CN102826944B - A kind of Composite exothermic agent for alloy tool steel - Google Patents
A kind of Composite exothermic agent for alloy tool steel Download PDFInfo
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- CN102826944B CN102826944B CN201210270960.0A CN201210270960A CN102826944B CN 102826944 B CN102826944 B CN 102826944B CN 201210270960 A CN201210270960 A CN 201210270960A CN 102826944 B CN102826944 B CN 102826944B
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- flyash
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- exothermic agent
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Abstract
The invention discloses a kind of Composite exothermic agent for alloy tool steel, it it is through being processed into by the raw material of following weight percents: magnesium powder 14 22%, potassium nitrate 9 11%, flyash 22 30%, brown iron oxide 10 21%, Fluorspar Powder 20 25%, acidifying graphite 6 10%, described flyash be by calcination after flyash be successively sequentially placed into 20 25% sulphuric acid, in 16 24% sodium hydroxide solutions, stir 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, obtain after dried.Manufacture one Composite exothermic agent for alloy tool steel of the present invention, solves the problem that powdery exothermic mixture exists.
Description
Technical field
The present invention relates to a kind of metallurgical stone product of weathering steel smelting, be specifically related to a kind of Composite exothermic agent for alloy tool steel.
Background technology
At the initial stage eighties, China's metallurgy industry weather-proof steel cast head of ingot portion anti-shrinkage product is thermal-insulating type anticrater agent, and this anticrater agent only has insulation effect, do not generates heat, and ingot casting head shrinks serious, and casting lumber recovery is low.nullEnter the nineties，Metallurgical stone producer is according to thermit reaction principle，With metallic aluminium (Al)、Potassium nitrate NaNO3)、Iron powder (Fe2O3)、Wood flour、The design of materials such as expanded graphite (acidifying graphite) develop powdery fever type anticrater agent，It is called for short exothermic mixture，The compounding acidifying graphite material having expanded by heating in this kind of product，Use process is not only generated heat but also be incubated，There is dual function，This product relatively anticrater agent product prevents ingot casting head contractive effect from having clear improvement，But this kind of exothermic mixture touches molten steel after putting into ingot casting cap mouth and expands immediately，Make exothermic mixture entire expanse more than 2.5 times，Exothermic mixture first expands the most just ignition heating，Exothermic mixture burning velocity after volumetric expansion substantially weakens，According to chemical reaction equilibrium principle，Expand 2.5 times，The concentration of reactant i.e. dilutes 2.5 times，Response speed weakens 2.5 times，Burning is not concentrated，Heating temp difficulty can bring up to 1550 ° of more than C of ingot melting some temperature，The secondary fusion feeding effect of cap mouth ingot casting can not be fully achieved，This kind of exothermic mixture does not give full play of ideal role.
Summary of the invention
In order to substantially weaken response speed after solving powdery exothermic mixture volumetric expansion, heating temp this shortcoming low, manufacture one Composite exothermic agent for alloy tool steel of the present invention, solve the problem that powdery exothermic mixture exists.
The technical solution adopted for the present invention to solve the technical problems is:
nullA kind of Composite exothermic agent for alloy tool steel，It it is through being processed into by the raw material of following weight percents: magnesium powder 14 22%、Potassium nitrate 9 11%、Modified coal ash 22-30%、Brown iron oxide 10 21%、Fluorspar Powder 20 25%、Acidifying graphite 6 10%，Prepared by described modified coal ash: be by calcination after flyash be successively sequentially placed into 20-25% sulphuric acid、In 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: calcareous shale: 1050-1100 DEG C of roasting 1-1.5 hour sent in fluid beds by three kinds of materials by quartz sand powder weight ratio 1:0.3-0.5:0.5-0.8，Nanometer powder is ground to form after cooling.
Described exothermic mixture is through being processed into by the raw material of following weight percents: magnesium powder 18%, potassium nitrate 10%, flyash 25%, brown iron oxide 16%, Fluorspar Powder 23%, acidifying graphite 8%.
To directly participate in the pulverulent material bonding agent such as thermit reaction raw material metal magnesium, potassium nitrate, Iron Ore Powder to combine, the spheroid of a certain size specification it is pressed into 60 tons of double huge rock friction presses, each spheroid is respectively charged in woven bag (only filling one), the last compounding acidifying graphite (about the 8% of spheroid weight) loading ormal weight, then Tied bags again.Spheroid weight size is to determine, generally 1kg, 1.5kg and 2kg according to ingot casting weight size.
nullIn steel-making casting process，Molten steel is from being slowly raised to die top portion cap port part at the bottom of ingot mold along ingot mold，Then stop watering steel，Molten steel quick solidification in mould shrinks，Owing to cap mouth surrounding now solidifies，After the molten steel of solidification Mao Kou center，Cap port part ingot casting head forms " V " font and shrinks，Before forming " V " font the most completely，One bag of this ball composite heating agent product is put at this cap mouth，Now acidifying graphite expands rapidly insulation at spheroid，After spheroid contacts molten steel or solidifies red-hot steel billet，Start vigorous combustion heating of lighting a fire，Actual combustion temperature reaches 1600 ° of more than C，After making the steel billet that cap mouth surrounding has solidified，Start vigorous combustion heating of lighting a fire，The strand refuse making cap mouth surrounding solidify adds to the bottom of " V " shape，Then the lower slow solidification of the acidifying graphite insulation of reflation，Fully achieve cap mouth anti-shrinkage cavity purpose.
