CN1373231A - Method for smelting middle-or low-carbon ferromanganese by frequency-conversion induction furnace - Google Patents
Method for smelting middle-or low-carbon ferromanganese by frequency-conversion induction furnace Download PDFInfo
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- CN1373231A CN1373231A CN 01108113 CN01108113A CN1373231A CN 1373231 A CN1373231 A CN 1373231A CN 01108113 CN01108113 CN 01108113 CN 01108113 A CN01108113 A CN 01108113A CN 1373231 A CN1373231 A CN 1373231A
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Abstract
A process for smelting middle- or low-carbon ferromanganese in frequency-conversion induction furnace includes smelting the carbon ferromanganese to 1250-1600 deg.c in the first furnace, pouring it in the second furnace, top blowing oxygen while bottom blowing the mixture of oxygen and argon at 1250-1750 deg.c, stopping the top blowing oxygen at 1600-1800 deg.c, stopping converting when carbon content is less than 1%, and bottom blowing argon while adding reducer. Its advantage is high utilization rate of Mg.
Description
The present invention relates to a kind of in, production method of low-carbon ferromanganese.
During prior art is produced, production method of low-carbon ferromanganese has electro-silicothermic process, shaking ladle process and converter process etc., electro-silicothermic process is that manganese ore, manganese-silicon and lime are added in the stove, the main electric heating that relies on makes the furnace charge fusing, and manganese silicon is carried out the desiliconization refining and obtains medium-low carbon ferromanganese.Shaking ladle process is to be the iron alloy production method of smelting equipment with the shaking ladle, at first manganese ore, lime and flux is mixed, drop into that liquid manganese-silicon is smelted and in obtaining, low carbon ferromanganese.More than two kinds of methods be cost all to consume manganese-silicon, production cost height, and cause the wasting of resources (consume silicon).Converter process is that the carbon element ferromanganese of liquid state or manganese-silicon are poured in the converter, carries out oxygen blast then, with remove wherein carbon and silicon and in being smelted into, low carbon ferromanganese.Because there is carbon-silicon-manganese reaction localized hyperthermia's district (about 2000 ℃) in converter process, and greater than 1800 ℃ the time, can cause the volatilization of manganese, thus the converter top-blow method smelt in, during low carbon ferromanganese, the recovery rate of manganese is lower, is generally about 70%.This converter does not have heating function, because its volume is big, therefore heat radiation is slow, and therefore this method only is applicable to big volumetrical converter smelting.
The method that the object of the present invention is to provide a kind of frequency-conversion induction furnace that can in the frequency-conversion induction furnace of low capacity, carry out medium-low carbon ferromanganese production to smelt medium-low carbon ferromanganese.
Technical scheme of the present invention is: a kind of frequency-conversion induction furnace is smelted the method for medium-low carbon ferromanganese, comprises the steps:
(1), solid carbon ferromanganese being put into first frequency-conversion induction furnace melts;
(2), when the ferromanganese temperature reaches 1250 ℃～1600 ℃, it is converted in second frequency-conversion induction furnace of bottom blowing argon gas;
(3), in second frequency-conversion induction furnace, with top blow oxygen lance bath is carried out oxygen blast, simultaneously the bottom blowing argon gas is become the bottom oxygen blast, argon-mixed, the ferromanganese in this stove is blown; When the carbon content in the ferromanganese is called early stage of blowing more than or equal to 2% the time, the temperature that control the molten bath this moment is 1250 ℃～1750 ℃, when temperature is too high with slag charge or refrigerant cooling;
(4), the later stage that is called blowing when the carbon content in the ferromanganese less than 2% time, stop top blowing oxygen this moment, only carries out BOTTOM OXYGEN, argon-mixed, and the temperature in control molten bath is 1600 ℃～1800 ℃, the temperature in molten bath is crossed when hanging down, and with second frequency-conversion induction furnace ferromanganese in the molten bath is heated;
(5), when the terminal point for blowing smaller or equal to 1% time of the carbon content in the ferromanganese, after this carry out argon bottom-blowing, and in the molten bath, add reductive agent, the manganese in the slag is reduced in the iron.
