CN104294002A - Method for smelting medium- and low-carbon ferrochromium by introducing one-step method of carbon dioxide converter - Google Patents
Method for smelting medium- and low-carbon ferrochromium by introducing one-step method of carbon dioxide converter Download PDFInfo
- Publication number
- CN104294002A CN104294002A CN201410574974.0A CN201410574974A CN104294002A CN 104294002 A CN104294002 A CN 104294002A CN 201410574974 A CN201410574974 A CN 201410574974A CN 104294002 A CN104294002 A CN 104294002A
- Authority
- CN
- China
- Prior art keywords
- low
- carbon
- carbon ferrochrome
- chrome
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for smelting medium-carbon and low-carbon ferrochromium by introducing a one-step method of a carbon dioxide converter and belongs to the field of metallurgy. The method comprises the following steps: (1) continuously producing high-ferrochromium by using a submerged arc furnace; (2) introducing a CO2 converter to produce medium-carbon and low-carbon ferrochromium; and (3) producing a medium-carbon and low-carbon ferrochromium product. The service life of a fireproof furnace liner is prolonged by introducing the CO2 converter to produce medium-carbon and low-carbon ferrochromium, chromium is prevented from being oxidized during decarburization, the recovery rate of chromium is improved, the grade of converter gas is improved and the smelting cost is lowered.
Description
Technical field
The present invention relates to ferroalloy smelting field, be specifically related to a kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome.
Background technology
At present, the method for smelting middle-low-carbon ferrochrome mainly contains three kinds: cold charge practice, electric furnace-shaking ladle process and blow oxygen.Wherein, cold charge practice chrome ore, silicochrome and lime is added in electric furnace to make load melting, utilizes the Cr in the Si reduction chrome ore in silicochrome
2o
3, increase chromium reaction by desiliconization and produce middle-low-carbon ferrochrome.The method power consumption is high, and loss is serious.Electric furnace-shaking ladle process is that the silicochrome gone out by mine heat furnace smelting carries out desiliconization increasing chromium reaction production middle-low-carbon ferrochrome by shaking ladle, refining furnace, and compared with cold charge practice, energy consumption, ore deposit consume all to have and significantly reduce.But electric furnace-shaking ladle process needs the three part combination operation of silicochromium stove, refining furnace and shaking ladle, and production unit is more, needs many stoves to link in actual production, the more difficult assurance of Harmony, waste amount is large simultaneously, and environmental pollution is serious.Blow oxygen is also referred to as " single stage method ", mine heat furnace smelting high carbon ferro-chrome liquid out is directly blended into converter carry out oxygen blast, utilize the strong oxidizing property of oxygen to be oxidized the element such as carbon, silicon, do not need the production link of silicochrome intermediates, a step obtains middle-low-carbon ferrochrome product.The advantage of the method is: smelting cycle is short, and rhythm of production is compact, without the production link of silicochrome intermediates, its reaction needed for energy for the chemical heat self produced is without the need to additionally providing electric energy; But the reason that this technique is difficult to be promoted is: when China's tradition converter method smelts middle-low-carbon ferrochrome, based on the more high idea being more conducive to decarburization and suppressing chromium oxidation of temperature, high temperature blowing technology is adopted, such as: when producing FeCr55C200, temperature is 1800 DEG C in actual production process; When producing FeCr55C100, temperature is 1900 DEG C; When producing FeCr55C50, temperature is even higher than 2000 DEG C.Too high blowing temperature not only causes lining life short, and refractory consumption rate is large, and the rate of recovery of chromium is also very low, only has about 81%.
In the 1970's, Mannion and Fruehan has set forth employing CO
2as the principle of Fe-C melt decarburizer, its experimental result shows the CO of nearly 1/5
2can be effectively utilised in decarburizing reaction.Heise etc. are by CO
2introduce in AOD refining (argon oxygen mixes stripping carbon) carbon steel process, result shows CO
2add the decarburization efficiency that improve AOD process.Applicant, during doctor's subject study, utilizes CO
2and O
2mixed gas, carries out decarburization to stainless steel melt (Fe-Cr-C system), obtains obvious decarburization and cr yield effect.As from the foregoing, it is feasible for introducing carbonic acid gas decarburization.Further, CO is blown by pure
2o is blown with pure
2contrast known, purely blow CO
2, carbon content drops to about 1%, Cr from 3% and does not almost lose; And purely blow O
2carbon content drops to the loss of 1%, Cr up to 1.5% from 3%.Therefore, CO
2there is the effect that chromium is protected in decarburization simultaneously.
