CN117326875A - Refining ladle zirconium drainage sand for high alloy steel and preparation method thereof - Google Patents
Refining ladle zirconium drainage sand for high alloy steel and preparation method thereof Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 100
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 34
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052726 zirconium Inorganic materials 0.000 title claims abstract description 20
- 238000007670 refining Methods 0.000 title claims description 30
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 17
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 15
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 104
- 229910000831 Steel Inorganic materials 0.000 claims description 58
- 239000010959 steel Substances 0.000 claims description 58
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 36
- 239000002994 raw material Substances 0.000 claims description 27
- 239000011651 chromium Substances 0.000 claims description 25
- 239000000395 magnesium oxide Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 14
- 239000006229 carbon black Substances 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 239000010431 corundum Substances 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- 239000006004 Quartz sand Substances 0.000 claims description 8
- 239000012141 concentrate Substances 0.000 claims description 8
- 239000011819 refractory material Substances 0.000 claims description 8
- 229910052845 zircon Inorganic materials 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052863 mullite Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 description 35
- 238000004519 manufacturing process Methods 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 238000010079 rubber tapping Methods 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000010587 phase diagram Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- -1 siliceous Chemical compound 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention provides refined ladle zirconium drainage sand for high alloy steel and a preparation method thereof, wherein the drainage sand comprises the following components in percentage by mass (wt%): 20.0 to 45.0% of ZrO 2 25.0 to 35.0 percent of SiO 2 10.0 to 15.0 percent of Al 2 O 3 3.5 to 10.5 percent of MgO and 5.0 to 15.0 percent of Cr 2 O 3 4.0 to 10.0 percent of Fe 2 O 3 And 0.5 to 1.5% of T.C; meanwhile, the granularity proportion of the drainage sand with the granularity of 0.15-2.0mm is more than or equal to 97 percent, and the moisture is less than or equal to 0.4 percent.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to zirconium drainage sand of a refining ladle for high alloy steel.
Background
With the progress of material technology, the requirements of various industries on steel quality are increasingly higher, and the requirements of steel factories on continuous casting technology and automatic ladle pouring rate are also increasingly higher. The drainage sand directly influences the automatic casting rate of the ladle, and is an important factor for protecting the casting of the ladle. If the ladle can not be self-poured, oxygen burning drainage is needed, and the adverse effect is that the quality of a casting blank is directly affected: the molten steel is directly introduced into the tundish without passing through the long nozzle, so that secondary oxidization of the molten steel is caused, and the long oxygen burning drainage time can cause the continuous casting to stop production due to the broken casting. Therefore, the ladle sand drainage technology is more and more important for high-speed continuous casting and clean steel and variety steel production.
With the tremendous development of economy, the demand for special steel grades such as high alloy steel is increasing. Taking a certain steel rabbet electric furnace production line as an example, the alloy amount added in the smelting of the high-added-value high-alloy steel grade exceeds 10 percent, and mainly Cr, ni, mo and other alloys need to be melted and have long reaction time, so that the tapping temperature is particularly high, and the tapping temperature is 1650-1690 ℃; the refining process time is long and reaches 5 to 10 hours; after LF, VD or VOD treatment, molten steel reacts vigorously in the ladle, so that drainage sand is eroded, lost and sintered, the self-casting rate of the high alloy steel ladle is only about 87%, and the quality of the molten steel and the continuous casting production are affected by oxygen burning, casting and continuous casting. The existing chromium diversion sand, high chromium diversion sand, siliceous diversion sand and the like cannot meet the requirements of high self-casting rate on site. High alloy steel with high added value is often subjected to oxygen burning casting, and great economic loss is brought to a steel enterprise.
