CN108977638B - Oriented silicon steel annealing release agent and use method thereof - Google Patents
Oriented silicon steel annealing release agent and use method thereof Download PDFInfo
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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
- C21D1/26—Methods of annealing
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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
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Abstract
The invention discloses an oriented silicon steel annealing separant and a using method thereof. The invention not only limits the weight percentage and the stacking density of the components of the separant, but also limits different particle size proportions, thereby ensuring that high-activity magnesium oxide participates in the bottom layer generation reaction, ensuring certain air permeability among steel coils, enabling the steam in the coils to be uniformly released in the high-temperature annealing process, and preventing the defects of local deformation of the strip steel and color difference and the like caused by steam aggregation due to the blockage of the local steam release. In addition, the shape of basic particles in the MgO isolating agent in a porous sheet shape is limited, when the micro shape of MgO is in a porous sheet shape, the MgO isolating agent has the characteristics of higher reaction activity and lower hydration rate, and the magnesium oxide with the shape type keeps higher activity in a key temperature range of magnesium silicate generation at 900-1100 ℃, is quickly sintered into large-particle MgO along with temperature rise after 1100 ℃, and increases the air permeability of a steel coil due to volume shrinkage.
Description
Technical Field
The invention relates to the technical field of oriented silicon steel manufacturing, in particular to an oriented silicon steel annealing separant and a using method thereof.
Background
At present, for the production of oriented silicon steel, in the decarburization annealing process, a high-temperature annealing separant is required to be coated on the surface of strip steel, which generally takes MgO as the main material and has two main functions: firstly, prevent the steel coil from being interlaminated in the high-temperature annealing processBonding, the second step is to generate Mg by chemical reaction with the oxide film on the surface of the strip steel2SiO4The magnesium silicate bottom layer is used for increasing the surface insulation property of the oriented silicon steel and improving the magnetic property. The characteristics of the magnesia separant are key factors for determining the quality of the magnesium silicate bottom layer on the surface of the strip steel, and the CAA activity value, the hydration rate, the specific surface area and the like of the magnesia separant are key indexes for influencing the bottom layer.
The control difficulty of the magnesium silicate bottom layer of the oriented silicon steel manufactured by the low-temperature process is higher, the requirement on the magnesia separating agent is more strict, and the defects of crystal exposure, color difference, deformation and the like which are easily generated on the surface are chronic in the industry and are closely related to the magnesia separating agent. This is because the moisture release from the magnesium oxide is poorly matched to the temperature during the high temperature annealing process. The coil weight of the steel coil annealed by the oriented silicon steel is generally more than 15 tons, certain temperature difference inevitably exists in the coil in the high-temperature annealing process, and the activity of the magnesium oxide isolating agent, the release of water and the like are required to be comprehensively matched with the temperature of the steel coil and the atmosphere in the cover to realize that the steel coil forms a bottom layer with uniform performance in the high-temperature annealing process, so that the difficulty is very high.
In order to solve the problem of uneven bottom layer, magnesium oxide is generally required to have low hydration rate while ensuring high reactivity, and the aim is to reduce the release amount of water vapor in the annealing process of the steel coil, but the two aspects are mutually contradictory, are not easy to stably control, and have relatively limited adaptability to a process window.
Disclosure of Invention
The invention provides the oriented silicon steel annealing separant and the use method thereof, solves the technical problems of color difference and deformation of the bottom layer of the oriented silicon steel high-temperature annealed steel coil in the prior art, and realizes the technical effect of obtaining the bottom layer quality with uniform color and performance.
The invention provides an oriented silicon steel annealing separant, which comprises the following components: the separant comprises the following components in percentage by weight: MgO is more than 97%, Cl is less than 0.04%, CaO: 0.02-0.06%, B: 300-1000ppm, Fe2O3Less than 0.10 percent and other impurity elements less than 0.10 percent; when ethanol is used as a dispersing solvent, the detection granularity meets the following requirements: particles D1 with a particle size of less than 100 μm70-100% of the components, 10-45% of D1 is particles D2 with the particle size of more than 10 μm and less than 100 μm, 60-85% of D1 is particles D3 with the particle size of less than 10 μm, 25-80% of D1 is particles D4 with the particle size of less than 3 μm, and 3-25% of D1 is particles D5 with the particle size of less than or equal to 1 μm; the quantity proportion of basic particles in the MgO isolating agent in a porous sheet layer state is more than 10 percent; the bulk density V600 is less than 0.58 g/mL.
