CN102825217A - Composite heat generating agent for die steel - Google Patents
Composite heat generating agent for die steel Download PDFInfo
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- CN102825217A CN102825217A CN2012102682383A CN201210268238A CN102825217A CN 102825217 A CN102825217 A CN 102825217A CN 2012102682383 A CN2012102682383 A CN 2012102682383A CN 201210268238 A CN201210268238 A CN 201210268238A CN 102825217 A CN102825217 A CN 102825217A
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Abstract
The invention discloses a composite heat generating agent for die steel, which is manufactured by processing the following raw materials in percentage by weight: 14-22% of magnesium powder, 9-11% of sodium nitrate, 22-30% of modified fly ash, 10-21% of brown iron oxide, 10-12% of silicon dioxide, 10-13% of sodium fluosilicate and 6-10% of acidized graphite; and the modified fly ash is formed by sequentially placing fly ash after being burnt in 20-25% sulphuric acid and 16-24% sodium hydroxide solution, stirring for 20-22hours, and then washing the fly ash filtered from a soda-acid immersion liquid with deionized water till being neutral, and determining by using PH test paper to test, and finally filtering and dry processing. The fly ash is modified, the dispersivity and surface area are increased, the heating and heat-insulating properties are further promoted, and simultaneously nano-ore powder further achieves the effect of purifying liquid steel.
Description
Technical field
The present invention relates to weathering steel and smelt, be specifically related to a kind of mould steel and use composite heating agent with a kind of metallurgical stone product.
Background technology
The early 1980s, China's metallurgical industry weathering steel ingot head shrink-proof products for the insulation type shrink pore-forming agent, the anti-cratering agent only insulation effect, almost no heat, ingot serious head shrink, cast bear grudge finished product rate .Get into the nineties, metallurgical stone producer is according to the thermit reaction principle, with metallic aluminium (Al), sodium nitrate NaNO3), iron powder (Fe2O3), wood chip, expanded graphite material development and designs such as (acidifying graphite) go out powdery fever type anticrater agent; Be called for short exothermic mixture, the composite acidifying graphite material that expanded by heating is arranged in this kind product, use is not only generated heat but also be incubated; Have double action, this product prevents that than the anticrater agent product ingot casting head contractive effect from having clear improvement, and expands immediately but this kind exothermic mixture touches molten steel after dropping into ingot casting cap mouth; Make the total volume expansion of exothermic mixture more than 2.5 times, exothermic mixture expansion earlier just ignition heating then, the exothermic mixture burning velocity after the volumetric expansion obviously weakens; According to the chemical reaction equilibrium principle; Expand 2.5 times, concentration of reactants is promptly diluted 2.5 times, and reaction speed weakens 2.5 times; Burning is not concentrated; The heating temp difficulty can be brought up to 1550 ° of ingot casting melting point temperature more than the C, can not realize the secondary fusion feeding effect of cap mouth ingot casting fully, and this kind exothermic mixture does not give full play of ideal role.
Summary of the invention
After solving the volumetric expansion of powdery exothermic mixture, obviously weaken reaction speed, heating temp hangs down this shortcoming, and the present invention produces a kind of mould steel of development and uses composite heating agent, has solved the problem that the powdery exothermic mixture exists.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of mould steel is used composite heating agent; Be to be processed into: magnesium powder 14-22%, sodium nitrate 9-11%, modified coal ash 22-30%, brown iron oxide 10-21%, silica 1 0-12%, prodan 10-13%, acidifying graphite 6-10% by the raw material process of following percentage by weight; 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; Extremely neutral with deionized water rinsing; And confirm filtration at last, drying with PH test paper test; Then by flyash: hausmannite stone: blanc fixe 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.
Said exothermic mixture is to be processed into by the raw material process of following percentage by weight: magnesium powder 18%, sodium nitrate 10%, modified coal ash 27%, brown iron oxide 15%, silica 1 1%, prodan 11%, acidifying graphite 8%.
To participate in pulverulent materials such as thermit reaction raw material metal magnesium, sodium nitrate, Iron Ore Powder directly combines with bond; Be pressed into the spheroid of a certain size specification with 60 tons of two huge rock friction presses; Each spheroid is respectively charged in the woven bag (only adorns one); The acidifying graphite of the last composite again ormal weight of packing into (be about spheroid weight 8%), tying packing then.Spheroid weight size is to confirm according to ingot casting weight size, is generally 1kg, 1.5kg and 2kg.
In the steel-making casting process, molten steel slowly is raised to mold top portion cap oral area position along ingot mold at the bottom of ingot mold, stop to water steel then; Molten steel rapid solidification shrinkage in mould owing to solidify around the cap mouth at present, solidify cap mouth center molten steel after; Cap oral area position ingot casting head forms " V " font and shrinks, and before not being completed into " V " font, drops into one bag of this ball composite heating agent product to this cap mouth place; The acidifying graphite insulation of expanding rapidly at spheroid place this moment, after spheroid contacted molten steel or solidifies red-hot steel billet, violent combustion heating began to light a fire; Actual combustion temperature reaches 1600 ° more than the C; After making the steel billet that has solidified around the cap mouth, the violent combustion heating that begins to light a fire, the bottom that makes the strand refuse of having solidified around the cap mouth add to " V " shape; And then the acidifying graphite that expands insulation slowly solidifies down, realized that fully the cap mouth prevents the shrinkage cavity purpose.
The present invention solves the production Technology scheme that its technical problem adopts: participate in aluminium directly and the powdery raw material of thermal response and organic bond are allocated into by technological proportioning and stirred in the mixer various; Be transported to the spheroid that is pressed into certain specification in 60 tons of two huge rock friction presses then; Each spheroid is respectively charged into respectively in the woven bag (only adorns one); The acidifying graphite of the last composite again ormal weight of packing into (be about spheroid weight 8%), tying packing warehouse-in then.
