CN115608589A - Energy-saving method for spraying black body material on inner wall of steel rolling heating furnace - Google Patents
Energy-saving method for spraying black body material on inner wall of steel rolling heating furnace Download PDFInfo
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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Abstract
The invention relates to an energy-saving method for spraying black body material on the inner wall of a steel rolling heating furnace, belonging to the field of metal pressure processing. The invention is to spray the black body material which mainly comprises rare earth polishing powder waste, waste iron slag after rare earth iron boron is recovered and high-temperature adhesive on the inner wall of a steel rolling heating furnace, and the black body material is obtained by burning at the high temperature of 1200-1400 ℃; compared with the blackbody material which is not sprayed, the heating rate of the steel billet is improved by more than 20 percent, the heat efficiency of the steel rolling heating furnace is improved by more than 15 percent, the output of the heated steel billet is improved by more than 20 percent, and the energy is saved by more than 15 percent per ton of steel billet. The invention obviously enhances the emissivity of the inner wall of the heating furnace, improves the uniformity of the temperature field in the heating furnace, reduces the temperature difference of the section of the billet, improves the internal structure and the performance of the billet by uniformly heating the billet, improves the heating quality of the billet, blocks the pollution of compounds in refractory materials to the billet, prolongs the service life of the steel rolling heating furnace, and has practical application value in reducing energy consumption in the steel rolling industry.
Description
Technical Field
The invention belongs to the field of metal pressure processing, and particularly relates to an energy-saving method for spraying a black body material on the inner wall of a steel rolling heating furnace.
Background
The steel industry is an important component of economic development in China, and is also an energy consumer, which can reach about 12% of total energy consumption in the country, and the steel rolling process can account for 13-20% of the total energy consumption in the steel industry in the country, and compared with the steel rolling process outside the country, the energy consumption is obviously overlarge.
The heating furnace is the key equipment of a steel rolling mill, the average energy consumption of the heating furnace of most of the iron and steel enterprises in China is about 48kgce/t and accounts for 80 percent of the energy consumption of the whole steel rolling process, compared with the energy consumption level of a steel mill in developed countries such as Pu, new day iron and the like which is already at the level of 37kgce/t in 2007, has great energy-saving potential. The operating state of the heating furnace has great influence on yield, quality and energy consumption, and the optimization of the operating state of the heating furnace is the key point of a steel mill in the process of energy-saving work propulsion.
At present, a steel rolling heating furnace generally adopts a steel pushing type heating furnace, a stepping type heating furnace, a tunnel kiln type heating furnace and an annular heating furnace (steel pipe heating), the heating furnace is generally divided into a preheating section, a heating section and a soaking section, the purpose is to uniformly heat a steel billet and reach the rolling temperature, the plasticity of the steel billet is improved, the deformation resistance is reduced, the steel is easy to roll, the surface and the inside of the steel billet are uniformly heated, the homogenization of the nonuniform organization and the nonmetallic inclusion in the steel billet is facilitated, and the product quality is improved.
In the steel rolling heating furnace, heat generated by fuel combustion is mainly transferred to a heated billet in two modes of radiation and convection, wherein radiation heat transfer accounts for more than or equal to 90% of the whole heat transfer quantity, and heat transferred by radiation of the inner walls (furnace walls and furnace top) accounts for 60% of the whole radiation heat transfer quantity. The infrared radiation emissivity of the refractory material on the inner wall of the conventional steel rolling heating furnace is 0.3-0.6, the heat absorbed by the refractory material is transmitted to the outside of the furnace through the refractory material, the steel billet is heated by the radiation infrared rays, the reflected heat is absorbed by the flue gas and is discharged out of the furnace, the higher the reflectivity is, the greater the heat loss is, the radiation emissivity of the inner wall of the heating furnace is obviously improved, and the energy lost by heat conduction and reflection is obviously reduced, so that the increase of the radiation capacity of the inner wall of the heating furnace is an important way for strengthening the heat exchange of the heating furnace and improving the heat utilization rate.
