CN104308106A - Steel ladle covering agent - Google Patents
Steel ladle covering agent Download PDFInfo
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- CN104308106A CN104308106A CN201410522910.6A CN201410522910A CN104308106A CN 104308106 A CN104308106 A CN 104308106A CN 201410522910 A CN201410522910 A CN 201410522910A CN 104308106 A CN104308106 A CN 104308106A
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- covering agent
- ladle covering
- modified starch
- agent according
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a steel ladle covering agent, which is prepared from the following raw materials in parts by weight: 12 to 18 parts of expanded graphite, 22 to 28 parts of organic bentonite, 12 to 18 parts of modified starch, 12 to 16 parts of silicon dioxide, 2 to 4 parts of strontium oxide, 2 to 4 parts of magnesium oxide, 4 to 8 parts of alumina, 3 to 8 parts of vitrified micro bubbles, 11 to 14 parts of rock wool and 12 to 17 parts of fluorite. The steel ladle covering agent is low in carbon content; by the expanded graphite, the organic bentonite and the modified starch, impurities in molten steel can be effectively adsorbed, and a heat-preservation function is realized; by heating of the strontium oxide, magnesium oxide and alumina, heat consumption can be compensated, and heat-preservation time can be prolonged; by the silicon dioxide, vitrified micro bubbles, rock wool and fluorite, a heat-preservation layer can be formed to reduce the heat consumption.
Description
Technical field
The present invention relates to a kind of ladle covering agent, belong to foundary industry technical field.
Background technology
Steel-making ladle mainly transports molten steel to store and keeps liquid steel temperature, due to the needs of continuous casting process development, molten steel time of staying in ladle will extend, and for meeting the technological requirement of subsequent handling, how to keep molten steel ladle temperature and improve steel quality becoming subject matter.Therefore, for preventing ladle molten steel secondary oxidation, reducing temperature drop, the molten steel of suitable temperature being provided to continuous casting, ensureing that it is poured into a mould smoothly, the important role of thermal-insulating covering agent.
Ladle covering agent is added in ladle molten steel surface, take adiabatic heat-insulation as a kind of coverture of its main performance.Three basic functions that it must have are: (1) keeps one layer of heat preservation, adiabatic powdery nitride layer on liquid slag blanket, stop molten steel to air transmission or emittance.Insulation heat-insulating property is the most important technical indicator of ladle covering agent, and tapping temperature can be made to reduce, and saves energy consumption, improves output.(2) contact of isolated molten steel and surrounding air.(3) do not corrode or corrode cylinder-packing less, not crusting after being poured, easily coming off from cylinder-packing.
Application number is that 200910248749.7 " a kind of ladle covering agent and usings method thereof " disclose a kind of ladle covering agent and using method thereof.Coverture forms by weight percentage primarily of following compositions, wherein: calcium-oxide content >=90%, and magnesia+dioxide-containing silica < 8% 91-99%; Calcium carbide calcium carbide content >=70%, calcium oxide < 25% 1-9%; The using method of described a kind of ladle covering agent is: after converter tapping, add ladle covering agent, and its addition is molten steel 1-8Kg per ton, and granularity is 0-100mm.This coverture can reduce temperature drop, and can deoxidation and desulfurization, but fever time is short, and phosphorus content is slightly high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of rising head thermal-insulating covering agent and preparation method thereof is provided.
The present invention is achieved through the following technical solutions:
A kind of ladle covering agent, is made up of the raw material of following weight parts: expanded graphite 12-18 part, organobentonite 22-28 part, modified starch 12-18 part, silica 1 2-16 part, strontium oxide strontia 2-4 part, magnesia 2-4 part, aluminium oxide 4-8 part, glass bead 3-8 part, rock wool 11-14 part and fluorite 12-17 part.
Described a kind of ladle covering agent, described modified starch is obtained by following steps: be dissolved in by starch in the hot water of 40-50 DEG C, add amylase, adjustment PH is 6-7, enzymolysis 60-70min, add sodium metaperiodate, fully be uniformly mixed and obtain suspension, add acrylic acid, reaction 100-120min, filter, obtain modified starch by after the supernatant concentration spraying dry obtained.
Described a kind of ladle covering agent, the amylase added, sodium metaperiodate and acrylic acid weight are respectively the 0.1-0.3% of starch weight, 20-30% and 100-150%.
Described a kind of ladle covering agent, the weight ratio of described strontium oxide strontia, magnesia and aluminium oxide is 1:1:2.
Described a kind of ladle covering agent, described raw material all crosses 300 mesh sieves.
Described a kind of ladle covering agent, the granularity of described coverture is 60-100 μm.
