CN102814474B - A kind of covering slag utilizing the steel-making molding of meerschaum system - Google Patents
A kind of covering slag utilizing the steel-making molding of meerschaum system Download PDFInfo
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- CN102814474B CN102814474B CN201210267438.7A CN201210267438A CN102814474B CN 102814474 B CN102814474 B CN 102814474B CN 201210267438 A CN201210267438 A CN 201210267438A CN 102814474 B CN102814474 B CN 102814474B
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- meerschaum
- flyash
- steel
- covering slag
- making molding
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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
Abstract
The invention discloses a kind of covering slag utilizing the steel-making molding of meerschaum system; its ingredients weight parts is: be basic slag charge with flyash, meerschaum; flyash after calcination is successively sequentially placed in 20 25% sulphuric acid, 16 24% sodium hydroxide solutions; stir 20 22h; then the flyash leached from soda acid immersion, with deionized water rinsing to neutral, and is determined with the test of PH reagent paper; finally filter, dried.The present invention makes raw material types simplify, low unit weight and make meltdown property, spreadability and heat-insulating property be improved, and can the usage amount of effective less steel ingot carbon, and can the usage amount of effective less steel ingot carbon.
Description
Technical field
The present invention relates to steel smelting ingot-casting auxiliary Material Field, particularly to a kind of covering slag utilizing the steel-making molding of meerschaum system.
Background technology
During steel smelting ingot-casting; when betting killed steel; generally placing or hanging covering slag bottom ingot mould or at ingot mould near-bottom, when molten steel is entered by soup road and to contact with covering slag bottom ingot mould, covering slag just floats on molten steel face; owing to the fusing point of covering slag is far below liquid steel temperature; therefore defining liquid slag layer on molten steel face, molten steel constantly enters ingot mould, and molten steel face persistently rises; covering slag continues fusing, is so all wrapped up by one layer of slag film in surface of steel ingot.
Steel smelting ingot-casting covering slag (abbreviation ingot casting powder) has following effect: molten slag layer isolation air prevents secondary oxidation of steel；The field trash floated in slag absorption molten steel；Slag film between die wall and steel ingot promotes surface of steel ingot bright and clean；Granulated slag also acts as insulation effect to molten steel.
Summary of the invention
It is an object of the invention to provide a kind of covering slag utilizing the steel-making molding of meerschaum system, make raw material types simplify, low unit weight and make meltdown property, spreadability and heat-insulating property be improved, and can the usage amount of effective less steel ingot carbon.
For achieving the above object, technical scheme is as follows:
A kind of covering slag utilizing the steel-making molding of meerschaum system, it is characterised in that its ingredients weight parts is:
The raw material components weight portion of covering slag is:
Modified coal ash 45-65
Meerschaum 25-35；
Soda 5-7,
Expanded graphite powder 8-12
Crystalline graphite powder 3-5
Dolomite 5-10；
Aluminum vanadine
2-6
K2O 3-4；
Prepared by described modified coal ash: be by calcination after flyash be successively sequentially placed in 20-25% sulphuric acid, 16-24% sodium hydroxide solution, stirring 20-22h, then the flyash leached from soda acid immersion, with deionized water rinsing to neutral, and determined with the test of PH reagent paper, finally filter, it is dried, then flyash is pressed: Paris white: 1050-1100 DEG C of roasting 1-1.5 hour sent in fluid beds by three kinds of materials by hausmannite stone powder weight ratio 1:0.3-0.5:0.5-0.8, grinds to form nanometer powder after cooling；
Each mixing raw materials is pulverized pelletize the most afterwards obtain.
Possibly together with Fe2O3, addition is 2～4.
Described meerschaum, K2The Task-size Controlling of O is: more than 0.25 millimeter less than 1%, less than 0.044 millimeter no less than 50%.
Compared with prior art; it is an advantage of the current invention that: present invention adds modified coal ash; modified coal ash uses nanometer powder, and structure changes, and has unit weight light; good fluidity; also have the impurity in absorption molten steel, can at high temperature burst and promote the feature of covering slag, also allocate meerschaum into; make covering slag unit weight less than 1/2nd of usual covering slag, improve heat-insulating property.It is simple that covering slag of the present invention has raw material types, and meltdown property is good, and spreadability is good, low unit weight, the feature of good heat insulating.At the phosphorus content molding electrical sheet less than 1%, mold cold pier steel, molding welding wire steel all achieves good using effect.