The present invention solves the production Technology scheme that its technical problem used: various direct participation aluminum, the powderous primary material of thermal response stirs in allocating blender with organic bond into by technology proportioning, the spheroid of certain specification it is pressed in being then delivered to 60 tons of double huge rock friction presses, each spheroid is respectively charged in woven bag respectively (only filling one), the last compounding acidifying graphite (about the 8% of spheroid weight) loading ormal weight, then Tied bags warehouse-in again.
The invention has the beneficial effects as follows: ball composite heating agent solves tradition exothermic mixture and weakens thermit reaction speed because proportioning acidifying graphite expands, and heating temp is undesirable, and shrinkage cavity is deep, the low problem of lumber recovery.This ball composite heating agent is swift in response, and temperature may be up to 1600 ° of more than C, fully achieves secondary feeding effect, and strand head forms good " butterfly " and shrinks, and strand lumber recovery improves more than 5%.The present invention uses flyash modified, increases its dispersibility and surface area, improves heating and heat-insulating property further, and nano ore powder can also play the effect purifying molten steel simultaneously.
Physical index
Firing temperature
≥900°C
Ignition temperature
≥1600°C。
Detailed description of the invention
nullA kind of Composite exothermic agent for alloy tool steel，It it is through being processed into by the raw material of following weight percents: magnesium powder 18%、Potassium nitrate 10%、Modified coal ash 25%、Brown iron oxide 16%、Fluorspar Powder 23%、Acidifying graphite 8%，Prepared by described modified coal ash: be by calcination after flyash be successively sequentially placed into 20-25% sulphuric acid、In 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: calcareous shale: 1050-1100 DEG C of roasting 1-1.5 hour sent in fluid beds by three kinds of materials by quartz sand powder weight ratio 1:0.3-0.5:0.5-0.8，Nanometer powder is ground to form after cooling.The present invention uses flyash modified, increases its dispersibility and surface area, improves heating and heat-insulating property further, and nano ore powder can also play the effect purifying molten steel simultaneously.It is 19-23 DEG C minute that molten steel measures 1200 DEG C of borehole cooling speed.
Claims (2)
- null1. a Composite exothermic agent for alloy tool steel，It is characterized in that，It it is through being processed into by the raw material of following weight percents: magnesium powder 14 22%、Potassium nitrate 9 11%、Modified coal ash 22-30%、Brown iron oxide 10 21%、Fluorspar Powder 20 25%、Acidifying graphite 6 10%，Prepared by described modified coal ash: be by calcination after flyash be successively sequentially placed into 20-25% sulphuric acid、In 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: calcareous shale: 1050-1100 DEG C of roasting 1-1.5 hour sent in fluid beds by three kinds of materials by quartz sand powder weight ratio 1:0.3-0.5:0.5-0.8，Nanometer powder is ground to form after cooling.
- Composite exothermic agent for alloy tool steel the most according to claim 1, it is characterised in that described exothermic mixture is through being processed into by the raw material of following weight percents: magnesium powder 18%, potassium nitrate 10%, modified coal ash 25%, brown iron oxide 16%, Fluorspar Powder 23%, acidifying graphite 8%.
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| CN201210270960.0A CN102826944B (en) | 2012-07-31 | 2012-07-31 | A kind of Composite exothermic agent for alloy tool steel |
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| CN201210270960.0A CN102826944B (en) | 2012-07-31 | 2012-07-31 | A kind of Composite exothermic agent for alloy tool steel |
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| CN102826944A CN102826944A (en) | 2012-12-19 |
| CN102826944B true CN102826944B (en) | 2016-08-03 |
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| CN113307448B (en) * | 2021-05-24 | 2022-12-06 | 东华大学 | Underground water denitrification method and reactor of zero-valent iron autotrophic denitrification coupling biochar PRB |
Citations (7)
| 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 |
| 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) |
| CN1580293A (en) * | 2003-08-04 | 2005-02-16 | 郑州大学 | Multifunctional steel-iron crystal grain thining oxygen-inhibiting covering agent |
| CN101642799A (en) * | 2009-08-19 | 2010-02-10 | 西峡县鑫龙保温材料有限公司 | Molded cap ball composite heating agent and production process thereof |
| CN101798233A (en) * | 2010-02-10 | 2010-08-11 | 河南科技大学 | Riser heating and insulating agent |
| CN102351554A (en) * | 2011-09-20 | 2012-02-15 | 水建龙 | Cast riser heat insulation agent |
-
2012
- 2012-07-31 CN CN201210270960.0A patent/CN102826944B/en active Active
Patent Citations (7)
| 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 |
| 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) |
| CN1580293A (en) * | 2003-08-04 | 2005-02-16 | 郑州大学 | Multifunctional steel-iron crystal grain thining oxygen-inhibiting covering agent |
| CN101642799A (en) * | 2009-08-19 | 2010-02-10 | 西峡县鑫龙保温材料有限公司 | Molded cap ball composite heating agent and production process thereof |
| CN101798233A (en) * | 2010-02-10 | 2010-08-11 | 河南科技大学 | Riser heating and insulating agent |
| CN102351554A (en) * | 2011-09-20 | 2012-02-15 | 水建龙 | Cast riser heat insulation agent |
Non-Patent Citations (2)
| Title |
|---|
| "改性粉煤灰处理氨氮废水实验研究";刘永娟等，;《能源环境保护》;20100831;第24卷(第4期);第16-19，24页 * |
| "新型铸钢冒口覆盖剂的研究";王朝辉;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20080315(第3期);B022-49 * |
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| CN102826944A (en) | 2012-12-19 |
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