CN101871073A - Method for preparing calcium-containing ferroalloy - Google Patents
Method for preparing calcium-containing ferroalloy Download PDFInfo
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- CN101871073A CN101871073A CN 201010210287 CN201010210287A CN101871073A CN 101871073 A CN101871073 A CN 101871073A CN 201010210287 CN201010210287 CN 201010210287 CN 201010210287 A CN201010210287 A CN 201010210287A CN 101871073 A CN101871073 A CN 101871073A
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Abstract
The invention relates to a method for preparing a calcium-containing ferroalloy, which is characterized by comprising the following steps of putting raw materials into a closed smelting furnace to carry out smelting and casting in a closed casting chamber after smelting. Comburent is respectively added into the smelting furnace and the casting chamber in the process of smelting and casting as required so that oxygen content of gases in the smelting furnace and the casting chamber is less than 6 percent by volume or 5 percent by volume of the gases to not support combustion and prevent combustion and oxidation of calcium; a flame retardant is added into the smelting furnace as required to assist in preventing combustion and oxidation of calcium; and the calcium ferroalloy is packaged by vacuum or by pouring an inert gas in a sealing mode or the surface of the alloy is coated with a paraffin wax protective film to prevent pulverization of the alloy. The method for preparing the calcium-containing ferroalloy of the invention effectively reduces combustion and oxidation of calcium and improves content of calcium in the calcium ferroalloy.
Description
Technical field
The present invention relates to a kind of preparation method who contains Ca-Fe alloy, belong to the metallic substance metallurgical technology field.
Background technology
Calcium is alkaline-earth metal, and proportion is 1.54g/cm
3, fusing point is 842 ℃, and boiling point is 1484 ℃, and vapour pressure is 11.33KPa (983 ℃).It has very strong reductibility, and is particularly more strong with oxygen and nitrogen reaction, is good deoxidant element.Calcium is used for deoxidation in steel making, and not only deoxidation effect is good, can also improve the quality of steel.But because its light specific gravity, fusing point is low, can not directly use in steel-making, need make alloy to calcium and iron, the manganese geometric ratio is great, fusing point is high element, but owing to calcium melting burning and oxidation in air are very serious, it is very difficult to make alloy.
It all is open melting and casting that preparation at present contains the method for Ca-Fe alloy, melting and casting are at high temperature carried out, calcium and burning of airborne oxygen and oxidation, therefore the scaling loss of calcium is big, calcic (weight percent about 8% only in the alloy that makes, as follows), and the scaling loss of calcium reaches 60-70%, is difficult to make the calcium in the alloy to reach more than 10%.Yet calcium is less than 10% in the alloy, and its deoxidation effect is not obvious again.Therefore, how to obtain the high Ca-Fe alloy of calcium content (＞10%), and the preparation method of the calcium containing alloy of the scaling loss of minimizing calcium becomes the target that those skilled in the art pursue.
Summary of the invention
The objective of the invention is to solve the big technical problem of calcium scaling loss in the existing calcareous iron alloy preparation process, provide a kind of calcium content the high preparation method who contains Ca-Fe alloy.
The Ca-Fe alloy that contains of the present invention is meant that the alloy of calcic and iron and calcic and iron are main one or more the alloy that also comprises in other elements.As: calcium iron, calcium ferro-aluminum, Ca, Mg and Fe, calcium magnalium iron, calcium aluminium ferromanganese or the like.
Technical scheme of the present invention is: a kind of preparation method who contains Ca-Fe alloy is characterized in that this preparation method may further comprise the steps: raw material is placed in the smelting furnace of sealing and carries out melting, after the melting in the indoor casting of casting of sealing.Make extraneous air can not enter smelting furnace and casting chamber, under the high temperature in smelting furnace, portion gas is discharged the combustiblesubstance burning of bringing in the raw material in addition.Make smelting furnace and the indoor oxygen content of casting remain on the incendiary state of not supporting.
Further, the present invention can be to smelting furnace and the indoor input fuel combustion of casting, and consuming smelting furnace and the indoor oxygen of casting, the content of controlling oxygen in its gas is less than 6% and even 5% of gas volume, thereby reaches the incendiary state of not supporting.Casting is put into fuel in the chamber, when the oxygen level in the casting indoor gas can spontaneous combustion greater than 5% or 6% the time, less than 5% or can go out certainly in 6% o'clock.
As preferably, for auxiliary burning and the oxidation that stops calcium, further, the present invention adds the fire retardant assisting flame-resistant respectively in smelting furnace and casting chamber in melting and casting cycle.
