CN103464713B - A kind of method and stuffing sand thereof improving automatic casting ratio - Google Patents
A kind of method and stuffing sand thereof improving automatic casting ratio Download PDFInfo
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- CN103464713B CN103464713B CN201310410209.0A CN201310410209A CN103464713B CN 103464713 B CN103464713 B CN 103464713B CN 201310410209 A CN201310410209 A CN 201310410209A CN 103464713 B CN103464713 B CN 103464713B
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Abstract
The present invention relates to a kind of method improving automatic casting ratio, also relate to the necessary stuffing sand of the method, belong to smelting iron and steel technical field, the method key step is: 1) clear up the mouth of a river, 2) stuffing sand is added to ormal weight to the mouth of a river, 3) impouring molten steel sintering stuffing sand top layer, 4) after molten steel reaches scheduled volume, remove mouth of a river plug, start cast; This stuffing sand is primarily of calcium-silicon powder, chrome green, silica, carbon black composition, and the present invention substantially stops to open and waters diffusing phenomenon, reduces mouth of a river secondary and burns oxygen, automatic casting success rate >=99%.
Description
Technical field
The present invention relates to a kind of method improving automatic casting ratio, also relate to the necessary stuffing sand of the method, belong to smelting iron and steel technical field.
Background technology
Stuffing sand is as ladle bottom mouth of a river packing material, requirement can sinter at a lower temperature on the one hand, during to avoid adding molten steel, stuffing sand floats and causes the accident, require that under high temperature and long-time refined states, meet steel face can not sinter blocked up on the other hand, otherwise affect automatic casting ratio, thus affect normal smelting operation.At present, domesticly generally use chromium matter, the stuffing sand such as siliceous or magnesia, siliceous stuffing sand take quartz sand as base-material, be equipped with feldspar eutectic as acceleration of sintering agent, but the silica in quartz sand can reduce basicity and the aggressive basic cylinder-packing of tundish covering flux, bring adverse influence to tundish alkalescence metallurgy environment; Magnesia stuffing sand for primary raw material with forsterite and magnesia, becomes alkalescent, be conducive to the formation of tundish alkaline environment, but its sintering character is restive; Chromium matter stuffing sand drainage effect is good, but sinter layer is unstable, easily occurs oozing steel, just forms steel sand mixed layer when molten steel penetrates in stuffing sand, and very difficult realization is opened certainly, and serious even cannot be boiled with oxygen lance, and causing breaks waters accident; In addition, no matter be siliceous stuffing sand or magnesia stuffing sand, it is low to Con casting ladle automatic casting ratio, is generally 85 ~ 90%, is difficult to meet the needs of auto-guiding under high temperature or long-time refining condition.
Application number be 201210259273.9 Chinese patent " Chromium-aluminum steel ladle drainage sand " disclose a kind of stuffing sand, it consists of: comprise the chrome ore of 60 ~ 70 parts, the high aluminium ore of 10 ~ 20 parts, the Desert Sand of 10 ~ 20 and 10 ~ 20 parts of properties modifiers, and this technical scheme still exists the defect that above-mentioned chromium matter stuffing sand exists.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of stuffing sand containing calcium-silicon powder, and this stuffing sand utilizes the characteristic of calcium-silicon substantially to stop to open and water diffusing phenomenon, improves automatic casting success rate.
The present invention solves the technical scheme of above technical problem:
Improve a method for automatic casting ratio, carry out as follows: 1) cleaning process, first completes roasting procedure by tundish, then foreign material remaining in middle water containing opening are cleaned out; 2) stuffing sand adds water inlet by the portion that wraps from centre, ensures that stuffing sand is evenly filled up from bottom to wrist oral area in the mouth of a river; 3) by molten steel impouring tundish, now agglomeration is played by high temperature condensation in the surface of stuffing sand; 4) way of manual measurement is adopted to judge liquid level, rod iron is used vertically to insert in tundish, the length of extracting rear steel bonding is steel liquid level, when highly reaching 300mm, take away the mouth of a river, below plug, now the sinter layer of stuffing sand breaks because of the extruding of upper steel hydrostatic pressure, and molten steel is cast from the mouth of a river is flowed out.