The common drainage sand comprises four types of forsterite, siliceous, zirconium and chromium drainage sand. The best chromium drainage sand has the melting point of 1730-1750 ℃, has the advantages of good fluidity, high melting point, no excessive sintering and the like, can reach more than 90% of self-casting rate when being applied to most refined steel ladles, but has the self-casting rate of less than 90% when being applied to refined steel ladles with high tapping temperature and more than 5h of shelf life. If the automatic casting is not carried out and the oxygen burning is adopted, a considerable amount of molten steel is cast in an open mode, secondary oxidation is caused, the quality of the molten steel is affected, the cost is increased, and the safety of equipment and operators is threatened, so that the automatic casting of the steel ladle is not acceptable for steel factories. Aiming at different steel types and refining processes, technicians are developing novel drainage sand with better adaptability.
The Chinese patent document with publication number 10362426A discloses a technology of 'drainage sand for continuous casting high-aluminum steel and a using method thereof', wherein the drainage sand comprises the following chemical components in percentage by mass: cr (Cr) 2 O 3 25.0～30.0％，SiO 2 32.0～36.0％，Al 2 O 3 6.0～10.0％，Fe 2 O 3 15.0-20.0 percent of MgO, 4.0-8.0 percent of C and 10-15 percent of C. The method is used for high-aluminum steel with the Al content of 1.6-2.45%. The high-alumina steel can cause more steel ladle nozzle surrounding structureAnd the average steel receiving time of the steel grade is more than 200min. The self-casting rate of the common high-aluminum steel ladle is 29.51 percent, which is not more than 50 percent. After the technology of the invention is adopted, the self-casting rate of the high-aluminum steel ladle reaches 90 percent.
The stainless steel has higher alloy element content, and the smelting process is different from the common steel type, so the problems of low self-casting rate, excessive oxygen burning, continuous casting, and the like of the stainless steel ladle often occur. The Chinese patent document with publication number 102001854A provides a special ladle drainage sand for stainless steel and a production process thereof, and discloses the special ladle drainage sand for stainless steel with the self-casting rate of more than 98%. The main chemical indexes are as follows: cr (Cr) 2 O 3 25～36％，SiO 2 15～25％，Al 2 O 3 5～10％，Fe 2 O 3 15.0～20.0，H 2 O is less than or equal to 0.5 percent. The effects of reducing the oxygen burning times, improving the quality of molten steel and ensuring the smooth running of the continuous casting process are achieved.
It can be seen that different steel grades, different smelting and refining conditions have great influence on the use of the diversion sand, and a novel diversion sand with more excellent comprehensive performance and better matching process condition is developed according to the use condition of the diversion sand to meet the requirements of a steel mill, so that good steel product quality, production efficiency and cost are ensured.
Disclosure of Invention
The invention aims to solve the technical problem of providing the zirconium diversion sand for the high alloy steel refining ladle, which can improve the self-casting rate of the high alloy steel refining ladle with high added value, reduce oxygen burning casting, reduce continuous casting and casting breaking, ensure the efficient and smooth continuous casting production and improve the quality of the high alloy steel casting billet.
The technical problems to be solved by the method can be implemented by the following technical schemes.
The zirconium diversion sand of the refining ladle for the high alloy steel is characterized by comprising the following components in percentage by mass (wt%):
20.0 to 45.0% of ZrO 2 25.0 to 35.0 percent of SiO 2 10.0 to 15.0 percent of Al 2 O 3 3.5 to 10.5 percent of MgO and 5.0 to 15.0 percent of Cr 2 O 3 ，4.0～10.0％Fe of (2) 2 O 3 And 0.5 to 1.5% of T.C;
meanwhile, the granularity proportion of the drainage sand with the granularity of 0.15-2.0mm is more than or equal to 97 percent, and the moisture is less than or equal to 0.4 percent.
As a further improvement of the technical proposal, the component ZrO in the drainage sand 2 Is introduced by one or more of zirconia corundum, zircon mullite, zirconite and recycled zircon refractory material, and requires the chemical components ZrO of the raw materials 2 ≥65.0％。
Also as a further improvement of the technical proposal, partial or all ZrO in the drainage sand 2 The used zirconia functional refractory material recovered from continuous casting refractory material is processed and the recovered material with granularity of 0.15-2.0mm is used as introduced ZrO 2 Is a substitute for the raw materials.