Fire retardant preferably accounts for weight alloy per-cent: greater than 0 less than 10%.The interior calcium of stove is reached do not burn and oxidation, reduce the scaling loss of calcium.
The preparation method of this alloy is further comprising the steps of: alloy melting back well is indoor with the casting that alloy liquid imports sealing by conduit.Avoid alloy liquid to contact, thereby reduce the chance of burning and oxidation with oxygen in the air.
The present invention is for preventing alloy pulverization, and the preparation method who contains Ca-Fe alloy of the present invention after described alloy cast molding, adopts vacuum sealed package; Or as another kind of preferred, injecting inert gas in the Ca-Fe alloy hermetically sealed package perhaps drops into alloy in the paraffin solution, and making the alloy surface coating thickness is the paraffin-protected film of 0.01～1mm.
Described in the alloy hermetically sealed package injecting inert gas account for the 1-20% of weight alloy.
The preparation method who contains Ca-Fe alloy of the present invention owing to adopt closed melting and casting process, the process from melting to casting, contains Ca-Fe alloy liquid and with under the isolate from outer air condition carries out.In smelting furnace during melting because the higher portion gas of temperature discharges out of the furnace, simultaneously in the raw material with the foreign material burning make that oxygen level is reduced to less than 6% or 5% in the furnace gas, reach not support burning.At this moment, can reduce the burning and the oxidation of calcium, reduce the loss of calcium, improve the content of calcium in the alloy.
If the furnace gas oxygen level surpasses aforementioned proportion, can in stove, drop into fuel and burn, oxygen content is controlled at below 6% or 5%, thereby avoids the burning of calcium and oxidation to finish up to melting.In the indoor input fuel combustion of casting of casting forward direction, can burn greater than 5% or 6% the time when oxygen level, can extinguish automatically less than 5% or 6%.Wherein said fuel available gas fuel is as Sweet natural gas, coal gas etc.Also available liquid fuel is as heavy oil, liquefied gas etc.Also can use solid fuel, as paraffin, firewood etc.
In order further to stop calcium burning and oxidation, the present invention is in smelting furnace and the indoor adding fire retardant of casting.The fire retardant kind is more, and the used fire retardant of the present invention comprises: organic fire-retardant: phosphorus system and halogen-phosphorus system, aluminum-magnesium series etc., inorganic combustion inhibitor: phosphorus system etc.As: chlorinated paraffin, red phosphorus, sodium-chlor or the like, when the smelting furnace or the indoor combustion method of passing through of casting, the oxygen level in the gas does not still reach not to be supported quantity combusted to still have combustion phenomena, can drop into fire retardant, assisting flame-resistant.Stop the burning and the oxidation of calcium.Add-on is not burnt according to Ca-Fe alloy and is degree, and general fire retardant accounts for the Ca-Fe alloy weight percent for greater than 0, smaller or equal to 10%.
In order to reach sealing melting of the present invention and casting, its smelting furnace is provided with bell, makes smelting furnace and isolate from outer air after covering bell.Oxygen measuring instrument is housed on bell simultaneously, measures the content of oxygen in the stove.Thermopair is housed on the bell, measures temperature in the stove.Bell is provided with charging opening, for adding fire retardant.Tegillum is arranged on the charging opening, can close at any time and open; The casting chamber is the enclosed chamber that adopts steel plate or make with refractory materials, and the top of casting chamber is provided with charging opening with cover, uses for adding fuel.The casting chamber is provided with closing door, and for picking and placeing mould and finished product, closing door is closed back and isolate from outer air.
The concrete production technique that contains Ca-Fe alloy of the present invention is: by containing Ca-Fe alloy composition requirement batching, the material for preparing is dropped in the smelting furnace, build bell, block iron notch, send and establish the beginning melting by cable.When oxygen level in the furnace gas greater than 5% or 6% the time, ignited fuel is dropped into the stove internal combustion from dog-house successively, finish until melting.Oxygen level in the control furnace gas remains less than 5% or 6%, does not have combustion phenomena.When furnace temperature reached 350 ℃ of 1200-1, alloy material all melted the formation alloy, prepares to come out of the stove.As still have combustion phenomena can in stove, drop into fire retardant, assisting flame-resistant; Came out of the stove preceding 5-10 minute, and the fuel of lighting was put into the casting chamber from the dog-house of casting chamber burn, the oxygen level of casting chamber is kept less than 5% or 6%, till fuel goes out certainly.After preparation work is carried out, open the stove iron notch, alloy liquid is injected the mould casting mold of casting chamber through conduit.After the cooling, the closing door of opening the casting chamber takes out alloy, chemical examination and the tamper seal closure storehouse of packing into.
