comparative example 4
The process of example 2 was carried out, except that in step (1), the inorganic binder was used in an amount of 95 wt% and the organic binder was used in an amount of 5 wt%, based on 100% by weight of the total weight of the inorganic binder and the organic binder.
Comparative example 5
The process of example 4 was carried out, except that in step (1), the inorganic binder was used in an amount of 65 wt% and the organic binder was used in an amount of 35 wt%, based on 100 wt% of the total weight of the inorganic binder and the organic binder.
Test example
1. The furnace lining density and porosity of the furnace lining prepared in the example and the comparative example are respectively detected by a weighing-wax sealing volume method and a resin shaping microscopic section observation combined with an Image analysis software Image J or Image Pro plus analysis method, and the results are shown in Table 1.
TABLE 1
| Numbering | Example 1 | Example 2 | Example 3 | Example 4 | |
| Density of furnace lining g/cm3 | 3.48 | 2.95 | 3.48 | 2.95 | |
| Porosity% | 3 | 5 | 12 | 3 | |
| Numbering | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Density of furnace lining g/cm3 | 2.45 | 2.64 | 2.42 | 2.13 | 2.47 |
| Porosity% | 15 | 14 | 16 | 18 | 21 |
According to the results, the preparation method of the furnace lining of the ferrovanadium smelting furnace effectively improves the density of the furnace lining, obviously reduces the porosity of the furnace lining, and is beneficial to reducing infiltration and erosion of liquid slag and metal.
2. The furnace linings prepared in the examples and the comparative examples are placed in ferrovanadium smelting furnaces of the same type, and smelting is carried out under the same conditions by using the same smelting raw materials. The content of magnesium oxide in the smelting slag obtained by smelting and the smelting yield are detected, and the results are shown in table 2.
| Numbering | Example 1 | Example 2 | Example 3 | Example 4 | |
| The smelting yield is% | 96.85 | 96.91 | 97.01 | 96.58 | |
| MgO content% | 8.13 | 5.24 | 5.14 | 8.43 | |
| Numbering | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| The smelting yield is% | 95.48 | 95.61 | 95.87 | 95.88 | 95.76 |
| MgO content% | 12.56 | 15.43 | 14.36 | 11.86 | 13.49 |
From the results, the vanadium iron alloy smelting furnace lining prepared by the method can effectively reduce the content of magnesium oxide in the smelting slag and can improve the smelting yield.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A preparation method of a furnace lining of a ferrovanadium smelting furnace is characterized by comprising the following steps:
(1) mixing an inorganic binder and an organic binder to obtain a composite binder;
(2) mixing the composite binder obtained in the step (1) with magnesia, and then adding water to stir to obtain a wet-beating material;
(3) injecting a wet-beating material into a mould for knotting and forming, then removing the mould, spraying a liquid binder on the surface in contact with the mould, then airing, and then carrying out oxygen-enriched baking to obtain a vanadium-iron alloy smelting furnace lining;
in the step (1), the total weight of the inorganic binder and the organic binder is 100%, the inorganic binder is 70-90 wt%, and the organic binder is 10-30 wt%;
in the step (2), the amount of the composite binder is 2-20 wt% of the total weight of the magnesite.
2. The method for preparing a lining of a ferrovanadium smelting furnace according to claim 1, wherein in step (1), the inorganic binder is at least one selected from the group consisting of hydrated alumina, colloidal alumina, magnesium citrate and magnesium stearate.
3. The method for preparing a vanadium iron alloy smelting furnace lining according to claim 1 or 2, wherein in step (1), the organic binder is carboxymethyl cellulose and/or pregelatinized starch.
4. The method for preparing a vanadium iron alloy smelting furnace lining according to claim 1, wherein in the step (2), the magnesite clinker comprises 50 to 60 wt% of fine-fraction magnesite clinker, 20 to 30 wt% of medium-fraction magnesite clinker and 10 to 20 wt% of coarse-fraction magnesite clinker, wherein the fine-fraction magnesite clinker has a grain size of less than 0.074mm, the medium-fraction magnesite clinker has a grain size of 0.074mm to 1.18mm, and the coarse-fraction magnesite clinker has a grain size of 1.40mm to 2.36 mm.
5. The method for preparing the vanadium iron alloy smelting furnace lining according to claim 1, wherein in the step (2), the moisture content of the wet-beating material is 3-9 wt%.
6. The method for preparing a lining of a ferrovanadium smelting furnace according to claim 1, wherein in the step (3), the liquid binder is a solution containing carboxymethyl cellulose.
7. The method for preparing the lining of the ferrovanadium smelting furnace according to claim 6, wherein the concentration of the carboxymethyl cellulose in the solution containing the carboxymethyl cellulose is 5 to 8 wt%.
8. The method for preparing the lining of the ferrovanadium smelting furnace according to claim 1, wherein in the step (3), the oxygen-enriched baking is baking by using gas combustion heating under an oxygen-containing combustion-supporting atmosphere;
preferably, the specific process of oxygen-enriched roasting comprises the following steps: under the oxygen-containing combustion-supporting atmosphere with the oxygen content of 22-35%, under the condition that the gas flow is 600-800 Nm3Baking for 2-5h under the condition of/h, and then baking at the gas flow rate of 1200-1800 Nm3Baking for 3-10h under the condition of/h.
9. A ferrovanadium smelter lining produced by the method defined in any one of claims 1 to 8.
10. The ferrovanadium smelting furnace lining of claim 9, wherein the ferrovanadium smelting furnace lining has a lining density of 2.95 to 3.48g/cm3The porosity is 3-12%.
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