The present invention compared with prior art has following advantage:
1, the recovery rate height of manganese.In the low carbon ferromanganese refining, the height key of the recovery rate of manganese depends on bath temperature, temperature is crossed the low a large amount of oxidations that cause manganese easily, the too high a large amount of volatilizations that cause manganese easily of temperature, therefore the present invention controls bath temperature between 1250 ℃～1750 ℃, by on-line continuous temp measuring method to molten iron, can onlinely in real time measure molten iron temperature in the molten bath, the way of carrying out the variable frequency induction heating simultaneously can be regulated the heating power of second frequency-conversion induction furnace arbitrarily, therefore the temperature of molten bath molten iron height is adjustable, thereby can be strict and control bath molten iron temperature second frequency-conversion induction furnace in exactly, guarantee the recovery rate raising of manganese.
2, coordinating tissue produces easily.The equipment that the present invention needs is two frequency-conversion induction furnaces, and one is used to melt solid carbon ferromanganese, and another is used for the refining low carbon ferromanganese, two stove watt levels are adjustable, therefore, can accelerate or reduce smelting speed according to the organization of production situation in the production, organize and coordinate production very easy.
3, the eddy current that produces by frequency-conversion induction furnace can have stirring action to bath to reaching BOTTOM ARGON BLOWING oxygen, can make the mass-and heat-transfer of whole bath effective, the temperature precise control.
Embodiment: a kind of frequency-conversion induction furnace is smelted the method for medium-low carbon ferromanganese, it is characterized in that: comprise the steps:
(1), solid carbon ferromanganese being put into first frequency-conversion induction furnace melts;
(2), when the ferromanganese temperature reaches 1250 ℃～1600 ℃, convert to second frequency-conversion induction furnace when preferably reaching 1370 ℃～1500 ℃;
(3), in second frequency-conversion induction furnace, with top blow oxygen lance bath is carried out oxygen blast, simultaneously the bottom blowing argon gas is become the bottom oxygen blast, argon-mixed, the ferromanganese in this stove is blown; When the carbon content in the ferromanganese is called early stage of blowing more than or equal to 2% the time, the temperature that control the molten bath this moment is 1250 ℃～1750 ℃, preferably 1370 ℃～1650 ℃, when temperature is too high with slag charge or refrigerant cooling;
(4), the later stage that is called blowing when the carbon content in the ferromanganese less than 2% time, stop top blowing oxygen this moment, only carry out BOTTOM OXYGEN, argon-mixed, and the temperature in control molten bath is 1600 ℃～1800 ℃, preferably 1650 ℃～1750 ℃, the temperature in molten bath is crossed when hanging down, and with second frequency-conversion induction furnace ferromanganese in the molten bath is heated;
(5), when the terminal point for blowing smaller or equal to 1% time of the carbon content in the ferromanganese, after this carry out argon bottom-blowing, and in the molten bath, add reductive agent, the manganese in the slag is reduced in the iron.
For example: two of frequency-conversion induction furnaces, the scope of frequency conversion are between the 30HZ to 3000HZ, and liner forms with the electrosmelted magnesite clinker knotting, and MgO content is greater than 96%.Internal diameter is 220 millimeters, and the stove bottom is equipped with circumferential weld sleeve pipe nozzle and molten iron continuous temperature measurement probe.Circumferential weld sleeve pipe oxygen blast gas and argon gas, the outer tube blowing argon gas, the continuous temperature measurement probe is used to detect bath temperature.At any time add refrigerant (for example lime, Wingdale, higher-grade manganese ore, sintered balls, carbon element ferromanganese, useless mid-carbon fe-mn etc.) or the molten bath is heated according to temperature height situation.The interior pipe of the preceding bottom blowing circumferential weld nozzle of hot metal charging and outer tube are together with 2.0NM in second frequency-conversion induction furnace
3When/h flow is blown into argon gas, with 50 kilograms carbon element ferromanganese (Mn76.5%, in C6.9%) melt was packed second frequency-conversion induction furnace into, the temperature after packing into was 1370 ℃, the interior pipe with the bottom blowing nozzle switches to oxygen then, its flow 4NM
3/ h.The flow of outer tube argon gas reduces to 1.7NM
3/ h.The next top water cooled oxygen lance blows then, and top rifle oxygen flow is 10NM
3/ h, pressure are 0.7MPa.The rifle position is 250mm.After lighting a fire successfully, add 1 kilogram of unslaked lime of first slag charge, 2 kilograms of synthetic slags, half kilogram of manganese dustball.Continuous converting 25 minutes.The temperature in reaction molten bath remains at and is lower than 1650 ℃ in the converting process.Therefore add 3.4 kilograms of manganese ores, 2 kilograms of unslaked limes and 0.5 kilogram of fluorite during the course again continuously.Behind 25 minutes top and bottom complex blowings, the top rifle is risen, stop top blowing oxygen, change bottom blowing fully into, bottom blowing gas amount and method are constant, continue blowing 20 minutes, add 2 kilograms of manganese ores, 1 kilogram of unslaked lime and 0.2 kilogram of fluorite in the bottom blowing process again.After the bottom blowing decarburization finished, the interior pipe of bottom blowing nozzle switched to argon gas.The flow of inner and outer pipes all is 1.7NM
3/ h.Continue blowing 5 minutes, add 6 kilograms of reductive agent ferrosilicon, 5 kilograms of unslaked limes, 1 kilogram in fluorite simultaneously continuously.After refining finishes iron and slag are poured in the hot metal ladle together, hung out behind the space for collecting ashes in a stove through pushing off the slag cast after the calmness.Finally obtain 46.8 kilograms of low carbon ferromanganeses (Mn79.2% wherein, C0.76%).The manganese yield is 88.9%.
