CN115747417A - Smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel - Google Patents
Smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel Download PDFInfo
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- CN115747417A CN115747417A CN202211600239.3A CN202211600239A CN115747417A CN 115747417 A CN115747417 A CN 115747417A CN 202211600239 A CN202211600239 A CN 202211600239A CN 115747417 A CN115747417 A CN 115747417A
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 87
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 74
- 239000002893 slag Substances 0.000 title claims abstract description 69
- 238000007670 refining Methods 0.000 title claims abstract description 57
- 229910000532 Deoxidized steel Inorganic materials 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000003723 Smelting Methods 0.000 title claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 54
- 239000000956 alloy Substances 0.000 claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 8
- -1 cerium rare earth Chemical class 0.000 claims abstract description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 8
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 8
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 8
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 50
- 229910052742 iron Inorganic materials 0.000 claims description 25
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910000636 Ce alloy Inorganic materials 0.000 claims description 3
- 229910000858 La alloy Inorganic materials 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 18
- 238000006479 redox reaction Methods 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 3
- 150000004763 sulfides Chemical class 0.000 description 3
- 238000009489 vacuum treatment Methods 0.000 description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical group [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018516 Al—O Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel, which is characterized in that rare earth alloy is added into the steel at the last stage of refining, the content of the rare earth in the rare earth alloy is more than or equal to 10 percent, the rare earth elements in the rare earth alloy comprise yttrium Y which is more than or equal to 10 percent, lanthanum La which is more than or equal to 5 percent and cerium Ce which is more than or equal to 0 percent, and the sum of the mass of the lanthanum and the cerium rare earth in the alloy is not more than the mass of yttrium; after the rare earth alloy is added, the heating operation is not allowed to be executed, but a soft blowing process is adopted, and the soft blowing time is more than or equal to 18min; the rare earth alloy, the molten steel and the furnace slag are deoxidized and desulfurized, and the formed rare earth oxysulfide floats to the furnace slag and reacts with Al in the furnace slag 2 O 3 Form stable aluminate rare earth compound and reduce active Al in slag 2 O 3 To reduce the oxidation-reduction reaction of aluminum in the inclusion-steel-slagThe aluminum content in the molten steel and the inclusions is reduced.
Description
Technical Field
The invention relates to the technical field of application of rare earth in steel, in particular to a smelting production method for adding rare earth into aluminum-free deoxidized steel refining slag.
Background
The aluminum-free deoxidized steel has strict requirements on the aluminum content in steel, the aluminum content in steel usually does not exceed 80ppm, low aluminum alloy and slag charge must be adopted for deoxidation alloying and slagging, otherwise, the aluminum content exceeds the standard or impurities are coarse. The refining slag of the aluminum-free deoxidized steel generally has the characteristics of low alkalinity and low alumina, and the high content of active alumina in slag in the refining process can cause the transfer of aluminum in the slag to molten steel and inclusions, and measures must be taken to inhibit the process. The aluminum-free deoxidized steel is subjected to slag making by adopting conventional lime or synthetic slag, the content of aluminum oxide in the slag is below 8%, and a steel ladle and refractory materials also contain certain aluminum oxide in the smelting process, so that the content of aluminum in molten steel and inclusions is inevitably increased, and the overall quality of the aluminum-free deoxidized steel is influenced.
The invention provides a rare earth-containing refining slag system for aluminum-free deoxidized steel and a control method, which are suitable for smelting aluminum-free deoxidized steel 2 O 3 Form stable aluminate rare earth compound and reduce active Al in slag 2 O 3 The content of the aluminum in the inclusion, the molten steel and the slag is reduced, and the aim of reducing the aluminum content in the molten steel and the inclusion is fulfilled. Under the condition, the alloy and slag with common aluminum content can be adopted to carry out smelting production of the aluminum-free deoxidized steel, so that the additional cost caused by controlling the aluminum content is greatly reduced; at the same timeThe rare earth alloy is added in a proper mode, so that molten steel and slag can be deoxidized, the cleanliness of the molten steel is improved, and the effect is good.
Document 1: relates to a rare earth oxide-containing steelmaking refining slag and a preparation and use method thereof, which is characterized in that: a refining slag system containing rare earth oxide is designed, wherein the rare earth oxide is cerium oxide, and a mode of directly adding the cerium oxide into slag is adopted. The refining slag system has good melting performance, lower viscosity value at the steelmaking temperature and better fluidity. Tests show that compared with the traditional refining slag system, the deoxidation rate and the reduction rate of the inclusion level both reach more than 15 percent, and the refining efficiency is effectively improved.
