CN102825246A - Covering slag for steelmaking die casting by using fly ash - Google Patents
Covering slag for steelmaking die casting by using fly ash Download PDFInfo
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- CN102825246A CN102825246A CN2012102710330A CN201210271033A CN102825246A CN 102825246 A CN102825246 A CN 102825246A CN 2012102710330 A CN2012102710330 A CN 2012102710330A CN 201210271033 A CN201210271033 A CN 201210271033A CN 102825246 A CN102825246 A CN 102825246A
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- covering slag
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Abstract
The invention discloses covering slag for steelmaking die casting by using fly ash. The covering slag comprises the following components in parts by weight: modified fly ash is included as basic slag; the fired fly ash is placed into 20-25 percent hydrochloric acid and 15-20 percent sodium hydroxide solution in sequence and is stirred for 20-24 hours; then the fly ash is filtered from acid-base extract, is washed to be neutral with de-ionized water and is tested by using PH (Potential Of Hydrogen) test paper for determination; and finally filtration and drying treatment are performed. According to the covering slag, the types of the raw materials are simplified, the unit weight is low, the melting performance, the spreadability and the thermal insulation performance are improved, and the using amount of steel ingot carbon can be effectively reduced.
Description
Technical field
The ingot casting that the present invention relates to make steel is used the auxiliary material field, particularly a kind of covering slag that utilizes flyash system steel-making die casting.
Background technology
In steel-making ingot casting process, when making a bet killed steel, place or hang covering slag in the ingot mould bottom or near the ingot mould bottom usually; When molten steel contacted with covering slag through entering ingot mould bottom, soup road, covering slag just floated on the molten steel face, because the fusing point of covering slag is far below liquid steel temperature; Therefore on the molten steel face, formed liquid slag layer, molten steel constantly gets into ingot mould, and the molten steel face continues to rise; Covering slag continues fusing, is all wrapped up by one deck slag film in surface of steel ingot like this.
The steel-making ingot casting has following effect with covering slag (being called for short the die casting covering slag): the molten slag layer secluding air prevents secondary oxidation of steel; The field trash that floats in the slag absorption molten steel; Slag film between die wall and steel ingot impels surface of steel ingot bright and clean; Granulated slag also plays insulation effect to molten steel.
Covering slag is made up of three parts usually, promptly contains CaO, SiO
2, Al
2O
3Basic slag charge Deng oxide; Regulate covering slag fusing point, viscosity, contain Na
2The flux of composition such as O, F; Regulate the carbon material of covering slag burn-off rate.
Carbon material in the covering slag is graphite, carbon black, coke powder etc., and addition is 10%～30%, and it prevents outside the covering slag sintering except regulating burn-off rate, can also improve the spreadability of covering slag, strengthens insulation effect.But the carbon material in the covering slag usually causes the local carburetting of steel ingot.Not molten covering slag directly contacts with molten steel in the ingot mould bottom; Carbon dissolution in the covering slag causes carburetting in molten steel; Molten steel rises to the ingot body and cap mouth intersection granulated slag is assembled and is detained at this; Granulated slag contacts with red heat ingot body with molten steel and causes carburetting, the center carburetting that causes at the mass transfer of the cap portion of molten steel final set zone carbon.So the local carburetting defective of the steel ingot that covering slag causes for die casting mild steel is unavoidable often.Less than 1% steel grade, must use the privacy protection slag for those phosphorus content.
Summary of the invention
The purpose of this invention is to provide a kind of covering slag that utilizes flyash system steel-making die casting, raw material types is oversimplified, low unit weight and meltdown property, spreadability and heat-insulating property are improved, and use amount that can effective less steel ingot carbon.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of covering slag that utilizes flyash system steel-making die casting is characterized in that its ingredients weight parts is:
The raw material components weight portion of covering slag is:
Modified coal ash 45-65
Expanded perlite 15-25;
Soda ash 6-8
Expanded graphite powder 10-12
Crystalline graphite powder 2-4
Hausmannite stone 8-10;
Potassic feldspar 4-6;
Said modified coal ash preparation: be that the flyash after the calcination is successively placed 20-25% sulfuric acid, 16-24% sodium hydroxide solution successively; Stir 20-22h; The flyash that from the soda acid immersion liquid, leaches then, and is tested with the PH test paper and to be confirmed to neutral with deionized water rinsing; Filter at last; Drying, then by flyash: wollastonite in powder: dolomite dust weight ratio 1:0.3-0.5:0.5-0.8 with three kinds of materials send in the fluid bed 1050-1100 ℃ roasting 1-1.5 hour, grind to form nanometer powder after the cooling;
Granulation is pulverized in the even back of each mixing raw materials to be obtained.
