CN101705417B

CN101705417B - Method for producing medium and low carbon ferromanganese through furnace refining

Info

Publication number: CN101705417B
Application number: CN2009102387728A
Authority: CN
Inventors: 张建良; 肖清安; 王传琳; 何锋锋
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2009-11-25
Filing date: 2009-11-25
Publication date: 2011-04-20
Anticipated expiration: 2029-11-25
Also published as: CN101705417A

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 is realized by the following steps: (1) after standard carbon ferromanganese is produced in an ore heating furnace, directly discharging slag in the furnace and replacing new slag; (2) refining the standard carbon ferromanganese by adopting a pure oxygen side-blowing or bottom-blowing mode, and injecting magnesium oxide or iron oxide to control the temperature of a molten pool to less than 1,450 DEG C, wherein the amount of pure oxygen is determined by decarbonization amount; the amounts of the magnesium oxide and the iron oxide are comprehensively determined by oxygen supply amount and entrained manganese amount; the pure oxygen blowing is used as the primary and magnesium oxide and iron oxide blowing are used as assistance in refining prophase; and the magnesium oxide and iron oxide blowing is used as the primary and the pure oxygen blowing is used as assistance in the refining anaphase; and (3) when the carbon ferromanganese is refined till the carbon content meets the medium and low carbon standard, adding a refining agent to further refine to strengthen manganese reduction and deep dephophorization and desulfurization till the end, and tapping iron after the slag is discharged.

Description

A kind of method of producing medium-low carbon ferromanganese by furnace refining

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 with the high carbon ferromanganese refining by furnace refining.

Background technology

The method of producing medium-low carbon ferromanganese at present mainly contains three kinds of electro-silicothermic process, shaking ladle process and blow oxygens.Wherein electro-silicothermic process mainly is that manganese ore, silicomanganese and lime etc. add in the electric furnace, relies on electric heating to make the furnace charge fusing, and alloy is carried out the refining desiliconization and makes medium-low carbon ferromanganese, and this is the method for producing medium-low carbon ferromanganese that extensively adopts both at home and abroad at present; Shaking ladle process is that manganese ore, lime and liquid silicon manganese alloy through preheating are added in the shaking ladle, shake then, sensible heat and reaction heat by furnace charge make the furnace charge fusing, carry out again making medium-low carbon ferromanganese after the refining desiliconization, this technology has alleviated follow-up refining desiliconization task greatly, reduce the energy consumption of refining process, relaxed slag manganese content in the refining furnace, improved the rate of recovery of manganese greatly; Blow oxygen is a liquid high carbon ferromanganese to be poured into carry out oxygen blast in the oxygen coverter, makes medium-low carbon ferromanganese to remove carbon in the ferromanganese, silicon, compares with electro-silicothermic process, and blow oxygen has more competitive power economically.But the shortcoming that the method for these several smelting medium-low carbon ferromanganeses commonly used all has the power consumption height, manganese recovery ratio is on the low side, consume a large amount of silicomanganeses.

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 furnace refining.

The present invention mainly realizes in the following manner:

(1) in the hot stove in ore deposit, produce carbon element ferromanganese up to standard after, directly slagging in stove, renew slag;

(2) then adopt the mode of side-blown or bottom blowing pure oxygen to carry out refining, and by spraying into Mn oxide or ferriferous oxide, the control bath temperature is no more than 1450 ℃; 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) after refining is to carbon content to middle low-carbon (LC) standard, the further refining of adding refining agent is strengthened the reduction of manganese and deep dephosphorization, sulphur is extremely finished, and taps a blast furnace after the slagging.

Further, in the above-mentioned steps (1), bleed off the slag about 85%, and to spray into the slag type be CaO-CaF ₂, basicity R 〉=2.0, granularity is the slag charge of 0～2mm, it is equivalent that slag charge adds to cover liquid level.

Further, in the above-mentioned steps (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 above-mentioned steps (3), described refining agent is silico-calcium barium or silico-calcium barium manganese alloy.

The invention provides a kind of production model of new medium-low carbon ferromanganese, started from carbon element ferromanganese and taken off C, Si, P by furnace refining, S, P are taken off in refining deeply again, protect Mn simultaneously and put forward the production model of Mn, compare with the technology of traditional mode of production medium-low carbon ferromanganese, novel process has: flow process is short, production cost is low, comprehensive power consumption is low, grade quality height, the high outstanding advantage of economic benefit.

Embodiment

Embodiment 1:

The carbon element ferromanganese composition of producing in the hot stove in ore deposit up to standard sees Table 1.After producing carbon element ferromanganese up to standard, bleed off the slag about 85%, and to spray into the slag type be CaO-CaF ₂Basicity R 〉=2.0, granularity is the slag charge of 0～2mm, the slag charge add-on is advisable to cover liquid level, the oxygen that then blows side, when flare in the stove when blueness becomes change from weak to strong yellow, add an amount of Mn oxide control bath temperature, carry out the clean boiling of certain hour, be no more than 1450 ℃ to guarantee bath temperature; Observe and analyze the carbon content in the ferromanganese in the refining process, during the low-carbon (LC) standard, add silico-calcium barium in carbon content reaches, strengthen the reduction of manganese and deep dephosphorization, sulphur, last slagging is tapped a blast furnace.The mid-carbon fe-mn composition of producing sees Table 1.

Embodiment 2:

The carbon element ferromanganese composition of producing in the hot stove in ore deposit sees Table 2, and operation steps is identical with last example, and what add when temperature was too high when difference was refining is ferriferous oxide, and refining agent adopts silico-calcium barium manganese alloy, and the mid-carbon fe-mn composition of producing sees Table 2.

Ferromanganese composition before and after table 1 embodiment 1 refining (massfraction/%)

Title	C	Si	Mn	P	S
						Carbon element ferromanganese before the refining	7.32	2.54	71.25	0.38	0.03
Mid-carbon fe-mn after the refining	1.21	0.73	82.00	0.07	0.007

Ferromanganese composition before and after table 2 embodiment 2 refinings (massfraction/%)

Title	C	Si	Mn	P	S
						Carbon element ferromanganese before the refining	7.48	2.51	72.15	0.35	0.03
Mid-carbon fe-mn after the refining	1.25	0.70	84.23	0.07	0.008

Claims

1. method of producing medium-low carbon ferromanganese by furnace refining is characterized in that described method steps is as follows:

1.1 after in the hot stove in ore deposit, producing carbon element ferromanganese up to standard, bleed off 85% slag, and to spray into the slag type be CaO-CaF ₂, basicity R 〉=2.0, granularity is the slag charge less than 2mm, the slag charge add-on is to covering liquid level;

1.2 then adopt the mode of side-blown or bottom blowing pure oxygen to carry out refining, and by spraying into Mn oxide or ferriferous oxide, the control bath temperature is no more than 1450 ℃;

1.3 after refining was to carbon content to middle low-carbon (LC) standard, the further refining of adding refining agent silico-calcium barium or silico-calcium barium manganese alloy was strengthened the reduction of manganese and deep dephosphorization, sulphur is extremely finished, and taps a blast furnace after the slagging.

2. a kind of method of producing medium-low carbon ferromanganese by furnace 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 seethes with excitement only, bath temperature is fallen after rise to the step that is no more than 1450 ℃.