CN115160836A - High-emissivity infrared radiation coating based on copper smelting slag and preparation method and coating thereof - Google Patents
High-emissivity infrared radiation coating based on copper smelting slag and preparation method and coating thereof Download PDFInfo
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Abstract
The invention discloses a high-emissivity infrared radiation coating based on copper smelting slag, a preparation method thereof and a coating, wherein the coating comprises the following preparation raw materials in parts by weight: 58-80 parts of copper smelting slag fine powder, 12-27 parts of modified iron scale fine powder, 3-8 parts of alumina micro powder, 2-5 parts of sodium silicate glass powder, 1-3 parts of Guangxi white mud, 0.5-1.5 parts of sodium silicate powder and 0.5-1 part of ammonium lignosulfonate. According to the invention, a large amount of copper smelting slag is used as a raw material, and the copper smelting slag belongs to solid waste, so that the production cost of the high-emissivity infrared radiation coating can be reduced, and a new way is provided for the high value-added utilization of the solid waste; the prepared infrared radiation coating is easily coated on the surface of the refractory material of the industrial kiln, and the average emissivity of the infrared radiation coating with the wave band of 0.75-2.5 mu m based on the copper smelting slag is tested to be 0.85-0.94 by using high-temperature infrared emissivity testing equipment; the high-emissivity infrared radiation coating based on the copper smelting slag can be used for a long time in an environment of 800-1400 ℃.
Description
Technical Field
The invention relates to an infrared radiation coating, a preparation method thereof and the field of coatings, in particular to a copper smelting slag-based high-emissivity infrared radiation coating, a preparation method thereof and a coating.
Background
Copper smelting generally refers to the formation of copper concentrate to refined copper, with pyrometallurgical copper smelting being the predominant process. In the pyrometallurgical copper smelting process, 2-3 tons of copper slag are discharged when 1 ton of copper is produced, and about 2000 ten thousand tons of copper slag are produced every year in China. The main phase in the copper slag is magnetite (Fe) 3 O 4 ) Iron olivine (2 FeO. SiO) 2 ) And an amorphous glass body composed of gangue. Fe in flash slag 3 O 4 The content of the copper in the slag is higher, the copper content of the slag is about 1% -3%, and the Cu content of part of the slag is 4.5%.
At present, copper smelting slag generally obtains slag concentrate and tailings after copper is recovered through flotation, wherein the slag concentrate contains about 30% of Cu and generally returns to a batching system; the tailings contain about 0.4 percent of Cu, the iron grade is 52 percent, and the main component is iron oxide which can be used as a raw material of iron ore concentrate or an admixture for cement production. However, according to the requirement of iron making, when the tailings with high copper content are used as the raw material of iron ore concentrate, the copper content of the tailings must be reduced to about 0.2%. Therefore, the reasonable utilization range of the tailings containing high copper content is directly limited, so that a great deal of tailings containing high copper content has to be treated by adopting a stacking method. Generally, the direct utilization rate of copper smelting slag in China is very low, and the tailings amount of partial treatment modes is still large; the disordered stacking of the copper slag tailings not only occupies a large amount of land resources, but also causes serious environmental pollution due to the fact that the copper slag contains heavy metal elements such As Cd, pb and As.
On the other hand, the energy consumption of industrial kilns accounts for about 25% of the total national energy consumption, and the high-temperature industries such as metallurgy, building materials and the like in China can be huge. Therefore, the energy conservation of the kiln is also a hot spot of the current research and production application. In a high-temperature environment of more than 800 ℃, heat transfer is mainly radiation heat transfer; the heat efficiency of the kiln can be greatly improved by enhancing the radiation heat transfer, and the energy conservation of the kiln is realized. Most of the existing industrial kilns have the working temperature of 800-1400 ℃, and the coating of the high-emissivity infrared radiation coating on the surface of the furnace wall of the existing industrial kilns is an important way, particularly the infrared emissivity of the infrared radiation coating in a wave band of 0.75-5 mu m is improved to be more than 0.85, and the energy-saving effect is more obvious.