The beneficial effect that the present invention reaches:
Ladle covering agent phosphorus content of the present invention is low; the impurity in molten steel effectively can be adsorbed by expanded graphite, organobentonite and modified starch; and there is the effect of insulation; strontium oxide strontia, magnesia and aluminium oxide can generate heat; offset heat loss; extend temperature retention time, silica, glass bead, rock wool and fluorite can form heat-insulation layer, reduce hear rate.
After testing, coverture viscosity of the present invention is 1.5-1.8Pa*s, and expansion multiple is 1.2-1.5, and at 1500 DEG C, fusing time is 20-28s simultaneously.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Embodiment 1
In the present embodiment; a kind of ladle covering agent; be made up of the raw material of following weight parts: expanded graphite 18 parts, organobentonite 22 parts, modified starch 18 parts, silica 16 parts, strontium oxide strontia 2 parts, 2 parts, magnesia, 4 parts, aluminium oxide, glass bead 3 parts, rock wool 14 parts and 12 parts, fluorite, described raw material all crosses 300 mesh sieves.
Described a kind of ladle covering agent, described modified starch is obtained by following steps: be dissolved in by starch in the hot water of 50 DEG C, add amylase, regulate PH to be 6, enzymolysis 60min, adds sodium metaperiodate, fully be uniformly mixed and obtain suspension, add acrylic acid, reaction 120min, filters, modified starch is obtained by after the supernatant concentration spraying dry obtained, wherein, the amylase added, sodium metaperiodate and acrylic acid weight are respectively 0.3%, 30% and 150% of starch weight.
Wherein, the granularity of described coverture is 100 μm.
After testing, the coverture viscosity of the present embodiment is 1.5Pa*s, and expansion multiple is 1.5, and at 1500 DEG C, fusing time is 28s.
Embodiment 2
In the present embodiment; a kind of ladle covering agent; be made up of the raw material of following weight parts: expanded graphite 12 parts, organobentonite 28 parts, modified starch 12 parts, silica 12 parts, strontium oxide strontia 4 parts, 4 parts, magnesia, 8 parts, aluminium oxide, glass bead 8 parts, rock wool 11 parts and 17 parts, fluorite, described raw material all crosses 300 mesh sieves.
Described a kind of ladle covering agent, described modified starch is obtained by following steps: be dissolved in by starch in the hot water of 40-50 DEG C, add amylase, regulate PH to be 7, enzymolysis 70min, adds sodium metaperiodate, fully be uniformly mixed and obtain suspension, add acrylic acid, reaction 100min, filters, modified starch is obtained by after the supernatant concentration spraying dry obtained, wherein, the amylase added, sodium metaperiodate and acrylic acid weight are respectively 0.1%, 20% and 100% of starch weight.
Wherein, the granularity of described coverture is 60 μm.
After testing, the coverture viscosity of the present embodiment is 1.8Pa*s, and expansion multiple is 1.2, and at 1500 DEG C, fusing time is 20s.
Embodiment 3
In the present embodiment; a kind of ladle covering agent; be made up of the raw material of following weight parts: expanded graphite 16 parts, organobentonite 25 parts, modified starch 16 parts, silica 14 parts, strontium oxide strontia 3 parts, 3 parts, magnesia, 6 parts, aluminium oxide, glass bead 6 parts, rock wool 13 parts and 17 parts, fluorite, described raw material all crosses 300 mesh sieves.
Described a kind of ladle covering agent, described modified starch is obtained by following steps: be dissolved in by starch in the hot water of 40-50 DEG C, add amylase, regulate PH to be 7, enzymolysis 60min, adds sodium metaperiodate, fully be uniformly mixed and obtain suspension, add acrylic acid, reaction 120min, filters, modified starch is obtained by after the supernatant concentration spraying dry obtained, wherein, the amylase added, sodium metaperiodate and acrylic acid weight are respectively 0.1%, 22% and 130% of starch weight.
Wherein, the granularity of described coverture is 80 μm.
After testing, the coverture viscosity of the present embodiment is 1.6Pa*s, and expansion multiple is 1.4, and at 1500 DEG C, fusing time is 26s.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (6)
1. a ladle covering agent; it is characterized in that, be made up of the raw material of following weight parts: expanded graphite 12-18 part, organobentonite 22-28 part, modified starch 12-18 part, silica 1 2-16 part, strontium oxide strontia 2-4 part, magnesia 2-4 part, aluminium oxide 4-8 part, glass bead 3-8 part, rock wool 11-14 part and fluorite 12-17 part.
2. a kind of ladle covering agent according to claim 1, it is characterized in that, described modified starch is obtained by following steps: be dissolved in by starch in the hot water of 40-50 DEG C, add amylase, adjustment PH is 6-7, enzymolysis 60-70min, adds sodium metaperiodate, is fully uniformly mixed and obtains suspension, add acrylic acid, reaction 100-120min, filters, obtains modified starch by after the supernatant concentration spraying dry obtained.