It should be noted that, the Ca-Fe alloy that contains of the present invention, wherein the fusing point of iron is 1535 ℃, when in the low melting point metals such as it and aluminium, calcium, magnesium, silicon one or more are melt into alloy, difference according to alloying constituent, its eutectic point is reduced to about 1000-1400 ℃, and this temperature does not reach the boiling point (1484 ℃) of calcium as yet, and calcium can not gasify.Because employing is of the present invention above-mentioned in closed smelting furnace and the indoor preparation method of casting, can prevent the oxidation and the burning of calcium effectively simultaneously.Therefore, can improve the content of calcium in the alloy effectively.
Embodiment
Below by specific embodiment explanation the present invention.
Embodiment 1, prepares the calcium ferroaluminium with semiclosed 350KVA middle frequency furnace, and alloying constituent is that Ca 15%, Al 40%, surplus are Fe.The 200kg that always feeds intake in the stove, calcium metal 32kg wherein, metallic aluminium 81kg, steel scrap 87kg.Above-mentioned furnace charge is dropped in the stove, send and establish the beginning melting by cable.In 15 minutes stoves, when smelting temperature is 400 ℃ of left and right sides, build bell, the foreign material burning in the furnace charge (steel scrap) makes the furnace gas oxygen level reach 6%.About 45 minutes, furnace temperature reaches 1350 ℃, and raw material all melts in the stove, prepares to come out of the stove.By conduit alloy liquid is injected sealing casting chamber casting mold.Before coming out of the stove, mould is put well in the casting chamber, at the indoor input clorafin 5kg of casting, closed casting chamber closing door, putting into alloy liquid post chlorization paraffin can automatic combustion.Can extinguish automatically less than 6% the time when the oxygen level of casting in the indoor gas, the calcium in the alloy also can not burn and oxidation.After the cooling of calcium ferroaluminium, open casting chamber closing door, take out the alloy chemical examination.Through chemical examination alloying constituent: Ca 15.12%, Al 39.96%, Fe is surplus.After the alloy cooling, finished product calcium ferroaluminium is packed in the plastics bag, seal after vacuumizing.With the calcium ferroaluminium of method preparation of the present invention, the scaling loss of its Ca only is 5.5%, and adopts the usual way melting, has only 9.36% with content in the amount calcium alloy, and scaling loss is up to 41.5%.Wherein, be used to control smelting furnace and the fuel of the indoor oxygen content of casting is not limited to clorafin, just do not exemplify one by one.
Embodiment 2, produce the calcium aluminum-manganese-iron alloy with the electric furnace of implementing 1, and the alloy target composition is Ca30%, Al 30%, Mn 30%, and surplus is Fe.Be equipped with furnace charge 200kg, calcium 64kg wherein, metallic aluminium 62kg, mid-carbon fe-mn 40kg (containing Mn75%), steel scrap 34kg.Above-mentioned raw materials dropped into to send in the stove establish the beginning melting by cable.Build bell after 15 minutes, when temperature of fusion reaches 400 ℃ in the stove, detect the furnace gas oxygen level about 7%, still have combustion phenomena, in stove, throw fire retardant red phosphorus 1.5kg, assisting flame-resistant.Furnace temperature reached 1300 ℃ in 43 minutes, and alloy all melts.The front opening of coming out of the stove casting chamber closing door is put mould well, shuts closing door.Open the reinforced flap in the chamber of casting, light Sulfur 5kg and input burning notes chamber, build reinforced flap then, the oxygen level of control casting indoor gas is lower than 5%, opens iron notch, by conduit the chamber of casting is sealed in the injection of alloy liquid and is begun casting.After treating the alloy cooling, take out the alloy chemical examination, be through the chemical examination alloying constituent: Ca 29.76%, Al 31.01%, Mn 29.67%, surplus is Fe, it is 7% that Ca gets scaling loss.Finished product calcium aluminum-manganese-iron alloy is packed in the plastics bag of 20kg, inject argon gas 2kg sealing, reinstall and cover the bung warehouse-in in the plastic tank completely.
