CN1261258C - Douring basket protecting slag for continuous casting and its prepn - Google Patents
Douring basket protecting slag for continuous casting and its prepn Download PDFInfo
- Publication number
- CN1261258C CN1261258C CN 03158318 CN03158318A CN1261258C CN 1261258 C CN1261258 C CN 1261258C CN 03158318 CN03158318 CN 03158318 CN 03158318 A CN03158318 A CN 03158318A CN 1261258 C CN1261258 C CN 1261258C
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- CN
- China
- Prior art keywords
- cao
- continuous casting
- covering slag
- tundish covering
- sio
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Abstract
The present invention relates to a tundish casting powder for continuous casting and the perparing method thereof. The casting powder is characterized in that the casting powder are hollow particles comprises the following chemical components: 10 to 70%wt of CaO, 0.5 to 30%wt of SiO2, 3 to 50%wt of Al2O3, 0.4 to 20%wt of MgO, 0 to 85%wt of C, wherein the CaO/SiO2 is 1.1 to 45. The casting powder has the following preparation steps: first, mixing and pre-melting CaO and Al2O3 or adding iron powder then to obtain base material having Al2O3 and Fe passivating films on the surface of CaO; then crushing the base material into fine powder, and then pre-mixing the fine powder with organic waterproof coating films material to form waterproof coating films; adding the rest components to form slurry, and spray granulating and drying to form hollow balls. The casting powder of the present invention combines the advantages of double-layer casting powder, overcomes the disadvantages of double-layer casting powder simultaneously, and is novel and ideal casting powder for tundishes.
Description
Technical field
The present invention relates to a kind of continuous casting tundish covering slag and preparation method.
Background technology
The tundish covering slag has adiabatic heat-insulation, prevents molten steel oxidation, dross inclusion adsorption, and therefore cleaning molten steel is a kind of important requisite auxiliary material in the steel-making.Existing tundish covering slag, adopting acid (CaO/SiO is less than 1.0) or bottom usually is alkaline pulverulent material such as active lime or metallurgy lime, the upper strata is the double shielding slag of carbonaceous insulation material.Yet the protected acidic slag not only easily corrodes ladle lining, dross inclusion adsorption, purify hot metal ability, and metallurgical effect is bad, and higher because of silicon content, also can cause molten steel to increase silicon.The bottom caustic lime, the double shielding slag of upper strata carbonaceous material, major defect is the easy aquation of bottom lime, not only can make molten steel increase hydrogen, causes the steel hydrogen embrittlement; And lime hydration also can cause the molten steel surface heat to lose in a large number, makes molten steel surface produce cold steel, causes covering slag to lose metallurgical function.Secondly, because therefore the easy aquation of lime be difficult to make hollow bead by slurrying, thereby can only make dry powder or full particle, however the powdery covering slag, it is very inconvenient not only to use operation, also can cause the pollution to environment; And spreadability is poor, Yi Judui, and easy-sintering can cause stopper slagging scorification piece, is easy to generate production accident.The easy aquation of lime is also made troubles to accumulating besides, easily causes performance to reduce.
Chinese patent 01115451.9 disclosed a kind of pre-melted type material covering slag, it consists of: CaO:20-45%; SiO
2: 20-50%; C:O-25%; Al
2O
3: 0-15%; BaO:0-15%; MgO:0-15%; SrO:0-15%; CaF
2: 0-15%; B
2O
3: 0-10%; Na
2O+K
2O:0-15%.This covering slag is too high owing to containing potassium sodium amount; viscosity is little; fusing point is lower, can only use as crystallizer protecting residue, and the tundish that can not be used for hot environment uses; and cylinder-packing, long nozzle and stopper are corroded serious; shortened the service life of refractory material, heat insulation effect is also relatively poor relatively, and burn-off rate is fast; can cause liquid level to tie cold steel, lose the covering slag function.This covering slag still is the full particle structure besides, has the defective of particulate material equally.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of spreadability good, it is strong that absorption is mingled with ability, and metallurgical effect is good, good operation performance, and environmentally safe corrodes little continuous casting tundish covering slag to cylinder-packing.
Another object of the present invention is to provide the preparation method of a kind of above-mentioned tundish with covering slag.