Chinese patent CN 1038296A is a method for producing far infrared radiation paint, which adopts 20-70% copper slag as raw material to produce far infrared radiation paint; wherein, in the embodiment 1, 30 percent of copper slag is adopted, and the all-band radiance is 0.9; example 2 the 30% copper slag is adopted, and although the full-wave band radiance can reach 0.92, the copper slag is coated on the surface of the metal material. Generally, far infrared coatings focus on the emissivity of far infrared bands above 8 μm. Because the information in the patent technology is limited, whether the total emissivity in the patent technology contains a near-infrared band of 0.75-5 μm playing a leading role in high-temperature use cannot be determined; in addition, the use effect of the catalyst in a kiln at the temperature of more than 800 ℃ is not clear.
In addition, the university of Beijing technology Zhang Jian university of Beijing in 2019, doctor's academic paper "spinel type ferrite material infrared radiation performance enhancement basic research" shows that Fe is generated under room temperature 3 O 4 Is a material with high infrared emissivity in the wave band of 3-5 mu m, but Fe 3 O 4 Unstable at high temperatures, fe at temperatures above 600 ℃ 3 O 4 Will be oxidized and transformed into Fe 2 O 3 And is of Fe 2 O 3 The emissivity of (2) is only about 0.6 at 3-5 μm. By direct introduction of Fe 3 O 4 The material is difficult to be used for preparing the infrared radiation coating in an industrial kiln at 800-1400 ℃ for a long time.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems in the prior art, the invention provides a high-emissivity infrared radiation coating based on copper smelting slag, a preparation method thereof and a coating, wherein the coating is high in cost, low in cost, high in emissivity and high in temperature resistance, has a high infrared emissivity in a 0.75-5 mu m waveband, and can be used for a long time in an environment of 800-1400 ℃.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme: the high-emissivity infrared radiation coating based on copper smelting slag comprises the following preparation raw materials in parts by weight: 58-80 parts of copper smelting slag fine powder, 12-27 parts of modified iron scale fine powder, 3-8 parts of alumina micro powder, 2-5 parts of sodium silicate glass powder, 1-3 parts of Guangxi white mud, 0.5-1.5 parts of sodium silicate powder and 0.5-1 part of ammonium lignosulfonate.
Furthermore, the copper smelting slag fine powder is fine powder obtained by grinding residues generated in the process of preparing blister copper by adopting a pyrometallurgical copper smelting process until the particle size is less than 74 mu m; the TFe content is more than or equal to 40 percent; the content of CuO is more than or equal to 0.2 percent.
The invention selects the copper smelting slag as the main raw material of the infrared radiation coating, and on one hand, the invention utilizes the magnetite (Fe) as the main phase in the copper smelting slag 3 O 4 ) As functional elements of infrared radiation; on the other hand, the amorphous glass body in the slag can better wrap Fe 3 O 4 Thereby greatly reducing Fe 3 O 4 Thereby ensuring that the prepared infrared radiation coating has high infrared emissivity in a wave band of 3-5 mu m.
Furthermore, the modified iron scale fine powder is fine powder obtained by uniformly mixing 8-18 parts by weight of iron scale fine powder, 3-6 parts by weight of magnesium oxide fine powder and 1-2 parts by weight of waste copper powder, pressing the mixture into a blank under the condition of 50-100 MPa, preserving the heat for 3-6 hours at the temperature of 1000-1400 ℃, naturally cooling the blank along with a furnace, crushing the cooled blank and screening the crushed blank until the particle size is less than 74 mu m.
Furthermore, the TFe content in the fine iron scale powder is more than or equal to 70 percent, and the average grain diameter is less than 45 mu m.
The main components of the iron scale are FeO and Fe 2 O 3 And Fe 3 O 4 . FeO and Fe when the iron scale, the magnesium oxide and the waste copper powder are subjected to high-temperature heat treatment at the temperature of 1000-1400 DEG C 2 O 3 Reacting with magnesium oxide to generate FeO-MgO solid solution and pleonaste; the waste copper powder is easier to oxidize than FeO at the temperature, so that the oxidation of FeO in the iron scale can be reduced, and the generated CuO can be further mixed with Fe 2 O 3 The reaction produces copper-iron spinel. Due to Fe 2+ 、Mg 2+ And Cu 2+ The size difference is not large, so that the phenomenon that three ions are mutually substituted is likely to occur, and the non-standard result is obtainedComposition of Fe 3 O 4 Mixed spinels of hercynite and hercynite; the mixed spinel has a great amount of lattice distortion or defects which promote the enhancement of lattice vibration and the change of instantaneous dipole moment at high temperature, thereby greatly improving the infrared emissivity of the modified iron scale in a wave band of 0.75-2.5 mu m. The melting point of FeO-MgO solid solution formed after 40% of FeO is absorbed by MgO is still as high as 2000 ℃ and the melting point of pleonaste is as high as 1720 ℃, while Fe 3 O 4 The melting point is 1595 ℃, and the modified iron scale has higher use temperature. The invention selects the modified iron scale fine powder as the raw material of the infrared radiation coating, on one hand, the infrared emissivity of the infrared radiation coating in a wave band of 0.75-2.5 mu m can be improved, and on the other hand, the use temperature of the infrared radiation coating taking copper smelting slag as the main material can also be improved.
