CN101642799B - Molded cap ball composite heating agent and production process thereof - Google Patents
Molded cap ball composite heating agent and production process thereof Download PDFInfo
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- CN101642799B CN101642799B CN 200910065963 CN200910065963A CN101642799B CN 101642799 B CN101642799 B CN 101642799B CN 200910065963 CN200910065963 CN 200910065963 CN 200910065963 A CN200910065963 A CN 200910065963A CN 101642799 B CN101642799 B CN 101642799B
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Abstract
The invention discloses a molded cap ball composite heating agent and a production process thereof. The molded cap ball composite heating agent is mainly characterized by being prepared by processing the following raw materials: aluminum powder, sodium nitrate, ferric oxide powder, fluorite powder and acidified graphite. The production process comprises the following steps: proportioning and stirring the raw materials; pressing the mixture in a spherical mold in a double-pan friction press of 60 tons by a high-pressure screw machine to mold at high pressure; pushing the molded ball out of themold by the press to primarily package; and accurately measuring and proportioning a standard required amount of acidified graphite to secondarily package. The invention solves the problems of reduced thermite reaction speed, non-ideal heating temperature, deep shrinkage cavity and low yield of a traditional heating agent due to expansion after compounding the acidified graphite. The ball composite heating agent has rapid reaction and higher heating temperature of over 1600 DEG C, fully achieves secondary feeding effect, forms phialiform shrinkage at the head of a casting blank and improves the yield of the casting blank by more than 5 percent.
Description
Affiliated technical field
The present invention relates to the field of metallurgy molded cap and prevent that the contraction of the ingot casting head degree of depth with a kind of metallurgical stone product, is specifically related to compound exothermic mixture of a kind of molded cap ball and production technology thereof.
Background technology
At the initial stage eighties, China's metallurgy industry molded cap ingot casting head uses the anti-product that shrinks to be the thermal-insulating type anticrater agent, and this anticrater agent has only insulation effect, does not generate heat basically, and the ingot casting head shrinks serious, and the strand lumber recovery is low.Get into the nineties, metallurgic auxiliary materials producer is according to the thermit reaction principle, with metallic aluminium (Al), sodium nitrate (NaNO
3), iron powder (Fe
2O
3), wood chip, expanded graphite material development and designs such as (acidifying graphite) go out powdery fever type anticrater agent, is 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, and has double action, and this product prevents that than the anticrater agent product ingot casting head contractive effect from having clear improvement; But this kind exothermic mixture touches molten steel after dropping into ingot casting cap mouth expands immediately, makes the exothermic mixture overall volume expansion more than 2.5 times, exothermic mixture expansion earlier just ignition heating then; Exothermic mixture burning velocity after the volumetric expansion obviously weakens, and according to the chemical reaction equilibrium principle, expands 2.5 times; Concentration of reactants is promptly diluted 2.5 times; Reaction speed weakens 2.5 times, and burning is not concentrated, and the heating temp difficulty can be brought up to ingot casting melting point temperature more than 1550 ℃; Can not realize the secondary fusion feeding effect of cap mouth ingot casting fully, 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 development compound exothermic mixture of a kind of molded cap ball and production technology thereof, has solved the problem that the powdery exothermic mixture exists.
For achieving the above object, the compound exothermic mixture of molded cap ball according to the invention is to be processed into by the raw material process of following percentage by weight: aluminium powder 15-20%, sodium nitrate 8-13%, brown iron oxide 32-51%, fluorite powder 20-25%, acidifying graphite 6-10%.
For obtaining product of the present invention; The production technology that the present invention takes is: aluminium powder, sodium nitrate, brown iron oxide, the fluorite powder of said percentage by weight are accurately measured by said percentage by weight; Every batch of gross weight is 500kg, is transported to respectively in the planet kolleroang to stir 20 minutes, and the mixture that will accurately measure then is conveyed into and continues in the planet kolleroang to stir 30 minutes; Stir qualified compound in conveyer belt is transported to the high-pressure spiral machine; Compound is pressed into 60 tons of spherical mould inner high voltage moulding in two huge rock friction presses through the high-pressure spiral machine, and the spheroid of moulding is released mould through forcing press, sends into then in conveyor delivery to the time packing machine and once packs; Once accurately measure the acidifying graphite of allocating the standard-required amount into after the packing again and carry out the secondary check packing, the examination and test of products warehouse-in after the packing.
The present invention solves the spheroid complex technique scheme that its technical problem adopts: will participate in pulverulent materials such as thermit reaction raw material metal aluminium, sodium nitrate, Iron Ore Powder directly and combine 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 cap oral area position from the ingot mold bottom along ingot mold, stops to water steel then; Molten steel rapid solidification shrinkage in mould owing to solidify earlier around the cap mouth, 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 more than 1600 ℃; Slowly solidify under the acidifying graphite insulation of expanding then the bottom that makes the strand refuse of having solidified around the cap mouth add to " V " shape, has realized that fully the cap mouth prevents the shrinkage cavity purpose.
The present invention solves the production Technology scheme that its technical problem adopts: allocate the various powdery raw material of participating in thermit reaction directly and organic bond in the mixer into by technological proportioning and stir; 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 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 composite 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 heating temp can reach more than 1600 ℃, has realized secondary feeding effect fully, and the strand head forms good " dish " and shrinks, and the strand lumber recovery has improved more than 5%.
Molded cap ball composite heating agent product physical and chemical index
The molded cap ball composite heating agent product is with raw material main chemical index
| Al | NaNO 3 | Fe 2O 3 | CaF 2 | Expansion multiple | |
| Aluminium powder | ≥98 | ||||
| Sodium nitrate | ≥98 | ||||
| Brown iron oxide | ≥65 | ||||
| The fluorite powder | ≥90 | ||||
| Acidifying graphite | 100 times |
Description of drawings
Below in conjunction with accompanying drawing, the present invention is further specified.