Claims (4)
1, a kind of frequency-conversion induction furnace is smelted the method for medium-low carbon ferromanganese, it is characterized in that: comprise the steps:
(1), solid carbon ferromanganese being put into first frequency-conversion induction furnace melts;
(2), when the ferromanganese temperature reaches 1250 ℃～1600 ℃, it is converted in second frequency-conversion induction furnace of bottom blowing argon gas;
(3), in second frequency-conversion induction furnace, with top blow oxygen lance bath is carried out oxygen blast, simultaneously the bottom blowing argon gas is become the bottom oxygen blast, argon-mixed, the ferromanganese in this stove is blown; When the carbon content in the ferromanganese is called early stage of blowing more than or equal to 2% the time, the temperature that control the molten bath this moment is 1250 ℃～1750 ℃, when temperature is too high with slag charge or refrigerant cooling;
(4), the later stage that is called blowing when the carbon content in the ferromanganese less than 2% time, stop top blowing oxygen this moment, only carries out BOTTOM OXYGEN, argon-mixed, and the temperature in control molten bath is 1600 ℃～1800 ℃, the temperature in molten bath is crossed when hanging down, and with second frequency-conversion induction furnace ferromanganese in the molten bath is heated;
(5), when the terminal point for blowing smaller or equal to 1% time of the carbon content in the ferromanganese, after this carry out argon bottom-blowing, and in the molten bath, add reductive agent, the manganese in the slag is reduced in the iron.
2, frequency-conversion induction furnace according to claim 1 is smelted the method for medium-low carbon ferromanganese, it is characterized in that: convert to second frequency-conversion induction furnace when the ferromanganese temperature that melts in first frequency-conversion induction furnace reaches 1370 ℃～1500 ℃.
3, frequency-conversion induction furnace according to claim 1 is smelted the method for medium-low carbon ferromanganese, it is characterized in that: in the early stage of second frequency-conversion induction furnace blowing, the temperature in control molten bath is 1370 ℃～1650 ℃.
4, frequency-conversion induction furnace according to claim 1 is smelted the method for medium-low carbon ferromanganese, it is characterized in that: in the mid-term of second frequency-conversion induction furnace blowing, the temperature in control molten bath is 1650 ℃～1750 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01108113 CN1373231A (en) | 2001-03-05 | 2001-03-05 | Method for smelting middle-or low-carbon ferromanganese by frequency-conversion induction furnace |
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| CN 01108113 CN1373231A (en) | 2001-03-05 | 2001-03-05 | Method for smelting middle-or low-carbon ferromanganese by frequency-conversion induction furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705417B (en) * | 2009-11-25 | 2011-04-20 | 北京科技大学 | Method for producing medium and low carbon ferromanganese through furnace refining |
| CN110343938A (en) * | 2019-08-09 | 2019-10-18 | 宁夏亚启科技有限公司 | Utilize the method for variable frequency induction melting furnace remelting alloy powder |
| CN114606431A (en) * | 2022-03-02 | 2022-06-10 | 黄靖元 | Process for producing low-carbon ferromanganese by using induction furnace |
-
2001
- 2001-03-05 CN CN 01108113 patent/CN1373231A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705417B (en) * | 2009-11-25 | 2011-04-20 | 北京科技大学 | Method for producing medium and low carbon ferromanganese through furnace refining |
| CN110343938A (en) * | 2019-08-09 | 2019-10-18 | 宁夏亚启科技有限公司 | Utilize the method for variable frequency induction melting furnace remelting alloy powder |
| CN114606431A (en) * | 2022-03-02 | 2022-06-10 | 黄靖元 | Process for producing low-carbon ferromanganese by using induction furnace |
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