CN111910047A - Synthetic slag for smelting titanium-containing H-shaped steel and preparation method thereof - Google Patents
Synthetic slag for smelting titanium-containing H-shaped steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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Abstract
The invention relates to a synthetic slag for smelting titanium-containing H-shaped steel and a preparation method thereof, wherein the synthetic slag comprises the following components in percentage by weight: CaO: 55-65%, MgO: 8% -12.5% of Al2O3：12％～18％，CaF2：8％～12.5％，SiO2Less than or equal to 4 percent, and ash content and water content less than or equal to 2.5 percent. The invention has the beneficial effects that: compared with the traditional refining slag, the titanium-containing H-shaped steel refining slag can effectively remove free oxygen and nonmetal impurities in molten steel and simultaneously improve and stabilize the recovery rate of titanium.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to synthetic slag for smelting titanium-containing H-shaped steel and a preparation method thereof.
Background
The strength, toughness and welding performance of the steel can be improved by adding a trace amount of titanium into the molten steel. Since Ti is chemically active and readily forms a compound with C, N, O, S or the like, the recovery rate of titanium in steel is low and unstable. In order to ensure a high and stable recovery rate of titanium, better synthetic slag must be adopted in the smelting process of steel to remove free oxygen in molten steel and more effectively remove non-metallic inclusions in the molten steel.
Chinese patent application CN105779700A discloses a steel smelting synthetic slag and a production method thereof, which comprises the following components by weight percent: CaO 61%, Al2O3 20％、SiO2≤3％、Fe2O3≤1％、MgO≤1％、P≤0.03％、S≤0.01％、CaF2Less than or equal to 2.5 percent and less than or equal to 10 percent of water; the synthetic slag is characterized by difficult crushing and pulverization, good fluidity, less material loss, good melting effect and favorable environmental protection. Chinese patent application CN105483329A discloses a refining synthetic slag for improving the refining quality of steel grades and a preparation method thereof, the components of the refining synthetic slag by weight percentage are as follows: 35-75% of dolomite powder, 25-55% of bauxite, 1-10% of active magnesium oxide, 5-15% of pure calcium aluminate cement and 1-10% of additive; the method is characterized by low melting point of the refined synthetic slag, high purity and simple whole set of preparation method. The above synthetic slag has insufficient ability to remove free oxygen and inclusions in molten steel, and cannot satisfy the production requirements of titanium-containing H-shaped steel, and the above synthetic slag also cannot keep the recovery rate of titanium stable.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the special synthetic slag which is used in the smelting production process of the titanium-containing H-shaped steel and can improve and stabilize the recovery rate of titanium.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the synthetic slag for smelting titanium-containing H-shaped steel comprises the following components in percentage by weight: CaO: 55-65%, MgO: 8 to 12.5 percent of Al2O3：12％～18％、CaF2：8％～12.5％、SiO2Less than or equal to 4 percent, and ash content and water content less than or equal to 2.5 percent.
According to the titanium-containing H-shaped steel smelting synthetic slag provided by the invention, preferably, the titanium-containing H-shaped steel smelting synthetic slag comprises the following components in percentage by weight: CaO: 56.25% -61.55%, MgO: 9.12 to 11.26 percent of Al2O3：14.32％～16.58％、CaF2：9.15％～11.55％、SiO2Less than or equal to 2.95 percent, and ash content and water content less than or equal to 1.9 percent.
Further preferably, the titanium-containing H-shaped steel smelting synthetic slag comprises the following components in percentage by weight: CaO: 60.23%, MgO: 10.55% of Al2O3：14.51％、CaF2：10.21％、SiO2: 2.53%, moisture + ash: 1.32 percent.