The object of the invention realizes, mainly is by adjusting component, and the insulation material that will form covering slag makes up with alkaline metallurgical synthetic slag and make hollow bead, reaches the metallurgical effect that both keeps the double shielding slag good, and the effect of its shortcoming and defect has been abandoned in assembly again.Specifically, continuous casting of the present invention tundish covering slag is characterized in that covering slag is hollow bead, and its chemical composition is CaO 10-38.55%wt, SiO
20.5-30%wt, Al
2O
33-50%wt, MgO 0.4-20%wt, C 0-85%wt, wherein CaO/SiO
2Be 1.1-45.
The CaO effect is identical with other covering slag among the present invention, mainly plays dross inclusion adsorption, and the purify hot metal effect is lower than 10% as addition, then is difficult to balance SiO
2, can cause silicon excessive, make molten steel increase silicon, corrode cylinder-packing, the dross inclusion adsorption ability drop; Excessively surpass 70%, cause calcium excessive, be difficult for fusing, and, also can cause the dross inclusion adsorption ability drop, lose metallurgical function owing to lack liquid level.Al
2O
3Be mainly used in and adjust the covering slag fusing point, excessively surpass 50%, can cause fusing point too high, CaO is difficult for fusing and loses metallurgical purification function.It is the viscosity of adjusting covering slag that MgO mainly acts on, and forms protective layer at refractory surface, and protection refractory material or reduce erosion to refractory material excessively surpasses 20%, and covering slag viscosity is increased, and causes the stopper slagging scorification too much, unfavorable stopper operation.C prevents the covering slag sintering, and forms favourable three-decker, plays the insulation skeleton simultaneously, heating functioin.To smelting suprelow carbon steel, then should forbid the carbon introducing in the covering slag; Strict for high-carbon steel and heat insulation effect, and less demanding steel grade is controlled in carburetting, can adopt the high-carbon preparation.High CaO/SiO
2Ratio, then favourable superfluous CaO, the lower SiO of forming
2, can make SiO in the component
2By all combinations, favourable elimination SiO
2Ill-effect, and high basicity, impurity absorption is good, and is good to the purification of molten steel metallurgical effect.Combination property price ratio of the present invention, comparatively desirable consists of: CaO 20-38.55%, SiO
21.5-25%, Al
2O
33-25%, MgO 6-15%, C 0-35%, CaO/SiO
2Be 2.5-10.
The K of higher amount in the covering slag
2O, Na
2O, F exist, and can cause the covering slag fusing point that bigger decline is arranged, and the fusing of aggravation covering slag is unfavorable for molten steel insulation, so the present invention helps to form three layers of favourable insulation construction, better with impurity K
2O, Na
2O content is controlled at below 3%, and F content is controlled at below 2%.
Percentage composition of the present invention, and non-exponential learns the meaning extreme value, but a comparatively appropriate amount allows suitable deviation.
The preparation of covering slag of the present invention, the main improvement is earlier CaO to be made preventing hydration to handle, and makes it to adapt to slurrying balling-up granulation.Specifically, continuous casting of the present invention is characterized in that earlier CaO and Al with the preparation of tundish covering slag
2O
3Or add iron powder mixing fritting again, obtain Al being arranged on the CaO surface
2O
3, the Fe passivating film base-material, then base-material is ground into fine powder (as the 200-400 order), form the waterproof coating with organic waterproof coated fertilizer (as atoleine, polyvinyl alcohol, vaseline, phenolic resins etc.) premix again, add the residue component that meets proportioning, make mud, spray granulating and drying forms the hollow ball particle.
The present invention causes batching irregular for preventing the batch mixing precipitation, and reduces amount of water as far as possible, can also add deflocculant (as sodium phosphate trimer, boric acid, oxalic acid) and water reducer (as Sodium Polyacrylate, calcium lignosulfonate, FDN3000 etc.) in slurrying.
Covering slag of the present invention is formed and is adopted the hollow bead structure, has both gathered the advantage of double shielding slag, has overcome its deficiency again simultaneously, and than the double shielding slag, it is little to have bulk density, only is 0.3-0.7g/cm
3, high insulating effect adds temperature drop first less than 5 ℃; Spreadability is good, and is easy and simple to handle, and cold conditions is sprawled the angle less than 5 °; Eliminated the dust pollution in the use, labour protection is good, and environment is had no adverse effect; Metallurgical function control ability is strong, can not cause to add the metallurgical function of undue influence; Hollow bead moisture is low, moisture≤0.3%.High CaO/SiO ratio, not only to be mingled with ability strong in absorption, and low to the erosion of refractory material, and molten steel did not increase silicon to slag line greater than 72 hours service life.The inventive method; owing to adopt fritting to get coating CaO base-material and the processing of secondary waterproof coating; make the base-material microparticle surfaces of high calcium content form the hydrophobic protective layer (waterproof coating) of preventing hydration; thereby solved a lime hydration difficult problem, made it to adapt to the slurrying mist projection granulating and become hollow ball particle technology.