Furthermore, the hydration rate Ig-Loss of the separant at 200 ℃ is less than 1.8 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 50 and 100 seconds after sintering at 950 to 1050 ℃ for two hours.
Furthermore, the hydration rate Ig-Loss of the separant at 200 ℃ is less than 1.8 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 50 and 100 seconds after sintering at 1000 ℃ for two hours.
Further, the sintering temperature of the magnesium oxide in the separant during the manufacturing process is less than 1090 ℃.
The invention provides a using method of an oriented silicon steel annealing separant, which comprises the following steps:
mixing the oriented silicon steel annealing separant with water according to the weight percentage of 1:7-10 to prepare slurry;
uniformly coating the slurry on the surface of the strip steel, and drying, wherein the coating amount is controlled to be 4-8g per square meter;
and carrying out high-temperature annealing on the strip steel.
Further, the oriented silicon steel annealing separant and water are mixed according to the weight percentage of 1:7-10 to prepare slurry, and the slurry comprises the following components:
mixing the oriented silicon steel annealing separant with water according to the weight percentage of 1: 7-10;
adding borax and TiO into the mixed solution2An additive to make the slurry.
Further, the weight percentage of the borax is 0.2-1%; the TiO is2The weight percentage of the additive is 2-5%.
Further, the weight percentage of the borax is 0.5%; the TiO is2The weight percentage of the additive is 3%.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
the invention not only limits the weight percentage and the stacking density of the components of the separant, but also limits different particle size proportions of the magnesium oxide, thereby ensuring that the high-activity magnesium oxide participates in the bottom layer generation reaction, ensuring certain air permeability among steel coils, ensuring that the steam in the coils can be uniformly released in the high-temperature annealing process, and preventing the defects of local deformation of the strip steel caused by the blockage of the local steam release, color difference caused by steam aggregation and the like. In addition, the shape of basic particles in the MgO isolating agent in a porous sheet shape is limited, when the micro shape of MgO is in a porous sheet shape, the MgO isolating agent has the characteristics of higher reaction activity and lower hydration rate, and the magnesium oxide with the shape type keeps higher activity in a key temperature range of magnesium silicate generation at 900-1100 ℃, is quickly sintered into large-particle MgO along with temperature rise after 1100 ℃, and increases the air permeability of a steel coil due to volume shrinkage. The oriented silicon steel annealing separant provided by the invention can obtain the quality of a homogeneous bottom layer with uniform color, improves the uniformity of the bottom layer of the whole steel coil, can inhibit the occurrence of the defect of local deformation of strip steel annealing, and is particularly suitable for producing high-magnetic-induction oriented silicon steel by a low-temperature process.
Drawings
FIG. 1 is a schematic view of the shape of an annealing separator for oriented silicon steel according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for using the oriented silicon steel annealing release agent according to the embodiment of the present invention.
Detailed Description
The embodiment of the invention provides the oriented silicon steel annealing separant and the use method thereof, solves the technical problems of color difference and deformation of the bottom layer of the oriented silicon steel high-temperature annealed steel coil in the prior art, and realizes the technical effect of obtaining the bottom layer quality with uniform color and performance.
In order to solve the above problems, the technical solution in the embodiments of the present invention has the following general idea:
the embodiment of the invention not only limits the weight percentage and the bulk density of the components of the separant, but also limits different particle size proportions of the magnesium oxide, thereby ensuring that the high-activity magnesium oxide participates in the bottom layer generation reaction, ensuring certain air permeability among steel coils, enabling the water vapor in the coils to be uniformly released in the high-temperature annealing process, and preventing the defects of local deformation of the strip steel and color difference and the like caused by water vapor aggregation due to the blockage of the local water vapor release. In addition, the shape of basic particles in the MgO isolating agent in a porous sheet shape is limited, when the micro shape of MgO is in a porous sheet shape, the MgO isolating agent has the characteristics of higher reaction activity and lower hydration rate, and the magnesium oxide with the shape type keeps higher activity in a key temperature range of magnesium silicate generation at 900-1100 ℃, is quickly sintered into large-particle MgO along with temperature rise after 1100 ℃, and increases the air permeability of a steel coil due to volume shrinkage. The oriented silicon steel annealing separant provided by the embodiment of the invention can obtain the quality of a homogeneous bottom layer with uniform color, improves the uniformity of the bottom layer of the whole steel coil, can inhibit the occurrence of the local deformation defect of strip steel annealing, and is particularly suitable for producing high-magnetic-induction oriented silicon steel by a low-temperature process.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.
