CN101705336A - Method for producing medium and low carbon ferromanganese through furnace refining - Google Patents
Method for producing medium and low carbon ferromanganese through furnace refining Download PDFInfo
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- CN101705336A CN101705336A CN200910238771A CN200910238771A CN101705336A CN 101705336 A CN101705336 A CN 101705336A CN 200910238771 A CN200910238771 A CN 200910238771A CN 200910238771 A CN200910238771 A CN 200910238771A CN 101705336 A CN101705336 A CN 101705336A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to production of a high-quality manganese ferroalloy product and provides a method for refining high carbon ferromanganese into medium and low carbon ferromanganese through furnace refining. The method comprises the following steps: (1) pouring high carbon and medium carbon ferromanganese to a refining furnace and adding a slag charge and manganese oxide accounting for 20 to 40 mass percent of the slag charge to prepare new slag; (2) blowing pure oxygen into the furnace from the bottom or side, controlling the temperature of a molten pool to less than 1,450 DEG C by adding magnesium oxide or iron oxide, and refining the carbon ferromanganese till the carbon content meets the medium and low carbon standard; (3) adding a refining agent to further refine for deep dephophorization and desulfurization, and adjusting the content of the manganese oxide in the slag to less than 8.0 percent; (4) finally, adding a manganese replenishing agent to carry out manganese replenishment operation, and finishing the refining till the manganese content meets the requirement of low carbon ferromanganese. The method avoids the use of silicon-manganese alloy and greatly reduces the production cost.
Description
Technical field
The production that to the present invention relates to a kind of high-quality manganese be the iron alloy product is the method for medium-low carbon ferromanganese by external refining with the refining of carbon element ferromanganese.
Background technology
The method of traditional production medium-low carbon ferromanganese mainly contains three kinds of electro-silicothermic process, shaking ladle process and blow oxygens.These methods all are to utilize silicomanganese to remove to reduce manganese in the ferromanganese, then carry out desiliconization and handle, to produce medium-low carbon ferromanganese.Because costing an arm and a leg of silicomanganese, the cost that causes these traditional technologys to produce medium-low carbon ferromanganese remains high.In addition, traditional technology has also that facility investment is big, power consumption is high, foreign matter content is high, the bigger shortcoming of pollution that manganese recovery ratio is on the low side, smelting cycle is long, produce.Blow oxygen also can be poured high carbon ferromanganese into oxygen decarburization production medium-low carbon ferromanganese in the converter, but must use the carbon element ferromanganese of manganese content 〉=73%.
Summary of the invention
At the deficiency of traditional production medium-low carbon ferromanganese technology, the invention provides a kind of method of producing medium-low carbon ferromanganese by external refining.
Described method comprises the steps:
(1) high-carbon, mid-carbon fe-mn are poured in the refining furnace, added slag charge and the Mn oxide that contains that accounts for slag charge mass ratio 20%-40% simultaneously, make new slag;
(2) make bottom blowing or side-blown pure oxygen behind the new slag, and control bath temperature and be no more than 1450 ℃, the standard of low-carbon (LC) during refining to carbon content reaches by adding Mn oxide or ferriferous oxide; The pure oxygen amount is decided by decarburized amount, the amount of Mn oxide, ferriferous oxide is comprehensively to be determined by the oxygen-supplying amount and the manganese amount of bringing into, refining is in earlier stage based on the winding-up pure oxygen, with winding-up Mn oxide, ferriferous oxide is auxilliary, and the refining later stage based on winding-up Mn oxide, ferriferous oxide, be auxilliary with the winding-up pure oxygen.
(3) add the further refining of refining agent and carry out dark desulfurization, phosphorus, and manganese oxide content makes it less than 8.0% in the adjustment slag;
(4) add at last manganese-supplementing agent when mending manganese and being operated to manganese content and reaching requiring of low carbon ferromanganese refining finish.
The refining unit that adopts in the above-mentioned steps can be the LF stove that the steel-making refining is used, or large-scale line frequency induction furnace, medium-frequency induction furnace.
Further, in the described step (1), the slag type that adds the slag charge slag charge is CaO-CaF
2, basicity R 〉=2.0, the slag charge add-on is to covering liquid level.
Further, in the described step (1), containing Mn oxide is rich manganese ore or rich manganese slag.
Further, in the described step (2), also comprise: when bath temperature surpasses 1450 ℃, stop the pure oxygen of jetting, spray into Mn oxide or ferriferous oxide and seethe with excitement only temperature is fallen after rise to the step that is no more than 1450 ℃.
Further, in the described step (3), described refining agent calsibar alloy or silico-calcium barium manganese alloy.
Further, in the described step (4), manganese-supplementing agent is low carbon ferromanganese or silicomanganese.