In addition, when the infrared radiation coating mainly comprising the copper smelting slag is used in the high-temperature environment of 800-1400 ℃, fe 3 O 4 Fe in mixed spinel consisting of magnesium-iron spinel, copper-iron spinel and the like 2+ 、Mg 2+ And Cu 2+ Can further interdiffuse even Cu in copper smelting slag 2+ Or Zn 2+ It may also participate in this diffusion, which further increases the complexity of the spinel, thus ensuring that the ir-radiating coating based on copper smelting slag maintains a high ir-emissivity in the 0.75-2.5 μm band.
Furthermore, the MgO content in the magnesium oxide fine powder is more than or equal to 96 percent, and the average grain diameter is less than 45 mu m.
Furthermore, the content of Cu in the waste copper powder is more than or equal to 90 percent, and the average grain diameter is less than 45 mu m.
Further, the sodium silicate glass powder has an average particle size of less than 45 μm; the average grain diameter of the alumina micro powder is less than 3 μm.
The invention also discloses a preparation method of the copper smelting slag-based high-emissivity infrared radiation coating, which comprises the following steps: mixing the preparation raw materials according to a formula to obtain a mixed raw material, adding deionized water into the mixed raw material according to the weight ratio of the mixed raw material to the deionized water of 100: 48-75, and ball-milling for 0.5-3 h in a planetary ball mill to prepare the high-emissivity infrared radiation coating based on the copper smelting slag.
Furthermore, the grinding balls in the planetary ball mill are corundum balls, and the ball-material ratio is (2-4) to 1.
The invention also discloses a coating prepared by the coating, which is prepared by coating the coating on the surface of the refractory material of an industrial kiln, naturally drying for 12-24 h, and carrying out heat treatment for 2-4 h at 800-1400 ℃ or heating to 800-1400 ℃ along with the industrial kiln to obtain the copper smelting slag-based high-emissivity infrared radiation coating.
Has the advantages that:
(1) The invention adopts a large amount of copper smelting slag as the raw material, belongs to solid waste, can reduce the production cost of the high-emissivity infrared radiation coating, and provides a new way for the high value-added utilization of the solid waste.
(2) According to the invention, the alumina micro powder, the sodium silicate glass powder, the Guangxi white mud, the sodium silicate powder and the glass in the copper smelting slag are jointly used for forming the combination system, so that on one hand, the infrared radiation coating can be ensured to have better combination capability at a medium and low temperature, and a liquid phase generated at 800-1400 ℃ can not flow, thereby not only effectively solving the combination problem of the infrared radiation coating and an industrial kiln, but also improving the thermal shock stability of the infrared radiation coating; on the other hand, the proper liquid phase in the bonding system will also greatly reduce Fe 3 O 4 Thereby ensuring that the glass plays a role of infrared radiation in an environment of 800-1400 ℃ for a long time.
(3) The infrared radiation coating prepared by the invention can be easily coated on the surface of the refractory material of an industrial kiln, and the average emissivity of a copper smelting slag-based infrared radiation coating in a wave band of 0.75-2.5 mu m is tested to be 0.85-0.94 by using high-temperature infrared emissivity testing equipment; the high-emissivity infrared radiation coating based on the copper smelting slag can be used for a long time in an environment of 800-1400 ℃.
Detailed Description
Example 1:
the high-emissivity infrared radiation coating based on copper smelting slag comprises the following preparation raw materials in parts by weight: 58 parts of copper smelting slag fine powder, 12 parts of modified iron scale fine powder, 3 parts of alumina micro powder, 5 parts of sodium silicate glass powder, 1 part of Guangxi white mud, 1.5 parts of sodium silicate powder and 0.5 part of ammonium lignosulfonate.
