CN102816037B - A kind of Compound exothermic mixture for high-temperature alloy steel - Google Patents
A kind of Compound exothermic mixture for high-temperature alloy steel Download PDFInfo
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- CN102816037B CN102816037B CN201210267423.0A CN201210267423A CN102816037B CN 102816037 B CN102816037 B CN 102816037B CN 201210267423 A CN201210267423 A CN 201210267423A CN 102816037 B CN102816037 B CN 102816037B
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Abstract
The invention discloses a kind of Compound exothermic mixture for high-temperature alloy steel, it it is through being processed into by the raw material of following weight percents: aluminium scrap powder 10 15%, powdered carbon 4 7%, bentonite 9 11%, flyash 22 30%, ferrum oxide 10 21%, silica 10 12%, fluorite 10 13%, 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 Compound exothermic mixture for high-temperature alloy 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 Compound exothermic mixture for high-temperature alloy 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)、Sodium 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 Compound exothermic mixture for high-temperature alloy 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 Compound exothermic mixture for high-temperature alloy steel，It it is through being processed into by the raw material of following weight percents: aluminium scrap powder 10 15%、Powdered carbon 4 7%、Bentonite 9 11%、Modified coal ash 22-30%、Ferrum oxide 10 21%、Silica 10 12%、Fluorite 10 13%、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: aluminum vanadine powder: 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: aluminium scrap powder 10%, powdered carbon 5%, bentonite 10%, modified coal ash 27%, ferrum oxide 17%, silica 1 1%, fluorite 11%, acidifying graphite 9%.
To directly participate in the pulverulent material bonding agent such as thermit reaction raw material metal magnesium, aluminum 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 Compound exothermic mixture for high-temperature alloy steel，It it is through being processed into by the raw material of following weight percents: aluminium scrap powder 10%、Powdered carbon 5%、Bentonite 10%、Modified coal ash 27%、Ferrum oxide 17%、Silica 1 1%、Fluorite 11%、Acidifying graphite 9%，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: aluminum vanadine powder: 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.Measuring 1200 DEG C of borehole cooling speed of molten steel is 19-22 DEG C minute.
Claims (2)
- null1. a Compound exothermic mixture for high-temperature alloy steel，It is characterized in that，It it is through being processed into by the raw material of following weight percents: aluminium scrap powder 10 15%、Powdered carbon 4 7%、Bentonite 9 11%、Modified coal ash 22-30%、Ferrum oxide 10 21%、Silica 10 12%、Fluorite 10 13%、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: aluminum vanadine powder: 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.
- Compound exothermic mixture for high-temperature alloy 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: aluminium scrap powder 10%, powdered carbon 5%, bentonite 10%, modified coal ash 27%, ferrum oxide 17%, silica 1 1%, fluorite 11%, acidifying graphite 9%.
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| CN102816037B true CN102816037B (en) | 2016-08-03 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104275447B (en) * | 2014-10-08 | 2016-08-17 | 吴江市液铸液压件铸造有限公司 | A kind of exothermic shield and preparation method thereof |
| CN104439125B (en) * | 2014-12-22 | 2016-11-09 | 河南省西保冶材集团有限公司 | The special anticrater agent of stainless steel ingot rising head |
| CN107354263A (en) * | 2017-07-21 | 2017-11-17 | 淅川县三合冶金材料有限公司 | Converter exothermic mixture and its adding technology |
| CN107893145A (en) * | 2017-08-22 | 2018-04-10 | 广西柳钢环保股份有限公司 | Thermal-insulating covering agent |
| CN108913895A (en) * | 2018-08-06 | 2018-11-30 | 邵珠航 | A kind of exothermic mixture of metal smelt and preparation method thereof |
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Effective date of registration: 20190711 Address after: 222000 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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