3. a kind of ladle covering agent according to claim 2, is characterized in that, the amylase added, sodium metaperiodate and acrylic acid weight are respectively the 0.1-0.3% of starch weight, 20-30% and 100-150%.
4. a kind of ladle covering agent according to claim 1, is characterized in that, the weight ratio of described strontium oxide strontia, magnesia and aluminium oxide is 1:1:2.
5. a kind of ladle covering agent according to claim 1, is characterized in that, described raw material all crosses 300 mesh sieves.
6. a kind of ladle covering agent according to claim 1, is characterized in that, the granularity of described coverture is 60-100 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410522910.6A CN104308106B (en) | 2014-10-08 | 2014-10-08 | A kind of ladle covering agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410522910.6A CN104308106B (en) | 2014-10-08 | 2014-10-08 | A kind of ladle covering agent |
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| Publication Number | Publication Date |
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| CN104308106A true CN104308106A (en) | 2015-01-28 |
| CN104308106B CN104308106B (en) | 2016-07-06 |
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| CN201410522910.6A Active CN104308106B (en) | 2014-10-08 | 2014-10-08 | A kind of ladle covering agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716844A (en) * | 2017-09-29 | 2018-02-23 | 吴江市液铸液压件铸造有限公司 | A kind of processing technology of automobile output shaft casting |
| CN108127092A (en) * | 2016-12-01 | 2018-06-08 | 铜山县超特有色金属添加剂厂 | A kind of coverture and its preparation process |
| CN112962017A (en) * | 2021-02-03 | 2021-06-15 | 长泰县兴宏驰工贸有限公司 | Smelting process of low-carbon high-sulfur free-cutting steel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4947216A (en) * | 1972-07-12 | 1974-05-07 | ||
| CN1032960A (en) * | 1987-11-04 | 1989-05-17 | 唐国进 | Exothermic, slag trapping and insulating covering agent |
| CN101126114A (en) * | 2007-07-27 | 2008-02-20 | 上海盛宝钢铁冶金炉料有限公司 | Granular charring rice husk thermal insulation agent |
| CN103042182A (en) * | 2012-07-06 | 2013-04-17 | 山国强 | Heat preservation covering agent |
| CN103586426A (en) * | 2013-10-30 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Thermal-insulation cover agent and preparation method thereof |
| CN103801666A (en) * | 2014-02-24 | 2014-05-21 | 江苏苏南重工机械科技有限公司 | High-performance heat-preservation covering agent for thick slab and preparing method of high-performance heat-preservation covering agent |
-
2014
- 2014-10-08 CN CN201410522910.6A patent/CN104308106B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4947216A (en) * | 1972-07-12 | 1974-05-07 | ||
| CN1032960A (en) * | 1987-11-04 | 1989-05-17 | 唐国进 | Exothermic, slag trapping and insulating covering agent |
| CN101126114A (en) * | 2007-07-27 | 2008-02-20 | 上海盛宝钢铁冶金炉料有限公司 | Granular charring rice husk thermal insulation agent |
| CN103042182A (en) * | 2012-07-06 | 2013-04-17 | 山国强 | Heat preservation covering agent |
| CN103586426A (en) * | 2013-10-30 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Thermal-insulation cover agent and preparation method thereof |
| CN103801666A (en) * | 2014-02-24 | 2014-05-21 | 江苏苏南重工机械科技有限公司 | High-performance heat-preservation covering agent for thick slab and preparing method of high-performance heat-preservation covering agent |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108127092A (en) * | 2016-12-01 | 2018-06-08 | 铜山县超特有色金属添加剂厂 | A kind of coverture and its preparation process |
| CN107716844A (en) * | 2017-09-29 | 2018-02-23 | 吴江市液铸液压件铸造有限公司 | A kind of processing technology of automobile output shaft casting |
| CN112962017A (en) * | 2021-02-03 | 2021-06-15 | 长泰县兴宏驰工贸有限公司 | Smelting process of low-carbon high-sulfur free-cutting steel |
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| Publication number | Publication date |
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| CN104308106B (en) | 2016-07-06 |
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Effective date of registration: 20230613 Address after: 528300 No. 3, Row 2, Lihu Industrial Zone, Dazha Village, Lecong Town, Shunde District, Foshan City, Guangdong Province (application for residence) Patentee after: Foshan city Shunde District jahzeiah profile steel Co.,Ltd. Address before: No. 6 Shenta Longjiang Road, Fenhu Economic Development Zone, Wujiang City, Suzhou City, Jiangsu Province, 215213 Patentee before: WU JIANG YE ZHU YE YA JIAN ZHU ZAO Co.,Ltd. |