Referring to fig. 1, the oriented silicon steel annealing release agent provided by the embodiment of the invention comprises: the separant comprises the following components in percentage by weight: MgO is more than 97%, Cl is less than 0.04%, CaO: 0.02-0.06%, B: 300-1000ppm, Fe2O3Less than 0.10 percent and other impurity elements less than 0.10 percent; when ethanol is used as a dispersing solvent, the detection granularity meets the following requirements: 70-100% of the total composition is particles D1 with a particle size of less than 100 μm, 10-45% of D1 is particles D2 with a particle size of more than 10 μm and less than 100 μm, 60-85% of D1 is particles D3 with a particle size of less than 10 μm, 25-80% of D1 is particles D4 with a particle size of less than 3 μm, and 3-25% of D1 is particles D5 with a particle size of less than or equal to 1 μm; the quantity proportion of the basic particles in the MgO isolating agent in the form of porous sheet layers is more than 10 percent (electron microscope multiplied by 20000 statistics); the bulk density (V600) is less than 0.58 g/mL.
Furthermore, the hydration rate Ig-Loss (200 ℃) of the separant is less than 1.8 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 50 and 100 seconds after sintering for two hours at 950 to 1050 ℃, so as to ensure that the MgO still has certain reaction activity in a high-temperature state and is not burned.
Furthermore, the hydration rate Ig-Loss (200 ℃) of the separant is less than 1.8 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 50 and 100 seconds after sintering at 1000 ℃ for two hours.
In the embodiment, the sintering temperature of the magnesia in the separant during the manufacturing process is less than 1090 ℃, so as to ensure that the shape and the activity of the produced magnesia particles meet the requirements.
It should be noted that the magnesium oxide in the annealing separator for oriented silicon steel provided by the embodiment of the present invention may be a mixture of 1 or more than 2 different magnesium oxides. In this case, the sintering temperature of the at least one magnesium oxide in the release agent during manufacture is less than 1090 ℃.
Referring to fig. 2, the use method of the oriented silicon steel annealing release agent provided by the embodiment of the invention comprises the following steps:
step S110: mixing the oriented silicon steel annealing separant with water according to the weight percentage of 1:7-10 to prepare slurry;
this step is explained in detail:
mixing the oriented silicon steel annealing separant with water according to the weight percentage of 1: 7-10;
adding borax and TiO into the mixed solution2Additive to prepare slurry, so as to reduce the reaction temperature point of the slurry and the silicon dioxide on the surface of the strip steel and further ensure that Mg can be generated on the surface of the strip steel through reaction2SiO4A magnesium silicate bottom layer.
In the embodiment, the weight percentage of the borax is 0.2-1%; TiO22The weight percentage of the additive is 2-5%.
Further, the weight percentage of borax is 0.5%; TiO22The weight percentage of the additive is 3%.
Step S120: and uniformly coating the slurry on the surface of the strip steel, and drying, wherein the coating amount is controlled to be 4-8 g/square meter, so as to ensure the MgO amount required by the bottom layer generation reaction and ensure a certain air gap amount between layers.
Step S130: and carrying out high-temperature annealing on the strip steel.
Example 1
The 0.30mm oriented silicon steel is produced by adopting a low-temperature process. When ethanol is used as a dispersing solvent, the detection granularity meets the following requirements: the particles D2 with the particle size of more than 10 μm and less than 100 μm account for 15-35% of D1, the particles D4 with the particle size of less than 3 μm account for 50% of D1, the particles D5 with the particle size of less than or equal to 1 μm account for 17% of D1, and the number proportion of the basic particles in the MgO isolating agent in the form of porous sheet layers is more than 10% (electron microscope multiplied by 20000 statistics); the bulk density (V600) is less than 0.45g/mL, the hydration rate Ig-Loss (200 ℃) is less than 1.0 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 60 and 75 seconds after sintering at 1000 ℃ for two hours.