Wherein the copper smelting slag fine powder is fine powder obtained by grinding residues generated in the process of preparing blister copper by adopting a pyrometallurgical copper smelting process until the particle size is less than 74 mu m; the TFe content is more than or equal to 40 percent; the content of CuO is more than or equal to 0.2 percent.
The modified iron scale fine powder is fine powder obtained by uniformly mixing 8 parts by weight of iron scale fine powder, 3 parts by weight of magnesium oxide fine powder and 1 part by weight of waste copper powder, pressing the mixture into a blank under the condition of 50MPa, preserving heat for 6 hours at the temperature of 1000 ℃, naturally cooling the blank along with a furnace, crushing the cooled blank and screening the crushed blank to the particle size of less than 74 mu m; the TFe content in the fine iron scale powder is more than or equal to 70 percent, and the average grain diameter is less than 45 mu m. The MgO content in the magnesium oxide fine powder is more than or equal to 96 percent, and the average grain diameter is less than 45 mu m. The Cu content in the waste copper powder is more than or equal to 90 percent, and the average grain diameter is less than 45 mu m;
the average grain diameter of the sodium silicate glass powder is less than 45 mu m; the average grain diameter of the alumina micro powder is less than 3 μm.
The preparation method of the high-emissivity infrared radiation coating based on the copper smelting slag comprises the following steps: mixing the preparation raw materials according to a formula to obtain a mixed raw material, adding deionized water into the mixed raw material according to the weight ratio of the mixed raw material to the deionized water of 100: 48, and performing ball milling for 0.5h in a planetary ball mill to obtain the copper smelting slag-based high-emissivity infrared radiation coating. The grinding balls in the planetary ball mill are corundum balls, and the ball material ratio is 2: 1.
And coating the coating on the surface of the refractory material of the industrial kiln, naturally drying for 12h, and carrying out heat treatment for 2h at 800 ℃ to obtain the copper smelting slag-based high-emissivity infrared radiation coating.
Example 2:
the high-emissivity infrared radiation coating based on copper smelting slag comprises the following preparation raw materials in parts by weight: 80 parts of copper smelting slag fine powder, 27 parts of modified iron scale fine powder, 8 parts of alumina micro powder, 2 parts of sodium silicate glass powder, 3 parts of Guangxi white mud, 0.5 part of sodium silicate glass powder and 1 part of ammonium lignosulfonate.
Wherein the copper smelting slag fine powder is fine powder obtained by grinding residues generated in the process of preparing blister copper by adopting a pyrometallurgical copper smelting process until the particle size is less than 74 mu m; the TFe content is more than or equal to 40 percent; the content of CuO is more than or equal to 0.2 percent.
The modified iron scale fine powder is fine powder obtained by uniformly mixing 18 parts by weight of iron scale fine powder, 6 parts by weight of magnesium oxide fine powder and 2 parts by weight of waste copper powder, pressing the mixture into a blank under the condition of 100MPa, preserving heat for 3 hours at the temperature of 1400 ℃, naturally cooling the blank along with a furnace, crushing the cooled blank and screening the crushed blank to the particle size of less than 74 mu m; the TFe content in the fine iron scale powder is more than or equal to 70 percent, and the average grain diameter is less than 45 mu m. The MgO content in the magnesium oxide fine powder is more than or equal to 96 percent, and the average grain diameter is less than 45 mu m. The Cu content in the waste copper powder is more than or equal to 90 percent, and the average grain diameter is less than 45 mu m;
the average grain diameter of the sodium silicate glass powder is less than 45 mu m; the average grain diameter of the alumina micro powder is less than 3 μm.
The preparation method of the high-emissivity infrared radiation coating based on the copper smelting slag comprises the following steps: mixing the preparation raw materials according to a formula to obtain a mixed raw material, adding deionized water into the mixed raw material according to the weight ratio of the mixed raw material to the deionized water of 100: 75, and performing ball milling for 3 hours in a planetary ball mill to obtain the copper smelting slag-based high-emissivity infrared radiation coating. The grinding balls in the planetary ball mill are corundum balls, and the ball material ratio is 4: 1.
Coating the coating on the surface of a refractory material of an industrial kiln, naturally drying for 24h, and carrying out heat treatment for 3h at 1400 ℃ to obtain the copper smelting slag-based high-emissivity infrared radiation coating.