Further improvement of the technical proposal is that the component SiO in the drainage sand 2 Mainly introduced by quartz sand, and a small amount of the quartz sand is introduced by zircon mullite or zirconite, and the quartz sand SiO is required 2 ≥98.5％。
As a further improvement of the technical proposal, the component Al in the drainage sand 2 O 3 Mainly comprises one or two of high-alumina ball and corundum sand, and requires high-alumina ball Al 2 O 3 Not less than 85.0%, corundum sand Al 2 O 3 ≥99.0％。
Also as a further improvement of the technical proposal, the component Cr in the diversion sand 2 O 3 Fe (Fe) 2 O 3 Mainly introduced by chromium concentrate, and requires Cr in the chromium concentrate 2 O 3 ≥45.0％，Fe 2 O 3 ≤28.0％。
As a further improvement of the technical scheme, the MgO in the diversion sand is brought in by the raw materials of the high-purity magnesia and the chromite, and the MgO in the high-purity magnesia is required to be more than or equal to 97.0 percent. MgO in the chromium concentrate is less than or equal to 11.0 percent.
As a preferred embodiment of the invention, C in the drainage sand is mainly carried in by carbon black and residual carbon in the resin, wherein the C in the carbon black is more than or equal to 99.0 percent, and the C in the resin is more than or equal to 35.0 percent.
The invention aims to provide a preparation method of the refined ladle zirconium drainage sand for high alloy steel, which comprises the following steps:
(1) Crushing and shaping each oxide raw material, processing the crushed and shaped oxide raw material into granular or round particles as much as possible, and screening out raw materials with the granularity of 0.15-2mm for standby;
(2) Mixing various oxide raw materials with set components in a mixing mill, and stirring for 10-15 min;
(3) Adding liquid resin, continuously mixing and stirring for 3-7 min until the resin liquid completely wets the surfaces of drainage sand particles;
(4) Finally adding carbon black, mixing for 5-10 min, and uniformly coating the carbon black on the surfaces of the raw material particles;
(5) And removing residual moisture through baking and drying, so that the substance C is more firmly combined and wrapped on the surface of the drainage sand particles.
Compared with the prior art, the invention designs the scientific total chemical composition range of the drainage sand, so that the drainage sand has good flowing property, high temperature resistance and corrosion resistance, thereby adapting to the sintering conditions and refining process conditions of high alloy steel refining ladles of different varieties in steel factories, ensuring that the self-casting rate reaches more than 99.5 percent and is improved by 13 percent compared with the prior art. The oxygen burning times of continuous casting and casting are reduced, the high-efficiency and smooth production of cast steel is ensured, the purity of molten steel of high alloy steel is greatly improved, the quality of high alloy steel casting blanks is improved, and the cost reduction and synergy effects of steel factories are remarkable.
Drawings
FIG. 1 is ZrO 2 -SiO 2 -Al 2 O 3 A ternary phase diagram;
Detailed Description
The extremely high self-casting rate of the refined steel ladle is always pursued by steel factories, the variety of the ladle drainage sand is many, and can reach more than 98% under the common condition, but the high self-casting rate can not be reached for special steel, especially high alloy steel, and the steel variety has complex production, high quality requirement and high added value, so the requirement of developing novel drainage sand to adapt to the special steel variety is more and more urgent.