A large number of reported blackbody materials are applied to a steel rolling heating furnace at home and abroad, the blackbody materials are sprayed, the radiation heat transfer of the heating furnace is obviously improved, and the energy-saving effect is obvious, but some blackbody materials have the properties of easy decomposition, volatilization, phase change and the like under the high-temperature condition and are not suitable to be used as high-temperature radiation materials of the steel rolling heating furnace, for example, zhou Huimin and the like report green manufacturing technologies for the steel rolling heating furnace: high-radiation coating technique using SiC or ZrO 2 As the compounds are used as high-emission radiation materials, the radiation rate of SiC reaches 0.9 at high temperature, but SiC is very easy to oxidize at high temperature, the emissivity is reduced after SiO2 is generated, and the materials have high radiation rate at the initial stage of a steel rolling heating furnace in the production process, so that the energy is saved, the consumption is obviously reduced, but the radiation rate of the materials is gradually reduced and the energy-saving effect is reduced through a long-term production process. The operating temperature of the steel rolling heating furnace is usually 1250-1350 ℃, and a common blackbody cannot adapt to the high operating temperature, so that a high-temperature radiation material with high radiation rate, stable high-temperature performance and low cost needs to be developed to meet the energy-saving requirement of the steel rolling heating furnace.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the defects in the prior art, and provides an energy saving method for spraying black body material on the inner wall of a steel rolling heating furnace.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an energy-saving method of blackbody spraying materials in a steel rolling heating furnace comprises the following steps: and removing refractory clay and dust on the surface of the refractory material on the inner wall of the steel rolling heating furnace, spraying the blackbody spraying material on the surface of the refractory material, and then drying and calcining at room temperature to obtain the steel rolling heating furnace sprayed with the blackbody material.
Further, the spraying thickness of the spraying step is 0.1-0.5mm.
Further, the calcining step specifically comprises: and gradually raising the temperature of the steel rolling heating furnace, wherein the highest calcining temperature is 1200-1400 ℃, and preserving the heat for 2-6h. The black body spraying material and the inner wall refractory material are firmly combined together, and the full-wavelength integral emissivity of the black body spraying material in the working temperature range is more than 0.90.
Further, the steel rolling heating furnace is a stepping type, steel pushing type or tunnel kiln type steel rolling heating furnace; the inner wall of the steel rolling heating furnace is a furnace wall and a furnace top in the steel rolling heating furnace.
The blackbody spraying material consists of a blackbody material and a high-temperature adhesive solution, wherein the blackbody material is 1:1-2 in mass ratio.
Further, the black body material comprises rare earth polishing powder waste and waste iron slag obtained after rare earth is recycled by rare earth iron boron.
Further, the high-temperature adhesive solution is an aluminum dihydrogen phosphate solution, and the concentration of the aluminum dihydrogen phosphate solution is 40-60%.
The preparation method of the black body spraying material comprises the following steps: and mixing and stirring the black body material and the high-temperature adhesive solution to obtain the black body spraying material.
A method for heating a steel slab, comprising the steps of: and (3) heating the steel rolling heating furnace sprayed with the black body spraying material to raise the temperature, and enabling the steel billet to pass through the preheating section, the heating section and the soaking section of the heating furnace, wherein the section and the surface of the steel billet at the discharge end are close to the temperature in the heating furnace, so as to obtain the heated steel billet.
Further, the maximum temperature of the temperature rising step is 1200-1400 ℃.