Detailed description of the invention
The covering slag of the meerschaum system of utilization steel-making molding, the raw material components weight portion of covering slag is:
Modified coal ash 45
Meerschaum 25
Soda 5
Expanded graphite powder 10
Crystalline graphite powder 4
Dolomite 8
Aluminum vanadine
5
K2O 4；
Prepared by described modified coal ash: be by calcination after flyash be successively sequentially placed in 20-25% sulphuric acid, 16-24% sodium hydroxide solution, stirring 20-22h, then the flyash leached from soda acid immersion, with deionized water rinsing to neutral, and determined with the test of PH reagent paper, finally filter, it is dried, then flyash is pressed: Paris white: 1050-1100 DEG C of roasting 1-1.5 hour sent in fluid beds by three kinds of materials by hausmannite stone powder weight ratio 1:0.45:0.65, grinds to form nanometer powder after cooling；
Each mixing raw materials is pulverized pelletize the most afterwards obtain.
The physicochemical property parameter of covering slag is: hemisphere point fusion temperature is 1070～1150 DEG C, and the viscosity at 1250 DEG C is 0.18～0.26Pa s, and recrystallization temperature is 850～1130 DEG C, and solidification temperature is 940～1020 DEG C；
Situation changed the original sentence to by steel before table 1 present invention, and table 2 is that situation changed the original sentence to by the steel after the present invention is implemented in test.
Table 1
| 2010 | April | May | June | July | August | JIUYUE | October | Meansigma methods |
| Product (ton) changed the original sentence to by steel | 356.6 | 88.6 | 32.3 | 318.5 | 316.5 | 125.2 | 236.1 | 171.8 |
Table 2
| 2011 | April | May | June | July | August | JIUYUE | October | Meansigma methods |
| Product (ton) changed the original sentence to by steel | 178.7 | 78.8 | 38.2 | 125.6 | 223.6 | 79.8 | 132.2 | 111.3 |
Through the comparison of table 1 and table 2 it will be seen that the qualification rate that the enforcement of the present invention makes casting billet surface is greatly improved, oven improvement declines to a great extent, and brings significant business efficiency to enterprise.
Claims (2)
1. the covering slag utilizing the steel-making molding of meerschaum system, it is characterised in that its ingredients weight parts is:
The raw material components weight portion of covering slag is:
Modified coal ash 45-65
Meerschaum 25-35
Soda 5-7
Expanded graphite powder 8-12
Crystalline graphite powder 3-5
Dolomite 5-10
Aluminum vanadine 2-6
K2O
3-4
The preparation method of described modified coal ash: be by calcination after flyash be successively sequentially placed in 20-25% sulphuric acid, 16-24% sodium hydroxide solution, stirring 20-22h, then the flyash leached from soda acid immersion, with deionized water rinsing to neutral, and determined with the test of pH reagent paper, finally filter, it is dried, then flyash is pressed: Paris white: 1050-1100 DEG C of roasting 1-1.5 hour sent in fluid beds by three kinds of materials by hausmannite stone powder weight ratio 1:0.3-0.5:0.5-0.8, grinds to form nanometer powder after cooling；
Each mixing raw materials is pulverized pelletize the most afterwards obtain；
Described meerschaum, K2The Task-size Controlling of O is: more than 0.25 millimeter less than 1%, less than 0.044 millimeter no less than 50%.
The covering slag of system steel-making molding the most according to claim 1, it is characterised in that possibly together with Fe2O3, addition is 2～4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210267438.7A CN102814474B (en) | 2012-07-31 | 2012-07-31 | A kind of covering slag utilizing the steel-making molding of meerschaum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210267438.7A CN102814474B (en) | 2012-07-31 | 2012-07-31 | A kind of covering slag utilizing the steel-making molding of meerschaum system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102814474A CN102814474A (en) | 2012-12-12 |
| CN102814474B true CN102814474B (en) | 2016-07-20 |
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| CN201210267438.7A Active CN102814474B (en) | 2012-07-31 | 2012-07-31 | A kind of covering slag utilizing the steel-making molding of meerschaum system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107552746B (en) * | 2017-08-31 | 2020-04-07 | 赣州鼎洋贸易有限公司 | Molten steel heat-insulating agent and heat-insulating agent layer thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937269A (en) * | 1974-04-08 | 1976-02-10 | Crucible Inc | Mold powder composition and method for continuously casting employing the same |
| CN1122734A (en) * | 1994-11-11 | 1996-05-22 | 伍本华 | Composition bentonite protection slag |
| CN1244704C (en) * | 2003-08-04 | 2006-03-08 | 郑州大学 | Light composite steelmaking protective agent (slag) |
| 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 |
| CN1939618A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Protective slag for continuous-casting |
| CN100506433C (en) * | 2006-07-31 | 2009-07-01 | 宝山钢铁股份有限公司 | Carbon-free casting powder for casting steel making die |
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Effective date of registration: 20190712 Address after: 222100 Xiangshi Village, Zhewang Town, Ganyu District, Lianyungang City, Jiangsu Province Patentee after: JIANGSU BINXIN STEEL GROUP CO., LTD. Address before: 243000 Gulu Town Industrial Concentration Zone, Dangtu County, Ma'anshan City, Anhui Province Patentee before: Ma'anshan Lirun Metallurgy Material Co., Ltd. |
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