On the other hand, the raw materials used for the diversion sand are all commonly used in the marketFor the raw materials, common high temperature resistance and physical properties are good, but the drainage sand is a mixture of various raw materials, so that whether the drainage sand has good self-casting rate under specific steel types and refining process treatment conditions is determined, and the chemical composition brought by the oxide raw materials is closely related. ZrO by silicate phase diagram analysis of inorganic nonmetallic materials 2 -SiO 2 -Al 2 O 3 ZrO of any one of ternary systems (see FIG. 1) 2 -SiO 2 、ZrO 2 -Al 2 O 3 、Al 2 O 3 -SiO 2 All are important refractory material components, and the eutectic substance composed of the three oxides has high melting point, wide range and good adaptability, and can meet the requirements of 5-10 hours of smelting and transferring time of refining ladles with ultrahigh tapping temperature of different high alloy steels. The molten steel transfer and placement time refers to the time from the beginning of tapping to the beginning of the whole process of pouring steel, and the tapping temperature and the molten steel transfer and placement time influence the sintering performance of the drainage sand, so that the automatic pouring rate of the ladle is greatly influenced.
As can be seen from the ternary phase diagram in FIG. 1, the melting point of any substance composed of the three oxides is above 1700 ℃, the steel tapping temperature is 1650 ℃ higher, if the chemical composition is in the range of 1750-2000 ℃, the drainage sand can reach very high temperature resistance even if being mixed with other minor components, and the drainage sand is not easy to sinter, so that the adaptability to different high alloy steels is very good, and the self-casting rate can be kept high.
ZrO 2 The corrosion resistance to various refining slag and alloy elements in molten steel is very good, and particularly, the stability of the alloy elements in molten steel above 1600 ℃ is the best, the oxygen increasing of the molten steel is avoided, and the quality of the molten steel is the most beneficial. So develop a ZrO-containing alloy 2 Not only can improve the high temperature resistance of the drainage sand, but also resists the drainage sand in the whole refining processThe erosion and melting loss effects are obvious, the good high self-casting rate can be ensured, and the method is very beneficial to the purity of the high alloy steel molten steel.
Based on the research, the invention develops the zirconium diversion sand for the high alloy steel refining ladle, which is particularly suitable for various high alloy steel refining tapping temperatures, and the temperature is higher than 1650 ℃; the refining process comprises LF, VD or VOD, the steel ladle transfer and holding time is long and can keep good self-casting rate for 5-10 hours. The zirconium diversion sand for the high alloy steel refining ladle comprises the following components in percentage by mass (wt%): zrO (ZrO) 2 20.0～45.0％，SiO 2 25.0～35.0％，Al 2 O 3 10.0～15.0％，MgO 3.5～10.5％，Cr 2 O 3 5.0～15.0％，Fe 2 O 3 4.0-10.0% and 0.5-1.5% of T.C. Meanwhile, the granularity proportion of the diversion sand with the granularity of 0.15-2.0mm is more than or equal to 97 percent, and the moisture is less than or equal to 0.4 percent.
ZrO in the present invention 2 The components are introduced by one or more of zirconia corundum, zircon mullite, zirconite or recycled zirconia refractory materials, and the chemical components ZrO2 of the raw materials are required to be more than or equal to 65.0 percent. Due to ZrO 2 The technology of the invention can also adopt the used zirconia functional refractory recovered from the continuous casting refractory, and takes the recovered material with the granularity of 0.15-2.0mm as the introduced ZrO after crushing, shaping and screening 2 Is applied to drainage sand of the technology. ZrO (ZrO) 2 The melting point is 2700 ℃, the chemical stability is excellent, the oxygen is not easily increased by reduction to molten steel, the molten steel is not easily infiltrated by liquid molten metal, and the corrosion resistance is excellent. Its chemical stability is higher than Cr 2 O 3 Is much stronger in molten steel.
SiO in the present invention 2 The components are mainly introduced by quartz sand, and a small amount of the components can be introduced by zircon mullite or zirconite, and the quartz sand SiO is required 2 ≥98.5％。
Al in the present invention 2 O 3 The components are mainly introduced by one or two of high-alumina balls and corundum sand, and the high-alumina balls Al is required 2 O 3 Not less than 85.0%, corundum sand Al 2 O 3 More than or equal to 99.0 percent.