The UHT company of Sweden develops and water vapour is introduced the technique that AOD smelts middle-low-carbon ferrochrome.Due to the lower point heat of desorption of water vapour high temperature, by controlling the ratio that adds of water vapor, the object controlling bath temperature can be reached, this with introduce carbonic acid gas and carry out smelting there is play the same tune on different musical instruments wonderful.
Summary of the invention
The object of the invention is to propose a kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome, solve traditional converter smelting middle-low-carbon ferrochrome Cr and lose high problem.
Introduce the method that carbonic acid gas converter single stage method smelts middle-low-carbon ferrochrome, comprise the steps:
(1) mineral hot furnace continuous seepage high carbon ferro-chrome:
(1.1) preparation of raw material in mineral hot furnace and adding: raw material is allocated into according to the order of coke-silica-chrome ore, the decline along with furnace charge constantly supplements virgin material thus ensures that charge level height is constant;
(1.2) melting: the temperature of described melting is 1650 ~ 1700 DEG C, adopts the electric arc of mineral hot furnace to heat;
(1.3) tap a blast furnace: interval time of tapping a blast furnace is 1.5 ~ 2.5h, slag iron is released from iron mouth simultaneously, and the time length of at every turn tapping a blast furnace is 8 ~ 12min;
(1.4) stifled eye: the ball mud adopting magnesia powder and fireclay to make after tapping a blast furnace blocks up eye;
The described product tapped a blast furnace is high carbon ferro-chrome, and its composition according to weight percent is: Cr:60.2 ~ 72.0%, Si:0.9 ~ 3.5%, C:6.0 ~ 9.5%, P:0.04 ~ 0.06%, S:0.04 ~ 0.06%, and surplus is iron and inevitable impurity;
(2) CO is introduced
2converter producing middle-low-carbon ferrochrome:
(2.1) raw material prepares: high carbon ferro-chrome, slag material and silicochrome that optional step (1) obtains are as raw material;
(2.2) smelt: the liquid high carbon ferro-chrome that step (1) obtains is blended into converter through weighing, and fluid temperature is 1460 ~ 1600 DEG C, converter adopts the mode of top bottom blowing, bottom blowing carbon dioxide and oxygen gas mixture, top blast oxygen; Add slag material after blowing beginning 2 ~ 6min, duration of blast is 30 ~ 90min;
(2.3) tap a blast furnace: when tapping a blast furnace, in hot metal ladle, add silicochrome, add-on is to make Cr in finishing slag
2o
3content is below 27%, and basicity is between 0.3 ~ 0.6; The product tapped a blast furnace described in this step is middle-low-carbon ferrochrome;
(2.4) the liquid middle-low-carbon ferrochrome of granulation or casting step (2.3) gained;
Described middle-low-carbon ferrochrome composition according to weight percent is: Cr:63.0 ~ 75.9%, Si:2.5 ~ 3.0%, C:1.0 ~ 2.9%, P:0.04 ~ 0.06%, S:0.03 ~ 0.05%, and surplus is iron and inevitable impurity;
(3) production of middle-low-carbon ferrochrome finished product:
Adopt the liquid middle-low-carbon ferrochrome of step (2.3) gained as raw material, adopt existing granulation of pig iron method to produce and obtain middle-low-carbon ferrochrome finished product; Or adopt the liquid middle-low-carbon ferrochrome of step (2.3) gained as raw material, adopt existing die casting to produce and obtain middle-low-carbon ferrochrome finished product.
As preferably, described in step (2), slag material is the mixture of chrome ore, lime and magnesia, and its amount of allocating into is: chrome ore: 60 ~ 100kg/t, lime 40 ~ 70kg/t, magnesia 0 ~ 12kg/t, and described t is high carbon ferro-chrome liquid per ton.