The black body material is composed of rare earth polishing powder waste, waste iron slag obtained after rare earth is recovered from rare earth iron boron, and rare earth compounds with a spinel structure and a fluorite structure which are formed by firing at 1400 ℃, and the material has stable property and high radiance at high temperature;
the emissivity of the refractory material of the steel rolling heating furnace is 0.3-0.6, while the emissivity of the steel rolling heating furnace sprayed with the black body is more than 0.90, so that the radiation performance of the inner wall of the steel rolling heating furnace is enhanced, the heat transferred to the steel billet by the inner wall radiation according to the Stefan-Boltzmann law is in direct proportion to the fourth power of the absolute temperature of the inner wall, and the heating energy of the steel billet is obviously enhanced by increasing the emissivity of the inner wall;
the black body material is sprayed, so that the absorption and radiation of the inner wall of the heating furnace to heat energy are enhanced, the heating efficiency of the billet is improved, the reflection of the heat of the inner wall of the furnace is correspondingly reduced, the heat transmitted to the smoke by reflection is reduced, and the temperature of the smoke discharged out of the furnace is reduced;
the black body can change the wave spectrum distribution of the infrared radiation in the furnace, the discontinuous wave spectrum is changed into a continuous wave spectrum, the far infrared rays emitted by the black body directly penetrate into the billet to be heated, the temperature difference of the section of the billet is reduced, and the internal organization and the performance of the billet are improved as the billet is uniformly heated;
the black body emits far infrared rays to accelerate the heating speed of the steel billet and shorten the heating time, thereby avoiding adverse reaction reactions such as oxidation burning loss, decarburization, grain growth, steel adhesion and the like of the steel billet, being beneficial to eliminating black marks and improving the heating quality of the steel billet.
Compared with the prior art, the invention has the following advantages:
the black body spraying material obviously enhances the infrared radiation emissivity of the inner wall of the heating furnace, improves the uniformity of the temperature field in the heating furnace, and compared with the heating furnace with the same conventional model, the heating rate of the billet is improved by more than 20 percent, the heat efficiency of the steel rolling heating furnace is improved by more than 15 percent, the output of the heated billet is improved by more than 20 percent, and the energy is saved by more than 15 percent per ton of billet.
The blackbody spraying material obviously enhances the infrared radiation emissivity of the inner wall of the heating furnace, improves the uniformity of the temperature field in the heating furnace, reduces the temperature difference of the section of the billet, improves the internal structure and performance of the billet by uniformly heating the billet, improves the heating quality of the billet, blocks the pollution of compounds in refractory materials to the billet, prolongs the service life of the steel rolling heating furnace, and has practical application value in reducing energy consumption in the steel rolling industry.
The far infrared rays emitted by the black body spraying material directly penetrate into the steel billet to be heated, so that the heating time is obviously shortened.
The blackbody spraying material has higher stability in high-temperature, reducing and oxidizing environments, and the service life of the heating furnace is prolonged.
The blackbody spraying material is tightly combined with the refractory material of the heating furnace, and a layer of glaze is formed on the surface of the refractory material, so that the pollution of compounds in the refractory material to steel billets is blocked.
The black body spraying material has high infrared radiation emissivity, reduces the temperature difference of the section of the billet, improves the internal structure and performance of the billet by uniformly heating the billet, and improves the heating quality of the billet.
The black body spraying material is easily sprayed on the surface of the refractory material of the steel rolling heating furnace.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are all conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
An energy-saving method of blackbody spraying materials in a steel rolling heating furnace comprises the following steps:
(1) Mixing and stirring the blackbody material with the mass ratio of 1:1 and the high-temperature adhesive solution to prepare a blackbody spraying material; the high temperature binder is a 50% solution of aluminum dihydrogen phosphate in (La) 0.36 Ce 0.64 )PO 4 With Al (H) 2 PO 4 ) 3 The mass contents are respectively 2% and 48%; wherein the iron oxide content is 95%, the boron oxide content is 1%, the silicon oxide content is 2.3%, the calcium oxide content is 1.3%, and the barium oxide content is 0.4%;
(2) Removing refractory mud and dust from the surfaces of refractory materials on the inner walls (the furnace wall and the furnace top) of the stepping heating furnace, spraying black body materials on the surfaces of the refractory materials, wherein the spraying thickness is 0.3mm, drying at room temperature, gradually heating the heating furnace, keeping the highest calcining temperature at 1400 ℃ for 4 hours, and firmly combining the black body materials with the refractory materials on the inner walls to obtain the steel rolling stepping heating furnace sprayed with the black body materials, wherein the full-wavelength integral emissivity of the black body materials in the working temperature range is 0.90;
(3) When the temperature of the steel rolling stepping heating furnace sprayed with the black body spraying material is raised to 1250 ℃, the steel billet passes through a preheating section, a heating section and a soaking section of the heating furnace, and the section and the surface of the steel billet at the discharge end are close to the temperature in the furnace, so that the heated steel billet is obtained;
(4) Compared with the spraying of black body materials, the steel rolling stepping heating furnace inner wall spraying method has the advantages that the heating rate of the steel billet is improved by 20.3%, the heating efficiency of the heating furnace is improved by 15.6%, the yield of the heated steel billet is improved by 20.7%, and the energy is saved by 15.4% per ton of the steel billet.