Example 3:
the high-emissivity infrared radiation coating based on copper smelting slag comprises the following preparation raw materials in parts by weight: 70 parts of copper smelting slag fine powder, 20 parts of modified iron scale fine powder, 5 parts of alumina micro powder, 3 parts of sodium silicate glass powder, 2 parts of Guangxi white mud, 1.0 part of sodium silicate powder and 0.8 part of ammonium lignosulfonate.
Wherein the copper smelting slag fine powder is fine powder obtained by grinding residues generated in the process of preparing blister copper by adopting a pyrometallurgical copper smelting process until the particle size is less than 74 mu m; the TFe content is more than or equal to 40 percent; the content of CuO is more than or equal to 0.2 percent.
The modified iron scale fine powder is obtained by uniformly mixing 12 parts by weight of iron scale fine powder, 5 parts by weight of magnesium oxide fine powder and 2 parts by weight of waste copper powder, pressing the mixture into a blank under the condition of 75MPa, preserving heat for 5 hours at the temperature of 1200 ℃, naturally cooling the blank along with a furnace, crushing the cooled blank, and screening the crushed blank to obtain fine powder with the particle size of less than 74 mu m; the TFe content in the fine iron scale powder is more than or equal to 70 percent, and the average grain diameter is less than 45 mu m. The MgO content in the magnesium oxide fine powder is more than or equal to 96 percent, and the average grain diameter is less than 45 mu m. The Cu content in the waste copper powder is more than or equal to 90 percent, and the average grain diameter is less than 45 mu m;
the average grain diameter of the sodium silicate glass powder is less than 45 mu m; the average grain diameter of the alumina micro powder is less than 3 μm.
The preparation method of the high-emissivity infrared radiation coating based on the copper smelting slag comprises the following steps: mixing the preparation raw materials according to a formula to obtain a mixed raw material, adding deionized water into the mixed raw material according to the weight ratio of the mixed raw material to the deionized water of 100: 60, and performing ball milling for 2 hours in a planetary ball mill to obtain the copper smelting slag-based high-emissivity infrared radiation coating. The grinding balls in the planetary ball mill are corundum balls, and the ball material ratio is 3: 1.
And coating the coating on the surface of the refractory material of the industrial kiln, naturally drying for 20 hours, and heating to 1200 ℃ along with the industrial kiln to obtain the copper smelting slag-based high-emissivity infrared radiation coating.
With the addition of comparative examples 1 and 2,
comparative example 1:
other embodiments are the same as example 3, except that the formulation comprises the following preparation starting materials by weight: 50 parts of copper slag, 20 parts of ferric oxide and 30 parts of silica sol.
Wherein the copper slag is metallurgical industry slag, and the average grain diameter of the copper slag is less than 74 mu m; the ferric oxide is chemically pure, the average grain diameter is less than 45 mu m, and SiO in the silica sol 2 The content is more than or equal to 25 percent.
Comparative example 2:
other embodiments are the same as example 3, except that the formulation comprises the following preparation raw materials by weight: 50 parts of copper slag and Fe 3 O 4 20 parts of fine powder and 10 parts of water glass solution.
Wherein the copper slag is metallurgical industry slag, and the average grain diameter of the copper slag is less than 74 mu m; fe 3 O 4 The fine powder is chemically pure, has an average particle size of less than 45 μm, and has a specific gravity of more than 1.30g/cm 3 。
The coatings prepared in example 3 and comparative examples 1 to 2 were tested using high temperature infrared emissivity test equipment:
the test results are shown in table 1:
table 1 results of performance test of example 3 and comparative examples 1 to 2
As can be seen from the data in Table 1, under the condition of keeping the temperature of 1200 ℃ for 3h, the high-emissivity infrared radiation coating based on the copper smelting slag prepared by the invention has the average emissivity of 0.75-2.5 mu m wave band of 0.94; moreover, the coating does not generate the phenomena of peeling, cracking and falling after being subjected to a 1100 ℃ water-cooling thermal shock test for 20 times. The coating of comparative example 1, however, incorporated iron oxide in addition to the copper slag, although a small portion of the iron oxide was converted to Fe during heating 3 O 4 The improvement of the emissivity of the wave band of 0.75 to 2.5 mu m is limited; and common silica sol is selected as a bonding agent, the bonding between the coating and the refractory material substrate is limited, and cracks and local peeling can occur after 7 times of thermal shock. The coating of comparative example 2 introduced Fe in addition to the copper slag 3 O 4 Fine powder, which can improve the emissivity of a wave band of 0.75 to 2.5 mu m to a certain extent; even if water glass is used as a bonding agent, the coating begins to crack and partially fall off after water-cooling thermal shock is repeated for 11 times. The modified iron scale introduced by the technical scheme contains a large amount of components capable of forming spinel, and can form mixed spinel such as orthospinel MgAl 2 O 4 、MgCr 2 O 4 Inverse spinel MgFe 2 O 4 And Fe 3 O 4 The coating has a large amount of lattice distortion and lattice defects, which promote the enhancement of lattice vibration and the change of instantaneous dipole moment at high temperature, improve the infrared radiation performance of the coating in a 0.75-2.5 mu m waveband, and the emissivity of the coating in the waveband can reach 0.94. And also,the technical scheme adopts the alumina micro powder, the sodium silicate glass powder and 2 parts of Guangxi white mud as a composite combination system, can well solve the problem of combination of the coating and a matrix, and can greatly reduce Fe by appropriate liquid phase in the combination system 3 O 4 Thereby ensuring that the glass plays a role of infrared radiation in an environment of 800-1400 ℃ for a long time.