Document 2: the smelting process for controlling the inclusion of the spring steel is suitable for controlling the inclusion of the spring steel and is characterized in that the components of raw materials for slagging and final refining slag are specified, the refining slag does not contain rare earth elements, and a slag system cannot control the Al content in molten steel.
Document 3: the method is suitable for low-carbon aluminum-free steel subjected to RH vacuum treatment, deoxidation and dealumination are carried out by utilizing Al-O reaction in RH, the addition amount of Al is strictly controlled, only Als is controlled, and Alt and Alb cannot be controlled.
Disclosure of Invention
The invention aims to provide a smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel, which comprises the steps of adding rare earth alloy into steel, enabling the rare earth alloy to generate deoxidation and desulfurization reactions with molten steel and furnace slag, enabling formed rare earth oxysulfide to float into the furnace slag and to be in contact with Al in the furnace slag 2 O 3 Form stable aluminate rare earth compound and reduce active Al in slag 2 O 3 The content of the aluminum in the inclusion, the molten steel and the slag is reduced, and the aim of reducing the aluminum content in the molten steel and the inclusion is fulfilled.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel, which adopts the technical process of KR molten iron pretreatment, BOF blowing, LF refining, rare earth addition, VD/RH vacuum refining and continuous casting for production, and is characterized in that: adding rare earth alloy into molten steel at the last stage of LF refining, wherein the rare earth alloy is high-purity rare earth and pure iron and is produced by smelting in a medium-frequency vacuum induction furnace; the content of rare earth in the rare earth alloy is more than or equal to 10 percent, the rare earth elements in the rare earth alloy comprise more than or equal to 10 percent of yttrium Y, more than or equal to 5 percent of lanthanum La and more than or equal to 0 percent of cerium Ce, and the sum of the mass of the lanthanum and the cerium rare earth in the alloy does not exceed the mass of yttrium; the heating operation is not allowed to be carried out after the rare earth alloy is added, but a soft blowing process is adopted, and the soft blowing time is more than or equal to 18min.
Furthermore, the rare earth alloy is packaged by an iron bucket or an iron sheet, and the thickness of the iron bucket or the iron sheet is more than or equal to 3mm.
Furthermore, the addition amount of the rare earth alloy is 0.1 kg/t-2 kg/t.
Further, a principle is formulated according to the rare earth alloy addition scheme: the larger the addition amount of the rare earth alloy is, the lower the proportion of La and Ce alloy in the rare earth alloy is.
Further, the components of the slag before the rare earth alloy is added into the refining furnace are as follows: caO:45% -55% of SiO 2 ：20％-30％，Al 2 O 3 Less than or equal to 8 percent, less than or equal to 10 percent of MgO and the balance of impurities.
Further, the components of the refining slag after the rare earth alloy is added meet the following conditions: caO:42% -52%, siO2:18% -30% of Al 2 O 3 Not more than 7%, not more than 10% of MgO, RExOySz:0.2 to 15 percent, and the balance of impurities.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a rare earth-containing refining slag system for aluminum-free deoxidized steel and a control method thereof, so that the aluminum-free deoxidized steel can be smelted and produced by adopting alloy and slag with common aluminum content, the cost of rare earth alloy is 50 yuan/t, the alloy and slag with common aluminum content can reduce the production cost by 52.3 yuan/t, the annual output of the aluminum-free deoxidized steel is more than 100 ten thousand tons, and the cost can be reduced by not less than 230 ten thousand yuan/year.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows the morphology and composition of oxides in a conventional process for producing an aluminum-free deoxidized steel;
FIG. 2 is the appearance and distribution of sulfides in the aluminum-free deoxidized steel produced by the conventional process;
FIG. 3 shows the morphology and composition of oxides in the aluminum-free deoxidized steel produced by the method of the invention;
FIG. 4 shows the appearance and distribution of sulfides in the aluminum-free deoxidized steel produced by the method of the invention.
Detailed Description
A smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel comprises the following steps: KR molten iron pretreatment, converter, LF external refining, rare earth addition, VD/RH vacuum refining and continuous casting.