Example 2
An energy-saving method of blackbody spraying materials in a steel rolling heating furnace comprises the following steps:
(1) Mixing and stirring the blackbody material with the mass ratio of 1:1 and the high-temperature adhesive solution to prepare a blackbody spraying material; the high-temperature adhesive is 50% aluminum dihydrogen phosphate solution; wherein the iron oxide content is 95%, the boron oxide content is 1%, the silicon oxide content is 2.3%, the calcium oxide content is 1.3%, and the barium oxide content is 0.4%;
(2) Removing refractory mud and dust from the surfaces of refractory materials on the inner walls (the furnace wall and the furnace top) of the stepping heating furnace, spraying black body materials on the surfaces of the refractory materials, wherein the spraying thickness is 0.3mm, drying at room temperature, gradually heating the heating furnace, keeping the highest calcining temperature at 1400 ℃ for 4 hours, and firmly combining the black body materials with the refractory materials on the inner walls to obtain the steel rolling stepping heating furnace sprayed with the black body materials, wherein the full-wavelength integral emissivity of the black body materials in the working temperature range is 0.91;
(3) When the temperature of the steel rolling stepping heating furnace sprayed with the black body spraying material is raised to 1300 ℃, the steel billet passes through a preheating section, a heating section and a soaking section of the heating furnace, and the section and the surface of the steel billet at the discharging end are close to the temperature in the furnace, so that the heated steel billet is obtained;
(4) Compared with the spraying of black body materials, the temperature rising rate of the steel billet is improved by 20.9 percent, the heat efficiency of the heating furnace is improved by 16.1 percent, the yield of the heated steel billet is improved by 21.2 percent, and the energy is saved by 15.8 percent per ton of the steel billet.
Example 3
An energy-saving method of blackbody spraying materials in a steel rolling heating furnace comprises the following steps:
(1) Mixing and stirring the blackbody material with the mass ratio of 1:1 and the high-temperature adhesive solution to prepare a blackbody spraying material; the high-temperature adhesive is 50% aluminum dihydrogen phosphate solution; wherein the iron oxide content is 95%, the boron oxide content is 1%, the silicon oxide content is 2.3%, the calcium oxide content is 1.3%, and the barium oxide content is 0.4%;
(2) Removing refractory mortar and dust from the refractory material surface of the inner wall (furnace wall and furnace top) of the walking beam furnace, spraying black body material on the refractory material surface, wherein the spraying thickness is 0.3mm, after drying at room temperature, gradually heating the furnace, keeping the highest calcining temperature at 1400 ℃ for 4 hours, and firmly combining the black body material and the refractory material of the inner wall to obtain the steel rolling walking beam furnace sprayed by the black body material, wherein the total wavelength integral emissivity of the black body material in the working temperature range is 0.92;
(3) When the temperature of the steel rolling stepping heating furnace sprayed with the black body spraying material is raised to 1350 ℃, the steel billet passes through a preheating section, a heating section and a soaking section of the heating furnace, and the section and the surface of the steel billet at the discharging end are close to the temperature in the heating furnace, so that the heated steel billet is obtained;
(4) Compared with the spray coating of black body materials, the spray coating of the inner wall of the steel rolling push type heating furnace has the advantages that the heating rate of the steel billet is improved by 21.3 percent, the heat efficiency of the heating furnace is improved by 16.7 percent, the yield of the heated steel billet is improved by 21.8 percent, and the energy is saved by 16.3 percent per ton of the steel billet.