A preparation method of synthetic slag for smelting titanium-containing H-shaped steel comprises the following steps:
1) taking 42-52% of active lime, 18-28% of light-burned dolomite, 9-15% of fluorite and 12-20% of bauxite clinker according to weight percentage, mixing uniformly and crushing to prepare synthetic slag powder; preferably, the synthetic slag is crushed to a particle size of less than 0.05 mm;
2) uniformly mixing the synthetic slag powder prepared in the step 1) with a foam ball to prepare a mixed raw material, wherein the volume percentage of the synthetic slag to the foam ball is (4: 1) to (5: 1) (ii) a The main component of the foam ball is polyethylene which can be purchased commercially, and the foam ball with the granularity of 2-3 mm is preferably selected;
3) pressing the mixed raw material prepared in the step 2) into synthetic slag balls; preferably pressing into synthetic slag balls with the diameter of 5-7 cm, and optionally pressing by a ball press;
4) placing the synthetic slag ball prepared in the step 3) into a heating furnace, and heating for 55-65 minutes to prepare the honeycomb-shaped titanium-containing H-shaped steel smelting synthetic slag; the heating temperature is preferably 450-480 ℃.
According to the preparation method of the synthetic slag for smelting the titanium-containing H-shaped steel, in the step 1), preferably, 45-50% of active lime, 20-25% of light-burned dolomite, 10-14% of fluorite and 14-19% of bauxite clinker are taken according to weight percentage.
According to the method for preparing the synthetic slag for smelting the titanium-containing H-shaped steel, in the step 1), 48% of active lime, 23% of light-burned dolomite, 11% of fluorite and 18% of bauxite clinker are taken according to weight percentage.
The invention also provides application of the synthetic slag for smelting the titanium-containing H-shaped steel in smelting the titanium-containing H-shaped steel molten steel.
According to the optimization of the invention, the usage amount of the synthetic slag for smelting the titanium-containing H-shaped steel is 2-2.5 kg per ton of steel, and 1.5-2 kg per ton of steel is added along with steel flow in the molten steel tapping process, and the pre-melting slag comprises the following components in percentage by weight: CaO: 52 to 58 percent of Al2O3：45％～53％、SiO2≤3％、TFe≤2％。
The synthetic slag of the invention adopts a component and a preparation process which are different from the traditional refining slag, and prepares the special synthetic slag suitable for smelting titanium-containing H-shaped steel at a proper heating temperature and heating time.
The invention has the beneficial effects that: compared with the traditional refining slag, the titanium-containing H-shaped steel can more effectively remove free oxygen and non-metallic inclusions in molten steel and simultaneously improve and stabilize the recovery rate of titanium.
Detailed Description
The invention is further illustrated with reference to the following examples, without limiting the scope of the invention.
Active lime: CaO > 90 wt%, SiO2Less than or equal to 3wt percent, and ash content and water content less than or equal to 3wt percent.
Light-burned dolomite: CaO: 45-55 wt%, MgO: 40 to 50 weight percent of SiO2Less than or equal to 3wt percent, and ash content and water content less than or equal to 3wt percent.
Bauxite chamotte: al (Al)2O3：78wt％～85wt％，SiO2: 1-12 wt%, CaO: 1 wt% -3 wt%, MgO: 1 wt% -3 wt%, ash content and water content less than or equal to 3 wt%, and P and S less than or equal to 1 wt%.
Fluorite: high quality, CaF2＞95wt％，SiO2≤4wt％，Ash content and water content are less than or equal to 1 wt%.
Example 1
The preparation method of the synthetic slag for smelting the titanium-containing H-shaped steel comprises the following steps:
(1) uniformly mixing 43% of active lime, 27% of light-burned dolomite, 13% of fluorite and 17% of bauxite clinker in percentage by weight, and crushing the mixture until the particle size is less than 0.05mm to obtain synthetic slag powder;
(2) uniformly mixing the synthetic slag powder prepared in the step (1) with a foam ball with the granularity of 2-3 mm, wherein the volume ratio of the synthetic slag powder to the foam ball is 4: 1;
(3) pressing the mixed raw materials prepared in the step (2) into synthetic slag balls of 5-7 cm in a ball press;
(4) and (4) placing the synthetic slag ball prepared in the step (3) into a heating furnace, and preserving the heat for 55 minutes at the temperature of about 470 ℃ to prepare the honeycomb-shaped synthetic slag for smelting the titanium-containing H-shaped steel.