With the traditional method ratio, the present invention has following advantage: avoided the use of silicomanganese, greatly reduced production cost; Adopt oxygen blown mode, comprehensive power consumption is low; Take side-blown (bottom blowing) oxygen mode, and, reduce the volatilization loss of manganese by making new slag; Take oxygen blast and add the oxygen supply mode of Mn oxide collocation, not only better control reaction temperature can also be protected manganese benefit manganese; Later stage adds the refining agent refining, better removes impurity, improves the rate of recovery of manganese. and the present invention has started from carbon element ferromanganese and has taken off C, Si, P by external refining, and S, P are taken off in refining deeply again, protect the production model that Mn carries Mn simultaneously.
Embodiment
Embodiment 1:
The refining furnace that uses is the LF stove, size with about 2.0 tons of each refinings for well.The carbon element ferromanganese of producing in the electric furnace (composition sees Table 1) is poured in the LF stove, added slag charge and rich manganese ore simultaneously, wherein the slag type of slag charge is CaO-CaF
2Basicity R 〉=2.0, the slag charge add-on is advisable to cover liquid level, and rich manganese ore addition accounts for 20% of slag charge mass ratio, power supply heating then and bottom blowing oxygen (oxygen blast intensity can not be broken through liquid level), when flare in the stove when blueness becomes change from weak to strong yellow, reduce oxygen blast intensity, and add Mn oxide with the control bath temperature, make it be no more than 1450 ℃, if surpass 1450 ℃, then stop the pure oxygen of jetting, spray into Mn oxide and seethe with excitement only temperature is fallen after rise to below 1450 ℃.Continuing refining makes carbon content reach the standard of medium-low carbon ferromanganese; After carbon content in the ferromanganese is up to standard, add the refining agent calsibar alloy, strengthen the reduction of manganese and deep dephosphorization, sulphur, and add a certain amount of low carbon ferromanganese and mend the manganese operation, refining finishes when manganese content reaches requiring of low carbon ferromanganese.Last slagging is tapped a blast furnace.The medium-low carbon ferromanganese composition of producing sees Table 1.
Embodiment 2:
The refining furnace that uses is medium-frequency induction furnace, and size is advisable for about 2.0 tons with each refining.The blast furnace carbon element ferromanganese composition that adopts sees Table 2.Blast furnace carbon element ferromanganese is poured in the medium-frequency induction furnace, added the rich manganese slag that slag charge and mass ratio account for carbon element ferromanganese 40% simultaneously, wherein the slag type of slag charge is CaO-CaF
2Basicity R 〉=2.0, the slag charge add-on is advisable to cover liquid level, power supply heating then and bottom blowing oxygen (oxygen blast intensity can not be broken through liquid level), when flare in the stove when blueness becomes change from weak to strong yellow, reduce oxygen blast intensity, and add an amount of ferriferous oxide with the control bath temperature, make it be no more than 1450 ℃, make carbon content reach the standard of medium-low carbon ferromanganese; Then add refining agent silico-calcium barium manganese alloy, the Mn oxide that is not reduced directly reduced, and take off S deeply, P, and adjust MnO content in the slag, make that manganese oxide content is lower than 5% in the slag.Add the manganese-supplementing agent silicomanganese at last and transfer manganese, refining finishes when manganese content reaches requiring of low carbon ferromanganese, slagging, taps a blast furnace, pours into a mould.The low carbon ferromanganese composition of producing sees Table 2.
Ferromanganese composition before and after table 1 embodiment 1 refining (massfraction/%)
Title | ??C | ??Si | ??Mn | ??P | ??S |
Electric furnace ferromanganese | ??7.03 | ??2.34 | ??70.13 | ??0.24 | ??0.03 |
Low carbon ferromanganese after the refining | ??0.43 | ??0.62 | ??83.35 | ??0.11 | ??0.01 |
Ferromanganese composition before and after table 2 embodiment 2 refinings (massfraction/%)
Title | ??C | ??Si | ??Mn | ??P | ??S |
Blast furnace ferromanganese | ??7.02 | ??2.01 | ??68.54 | ??0.21 | ??0.03 |
Title | ??C | ??Si | ??Mn | ??P | ??S |
Low carbon ferromanganese after the refining | ??0.36 | ??0.67 | ??83.51 | ??0.11 | ??0.01 |
Claims (7)
1. method of producing medium-low carbon ferromanganese by external refining is characterized in that described method is as follows:
1.1 high-carbon, mid-carbon fe-mn are poured in the refining furnace, add slag charge and the Mn oxide that contains that accounts for slag charge mass ratio 20%-40% simultaneously, make new slag;
1.2 make bottom blowing or side-blown pure oxygen behind the new slag, and control bath temperature and be no more than 1450 ℃, the standard of low-carbon (LC) during refining to carbon content reaches by spraying into Mn oxide or ferriferous oxide;
Carry out dark desulfurization, phosphorus 1.3 add the further refining of refining agent, and manganese oxide content makes it less than 8.0% in the adjustment slag;
1.4 add at last manganese-supplementing agent when mending manganese and being operated to manganese content and reaching requiring of low carbon ferromanganese refining finish.