Below in conjunction with several specific embodiments, further specify the present invention, but embodiment not a limitation of the invention.
The specific embodiment
Embodiment 1: with 1.233 tons of content is that 98% calcite and 0.238 ton of superfine aluminium vanadine, 0.06 ton of content are 98% fine iron breeze, handle through electric smelting, be broken into 250 order fine powders, it is even to add 15% vaseline liquid agitation, add Sodium Polyacrylate and boric acid, 0.1-1.5mm hollow ball particle is made in water distribution slurrying, spray granulating and drying.Its chemical composition is seen attached list, the about 0.7g/cm of bulk density
3
Embodiment 2: be lime and 0.4 ton of superfine aluminium vanadine of 98% with 0.6 ton of content, through high temperature kiln melt process, be broken into 250 order fine powders, it is even to add 15% vaseline liquid agitation, add Sodium Polyacrylate and boric acid water distribution slurrying, spray granulating and drying is made 0.1-1.5mm hollow ball particle.Its chemical composition is seen attached list, the about 0.7g/cm of bulk density
3
Embodiment 3: with embodiment 1 gained raw material 18%, add 82% content and be 98% graphite, mixed pulp, spray granulating and drying become the hollow ball particle, and its chemical composition is seen attached list.
Embodiment 4: with embodiment 1 gained raw material 42%, add 58% Suzhou mud, mixed pulp, spray granulating and drying become the hollow ball particle, and its chemical composition is seen attached list.
Embodiment 5: with embodiment 1 gained raw material 50%, add 15% content and be 95% dead burnt magnesite sand, 35% content is 98% graphite, and spray granulating and drying becomes the hollow ball particle, and its chemical composition is seen attached list.
Embodiment 6: with embodiment 1 gained raw material 25%, embodiment 2 raw materials 23%, add 10% content and be 95% dead burnt magnesite sand, 2% Suzhou mud, 10% calcium carbonate, 5% superfine bauxite, 25% content is 98% graphite, and spray granulating and drying becomes the hollow ball particle, and its chemical composition is seen attached list.
Embodiment covering slag composition table
| CaO | SiO 2 | Al 2O 3 | MgO | C | Other | CaO/SiO 2 | |
| 1 | 67.65 | 1.49 | 20.64 | 1.97 | 0.15 | 8.1 | 45.40 |
| 2 | 58.76 | 2.42 | 34.64 | 1.17 | 3.01 | 24.28 | |
| 3 | 12.30 | 0.56 | 3.96 | 0.48 | 80.55 | 2.15 | 21.96 |
| 4 | 51.34 | 20.19 | 24.56 | 1.27 | 0.63 | 2.01 | 2.54 |
| 5 | 34.07 | 1.14 | 10.58 | 15.32 | 34.45 | 4.44 | 29.89 |
| 6 | 38.55 | 9.4 | 11.7 | 10.56 | 24.5 | 5.29 | 4.10 |
Annotate: other compositions are K
2O, Na
2O, Fe
2O
3, TiO
2
Claims (9)
1, a kind of continuous casting tundish covering slag is characterized in that covering slag is hollow bead, and its chemical composition is CaO 10-38.55%wt, SiO
20.5-30%wt, Al
2O
33-50%wt, MgO 0.4-20%wt, C0-85%wt, wherein CaO/SiO
2Be 1.1-45.
2,, it is characterized in that chemical composition is CaO 20-38.55%, SiO according to the described continuous casting of claim 1 tundish covering slag
21.5-25%, MgO 6-15%, Al
2O
33-25%, C0-35%.
3, according to claim 1 or 2 described continuous casting tundish covering slags, it is characterized in that CaO/SiO
2Be 2.0-10.
4, according to claim 1 or 2 described continuous casting tundish covering slags, it is characterized in that impurity K
2O, Na
2O content is smaller or equal to 3%.