The invention has the beneficial effects as follows: ball composite heating agent has solved traditional exothermic mixture and has weakened thermit reaction speed because of proportioning acidifying graphite expansion, and heating temp is undesirable, and shrinkage cavity is dark, and lumber recovery hangs down problem.This ball composite heating agent is swift in response, and temperature can up to 1600 ° more than the C, realize secondary feeding effect fully, and the strand head forms good " butterfly " and shrinks, and the strand lumber recovery has improved more than 5%.The present invention adopts flyash modified, increases its dispersiveness and surface area, has further promoted heating and heat-insulating property, and the nano ore powder can also play the effect of purify hot metal simultaneously.
Physical index
Firing temperature >=900 ° C
Ignition temperature >=1600 ° C.
The specific embodiment
A kind of mould steel is used composite heating agent; Be to be processed into: magnesium powder 18%, sodium nitrate 10%, modified coal ash 27%, brown iron oxide 15%, silica 1 1%, prodan 11%, acidifying graphite 8% by the raw material process of following percentage by weight; 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; Extremely neutral with deionized water rinsing; And confirm filtration at last, drying with PH test paper test; Then by flyash: hausmannite stone: blanc fixe 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.The present invention adopts flyash modified, increases its dispersiveness and surface area, has further promoted heating and heat-insulating property, and the nano ore powder can also play the effect of purify hot metal simultaneously.Measure 1300 ℃ of following rate of temperature fall of molten steel and be 21-25 ℃ ∕ minute.
Claims (2)
1. a mould steel is used composite heating agent; It is characterized in that, be to be processed into by the raw material process of following percentage by weight: magnesium powder 14-22%, sodium nitrate 9-11%, modified coal ash 22-30%, brown iron oxide 10-21%, silica 1 0-12%, prodan 10-13%, acidifying graphite 6-10%, 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: hausmannite stone: blanc fixe 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.
2. mould steel according to claim 1 is used composite heating agent, it is characterized in that said exothermic mixture is to be processed into by the raw material process of following percentage by weight: magnesium powder 18%, sodium nitrate 10%, modified coal ash 27%, brown iron oxide 15%, silica 1 1%, prodan 11%, acidifying graphite 8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102682383A CN102825217A (en) | 2012-07-31 | 2012-07-31 | Composite heat generating agent for die steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102682383A CN102825217A (en) | 2012-07-31 | 2012-07-31 | Composite heat generating agent for die steel |
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| CN102825217A true CN102825217A (en) | 2012-12-19 |
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| CN2012102682383A Pending CN102825217A (en) | 2012-07-31 | 2012-07-31 | Composite heat generating agent for die steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966846A (en) * | 2017-03-24 | 2017-07-21 | 王星河 | Composite heating agent for weathering steel |
Citations (10)
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| CN85102474A (en) * | 1985-04-01 | 1986-09-24 | 山东省北墅生建石墨矿 | Insulating agent for steel ingot in-gate |
| CN1040527A (en) * | 1988-08-23 | 1990-03-21 | 孙孟全 | Composite heat-insulating and heating cover of casting head |
| JPH083609A (en) * | 1994-06-17 | 1996-01-09 | Topy Ind Ltd | Heat insulating material for steel making |
| CN1118291A (en) * | 1994-09-09 | 1996-03-13 | 叶和辉 | Floss collecting agent for temperature isolation |
| CN1669632A (en) * | 2004-12-29 | 2005-09-21 | 上海交通大学 | Method for preparing active fly ash phosphorus adsorbent |
| CN101045599A (en) * | 2007-04-30 | 2007-10-03 | 重庆大学 | Method for treating sludge heavy metal |
| 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 |
| CN102091758A (en) * | 2011-02-24 | 2011-06-15 | 河南省鑫龙冶材集团有限公司 | Novel die cast cap port sphere composite heating agent and production method thereof |
| 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 |
| CN102351554A (en) * | 2011-09-20 | 2012-02-15 | 水建龙 | Cast riser heat insulation agent |
-
2012
- 2012-07-31 CN CN2012102682383A patent/CN102825217A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102474A (en) * | 1985-04-01 | 1986-09-24 | 山东省北墅生建石墨矿 | Insulating agent for steel ingot in-gate |
| CN1040527A (en) * | 1988-08-23 | 1990-03-21 | 孙孟全 | Composite heat-insulating and heating cover of casting head |
| JPH083609A (en) * | 1994-06-17 | 1996-01-09 | Topy Ind Ltd | Heat insulating material for steel making |
| CN1118291A (en) * | 1994-09-09 | 1996-03-13 | 叶和辉 | Floss collecting agent for temperature isolation |
| CN1669632A (en) * | 2004-12-29 | 2005-09-21 | 上海交通大学 | Method for preparing active fly ash phosphorus adsorbent |
| CN101045599A (en) * | 2007-04-30 | 2007-10-03 | 重庆大学 | Method for treating sludge heavy metal |
| 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 |
| CN102091758A (en) * | 2011-02-24 | 2011-06-15 | 河南省鑫龙冶材集团有限公司 | Novel die cast cap port sphere composite heating agent and production method thereof |
| 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 |
| CN102351554A (en) * | 2011-09-20 | 2012-02-15 | 水建龙 | Cast riser heat insulation agent |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966846A (en) * | 2017-03-24 | 2017-07-21 | 王星河 | Composite heating agent for weathering steel |
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Application publication date: 20121219 |