2. a kind of method of producing medium-low carbon ferromanganese by external refining according to claim 1 is characterized in that: the refining unit of employing can be the LF stove that the steel-making refining is used, or large-scale line frequency induction furnace, medium-frequency induction furnace.
3. a kind of method of producing medium-low carbon ferromanganese by external refining according to claim 1 is characterized in that: in the described step 1.1, the slag type that adds the slag charge slag charge is CaO-CaF
2, basicity R 〉=2.0, the slag charge add-on is to covering liquid level.
4. a kind of method of producing medium-low carbon ferromanganese by external refining according to claim 1, it is characterized in that: in the described step 1.1, the described Mn oxide that contains is rich manganese ore or rich manganese slag.
5. a kind of method of producing medium-low carbon ferromanganese by external refining according to claim 1, it is characterized in that: in the described step 1.2, also comprise: when bath temperature above 1450 ℃, stop the pure oxygen of jetting, spray into Mn oxide or ferriferous oxide and seethe with excitement only temperature is fallen after rise to the step that is no more than 1450 ℃.
6. a kind of method of producing medium-low carbon ferromanganese by external refining according to claim 1 is characterized in that: in the step 1.3, and described refining agent calsibar alloy or silico-calcium barium manganese alloy.
7. a kind of method of producing medium-low carbon ferromanganese by external refining according to claim 1, it is characterized in that: in the described step 1.4, manganese-supplementing agent is low carbon ferromanganese or silicomanganese.
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103643057A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团研究院有限公司 | Smelting method of medium-carbon ferromanganese |
CN103643056A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团研究院有限公司 | Smelting method of low-carbon ferromanganese |
CN105671247A (en) * | 2016-03-07 | 2016-06-15 | 重庆大学 | External refining method for powder injection dephosphorization for silicon-manganese alloy melt |
CN107311182A (en) * | 2017-06-30 | 2017-11-03 | 昆明理工大学 | A kind of device and method thereof of industrial silicon melt external refining purification |
CN107779550A (en) * | 2017-09-30 | 2018-03-09 | 钢铁研究总院 | A kind of method that molten steel manganeisen addition is reduced in refining process |
CN109055665A (en) * | 2018-08-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of compound dephosphorization method of Mn series alloy |
CN110669944A (en) * | 2019-09-30 | 2020-01-10 | 曾世林 | Method for preparing pure ferromanganese alloy and active silicate particles from inferior alloy powder |
-
2009
- 2009-11-25 CN CN2009102387713A patent/CN101705336B/en not_active Expired - Fee Related
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103643057A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团研究院有限公司 | Smelting method of medium-carbon ferromanganese |
CN103643056A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团研究院有限公司 | Smelting method of low-carbon ferromanganese |
CN103643056B (en) * | 2013-11-27 | 2015-09-16 | 攀钢集团研究院有限公司 | The smelting process of low carbon ferromanganese |
CN105671247A (en) * | 2016-03-07 | 2016-06-15 | 重庆大学 | External refining method for powder injection dephosphorization for silicon-manganese alloy melt |
CN105671247B (en) * | 2016-03-07 | 2017-10-27 | 重庆大学 | A kind of secondary refining method of silicomangan liquid powder dephosphorization |
CN107311182A (en) * | 2017-06-30 | 2017-11-03 | 昆明理工大学 | A kind of device and method thereof of industrial silicon melt external refining purification |
CN107779550A (en) * | 2017-09-30 | 2018-03-09 | 钢铁研究总院 | A kind of method that molten steel manganeisen addition is reduced in refining process |
CN107779550B (en) * | 2017-09-30 | 2019-09-27 | 钢铁研究总院 | The method of molten steel manganeisen additional amount is reduced in a kind of refining process |
CN109055665A (en) * | 2018-08-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of compound dephosphorization method of Mn series alloy |
CN110669944A (en) * | 2019-09-30 | 2020-01-10 | 曾世林 | Method for preparing pure ferromanganese alloy and active silicate particles from inferior alloy powder |
CN110669944B (en) * | 2019-09-30 | 2021-06-15 | 广西星冶科技有限公司 | Method for preparing pure ferromanganese alloy and active silicate particles from inferior alloy powder |
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