Comparative example 1
An energy-saving method of blackbody spraying materials in a steel rolling heating furnace comprises the following steps:
(1) Mixing and stirring the blackbody material with the mass ratio of 1:3 and a binder solution to prepare a blackbody spraying material; the high-temperature adhesive is 50% aluminum dihydrogen phosphate solution; the black body material mainly comprises rare earth polishing powder waste and waste iron slag obtained after rare earth is recovered from rare earth iron boron, wherein the content of ferric oxide is 95 percent, the content of boron oxide is 1 percent, the content of silicon oxide is 2.3 percent, the content of calcium oxide is 1.3 percent, and the content of barium oxide is 0.4 percent;
(2) Removing refractory mud and dust from the surfaces of refractory materials on the inner walls (the furnace wall and the furnace top) of the stepping heating furnace, spraying black body materials on the surfaces of the refractory materials, wherein the spraying thickness is 0.3mm, drying at room temperature, gradually heating the heating furnace, keeping the highest calcining temperature at 1400 ℃ for 4 hours, and firmly combining the black body materials with the refractory materials on the inner walls to obtain the steel rolling stepping heating furnace sprayed with the black body materials, wherein the full-wavelength integral emissivity of the black body materials in the working temperature range is 0.86;
(3) When the temperature of the steel rolling stepping heating furnace sprayed with the black body spraying material is raised to 1250 ℃, the steel billet passes through a preheating section, a heating section and a soaking section of the heating furnace, and the section and the surface of the steel billet at the discharging end are close to the temperature in the furnace, so that the heated steel billet is obtained;
(4) Compared with the spraying of black body materials, the steel rolling stepping heating furnace inner wall spraying method has the advantages that the heating rate of the steel billet is improved by 12.3 percent, the heating efficiency of the heating furnace is improved by 11.6 percent, the yield of the heated steel billet is improved by 13.5 percent, and the energy is saved by 10.5 percent per ton of the steel billet.
Comparative example 2
An application method of blackbody spraying material in a steel rolling heating furnace comprises the following steps:
(1) Mixing and stirring iron oxide and high-temperature adhesive solution in a mass ratio of 1:1 to prepare the blackbody spraying material; the high-temperature adhesive is 50% aluminum dihydrogen phosphate solution;
(2) Removing refractory mud and dust from the surfaces of refractory materials on the inner walls (the furnace wall and the furnace top) of the stepping heating furnace, spraying black body materials on the surfaces of the refractory materials, wherein the spraying thickness is 0.3mm, drying at room temperature, gradually heating the heating furnace, keeping the temperature at the highest temperature of 1400 ℃ for 4 hours, and firmly combining the black body materials with the refractory materials on the inner walls to obtain the steel rolling stepping heating furnace sprayed with the black body materials, wherein the full-wavelength integral emissivity of the black body materials in the working temperature range is 0.87;
(3) When the temperature of the steel rolling stepping heating furnace sprayed with the black body spraying material is raised to 1250 ℃, the steel billet passes through a preheating section, a heating section and a soaking section of the heating furnace, and the section and the surface of the steel billet at the discharging end are close to the temperature in the furnace, so that the heated steel billet is obtained;
(4) Compared with the spraying of black body materials, the steel rolling stepping heating furnace inner wall spraying method has the advantages that the heating rate of the steel billet is increased by 11%, the heating efficiency of the heating furnace is increased by 8.8%, the yield of the heated steel billet is increased by 13.1%, and the energy is saved by 8.8% per ton of steel billet.