Through detection, the prepared titanium-containing H-shaped steel smelting synthetic slag comprises the following components (in percentage by weight): CaO: 56.52%, MgO: 12.45% of Al2O3：13.96％，SiO2：2.57％，CaF2: 12.49%, ash + moisture 1.36%, and P + S0.65%.
Example 2
The preparation method of the synthetic slag for smelting the titanium-containing H-shaped steel comprises the following steps:
(1) uniformly mixing 46% of active lime, 25% of light-burned dolomite, 12% of fluorite and 17% of bauxite clinker according to weight percentage, and then crushing until the grain size is less than 0.05mm to obtain synthetic slag powder;
(2) uniformly mixing the synthetic slag powder prepared in the step (1) with a foam ball with the granularity of 2-3 mm, wherein the volume ratio of the synthetic slag powder to the foam ball is 4.3: 1;
(3) pressing the mixed raw materials prepared in the step (2) into synthetic slag balls of 5-7 cm in a ball press;
(4) and (4) placing the synthetic slag ball prepared in the step (3) into a heating furnace, and preserving the heat for 60 minutes at the temperature of about 480 ℃ to prepare the honeycomb-shaped synthetic slag for smelting the titanium-containing H-shaped steel.
Through detection, the prepared titanium-containing H-shaped steel smelting alloyThe components for forming the slag are as follows (all in percentage by weight): CaO: 58.62%, MgO: 11.21% of Al2O3：14.19％，SiO2：2.58％，CaF2: 11.41%, ash + moisture 1.33%, and P + S0.66%.
Example 3
The preparation method of the synthetic slag for smelting the titanium-containing H-shaped steel comprises the following steps:
(1) mixing 48% of active lime, 23% of light-burned dolomite, 11% of fluorite and 18% of bauxite clinker uniformly according to weight percentage, and then crushing the mixture until the particle size is less than 0.05mm to obtain synthetic slag powder;
(2) uniformly mixing the synthetic slag powder prepared in the step (1) with a foam ball with the granularity of 2-3 mm, wherein the volume ratio of the synthetic slag powder to the foam ball is 4.5: 1;
(3) pressing the mixed raw materials prepared in the step (2) into synthetic slag balls of 5-7 cm in a ball press;
(4) and (4) placing the synthetic slag ball prepared in the step (3) into a heating furnace, and preserving the heat for 65 minutes at the temperature of about 450 ℃ to prepare the honeycomb-shaped synthetic slag for smelting the titanium-containing H-shaped steel.
Through detection, the prepared titanium-containing H-shaped steel smelting synthetic slag comprises the following components (in percentage by weight): CaO: 60.23%, MgO: 10.55% of Al2O3：14.51％，CaF2：10.21％，SiO2: 2.53%, moisture + ash: 1.32%, and P + S is 0.65%.
Example 4
The preparation method of the synthetic slag for smelting the titanium-containing H-shaped steel comprises the following steps:
(1) uniformly mixing 50% of active lime, 22% of light-burned dolomite, 12% of fluorite and 16% of bauxite clinker according to weight percentage, and then crushing until the grain size is less than 0.05mm to obtain synthetic slag powder;
(2) uniformly mixing the synthetic slag powder prepared in the step (1) with a foam ball with the granularity of 2-3 mm, wherein the volume percentage of the synthetic slag powder to the foam ball is 4.7: 1;
(3) pressing the mixed raw materials prepared in the step (2) into synthetic slag balls of 5-7 cm in a ball press;
(4) and (4) placing the synthetic slag ball prepared in the step (3) into a heating furnace, and preserving the heat for 60 minutes at the temperature of about 470 ℃ to prepare the honeycomb-shaped synthetic slag for smelting the titanium-containing H-shaped steel.
Through detection, the prepared titanium-containing H-shaped steel smelting synthetic slag comprises the following components (in percentage by weight): CaO: 61.66%, MgO: 9.85% of Al2O3：13.13％，SiO2：2.55％，CaF2: 10.83%, ash + moisture 1.32%, and P + S0.66%.