The molten iron is subjected to KR pretreatment for desulfurization, the sulfur content [ S ] in the molten iron is less than or equal to 0.005%, and the sulfur content [ S ] in the scrap steel matched with the molten iron is less than or equal to 0.015%.
The method for producing the aluminum-free deoxidized steel needs a top-bottom combined blown converter for smelting, the terminal point [ O ] of the converter is less than or equal to 600ppm, and the tapping temperature is more than or equal to 1550 ℃; the molten steel is deoxidized by low-aluminum or aluminum-free alloy in the tapping process, the addition amount of a deoxidizer is less than or equal to 5kg/t, and synthetic slag or top slag lime is added in the tapping process at 3-7kg/t.
The method for producing the aluminum-free deoxidized steel is adopted, LF refining is in place and heated to produce white slag, and the step of adding slag charge comprises the following steps: lime or synthetic slag 3-4kg/t, fluorite 0.5-1.5kg/t, the slag before adding rare earth for LF refining comprises: caO:45% -55% of SiO 2 ：20％-30％，Al 2 O 3 Less than or equal to 10 percent, less than or equal to 10 percent of MgO and the balance of impurities; the LF refining process must ensure sufficient heating time, molten steel is not allowed to be heated after rare earth is added, and the dislocation temperature of the LF refining is more than or equal to 1620 ℃; argon is blown and stirred in the whole refining process, and the flow of the argon is more than or equal to 300NL/min.
And adding rare earth alloy into the molten steel at the last stage of LF refining, wherein the rare earth alloy is high-purity rare earth and pure iron, and is produced by smelting in a medium-frequency vacuum induction furnace. The rare earth content in the rare earth alloy is more than or equal to 10 percent, the rare earth elements in the rare earth alloy comprise yttrium (Y is more than or equal to 10 percent), lanthanum (La is more than or equal to 5 percent) and cerium (Ce is more than or equal to 0 percent), and the sum of the mass of the lanthanum and the cerium in the alloy is not more thanExceeding the mass of yttrium. The rare earth alloy is packaged by an iron bucket or an iron sheet, and the thickness of the iron bucket or the iron sheet is more than or equal to 3mm. The adding amount of the rare earth alloy is 0.1 kg/t-2 kg/t, and the principle of the scheme of the adding amount of the rare earth alloy is as follows: the larger the addition amount of the rare earth alloy is, the lower the proportion of La and Ce alloy in the rare earth alloy is. The components of the slag of the refining furnace after the rare earth alloy is added meet the following conditions: caO:42% -52%, siO2:18% -30% of Al 2 O 3 Less than or equal to 7 percent, mgO less than or equal to 10 percent, RExOySz:0.2 to 15 percent, and the balance of impurities. After the rare earth alloy is added, a soft blowing process is adopted, and the soft blowing time is more than or equal to 18min.
The method for producing the aluminum-free deoxidized steel requires that the deep vacuum treatment time is more than or equal to 12min, the deep vacuum degree is less than or equal to 50Pa and the soft blowing time after the vacuum breaking is more than or equal to 18min if the vacuum refining treatment is adopted.
The method for producing the aluminum-free deoxidized steel has the advantages that the standing time of the ladle before casting is more than or equal to 10min, and comprehensive protective casting measures must be adopted in the continuous casting process.
Comparative example 1: oxide and sulfide changes in aluminum-free deoxidized steel
The original production process comprises the following specific operation flows: the smelting production process flow comprises the following steps: KR molten iron pretreatment, converter, LF external refining, VD/RH vacuum refining and continuous casting. The molten iron needs to be subjected to KR pretreatment for desulfurization, the sulfur content [ S ] in the molten iron is less than or equal to 0.005%, and the sulfur content [ S ] in scrap steel matched with the molten iron is less than or equal to 0.015%.
Smelting in a top-bottom combined blown converter, wherein the terminal point [ O ] of the converter is less than or equal to 600ppm, and the tapping temperature is more than or equal to 1550 ℃; and deoxidizing the molten steel by adopting low-aluminum or aluminum-free alloy in the tapping process, wherein the addition amount of a deoxidizing agent is less than or equal to 5kg/t, and 3-7kg/t of synthetic slag or top slag lime is added in the tapping process.