Cr in the invention 2 O 3 Fe (Fe) 2 O 3 Mainly introduced by chromium concentrate, and requires Cr in the chromium concentrate 2 O 3 ≥45.0％，Fe 2 O 3 ≤28.0％，MgO≤11.0％。
In the invention, mgO is brought in by high-purity magnesia and chromite raw materials, and the MgO in the magnesia is required to be more than or equal to 97.0 percent.
The carbon black resin contains a small amount of C, and is mainly carried in by carbon black and residual carbon in the resin. And C, the molten steel permeability resistance of the drainage sand can be improved, and the drainage sand particles in the ladle nozzle are not bonded at high temperature, so that the casting is facilitated. The carbon black C is required to be more than or equal to 99.0 percent, and the resin C is required to be more than or equal to 35.0 percent.
According to the scientific principle disclosed by the silicate multi-element phase diagram, the invention designs the whole proper chemical composition range of the diversion sand, and forms the zirconium diversion sand for the high alloy steel refining ladle, which has reasonable sintering property, excellent erosion resistance and melting loss performance and wide adaptability.
Further, examples of the present technology are given in the following table:
table 1: chemical mass composition (wt%)
Firstly, crushing and shaping each oxide raw material, processing the raw material into granular or round particles as much as possible, and screening out qualified raw materials with the granularity of 0.15-2mm for standby. Mixing the various oxide raw materials combined according to the chemical component ranges in a mixing mill, stirring for 10-15 min, then adding liquid resin, continuously mixing and stirring for 3-7 min, completely wetting the surfaces of drainage sand particles by the resin liquid, and finally adding carbon black, mixing for 5-10 min, so that the carbon black is uniformly coated on the surfaces of the raw material particles. And (3) putting the mixed drainage sand into a baking kiln or a drying kiln for baking, wherein the baking temperature is between 200 and 250 ℃ and the baking time is 8 to 12 hours, and removing residual moisture through baking and drying, so that the C substance is more firmly combined and wrapped on the surfaces of the drainage sand particles. And (3) naturally cooling the baked drainage sand, then passing through a screen with the diameter of 0.15mm again, taking the screen, feeding and homogenizing, so as to further remove fine powder or pseudo particles generated in the production process of the drainage sand, ensuring that the proportion of the obtained drainage sand with the granularity of 0.15-2.0mm is more than or equal to 97%, and the moisture is less than or equal to 0.4%, and packaging the drainage sand into a drainage sand finished product. The physical properties of the drainage sand of the above example are analyzed, and the technical indexes obtained by the drainage sand applied to a production line of a steel electric furnace are shown in Table 2.
Table 2: the physical performance and application index of the invention
Note that: the flow meter is used for measuring the drainage sand self-flow value. The diameter/lower diameter/height=70/100/60 mm on the conical hopper of the tester, the drainage sand is put into the hopper, the upper surface of the drainage sand is scraped flush with the upper surface of the conical hopper, the hopper is lifted, the drainage sand collapses and flows and spreads, the diameter of the drainage sand spread is measured by a caliper, the diameter is measured three times in different directions, and the average value of the diameter is calculated to be the drainage sand self-flow value.
The drainage sand provided by the invention has good high temperature resistance, high sintering temperature and excellent erosion and melting loss resistance, is suitable for severe working conditions of high tapping temperature, long shelf life and complex refining process, and ensures that the self-casting rate reaches more than 99.5%. The oxygen burning times of continuous casting and casting are reduced, the high-efficiency and smooth production of cast steel is ensured, the purity of molten steel of high alloy steel is greatly improved, the quality of high alloy steel casting blanks with high added value is improved, and the cost reduction and synergy effects of steel factories are remarkable.