Example 5
The preparation method of the synthetic slag for smelting the titanium-containing H-shaped steel comprises the following steps:
(1) uniformly mixing 51% of active lime, 20% of light-burned dolomite, 11% of fluorite and 18% of bauxite clinker according to weight percentage, and then crushing until the grain size is less than 0.05mm to obtain synthetic slag powder;
(2) uniformly mixing the synthetic slag powder prepared in the step (1) with a foam ball with the granularity of 2-3 mm, wherein the volume percentage of the synthetic slag powder to the foam ball is 5: 1;
(3) pressing the mixed raw materials prepared in the step (2) into synthetic slag balls of 5-7 cm in a ball press;
(4) and (4) placing the synthetic slag ball prepared in the step (3) into a heating furnace, and preserving the heat for 60 minutes at the temperature of about 460 ℃ to prepare the honeycomb-shaped titanium-containing H-shaped steel smelting synthetic slag.
Through detection, the prepared titanium-containing H-shaped steel smelting synthetic slag comprises the following components (in percentage by weight): CaO: 62.11%, MgO: 9.03%, Al2O3：13.88％，SiO2：2.52％，CaF2: 12.49%, ash + moisture 1.36%, and P + S0.65%.
Comparative example 1
The traditional refining slag comprises the following specific components (in percentage by weight):
CaO：52.62％，Al2O3：39.43％，MgO：3.01％，SiO2：2.19％，P+S＝0.22％，
ash content + moisture content: 2.53 percent.
Comparative example 2
The traditional refining slag comprises the following specific components (in percentage by weight):
CaO：50.33％，Al2O3：40.65％，MgO：3.45％，SiO2：2.67％，P+S＝0.25％，
ash + moisture 2.65%.
Comparative example 3
The traditional refining slag comprises the following specific components (in percentage by weight):
CaO：48.96％，Al2O3：41.88％，MgO：3.82％，SiO2：2.47％，P+S＝0.26％，
ash + moisture 2.61%.
Performance test of synthetic slag for smelting titanium-containing H-shaped steel
Testing titanium-containing H-shaped steel molten steel:
the titanium-containing H-shaped steel molten steel 1 is tested, and the smelting components are as follows (all in percentage by weight):
0.16 percent of C, 0.23 percent of Si, 0.68 percent of Mn, 0.032 percent of P, 0.025 percent of S, 0.002 percent of Ti (residual), and the balance of Fe.
The titanium-containing H-shaped steel molten steel 2 is tested, and the smelting components are as follows (all in percentage by weight):
0.16 percent of C, 0.21 percent of Si, 0.71 percent of Mn, 0.028 percent of P, 0.023 percent of S, 0.002 percent of Ti (residual), and the balance of Fe.
The titanium-containing H-shaped steel molten steel 3 is tested, and the smelting components are as follows (all in percentage by weight):
0.17 percent of C, 0.22 percent of Si, 0.70 percent of Mn, 0.026 percent of P, 0.026 percent of S, 0.003 percent of Ti (residual), and the balance of Fe.
The titanium-containing H-shaped steel molten steel 4 is tested, and the smelting components are as follows (all in percentage by weight):
0.18 percent of C, 0.22 percent of Si, 0.72 percent of Mn, 0.031 percent of P, 0.021 percent of S, 0.002 percent of Ti (residual), and the balance of Fe.
The titanium-containing H-shaped steel molten steel 5 is tested and comprises the following components (in percentage by weight):
0.17% of C, 0.25% of Si, 0.72% of Mn, 0.033% of P, 0.021% of S, 0.003% of Ti (residual), and the balance of Fe.
The titanium-containing H-shaped steel molten steel 6 is tested and comprises the following components (in percentage by weight):
c:0.16 percent of Si, 0.26 percent of Mn, 0.70 percent of P, 0.029 percent of S, 0.020 percent of Ti (the residue), and the balance of Fe.