A kind of stuffing sand, comprise calcium-silicon powder, the chemical composition of calcium-silicon powder comprises by weight percentage: calcium-silicon 20 ~ 30%, chrome green 20 ~ 30%, silica 30 ~ 40%, carbon black 2 ~ 3%; Wherein the main component of calcium-silicon comprises Si >=60%, Ca >=28%, and all the other are Fe.
Calcium-silicon, a kind of bianry alloy be made up of silicon and calcium, belongs to ferroalloy category, its principal component is silicon and calcium, iron also containing varying number, aluminium, carbon, the impurity such as sulphur and phosphorus, steel and iron industry is used as calcium additive, deoxidier, the denaturant of desulfurizing agent and non-metallic inclusion, cast iron industry is used as inovulant and denaturant, high temperature met by calcium-silicon can produce strong exothermic effect, instantaneous raising environment temperature, the present invention utilizes this feature of calcium-silicon, be added into a part of non-metallic material component again and form a kind of brand-new stuffing sand, this stuffing sand not only ensures sintering character, and by instantaneous a large amount of exothermic reaction, stop the mouth of a river and tie cold steel phenomenon.
The technical scheme that the present invention limits further is:
Further, calcium-silicon Powder Particle Size requires 0-1mm.
Further, stuffing sand is middle bag stuffing sand.
Further, the chemical composition of calcium-silicon powder comprises by weight percentage: calcium-silicon 20%, chrome green 20%, silica 30%, carbon black 2%; Wherein the main component of calcium-silicon comprises Si60%, Ca28%, and all the other are Fe, and described calcium-silicon Powder Particle Size requires 0.1mm.
Further, the chemical composition of calcium-silicon powder comprises by weight percentage: calcium-silicon 30%, chrome green 30%, silica 40%, carbon black 3%; Wherein the main component of calcium-silicon comprises Si62%, Ca30%, and all the other are Fe, and described calcium-silicon Powder Particle Size requires 1mm.
Further, the chemical composition of calcium-silicon powder comprises by weight percentage: calcium-silicon 25%, chrome green 25%, silica 35%, carbon black 2.5%; Wherein the main component of calcium-silicon comprises Si61%, Ca29%, and all the other are Fe, and described calcium-silicon Powder Particle Size requires 0.5mm.
In a word, the present invention adopts calcium-silicon stuffing sand to possess following features: 1) can sinter at a lower temperature, avoids stuffing sand floating when adding molten steel and causes the accident; 2) under high temperature and long-time smelting state, meet molten steel face sintering not thick, can automatic casting be reached, automatic casting ratio >=99%, enhance productivity, reduce molten steel and pollute, reduce flue gas consumption, improve production safety coefficient.
Detailed description of the invention
embodiment
A kind of middle bag stuffing sand containing calcium-silicon powder that the present embodiment provides, comprise calcium-silicon powder, the chemical composition of calcium-silicon powder comprises by weight percentage: calcium-silicon 20 ~ 30%, chrome green 20 ~ 30%, silica 30 ~ 40%, carbon black 2 ~ 3%; Wherein the main component of calcium-silicon comprises Si >=60%, Ca >=28%, and all the other are Fe, and calcium-silicon Powder Particle Size requires 0-1mm;
The actual chemical composition of stuffing sand of the present invention is as shown in table 1:
The chemical composition (wt%) of each embodiment of calcium-silicon powder in table 1 the present invention:
；
The actual chemical composition of calcium-silicon of the present invention is as shown in table 2:
The chemical composition (wt%) of each embodiment of calcium-silicon in table 2 the present invention:
；
Improve a method for automatic casting ratio, carry out as follows: 1) cleaning process, first completes roasting procedure by tundish, then foreign material remaining in middle water containing opening are cleaned out; 2) stuffing sand adds water inlet by the portion that wraps from centre, ensures that stuffing sand is evenly filled up from bottom to wrist oral area in the mouth of a river; 3) by molten steel impouring tundish, now agglomeration is played by high temperature condensation in the surface of stuffing sand; 4) way of manual measurement is adopted to judge liquid level, rod iron is used vertically to insert in tundish, the length of extracting rear steel bonding is steel liquid level, when highly reaching 300mm, take away the mouth of a river, below plug, now the sinter layer of stuffing sand breaks because of the extruding of upper steel hydrostatic pressure, and molten steel is cast from the mouth of a river is flowed out.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (6)
1. a stuffing sand, is characterized in that: described stuffing sand comprises calcium-silicon powder, and the chemical composition of described calcium-silicon powder comprises by weight percentage: calcium-silicon 20 ~ 30%, chrome green 20 ~ 30%, silica 30 ~ 40%, carbon black 2 ~ 3%; Wherein the main component of calcium-silicon comprises Si >=60%, Ca >=28%, and all the other are Fe.