The separant comprises the following components in percentage by weight: 98% of MgO, less than 0.03% of Cl, 0.052% of CaO, B: 600ppm, 0.04% Fe2O3, and < 0.10% of other impurity elements.
Mixing the release agent and water according to the weight percentage of 1:9, adding 0.5 percent of borax and 3 percent of TiO2 additive into the mixed solution to prepare slurry, uniformly coating the slurry on the surface of the strip steel, drying the slurry, controlling the coating amount to be 6 g/square meter, and then carrying out high-temperature annealing.
Example 1 mainly refers to the application of oriented silicon steel in the 0.3mm specification, which includes 6 MgO embodiments (embodiments 1 to 6) within the scope of the present invention and 3 comparative examples (comparative examples 1 to 3) not within the scope of the present invention.
The effects of embodiment 1 are shown in table 1.
TABLE 1 implementation effect of the invention on 0.3 mm-sized oriented silicon steel and comparative example
Note that in Table 1, "○" indicates that the bottom layer has a moderate thickness, is very uniform, has no color difference and has no crystal exposure defect, "" very good "indicates that the bottom layer has a slightly thin thickness, is uniform, has no color difference and has a slight crystal exposure defect," "O" indicates that the bottom layer has a thick thickness, is uniform, has a color difference and has a slight crystal exposure defect, and "" good "indicates that the bottom layer has a non-uniform thickness, has a severe color difference and has a large area of crystal exposure defect.
The results in table 1 show that when the low-temperature process is used for producing the 0.30mm oriented silicon steel, the bottom layer quality is formed uniformly and the electromagnetic performance is excellent under the application of the oriented silicon steel annealing separant provided by the embodiment of the invention.
Example 2
The 0.23mm oriented silicon steel is produced by adopting a low-temperature process. When ethanol is used as a dispersing solvent, the detection granularity meets the following requirements: the particles D2 with the particle size of more than 10 μm and less than 100 μm account for 10-40% of D1, the particles D4 with the particle size of less than 3 μm account for 50% of D1, the particles D5 with the particle size of less than or equal to 1 μm account for 3-25% of D1, and the number proportion of the basic particles in the MgO isolating agent in the form of porous sheet layers is more than 15% (electron microscope multiplied by 20000 statistics); the bulk density (V600) is less than 0.50g/mL, the hydration rate Ig-Loss (200 ℃) is less than 1.0 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 60 and 80 seconds after sintering at 1000 ℃ for two hours.
The separant comprises the following components in percentage by weight: 98% of MgO, less than 0.03% of Cl, 0.052% of CaO, B: 600ppm, Fe2O30.04% and other impurity elements less than 0.10%.
Mixing the separant and water in a weight ratio of 1:9, and adding 0.5% of borax and 3% of TiO into the mixed solution2And (3) preparing an additive into slurry, uniformly coating the slurry on the surface of the strip steel, drying, controlling the coating amount to be 7 g/square meter, and then carrying out high-temperature annealing.
Example 2 mainly refers to the application of oriented silicon steel in the 0.23mm specification, which includes 6 MgO embodiments (embodiments 7 to 12) within the scope of the present invention and 3 comparative examples (comparative examples 4 to 6) not within the scope of the present invention.
The effects of embodiment 2 are shown in Table 2.
TABLE 2 implementation effect and comparative example of the invention on 0.23 mm-sized oriented silicon steel
note 2 in table 2, "○" indicates that the bottom layer has a moderate thickness, is very uniform, has no color difference, and has no crystal defect, ◎ ". circleincircle" indicates that the bottom layer has a slightly thin thickness, is uniform, has no color difference, and has a slight crystal defect, ". o" indicates that the bottom layer has a thick thickness, is uniform, has a color difference, and has a slight crystal defect, and ". laterals" indicates that the bottom layer has a non-uniform thickness, has a severe color difference, and has a large area crystal defect.
The results in table 2 show that when the low-temperature process is used for producing the 0.23mm oriented silicon steel, the bottom layer quality is formed uniformly and the electromagnetic performance is excellent under the application of the oriented silicon steel annealing separant provided by the embodiment of the invention.