The titanium-containing H-shaped steel molten steel 7 is tested and comprises the following components (in percentage by weight):
c: 0.17%, Si 0.23%, Mn 0.71%, P0.031%, S0.022%, Ti 0.002% (residual), and the balance Fe.
The titanium-containing H-shaped steel molten steel 8 is tested and comprises the following components (in percentage by weight):
c:0.18 percent of Si, 0.25 percent of Mn, 0.71 percent of P, 0.028 percent of S, 0.024 percent of Ti (residual), and the balance of Fe.
Test example 1
2.5kg of the synthetic slag for smelting the titanium-containing H-shaped steel prepared in the example 1 is applied to each ton of molten steel 1 of the titanium-containing H-shaped steel in a ladle bottom adding mode before steel discharge, 1.5kg of pre-melted slag is added to each ton of steel along with steel flow in the molten steel tapping process, the molten steel of the titanium-containing H-shaped steel enters an argon blowing position at the bottom of a ladle, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all in weight percent): c:0.17 percent of Si, 0.25 percent of Mn, 0.69 percent of P, 0.032 percent of S, 0.022 percent of Ti, 0.024 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 91.83 percent.
Test example 2
2.0kg of the synthetic slag for smelting the titanium-containing H-shaped steel prepared in the example 2 is applied to each ton of molten steel 2 of the titanium-containing H-shaped steel according to a mode of adding the synthetic slag into a ladle bottom before steel discharge, 2kg of pre-melted slag is added into each ton of steel along with steel flow in the molten steel tapping process, the molten steel of the titanium-containing H-shaped steel enters an argon blowing position at the bottom of the ladle, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all in weight percent): c:0.16 percent of Si, 0.23 percent of Mn, 0.71 percent of P, 0.027 percent of S, 0.019 percent of Ti, 0.024 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 92.11 percent.
Test example 3
2kg of the synthetic slag for smelting the titanium-containing H-shaped steel prepared in the example 3 is applied to molten steel 3 containing the titanium-containing H-shaped steel in a test manner that each ton of molten steel is added into a ladle bottom before steel discharge, 1.8kg of pre-melted slag is added into each ton of steel along with steel flow in the molten steel tapping process, the molten steel containing the titanium-containing H-shaped steel enters an argon blowing position at the bottom of the ladle, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all in weight percent): c:0.18 percent of Si, 0.25 percent of Mn, 0.70 percent of P, 0.026 percent of S, 0.022 percent of Ti, 0.026 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 96.82 percent.
Test example 4
2.2kg of the synthetic slag for smelting the titanium-containing H-shaped steel prepared in the example 4 is applied to the titanium-containing H-shaped steel molten steel 4 in a ladle bottom adding mode before steel discharge, 1.6kg of pre-melted slag is added to each ton of steel along with steel flow in the molten steel tapping process, the titanium-containing H-shaped steel molten steel enters an argon blowing position at the bottom of a ladle, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all in weight percent): c:0.18 percent of Ti, 0.23 percent of Si, 0.75 percent of Mn, 0.032 percent of P, 0.019 percent of S, 0.025 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 95.91 percent.
Test example 5
2.3kg of the synthetic slag for smelting the titanium-containing H-shaped steel prepared in the example 5 is applied to the titanium-containing H-shaped steel molten steel 5 in a ladle bottom adding mode before steel discharge, 1.8kg of pre-melted slag is added to each ton of steel along with steel flow in the molten steel tapping process, the titanium-containing H-shaped steel molten steel enters an argon blowing position at the bottom of a ladle, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all in weight percent): c:0.18 percent of Ti, 0.25 percent of Si, 0.73 percent of Mn, 0.032 percent of P, 0.018 percent of S, 0.025 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 91.95 percent.
Comparative test example 1
The traditional refining slag described in the comparative example 1 is added into the molten steel 6 containing titanium H-shaped steel according to the mode of adding 2.5kg per ton of molten steel into the ladle bottom before tapping, and is added with 1.6kg per ton of steel pre-melted slag along with steel flow in the molten steel tapping process, the molten steel containing titanium H-shaped steel enters the position of blowing argon at the bottom of the ladle, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all weight percentage): c:0.16 percent of Si, 0.28 percent of Mn, 0.72 percent of P, 0.028 percent of S, 0.018 percent of Ti, 0.019 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 71.25 percent.