The method for producing the aluminum-free deoxidized steel is adopted, LF refining is in place and heated to produce white slag, and the step of adding slag charge comprises the following steps: lime or synthetic slag 3-4kg/t, fluorite 0.5-1.5kg/t, slag before LF refining adding rare earth comprises: caO:45% -55% of SiO 2 ：20％-30％，Al 2 O 3 Less than or equal to 10 percent, less than or equal to 10 percent of MgO and the balance of impurities.
If vacuum refining treatment is adopted, the deep vacuum treatment time is required to be more than or equal to 10min, the deep vacuum degree is less than or equal to 80Pa, and the soft blowing time after the air breaking is more than or equal to 15min. And protective casting measures are adopted in the continuous casting process.
The shape and components of oxides and sulfides in the aluminum-free deoxidized steel produced by the original production process are shown in the following figures 1 and 2.
The shape and the components of oxides in the aluminum-free deoxidized steel produced by the method are shown in the following figures 3 and 4. In the aluminum-free deoxidized steel produced by the method provided by the invention, no sulfide is found.
Comparative example 2: reduced total oxygen content and aluminum content in aluminum-free deoxidized steel
After the invention is adopted, the rare earth alloy has obvious deoxidation effect, tables 1 and 2 respectively show the change conditions of refining slag components, total oxygen content and aluminum content of steel billets before and after the invention is adopted, and data in the tables show that the refining slag components are obviously changed, and the aluminum content and the total oxygen content in steel have obvious development trend.
TABLE 1 refining slag composition of original process, refining slag composition of the invention and final total oxygen content
| Index (es) | CaO/％ | SiO 2 /％ | Al 2 O 3 /％ | MgO/％ | RE x O y S z /％ |
| Crude refining slag | 45-55 | 20-30 | ≤8 | ≤10 | - |
| Refining slag of the invention | 42-52 | 18-30 | ≤7 | ≤8 | 0.2-15 |
TABLE 1 indexes of main components in steel after refining slag according to the invention
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A smelting production method for adding rare earth into refining slag of aluminum-free deoxidized steel adopts KR molten iron pretreatment, BOF blowing, LF refining, rare earth addition, VD/RH vacuum refining and continuous casting process flow production, and is characterized in that: adding rare earth alloy into molten steel at the last stage of LF refining, wherein the rare earth alloy is high-purity rare earth and pure iron and is produced by smelting in a medium-frequency vacuum induction furnace; the content of rare earth in the rare earth alloy is more than or equal to 10 percent, the rare earth elements in the rare earth alloy comprise more than or equal to 10 percent of yttrium Y, more than or equal to 5 percent of lanthanum La and more than or equal to 0 percent of cerium Ce, and the sum of the mass of the lanthanum and the cerium rare earth in the alloy does not exceed the mass of yttrium; the heating operation is not allowed to be carried out after the rare earth alloy is added, but a soft blowing process is adopted, and the soft blowing time is more than or equal to 18min.
2. The smelting production method for adding rare earth into the refining slag of the aluminum-free deoxidized steel according to the claim 1, characterized in that: the rare earth alloy is packaged by an iron bucket or an iron sheet, and the thickness of the iron bucket or the iron sheet is more than or equal to 3mm.
3. The smelting production method for adding rare earth into the refining slag of the aluminum-free deoxidized steel as claimed in claim 1, characterized in that: the addition amount of the rare earth alloy is 0.1 kg/t-2 kg/t.
4. The smelting production method for adding rare earth into the refining slag of the aluminum-free deoxidized steel as claimed in claim 1, characterized in that: the principle of the rare earth alloy addition scheme is established: the larger the addition amount of the rare earth alloy is, the lower the proportion of La and Ce alloy in the rare earth alloy is.
5. The smelting production method for adding rare earth into the refining slag of the aluminum-free deoxidized steel as claimed in claim 1, characterized in that: the refining slag before the rare earth alloy is added comprises the following components: caO:45% -55% of SiO 2 ：20％-30％，Al 2 O 3 Less than or equal to 8 percent, less than or equal to 10 percent of MgO and the balance of impurities.
6. The smelting production method for adding rare earth into the refining slag of the aluminum-free deoxidized steel as claimed in claim 5, characterized in that: the components of the refining furnace slag after the rare earth alloy is added meet the following conditions: caO:42% -52%, siO2:18% -30% of Al 2 O 3 Not more than 7%, not more than 10% of MgO, RExOySz:0.2 to 15 percent, and the balance of impurities.
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| CN115747417B (en) | 2024-01-19 |
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