Embodiment 3
The 0.18mm oriented silicon steel is produced by adopting a low-temperature process. When ethanol is used as a dispersing solvent, the detection granularity meets the following requirements: the particles D2 with the particle size of more than 10 μm and less than 100 μm account for 10-40% of D1, the particles D4 with the particle size of less than 3 μm account for 50% of D1, the particles D5 with the particle size of less than or equal to 1 μm account for 3-25% of D1, and the number proportion of the basic particles in the MgO isolating agent in the form of porous sheet layers is more than 15% (electron microscope multiplied by 20000 statistics); the bulk density (V600) is less than 0.50g/mL, the hydration rate Ig-Loss (200 ℃) is less than 1.0 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 60 and 80 seconds after sintering at 1000 ℃ for two hours.
The separant comprises the following components in percentage by weight: 98% of MgO, 0.02% of Cl, 0.032% of CaO, B: 600ppm, Fe2O30.04% and other impurity elements less than 0.10%.
Mixing the separant and water in a weight ratio of 1:9, and adding 0.5% of borax and 3% of TiO into the mixed solution2And (3) preparing an additive into slurry, uniformly coating the slurry on the surface of the strip steel, drying, controlling the coating amount to be 6 g/square meter, and then carrying out high-temperature annealing.
Example 3 mainly refers to the application of 0.18 mm-sized oriented silicon steel, which includes 6 MgO embodiments (embodiments 13-18) within the scope of the present invention and 3 comparative examples (comparative examples 7-9) not within the scope of the present invention.
The effects of embodiment 3 are shown in Table 3.
TABLE 3 implementation effect and comparative example of the invention on 0.18 mm-sized oriented silicon steel
Note 3 in Table 3, "○" indicates that the bottom layer has a moderate thickness, is very uniform, has no color difference and has no crystal defect, while ". circleincircle" indicates that the bottom layer has a slightly thin thickness, is uniform, has no color difference and has a slight crystal defect, ". o" indicates that the bottom layer has a thick thickness, is uniform, has a color difference and has a slight crystal defect, and ". laterals" indicates that the bottom layer has a non-uniform thickness, has a severe color difference and has a large area crystal defect.
The results in table 3 show that when the low-temperature process is used to produce the 0.18mm oriented silicon steel, the bottom layer is formed uniformly and the electromagnetic performance is excellent under the application of the annealing separant for oriented silicon steel provided by the embodiment of the invention.
According to the embodiment, the oriented silicon steel annealing separant provided by the embodiment of the invention has a good using effect on the low-temperature high-magnetic-induction oriented silicon steel with the specification of 0.18-0.30 mm, effectively overcomes the defects of surface color difference, deformation and the like, and obtains a uniform bottom layer and excellent electromagnetic performance.
[ technical effects ] of
1. The embodiment of the invention not only limits the weight percentage and the bulk density of the components of the separant, but also limits different particle size proportions of the magnesium oxide, thereby ensuring that the high-activity magnesium oxide participates in the bottom layer generation reaction, ensuring certain air permeability among steel coils, enabling the water vapor in the coils to be uniformly released in the high-temperature annealing process, and preventing the defects of local deformation of the strip steel and color difference and the like caused by water vapor aggregation due to the blockage of the local water vapor release. In addition, the shape of basic particles in the MgO isolating agent in a porous sheet shape is limited, when the micro shape of MgO is in a porous sheet shape, the MgO isolating agent has the characteristics of higher reaction activity and lower hydration rate, and the magnesium oxide with the shape type keeps higher activity in a key temperature range of magnesium silicate generation at 900-1100 ℃, is quickly sintered into large-particle MgO along with temperature rise after 1100 ℃, and increases the air permeability of a steel coil due to volume shrinkage. The oriented silicon steel annealing separant provided by the embodiment of the invention can obtain the quality of a homogeneous bottom layer with uniform color, improves the uniformity of the bottom layer of the whole steel coil, can inhibit the occurrence of the local deformation defect of strip steel annealing, and is particularly suitable for producing high-magnetic-induction oriented silicon steel by a low-temperature process.
2. The hydration rate Ig-Loss (200 ℃) of the separant is less than 1.8 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 50 and 100 seconds after sintering for two hours at 950 to 1050 ℃, thereby ensuring that the MgO can also have certain reaction activity in a high-temperature state without being burned.