2. stuffing sand as claimed in claim 1, is characterized in that: described calcium-silicon Powder Particle Size requires 0-1mm.
3. stuffing sand as claimed in claim 1 or 2, is characterized in that: described stuffing sand is middle bag stuffing sand.
4. stuffing sand as claimed in claim 2, is characterized in that: the chemical composition of described calcium-silicon powder comprises by weight percentage: calcium-silicon 20%, chrome green 20%, silica 30%, carbon black 2%; Wherein the main component of calcium-silicon comprises Si60%, Ca28%, and all the other are Fe, and described calcium-silicon Powder Particle Size requires 0.1mm.
5. stuffing sand as claimed in claim 2, is characterized in that: the chemical composition of described calcium-silicon powder comprises by weight percentage: calcium-silicon 25%, chrome green 25%, silica 35%, carbon black 2.5%; Wherein the main component of calcium-silicon comprises Si61%, Ca29%, and all the other are Fe, and described calcium-silicon Powder Particle Size requires 0.5mm.
6. utilize stuffing sand as claimed in claim 1 to improve a method for automatic casting ratio, it is characterized in that: carry out as follows: 1) cleaning process, first completes roasting procedure by tundish, then foreign material remaining in middle water containing opening are cleaned out; 2) stuffing sand adds water inlet by the portion that wraps from centre, ensures that stuffing sand is evenly filled up from bottom to wrist oral area in the mouth of a river; 3) by molten steel impouring tundish, now agglomeration is played by high temperature condensation in the surface of stuffing sand; 4) way of manual measurement is adopted to judge liquid level, rod iron is used vertically to insert in tundish, the length of extracting rear steel bonding is steel liquid level, when highly reaching 300mm, take away the mouth of a river, below plug, now the sinter layer of stuffing sand breaks because of the extruding of upper steel hydrostatic pressure, and molten steel is cast from the mouth of a river is flowed out.
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| CN104338926B (en) * | 2014-10-24 | 2016-06-29 | 南京钢铁股份有限公司 | A kind of ladle that improves is from watering rate and the method for molten steel degree of purity |
| CN108620547B (en) * | 2018-04-19 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Continuous casting method |
| CN114247877A (en) * | 2021-12-03 | 2022-03-29 | 山东莱钢永锋钢铁有限公司 | Device and method for casting of square billet continuous casting tundish |
| CN114213111B (en) * | 2021-12-30 | 2023-08-11 | 鞍山市和丰耐火材料有限公司 | Aluminum-carbon immersion nozzle for accidents and preparation method |
| CN114273649B (en) * | 2021-12-31 | 2023-06-02 | 北京瑞普同创科技发展有限公司 | Casting technology of sizing quick-change tundish |
| CN114453577B (en) * | 2022-01-25 | 2024-02-13 | 何霞 | Sizing quick-change tundish drainage rod and drainage rod casting process |
| CN114918409A (en) * | 2022-05-19 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Method for adding ladle drainage sand |
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| JPH10137924A (en) * | 1996-11-01 | 1998-05-26 | Toshiba Ceramics Co Ltd | Falling material for immediately opening sliding nozzle hole |
| CN1180902C (en) * | 2002-03-05 | 2004-12-22 | 吴登来 | Draining ageng made of chromium |
| CN1978093A (en) * | 2005-11-29 | 2007-06-13 | 宝山钢铁股份有限公司 | Tundish metallurgy method of increasing molten steel purity |
| CN200963676Y (en) * | 2006-06-27 | 2007-10-24 | 宝山钢铁股份有限公司 | Automatic casting piston for ladle |
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