Described carbon-free casting powder for casting steel making die is characterized in that, the granularity of said hausmannite stone and potassic feldspar is controlled to be: greater than 0.25 millimeter be less than 1%, less than 0.044 millimeter be no less than 50%.
The present invention adds the expanded perlite purpose for reducing the unit weight of covering slag, improves the heat-insulating property of covering slag, reduces the unit weight of covering slag.Expanded perlite is a kind of use ultralight matter construction material widely, is obtained through expansion process by natural minerals, and its unit weight is merely 0.01 grams per cubic centimter, contains SiO
2, Al
2O
3Expanded perlite add constantly fusing in the molten steel as covering slag, finally become the part of slag.The fusing point of expanded perlite itself is very low, too much can reduce the fusing point of covering slag like addition, makes the covering slag fusing too fast, at the molten solid-state covering slag of molten steel face, can influence the heat-insulating property of covering slag so on the contrary.
The granularity of above-mentioned raw materials is controlled at: particle diameter is greater than 1% (promptly 60 order oversizes are less than 1%) that be less than of 0.25 millimeter, and particle diameter is less than 50% (promptly 300 order oversizes are less than 50%) that be no less than of 0.044 millimeter.Waft bead footpath 100% less than 0.36 millimeter.Moisture after the raw material stoving is less than 0.5%.Be packaged into bag after above-mentioned raw materials fully is mixed.Certain particle can guarantee raw material blending, and fusing back slag composition is even.Moisture after the raw material stoving is less than 0.5%, prevents that covering slag from luming because of moist, thus the spreadability when influence the covering slag use.
Compared with prior art, the invention has the advantages that: the present invention has added modified coal ash, and it is light that modified coal ash has unit weight; Good fluidity, good dispersion, good heat insulating; The impurity ability that can adsorb in the molten steel is good, and explosion at high temperature promotes the characteristics of covering slag, also allocates expanded perlite into; Make covering slag unit weight less than 1/2nd of common covering slag, improved 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 characteristics of good heat insulating.Less than 1% die casting electrical sheet, the cold pier steel of die casting has all been obtained good use actual achievement on the die casting welding wire steel in phosphorus content.
The specific embodiment
A kind of covering slag that utilizes flyash system steel-making die casting, the raw material components weight portion of covering slag is:
Modified coal ash 65
Expanded perlite 25;
Soda ash 6
Expanded graphite powder 10
Crystalline graphite powder 3
Hausmannite stone 8
Potassic feldspar 4;
Said modified coal ash preparation: be that the flyash after the calcination is successively placed 20-25% sulfuric acid, 16-24% sodium hydroxide solution successively; Stir 20-22h; The flyash that from the soda acid immersion liquid, leaches then, and is tested with the PH test paper and to be confirmed to neutral with deionized water rinsing; Filter at last; Drying, then by flyash: wollastonite in powder: dolomite dust weight ratio 1:0.4:0.8 with three kinds of materials send in the fluid bed 1050-1100 ℃ roasting 1-1.5 hour, grind to form nanometer powder after the cooling;
Granulation is pulverized in the even back of each mixing raw materials to be obtained.
Expanded perlite is a kind of ultralight matter construction material, is obtained through expansion process by natural minerals, and its unit weight is 0.01 gram per centimeter
3, the granularity of wollastonite, expanded perlite and carbon black is controlled to be: greater than 0.25 millimeter be less than 1%, less than 0.044 millimeter be no less than 50%.
The physicochemical property parameter of covering slag is: hemisphere point fusion temperature is 1085～1170 ℃, and the viscosity under 1250 ℃ is 0.17～0.29Pas, and recrystallization temperature is 870～1150 ℃, and setting temperature is 960～1040 ℃.
Claims (2)
1. a covering slag that utilizes flyash system steel-making die casting is characterized in that,
The raw material components weight portion of covering slag is:
Modified coal ash 45-65
Expanded perlite 15-25;
Soda ash 6-8
Expanded graphite powder 10-12
Crystalline graphite powder 2-4
Hausmannite stone 8-10;
Potassic feldspar 4-6;
Said modified coal ash preparation: be that the flyash after the calcination is successively placed 20-25% sulfuric acid, 16-24% sodium hydroxide solution successively; Stir 20-22h; The flyash that from the soda acid immersion liquid, leaches then, and is tested with the PH test paper and to be confirmed to neutral with deionized water rinsing; Filter at last; Drying, then by flyash: wollastonite in powder: dolomite dust weight ratio 1:0.3-0.5:0.5-0.8 with three kinds of materials send in the fluid bed 1050-1100 ℃ roasting 1-1.5 hour, grind to form nanometer powder after the cooling; Granulation is pulverized in the even back of each mixing raw materials to be obtained.