3. The sintering temperature of the magnesium oxide in the separant in the manufacturing process is less than 1090 ℃, so that the shape and the activity of the generated magnesium oxide particles meet the requirements.
4. In the use method of the oriented silicon steel annealing release agent, the coating amount of the slurry is controlled to be 4-8 g/square meter, so that the MgO amount required by bottom layer generation reaction is ensured, and a certain amount of air gaps are ensured between layers.
5. In the using method of the oriented silicon steel annealing separant, borax and TiO are added into the mixed solution2The additive is prepared into slurry, so that the reaction temperature point of the slurry and the silicon dioxide on the surface of the strip steel is reduced, and the Mg can be generated by the reaction on the surface of the strip steel2SiO4A magnesium silicate bottom layer.
The oriented silicon steel annealing separant provided by the embodiment of the invention has the advantages of high adaptability, widening of a post-process window and improvement of the surface yield, and gives consideration to the factor indexes such as activity, hydration rate and air permeability of the magnesia separant.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An oriented silicon steel annealing release agent is characterized by comprising: the separant comprises the following components in percentage by weight: MgO is more than 97%, Cl is less than 0.04%, CaO: 0.02-0.06%, B: 300-1000ppm, Fe2O3Less than 0.10 percent and other impurity elements less than 0.10 percent; when ethanol is used as a dispersing solvent, the detection granularity meets the following requirements: 70-100% of the total composition is particles D1 with a particle size of less than 100 μm, 10-45% of D1 is particles D2 with a particle size of more than 10 μm and less than 100 μm, 60-85% of D1 is particles D3 with a particle size of less than 10 μm, 25-80% of D1 is particles D4 with a particle size of less than 3 μm, and 3-25% of D1 is particles D5 with a particle size of less than or equal to 1 μm; the quantity proportion of basic particles in the MgO isolating agent in a porous sheet layer state is more than 10 percent; the bulk density V600 is less than 0.58 g/mL; the hydration rate Ig-Loss of the separant at 200 ℃ is less than 1.8 percent, and the activity CAA of 40 percent citric acid at 30 ℃ is between 50 and 100 seconds after sintering at 950 to 1050 ℃ for two hours.
2. The oriented silicon steel annealing separator as set forth in claim 1, wherein the 200 ℃ hydration ratio Ig-Loss of the separator is less than 1.8%, and the 40% citric acid 30 ℃ activity CAA after sintering at 1000 ℃ for two hours is between 50 and 100 seconds.
3. The oriented silicon steel annealing separator of any one of claims 1-2, wherein the sintering temperature of the magnesium oxide in the separator during manufacturing is less than 1090 ℃.
4. The use method of the oriented silicon steel annealing release agent is characterized by comprising the following steps:
mixing the oriented silicon steel annealing release agent of any one of claims 1-3 with water in a weight ratio of 1:7-10 to form a slurry;
uniformly coating the slurry on the surface of the strip steel, and drying, wherein the coating amount is controlled to be 4-8g per square meter;
and carrying out high-temperature annealing on the strip steel.
5. The use method of claim 4, wherein the oriented silicon steel annealing separator of any one of claims 1 to 3 is mixed with water in a weight ratio of 1:7-10 to form a slurry, comprising:
mixing the oriented silicon steel annealing separator of any one of claims 1-3 with water in a weight ratio of 1: 7-10;
adding borax and TiO into the mixed solution2An additive to make the slurry.
6. The use of claim 5, wherein the borax is present in an amount of 0.2-1% by weight; the TiO is2The weight percentage of the additive is 2-5%.
7. The use of claim 6, wherein the borax is present in an amount of 0.5% by weight; the TiO is2The weight percentage of the additive is 3%.
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| CN109880982A (en) * | 2019-02-28 | 2019-06-14 | 首钢智新迁安电磁材料有限公司 | A method of improving orientation silicon steel MgO interleaving agent coating quality |
| CN111186850B (en) * | 2019-12-27 | 2022-12-16 | 南京宝淳新材料科技有限公司 | Magnesium oxide for oriented silicon steel annealing separant and preparation method thereof |
| CN111302366B (en) * | 2020-02-26 | 2023-12-01 | 南京宝淳新材料科技有限公司 | Magnesia for grain-oriented electromagnetic steel sheet annealing isolating agent |
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