The self-casting rate of the diversion sand reaches more than 99.5% in the application of 150 ton refining ladle of high alloy steel in a steel enterprise electric furnace production line, wherein the diversion sand comprises high alloy steel such as super 13Cr (after LF+VOD refining treatment), and the shelf life is as long as 10 hours. The self-casting rate is improved by 13 percent.
Claims (9)
1. The zirconium diversion sand for the refining ladle for the high alloy steel is characterized by comprising the following components in percentage by mass (wt%):
20.0 to 45.0% of ZrO 2 25.0 to 35.0 percent of SiO 2 10.0 to 15.0 percent of Al 2 O 3 ，3.5About 10.5 percent of MgO and about 5.0 to 15.0 percent of Cr 2 O 3 4.0 to 10.0 percent of Fe 2 O 3 And 0.5 to 1.5% of T.C;
meanwhile, the granularity proportion of the drainage sand with the granularity of 0.15-2.0mm is more than or equal to 97 percent, and the moisture is less than or equal to 0.4 percent.
2. The ladle zirconium refining guide sand for high alloy steel according to claim 1, wherein the ZrO as a component in the guide sand 2 Is introduced by one or more of zirconia corundum, zircon mullite, zirconite and recycled zircon refractory material, and requires the chemical components ZrO of the raw materials 2 ≥65.0％。
3. The ladle zirconium diversion sand for high alloy steel according to claim 1 or 2, wherein part or all of ZrO in the diversion sand 2 The used zirconia functional refractory material recovered from continuous casting refractory material is processed and the recovered material with granularity of 0.15-2.0mm is used as introduced ZrO 2 Is a substitute for the raw materials.
4. The refined-ladle zirconium drainage sand for high alloy steel according to claim 1, wherein the component SiO in the drainage sand is as follows 2 Mainly introduced by quartz sand, and a small amount of the quartz sand is introduced by zircon mullite or zirconite, and the quartz sand SiO is required 2 ≥98.5％。
5. The ladle zirconium refining guide sand for high alloy steel according to claim 1, wherein the component Al in the guide sand is as follows 2 O 3 Mainly comprises one or two of high-alumina ball and corundum sand, and requires high-alumina ball Al 2 O 3 Not less than 85.0%, corundum sand Al 2 O 3 ≥99.0％。
6. The ladle zirconium refining guide sand for high alloy steel according to claim 1, wherein the component Cr in the guide sand is as follows 2 O 3 Fe (Fe) 2 O 3 Mainly introduced by chromium concentrate, and requires Cr in the chromium concentrate 2 O 3 ≥45.0％，Fe 2 O 3 ≤28.0％。
7. The ladle zirconium diversion sand for refining steel according to claim 1, wherein MgO in the diversion sand is brought in by high-purity magnesia and chromite raw materials, and the MgO in the high-purity magnesia is more than or equal to 97.0%. MgO in the chromium concentrate is less than or equal to 11.0 percent.
8. The ladle zirconium diversion sand for refining high alloy steel according to claim 1, wherein C in the diversion sand is mainly carried by carbon black and residual carbon in resin, and the C in the carbon black is more than or equal to 99.0% and the C in the resin is more than or equal to 35.0%.
9. The method for preparing the zirconium drainage sand of the refining ladle for the high alloy steel according to any one of claims 1 to 8, which is characterized by comprising the following steps:
(1) Crushing and shaping each oxide raw material, processing the crushed and shaped oxide raw material into granular or round particles, and screening the raw material with the granularity of 0.15-2mm for standby;
(2) Mixing various oxide raw materials with set components in a mixing mill, and stirring for 10-15 min;
(3) Adding liquid resin, continuously mixing and stirring for 3-7 min until the resin liquid completely wets the surfaces of drainage sand particles;
(4) Finally adding carbon black, mixing for 5-10 min, and uniformly coating the carbon black on the surfaces of the raw material particles;
(5) And removing residual moisture through baking and drying, so that the substance C is more firmly combined and wrapped on the surface of the drainage sand particles.
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