Comparative example 3
An application method of blackbody spraying material in a steel rolling heating furnace comprises the following steps:
(1) Mixing and stirring the black body material with the mass ratio of 1:1 and the high-temperature adhesive solution to prepare the black body spraying material; the high-temperature adhesive is 50% of silica sol solution; the black body material mainly comprises rare earth polishing powder waste and waste iron slag after rare earth iron boron is recycled, wherein the content of ferric oxide is 95 percent, the content of boron oxide is 1 percent, the content of silicon oxide is 2.3 percent, the content of calcium oxide is 1.3 percent, and the content of barium oxide is 0.4 percent;
(2) Removing refractory mud and dust from the surfaces of refractory materials on the inner walls (the furnace wall and the furnace top) of the stepping heating furnace, spraying black body materials on the surfaces of the refractory materials, wherein the spraying thickness is 0.3mm, drying at room temperature, gradually heating the heating furnace, keeping the temperature at the highest temperature of 1400 ℃ for 4 hours, and firmly combining the black body materials with the refractory materials on the inner walls to obtain the steel rolling stepping heating furnace sprayed with the black body materials, wherein the full-wavelength integral emissivity of the black body materials in the working temperature range is 0.85;
(3) When the temperature of the steel rolling stepping heating furnace sprayed with the black body spraying material is raised to 1250 ℃, the steel billet passes through a preheating section, a heating section and a soaking section of the heating furnace, and the section and the surface of the steel billet at the discharging end are close to the temperature in the furnace, so that the heated steel billet is obtained;
(4) Compared with the spraying of black body materials, the steel rolling stepping heating furnace inner wall spraying method has the advantages that the heating rate of the steel billet is improved by 14.6%, the heating efficiency of the heating furnace is improved by 10.8%, the yield of the heated steel billet is improved by 13.9%, and the energy is saved by 11% per ton of the steel billet.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An energy-saving method of blackbody spraying materials in a steel rolling heating furnace is characterized in that: the method comprises the following steps: and (3) removing refractory mortar and dust on the surface of the refractory material on the inner wall of the steel rolling heating furnace, spraying the blackbody spraying material on the surface of the refractory material, and then drying and calcining at room temperature to obtain the steel rolling heating furnace sprayed with the blackbody material.
2. The energy saving method of blackbody coating material in a steel rolling heating furnace according to claim 1, wherein: the spraying thickness in the spraying step is 0.1-0.5mm.
3. The energy saving method of blackbody coating material in a steel rolling heating furnace according to claim 1, wherein: the calcining step specifically comprises the following steps: and gradually heating the steel rolling heating furnace, keeping the highest calcining temperature of 1200-1400 ℃ for 2-6h.
4. The energy saving method of blackbody coating material in a steel rolling heating furnace according to claim 1, wherein: the steel rolling heating furnace is a stepping type, steel pushing type or tunnel kiln type steel rolling heating furnace; the inner wall of the steel rolling heating furnace is a furnace wall and a furnace top in the steel rolling heating furnace.
5. A blackbody spraying material is characterized in that: the material consists of a blackbody material and a high-temperature adhesive solution in a mass ratio of 1:1-2.
6. A black body spray material according to claim 5, wherein: the black body material comprises rare earth polishing powder waste and waste iron slag obtained after rare earth is recovered from rare earth iron boron.
7. A black body spray material according to claim 5, wherein: the high-temperature adhesive solution is an aluminum dihydrogen phosphate solution, and the concentration of the aluminum dihydrogen phosphate solution is 40-60%.
8. The method of producing a blackbody spray material as set forth in any one of claims 5 to 7, wherein: the method comprises the following steps: and mixing and stirring the black body material and the high-temperature adhesive solution to obtain the black body spraying material.
9. A method for heating a steel slab, comprising: the method comprises the following steps: and (3) heating the steel rolling heating furnace sprayed with the black body spraying material to raise the temperature, and enabling the steel billet to pass through the preheating section, the heating section and the soaking section of the heating furnace, wherein the section and the surface of the steel billet at the discharge end are close to the temperature in the heating furnace, so as to obtain the heated steel billet.
10. The method of heating a steel slab as set forth in claim 9, wherein: the maximum temperature of the temperature rising step is 1200-1400 ℃.
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