2. carbon-free casting powder for casting steel making die according to claim 1 is characterized in that, the granularity of said hausmannite stone and potassic feldspar is controlled to be: greater than 0.25 millimeter be less than 1%, less than 0.044 millimeter be no less than 50%.
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| CN2012102710330A CN102825246A (en) | 2012-07-31 | 2012-07-31 | Covering slag for steelmaking die casting by using fly ash |
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|---|---|---|---|
| CN2012102710330A CN102825246A (en) | 2012-07-31 | 2012-07-31 | Covering slag for steelmaking die casting by using fly ash |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318677A (en) * | 2018-12-13 | 2020-06-23 | 洪江市三兴冶金炉料有限责任公司 | Stainless steel mold casting covering slag |
| CN111318676A (en) * | 2018-12-13 | 2020-06-23 | 洪江市三兴冶金炉料有限责任公司 | High-speed steel die casting covering slag and preparation method thereof |
| CN115305315A (en) * | 2022-08-30 | 2022-11-08 | 湖北百瑞新材料有限公司 | Protective slag material for plastic die steel casting and application thereof |
Citations (8)
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|---|---|---|---|---|
| US3708314A (en) * | 1970-08-12 | 1973-01-02 | Sumitomo Metal Ind | Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process |
| CN1096472A (en) * | 1993-06-16 | 1994-12-21 | 淄博市冶金保护材料厂 | Ingot protection slag for red mud steel smelting |
| CN1122734A (en) * | 1994-11-11 | 1996-05-22 | 伍本华 | Composition bentonite protection slag |
| CN1580292A (en) * | 2003-08-04 | 2005-02-16 | 郑州大学 | Light composite steelmaking protective agent (slag) |
| CN1669632A (en) * | 2004-12-29 | 2005-09-21 | 上海交通大学 | Preparation method of activated fly ash phosphorus adsorbent |
| CN101045599A (en) * | 2007-04-30 | 2007-10-03 | 重庆大学 | Method for treating sludge heavy metal |
| CN101116906A (en) * | 2006-07-31 | 2008-02-06 | 宝山钢铁股份有限公司 | Carbon-free casting powder for casting steel making die |
| CN102329125A (en) * | 2011-06-24 | 2012-01-25 | 淮阴工学院 | Method for preparing high-strength expanded ceramsite by modification of coal ash with hydrothermal method |
-
2012
- 2012-07-31 CN CN2012102710330A patent/CN102825246A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3708314A (en) * | 1970-08-12 | 1973-01-02 | Sumitomo Metal Ind | Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process |
| CN1096472A (en) * | 1993-06-16 | 1994-12-21 | 淄博市冶金保护材料厂 | Ingot protection slag for red mud steel smelting |
| CN1122734A (en) * | 1994-11-11 | 1996-05-22 | 伍本华 | Composition bentonite protection slag |
| CN1580292A (en) * | 2003-08-04 | 2005-02-16 | 郑州大学 | Light composite steelmaking protective agent (slag) |
| CN1669632A (en) * | 2004-12-29 | 2005-09-21 | 上海交通大学 | Preparation method of activated fly ash phosphorus adsorbent |
| CN101116906A (en) * | 2006-07-31 | 2008-02-06 | 宝山钢铁股份有限公司 | Carbon-free casting powder for casting steel making die |
| CN101045599A (en) * | 2007-04-30 | 2007-10-03 | 重庆大学 | Method for treating sludge heavy metal |
| CN102329125A (en) * | 2011-06-24 | 2012-01-25 | 淮阴工学院 | Method for preparing high-strength expanded ceramsite by modification of coal ash with hydrothermal method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318677A (en) * | 2018-12-13 | 2020-06-23 | 洪江市三兴冶金炉料有限责任公司 | Stainless steel mold casting covering slag |
| CN111318676A (en) * | 2018-12-13 | 2020-06-23 | 洪江市三兴冶金炉料有限责任公司 | High-speed steel die casting covering slag and preparation method thereof |
| CN111318677B (en) * | 2018-12-13 | 2021-07-27 | 洪江市三兴冶金炉料有限责任公司 | Stainless steel mold casting covering slag |
| CN115305315A (en) * | 2022-08-30 | 2022-11-08 | 湖北百瑞新材料有限公司 | Protective slag material for plastic die steel casting and application thereof |
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Application publication date: 20121219 |