Comparative test example 2
The traditional refining slag described in the comparative example 2 is added into molten steel 7 containing titanium H-shaped steel according to the mode of adding 2.3kg of slag into a ladle bottom before tapping, 1.8kg of pre-melted slag is added into each ton of steel along with steel flow in the molten steel tapping process, the molten steel containing titanium H-shaped steel enters a position for blowing argon gas into the ladle bottom, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all weight percentages): c:0.18 percent of Si, 0.24 percent of Mn, 0.72 percent of P, 0.031 percent of S, 0.020 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 68.45 percent.
Comparative test example 3
The traditional refining slag described in the comparative example 3 is added to molten steel 8 containing titanium H-shaped steel according to the mode of adding 2kg of slag to the ladle bottom before tapping, 2kg of pre-melted slag is added to molten steel per ton of steel along with steel flow in the molten steel tapping process, the molten steel containing titanium H-shaped steel enters the position of blowing argon from the ladle bottom, a titanium iron wire is fed for 80m, and the end point components of the molten steel are (all weight percentages): c: 0.19 percent of Ti, 0.26 percent of Si, 0.72 percent of Mn, 0.028 percent of P, 0.021 percent of S, 0.016 percent of Ti and the balance of Fe, wherein the recovery rate of Ti is 60.55 percent.
Analysis of results
The data of the test examples and the comparative test examples show that the synthetic slag for smelting titanium-containing H-shaped steel can greatly improve the recovery rate of titanium and keep the recovery rate of titanium to be more than 91 percent stably.
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The synthetic slag for smelting the titanium-containing H-shaped steel is characterized by comprising the following components in percentage by weightThe method comprises the following steps: CaO: 55-65%, MgO: 8 to 12.5 percent of Al2O3：12％～18％、CaF2：8％～12.5％、SiO2Less than or equal to 4 percent, and ash content and water content less than or equal to 2.5 percent.
2. The synthetic slag for smelting titanium-containing H-shaped steel according to claim 1, wherein the synthetic slag comprises the following components in percentage by weight: CaO: 56.25% -61.55%, MgO: 9.12 to 11.26 percent of Al2O3：14.32％～16.58％、CaF2：9.15％～11.55％、SiO2Less than or equal to 2.95 percent, and ash content and water content less than or equal to 1.9 percent.
3. A preparation method of the synthetic slag for smelting titanium-containing H-shaped steel according to claim 1, which comprises the following steps:
1) taking 42-52% of active lime, 18-28% of light-burned dolomite, 9-15% of fluorite and 12-20% of bauxite clinker according to weight percentage, mixing uniformly and crushing to prepare synthetic slag powder;
2) and uniformly mixing the synthetic slag powder and the foam balls to prepare a mixed raw material, wherein the volume ratio of the synthetic slag powder to the foam balls is (4: 1) to (5: 1) (ii) a
3) Pressing the mixed raw materials into synthetic slag balls;
4) and (3) placing the synthetic slag balls into a heating furnace, and heating for 55-65 minutes to obtain the synthetic slag for smelting the titanium-containing H-shaped steel.
4. The preparation method according to claim 3, wherein in the step 1), 45-50% of active lime, 20-25% of light-burned dolomite, 10-14% of fluorite and 14-19% of bauxite clinker are taken according to weight percentage.
5. The preparation method according to claim 3, wherein in the step 1), the particle size of the synthetic slag powder is less than or equal to 0.05 mm.
6. The preparation method according to claim 3, wherein the particle size of the foam beads is 2 to 3 mm.
7. The preparation method according to claim 3, wherein in the step 3), the diameter of the synthetic slag ball is 5-7 cm.
8. The method according to claim 3, wherein the heating temperature in the step 4) is 450 to 480 ℃.
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