Claims (10)
1. The high-emissivity infrared radiation coating based on copper smelting slag is characterized by comprising the following preparation raw materials in parts by weight: 58-80 parts of copper smelting slag fine powder, 12-27 parts of modified iron scale fine powder, 3-8 parts of alumina micro powder, 2-5 parts of sodium silicate glass powder, 1-3 parts of Guangxi white mud, 0.5-1.5 parts of sodium silicate powder and 0.5-1 part of ammonium lignosulfonate.
2. The copper smelting slag-based high emissivity infrared radiation coating of claim 1, wherein: the copper smelting slag fine powder is fine powder obtained by grinding residues generated in the process of preparing blister copper by adopting a pyrometallurgical copper smelting process until the particle size is less than 74 mu m; the TFe content is more than or equal to 40 percent; the CuO content is more than or equal to 0.2 percent.
3. The copper smelting slag-based high emissivity infrared radiation coating of claim 1, wherein: the modified iron scale fine powder is fine powder obtained by uniformly mixing 8-18 parts by weight of iron scale fine powder, 3-6 parts by weight of magnesium oxide fine powder and 1-2 parts by weight of waste copper powder, pressing the mixture into a blank under the condition of 50-100 MPa, preserving the heat for 3-6 hours at the temperature of 1000-1400 ℃, naturally cooling the blank along with a furnace, crushing the cooled blank and screening the crushed blank until the particle size is less than 74 mu m.
4. The copper smelting slag-based high emissivity infrared radiation coating of claim 3, wherein: the TFe content in the fine iron scale powder is more than or equal to 70 percent, and the average grain diameter is less than 45 mu m.
5. The copper smelting slag-based high emissivity infrared radiation coating of claim 3, wherein: the MgO content in the magnesium oxide fine powder is more than or equal to 96 percent, and the average grain diameter is less than 45 mu m.
6. The copper smelting slag-based high emissivity infrared radiation coating of claim 3, wherein: the Cu content in the waste copper powder is more than or equal to 90 percent, and the average grain diameter is less than 45 mu m.
7. The copper smelting slag-based high emissivity infrared radiation coating of claim 1, wherein: the average grain diameter of the sodium silicate glass powder is less than 45 mu m; the average grain diameter of the alumina micro powder is less than 3 μm.
8. A method for preparing a high emissivity ir-radiation coating based on copper smelting slag as claimed in claim 1, characterized by the steps of: mixing the preparation raw materials according to a formula to obtain a mixed raw material, adding deionized water into the mixed raw material according to the weight ratio of the mixed raw material to the deionized water of 100: 48-75, and ball-milling for 0.5-3 h in a planetary ball mill to prepare the high-emissivity infrared radiation coating based on the copper smelting slag.
9. The preparation method according to claim 8, wherein the grinding balls in the planetary ball mill are corundum balls, and the ball-to-material ratio is (2-4) to 1.
10. Coating prepared with the coating according to any one of claims 1 to 7, characterized in that the coating is applied to the refractory surface of an industrial furnace, dried naturally for 12 to 24 hours, heat treated at 800 to 1400 ℃ for 2 to 4 hours or heated up to 800 to 1400 ℃ with the industrial furnace to produce a high emissivity infrared radiation coating based on copper smelting slag.
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