5, according to the described continuous casting of claim 3 tundish covering slag, it is characterized in that impurity K
2O, Na
2O content is smaller or equal to 3%.
6,, it is characterized in that impurity F content is smaller or equal to 2% according to the described continuous casting of claim 4 tundish covering slag.
7,, it is characterized in that impurity F content is smaller or equal to 2% according to the described continuous casting of claim 5 tundish covering slag.
8, the described continuous casting of a kind of claim 1～7 is characterized in that earlier CaO and Al with tundish covering slag preparation method
2O
3Or add iron powder mixing fritting again, obtain Al being arranged on the CaO surface
2O
3, the Fe passivating film base-material, then base-material is ground into fine powder, form the waterproof coating with organic waterproof coated fertilizer premix again, add the residue component that meets proportioning, make mud, spray granulating and drying forms the hollow ball particle.
9, described according to Claim 8 continuous casting also is added with deflocculant and water reducer with tundish covering slag preparation method when it is characterized in that slurrying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03158318 CN1261258C (en) | 2003-09-19 | 2003-09-19 | Douring basket protecting slag for continuous casting and its prepn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03158318 CN1261258C (en) | 2003-09-19 | 2003-09-19 | Douring basket protecting slag for continuous casting and its prepn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1526493A CN1526493A (en) | 2004-09-08 |
| CN1261258C true CN1261258C (en) | 2006-06-28 |
Family
ID=34287247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03158318 Expired - Fee Related CN1261258C (en) | 2003-09-19 | 2003-09-19 | Douring basket protecting slag for continuous casting and its prepn |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1261258C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433950B (en) * | 2008-12-03 | 2011-07-27 | 宜兴市振球炉料有限公司 | Method for preparing protecting residue from recovery refining slag |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318165C (en) * | 2004-02-27 | 2007-05-30 | 宝山钢铁股份有限公司 | Coverage dregs for ladle |
| CN1788880B (en) * | 2004-12-14 | 2010-08-11 | 上海盘龙实业有限公司 | Dual-functional composite solid protective slag for stainless steel die casting |
| CN100342997C (en) * | 2005-02-25 | 2007-10-17 | 宝钢集团上海梅山有限公司 | High draw speed plate blank continuous casting low carbon steel crystallizer protective slag |
| CN101468386B (en) * | 2007-12-27 | 2011-07-27 | 攀钢集团攀枝花钢铁研究院 | Continuous casting mould powder and preparation method thereof |
| CN101468387B (en) * | 2007-12-27 | 2011-08-31 | 攀钢集团攀枝花钢铁研究院 | Continuous casting mould fluxes and preparation method thereof |
| CN101618442B (en) * | 2008-07-04 | 2011-08-17 | 上海梅山钢铁股份有限公司 | Reductive covering agent for continuous casting tundish |
| CN102652989A (en) * | 2012-05-10 | 2012-09-05 | 江苏大学 | Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent |
| CN102807382A (en) * | 2012-08-27 | 2012-12-05 | 苏州罗卡节能科技有限公司 | Nonmetallic hollow sphere |
| CN104313251B (en) * | 2014-09-29 | 2016-08-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refining slag applying high-carbon steel to produce |
| WO2022075197A1 (en) * | 2020-10-09 | 2022-04-14 | Ｊｆｅスチール株式会社 | Flux added onto molten steel accommodated in container |
-
2003
- 2003-09-19 CN CN 03158318 patent/CN1261258C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433950B (en) * | 2008-12-03 | 2011-07-27 | 宜兴市振球炉料有限公司 | Method for preparing protecting residue from recovery refining slag |
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| Publication number | Publication date |
|---|---|
| CN1526493A (en) | 2004-09-08 |
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Legal Events
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: YIXING ZHENQIU FURNACE MATERIAL CO., LTD.; YIXING Free format text: FORMER NAME OR ADDRESS: YIXING ZHENQIU FURNACE CHARGE CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 214266 Hubin Road, Xinzhuang Town, Jiangsu, Yixing Co-patentee after: Yixing Supai Synthetic Materials Factory Patentee after: Yixing Zhenqiu Furnace Material Co., Ltd. Address before: 214266 Hubin Road, Xinzhuang Town, Jiangsu, Yixing Patentee before: Yixing Zhenqiu Furnace Charge Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060628 Termination date: 20160919 |
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| CF01 | Termination of patent right due to non-payment of annual fee |