Embodiment 3, produce the Ca, Mg and Fe alloy with the electric furnace of embodiment 1, and the alloy target composition is that Ca40%, Mg5%, surplus are Fe.Charge composition calcium metal 82kg, MAGNESIUM METAL 10kg, steel scrap 108kg, 200kg altogether.Above-mentioned furnace charge is dropped in the electric furnace, send and establish the beginning melting by cable.After 15 minutes, when furnace temperature reaches 400 ℃, build bell, oxygen level is 8% in the detected gas, still has combustion phenomena in the stove.Import heavy oil and burning from dog-house with conduit this moment in smelting furnace, oxygen content is reduced to below 5%, makes to keep not having combustion phenomena in the stove.After 40 minutes, 1250 ℃ of stove Nei Wenduda, alloy all melts.Mould indoor the putting well of casting, is shut the closing door of casting chamber.The preceding 5 minutes clockwise casting chamber injection heavy oil 5kg that come out of the stove light, and make the indoor oxygen level of casting keep below 5%.Open iron notch, in the mould of casting chamber, inject molten metal by conduit.After the cast molding, through chemical examination alloying constituent Ca39.60%, Mg4.91%, surplus is Fe, the scaling loss of Ca only is 3.4%.To make alloy surface apply the thick paraffin-protected film of 0.2mm in the finished product Ca, Mg and Fe alloy input paraffin solution.With finished product sealing pack, every bag of 20kg, the not efflorescence of protection alloy.
Embodiment 4, produce Ca-Fe alloy with the electric furnace of embodiment 1, and the alloy target composition is that Ca40%, surplus are Fe.Charge composition calcium metal 82kg, steel scrap 118kg, 200kg altogether.Above-mentioned furnace charge is dropped in the electric furnace, send and establish the beginning melting by cable.After 15 minutes, when furnace temperature reached 400 ℃, oxygen level was still about 8% in the detection furnace gas.Build bell, in smelting furnace, import liquefied gas with conduit and light, make oxygen level in the furnace gas, do not have combustion phenomena below 6% from dog-house.After 40 minutes, 1250 ℃ of stove Nei Wenduda, alloy all melts.Come out of the stove before with mould the casting indoor putting well, shut the casting chamber closing door.The preceding 5 minutes clockwise of coming out of the stove casting chamber is injected heavy oil 5kg and is lighted, and makes the indoor oxygen level of casting keep below 6% or 5%.Open iron notch, inject molten metal to the casting chamber by conduit.After the cast molding, meet the composition requirement through the chemical examination alloy, Ca is 39.5%, and surplus is Fe, and the scaling loss of Ca is 3.6%.With finished product sealing pack, every bag of 20kg injects argon gas 4kg in bag, the not efflorescence of protection alloy.
The production method that contains Ca-Fe alloy of the present invention, the scaling loss of its calcium is few, only is 3.4-7%, calcium content increases in the alloy thereby can make, and the content of Ca is greater than 10% in the alloy that employing the method for the invention is produced.With the Ca-Fe alloy that contains of the inventive method production, be the better reductor of a kind of deoxidation effect.
Claims (8)
1. a preparation method who contains Ca-Fe alloy is characterized in that, this preparation method may further comprise the steps: raw material is placed in the smelting furnace of sealing and carries out melting, after the melting in the indoor casting of casting of sealing.
2. the preparation method who contains Ca-Fe alloy according to claim 1 is characterized in that, in melting and when casting, respectively to smelting furnace and the indoor input combustionmaterial of casting, makes oxygen level in smelting furnace and the casting indoor gas less than 6% of gas volume per-cent.
3. the preparation method who contains Ca-Fe alloy according to claim 2 is characterized in that, make smelting furnace and the casting indoor gas in oxygen level less than 5% of gas volume per-cent.
4. the preparation method who contains Ca-Fe alloy according to claim 1 is characterized in that, it adds fire retardant respectively in smelting furnace and casting chamber in melting and casting cycle.
5. the preparation method who contains Ca-Fe alloy according to claim 4 is characterized in that, described fire retardant accounts for the Ca-Fe alloy weight percent and is: greater than 0, smaller or equal to 10%.
6. according to claim 1-5 each described preparation method who contains Ca-Fe alloy wherein, it is characterized in that described preparation method is further comprising the steps of: after alloy is melted in the smelting furnace of sealing, the casting that alloy liquid imports sealing is indoor by conduit.
7. the preparation method who contains Ca-Fe alloy according to claim 6 is characterized in that, after the described alloy cast molding, adopts vacuum sealed package; Or in the Ca-Fe alloy hermetically sealed package injecting inert gas, or with the paraffin-protected film of Ca-Fe alloy surface-coated.
8. the preparation method who contains Ca-Fe alloy according to claim 7 is characterized in that described rare gas element accounts for the 1-20% of weight alloy.