Fig. 1 is technological process of production figure of the present invention.
The specific embodiment
Referring to accompanying drawing, the compound exothermic mixture of molded cap ball according to the invention is to be processed into by the raw material process of following percentage by weight: aluminium powder 15-20%, sodium nitrate 8-13%, brown iron oxide 32-51%, fluorite powder 20-25%, acidifying graphite 6-10%.
Embodiment 1: the compound exothermic mixture of molded cap ball according to the invention is to be processed into by the raw material process of following percentage by weight: aluminium powder 15%, sodium nitrate 8%, brown iron oxide 49%, fluorite powder 22%, acidifying graphite 6%.
Embodiment 2: the compound exothermic mixture of molded cap ball according to the invention is to be processed into by the raw material process of following percentage by weight: aluminium powder 18%, sodium nitrate 10%, brown iron oxide 41%, fluorite powder 23%, acidifying graphite 8%.
Embodiment 3: the compound exothermic mixture of molded cap ball according to the invention is to be processed into by the raw material process of following percentage by weight: aluminium powder 20%, sodium nitrate 13%, brown iron oxide 32%, fluorite powder 25%, acidifying graphite 10%.
For this reason; The production technology that the present invention takes is: aluminium powder, sodium nitrate, brown iron oxide, fluorite powder, the acidifying graphite raw material of said weight proportion are mixed; Accurately measure (every batch of gross weight is 500kg) by technological mix proportion scheme and be transported to the interior stirring of planet kolleroang 20 minutes respectively,, accurately measure organic bond and be conveyed into the interior continuation stirring of planet kolleroang 30 minutes then by technical scheme; Stir qualified compound in conveyer belt is transported to the high-pressure spiral machine; Compound is pressed into 60 tons of spherical mould inner high voltage moulding in two huge rock friction presses through the high-pressure spiral machine, and the spheroid of moulding is released mould through forcing press, sends into then in conveyor delivery to the time packing machine and once packs; Once accurately measure the acidifying graphite of allocating the standard-required amount into after the packing again and carry out the secondary check packing, the examination and test of products warehouse-in after the packing.
Above said molded cap ball composite heating agent spheroid and the production of composite acidifying graphite and package design principle and this series products production technology all should belong to protection scope of the present invention.
Claims (1)
1. the production technology of a molded cap ball composite heating agent, said molded cap ball composite heating agent is to be processed by the raw material of following percentage by weight: aluminium powder 15-20%, sodium nitrate 8-13%, brown iron oxide 32-51%, fluorite powder 20-25%, acidifying graphite 6-10%; Said production technology is: aluminium powder, sodium nitrate, brown iron oxide, the fluorite powder of said percentage by weight are accurately measured by said percentage by weight; Every batch of gross weight is 500kg; Be transported to respectively in the planet kolleroang and stirred 20 minutes; The mixture that will accurately measure then is conveyed into and continues in the planet kolleroang to stir 30 minutes, stirs qualified compound in conveyer belt is transported to the high-pressure spiral machine, and compound is pressed into 60 tons of spherical mould inner high voltage moulding in two huge rock friction presses through the high-pressure spiral machine; The spheroid of moulding is released mould through forcing press; Send into then in conveyor delivery to the time packing machine and once pack, once accurately measure the acidifying graphite of allocating the standard-required amount into after the packing again and carry out the secondary check packing, the examination and test of products warehouse-in after the packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910065963 CN101642799B (en) | 2009-08-19 | 2009-08-19 | Molded cap ball composite heating agent and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910065963 CN101642799B (en) | 2009-08-19 | 2009-08-19 | Molded cap ball composite heating agent and production process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101642799A CN101642799A (en) | 2010-02-10 |
| CN101642799B true CN101642799B (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910065963 Expired - Fee Related CN101642799B (en) | 2009-08-19 | 2009-08-19 | Molded cap ball composite heating agent and production process thereof |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141530B (en) * | 2010-12-20 | 2012-11-21 | 中钢集团洛阳耐火材料研究院有限公司 | Thermal shock evaluation method for carbon-containing fireproof material for continuous casting |
| CN102091758B (en) * | 2011-02-24 | 2012-12-05 | 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 |
| CN102757240B (en) * | 2011-04-25 | 2013-09-04 | 宝山钢铁股份有限公司 | Heating panel used in steel ingot head heat insulation |
| CN102825224A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite heat generating agent for weathering steel |
| CN102816037B (en) * | 2012-07-31 | 2016-08-03 | 马鞍山科润冶金材料有限公司 | A kind of Compound exothermic mixture for high-temperature alloy steel |
| CN102826944B (en) * | 2012-07-31 | 2016-08-03 | 马鞍山科润冶金材料有限公司 | A kind of Composite exothermic agent for alloy tool steel |
| CN102814476B (en) * | 2012-07-31 | 2016-07-20 | 马鞍山科润冶金材料有限公司 | A kind of attapulgite preparing high-temp steel alloy composite heating agent |
| CN102814475A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Heating agent for casting stainless steel ingot heads and preparation method of heating agent |
| CN102825218A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite exothermic agent for high-manganese wear resistant steel |
| CN102825217A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite heat generating agent for die steel |
| CN103949593B (en) * | 2014-04-22 | 2016-09-07 | 焦作鸽德新材料股份有限公司 | A kind of rising head composite heating agent 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 |
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2009
- 2009-08-19 CN CN 200910065963 patent/CN101642799B/en not_active Expired - Fee Related
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