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| CN 201010210287 CN101871073A (en) | 2010-05-12 | 2010-06-28 | Method for preparing calcium-containing ferroalloy |
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| CN201010169856.3 | 2010-05-12 | ||
| CN201010169856 | 2010-05-12 | ||
| CN 201010210287 CN101871073A (en) | 2010-05-12 | 2010-06-28 | Method for preparing calcium-containing ferroalloy |
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| CN 201010210287 Pending CN101871073A (en) | 2010-05-12 | 2010-06-28 | Method for preparing calcium-containing ferroalloy |
| CN2011101134993A Pending CN102242275A (en) | 2010-05-12 | 2011-05-04 | Preparation method of silicon-free calcium and iron-containing alloy |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534084A (en) * | 2010-12-14 | 2012-07-04 | 上海永烨冶金科技发展有限公司 | Calcium iron alloy and production and preparation method thereof |
| CN102851448A (en) * | 2012-09-14 | 2013-01-02 | 虞海香 | Preparation method of steelmaking deoxidizer |
| CN102864280A (en) * | 2012-09-14 | 2013-01-09 | 虞海盈 | Preparation method of steelmaking deoxidizer |
| CN102864281A (en) * | 2012-09-14 | 2013-01-09 | 黄宣斐 | Preparation method of steelmaking deoxidizer calcium-iron alloy |
| CN102876959A (en) * | 2012-09-21 | 2013-01-16 | 虞伟财 | Method for preparing calcium iron alloy |
| CN102888554A (en) * | 2012-09-21 | 2013-01-23 | 虞伟财 | Preparation method of calcium-ferrum alloy |
| CN104313244A (en) * | 2014-10-29 | 2015-01-28 | 杨雯雯 | Preparation method of deoxidizing agent |
| CN110473682A (en) * | 2019-07-19 | 2019-11-19 | 宁波可可磁业股份有限公司 | A kind of neodymium iron boron magnetic body and its preparation process |
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| US3930842A (en) * | 1973-08-21 | 1976-01-06 | Mark Abramovich Ryss | Method of producing alloys based on calcium, silicon and iron |
| CN1299881A (en) * | 2000-12-28 | 2001-06-20 | 赵玉典 | Composite deoxidant for Si-Ba-Ca-Fe alloy and its preparation |
| CN101086028A (en) * | 2007-07-13 | 2007-12-12 | 谢应凯 | Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel |
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2010
- 2010-06-28 CN CN 201010210287 patent/CN101871073A/en active Pending
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2011
- 2011-05-04 CN CN2011101134993A patent/CN102242275A/en active Pending
Patent Citations (3)
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| US3930842A (en) * | 1973-08-21 | 1976-01-06 | Mark Abramovich Ryss | Method of producing alloys based on calcium, silicon and iron |
| CN1299881A (en) * | 2000-12-28 | 2001-06-20 | 赵玉典 | Composite deoxidant for Si-Ba-Ca-Fe alloy and its preparation |
| CN101086028A (en) * | 2007-07-13 | 2007-12-12 | 谢应凯 | Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel |
Non-Patent Citations (1)
| Title |
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| 《材料导报》 19891231 作霖 《硅钙合金和硅钙铁合金的生产与应用趋势》 17 1-8 , 第3期 2 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534084A (en) * | 2010-12-14 | 2012-07-04 | 上海永烨冶金科技发展有限公司 | Calcium iron alloy and production and preparation method thereof |
| CN102851448A (en) * | 2012-09-14 | 2013-01-02 | 虞海香 | Preparation method of steelmaking deoxidizer |
| CN102864280A (en) * | 2012-09-14 | 2013-01-09 | 虞海盈 | Preparation method of steelmaking deoxidizer |
| CN102864281A (en) * | 2012-09-14 | 2013-01-09 | 黄宣斐 | Preparation method of steelmaking deoxidizer calcium-iron alloy |
| CN102876959A (en) * | 2012-09-21 | 2013-01-16 | 虞伟财 | Method for preparing calcium iron alloy |
| CN102888554A (en) * | 2012-09-21 | 2013-01-23 | 虞伟财 | Preparation method of calcium-ferrum alloy |
| CN104313244A (en) * | 2014-10-29 | 2015-01-28 | 杨雯雯 | Preparation method of deoxidizing agent |
| CN110473682A (en) * | 2019-07-19 | 2019-11-19 | 宁波可可磁业股份有限公司 | A kind of neodymium iron boron magnetic body and its preparation process |
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| Publication number | Publication date |
|---|---|
| CN102242275A (en) | 2011-11-16 |
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Application publication date: 20101027 |