As preferably, Cr in the chrome ore in described step (1) and (2)
2o
3be 45.2 ~ 53.5wt%, ∑ FeO is 14.1 ~ 22.6wt%, SiO
2be 3.6 ~ 4.8wt%, Al
2o
3be 10.9 ~ 14.8wt%, MgO be 9.8 ~ 12.9wt%, CaO be 0.11 ~ 0.28wt%, P<0.07wt%, and Cr
2o
3/ ∑ FeO is 2.0 ~ 3.8, this is because work as Cr
2o
3during/∑ FeO>=2.0, can ensure that chrome ore has higher grade, can smelt the ferrochrome product that chromium content is higher, but work as Cr
2o
3after/∑ FeO>3.8, due to Cr in slag
2o
3content raises, and cinder viscosity can be made to increase, and fusing point raises, and causes difficulty, be unfavorable for the carrying out of decarburizing reaction to the effusion of oxygen supply and CO bubble; The granularity of described chrome ore is 10 ~ 70mm.
As preferably, fixed carbon content>=84wt% in the coke in step (1), ash content <15wt%, S<0.6wt%, granularity is 3 ~ 20mm; In described silica, SiO
2>=97wt%, Al
2o
3≤ 1.0wt%, granularity is 20 ~ 80mm.
As preferably, CaO>=85wt%, P≤0.02wt% in lime in step (2), granularity is 10 ~ 50mm; MgO>=96wt%, SiO in magnesia
20.5 ~ 1wt%, CaO1 ~ 1.4wt%.Si >=40wt%, Cr in silicochrome >=30wt%, C0.02 ~ 0.04wt%, P0.02 ~ 0.04wt%, S≤0.01wt%, granularity is 3 ~ 18mm.
As preferably, the converter in step (2) adopts side-blown, top blast, bottom blowing to replace top bottom blowing, and carbon dioxide and oxygen is blown into from the same side.
As preferably, in step (2), the oxygen rifle distance furnace charge liquid level of top blast oxygen is 400 ~ 600mm.
Described granulation of pig iron method is, by means of granulating device, molten iron is condensed into the metallic particles that oxide content is extremely low, chemical property is even, fine and close; Described die casting is that iron liquid is injected the effigurate model of tool, for preventing sticky ingot mould, first leaving standstill for some time during casting, after solution temperature reduces, watering last layer slag ingot casting again.
The mixed gas of what blowing gas of the present invention adopted is carbon dioxide and oxygen, the pressure of mixed gas is suitable with the pressure of blow oxygen injecting oxygen.High pressure mix air-flow from spray orifice flow out after through high-temperature furnace gas with very high velocity shock metal pool.Due to mixed rubbing effect between air-flow and metal pool at a high speed, the momentum of mixed air-flow passes to molten metal, cause the cyclic motion of metal pool, play stirring action, and form the mixed airflow function district of a pit shape in center, molten bath (i.e. mixed air-flow and molten bath impact place).In zone of action, liquid phase mixes, and forms emulsion, this considerably increases the contact area of reactant, and oxygen and carbonic acid gas can react rapidly with the element such as C, Si, Cr, Fe.At high temperature, C, Si major part is oxidized, and Cr, Fe part is oxidized.
The selection of the high carbon ferro-chrome liquid temp that the present invention is used is because the high carbon ferro-chrome liquid being blended into converter requires that temperature is high, to reduce the oxidation of initial stage chromium, the chrome content of molten iron requires higher than 60%, but also should not be too high, the too high meeting of chromium content causes iron liquid viscosity excessive, unfavorable to decarburization.Carbon content in molten iron is lower, to reduce the burden of decarburization in converting process.In molten iron, silicon content is no more than 2%, and in converting process, most of silicon oxidation forms silicon-dioxide, the magnesia furnace lining of high silicon acid slag Eroded that silicon-dioxide causes.Meanwhile, because the sulphur major part in molten iron after blowing enters alloy, qualified for ensureing middle-low-carbon ferrochrome sulfur-bearing, require that sulfur content of hot metal is less than 0.06%.
At carbonic acid gas, needed gas mixing device between oxygen source and oxygen rifle, the flow constituents being intended to make to enter converter molten pool is even, avoids causing and lowers the temperature and the phenomenon that heats up.Carbonic acid gas, between oxygen source and gas mixing device, all need between gas mixing device and oxygen rifle to arrange variable valve, the flow of gas can be controlled in real time.
Effect of the present invention is:
(1) in converter production process, CO is added
2blow, although CO
2a kind of weak oxygenant, but at high temperature, CO
2energy and C carry out reaction and generate CO, therefore CO
2be different from the stirring gas such as Ar, it can participate in stirring, and increases the reaction contact area of the elements such as C, Si in gas and molten metal, can react again, play the effect of decarburization with carbon; In numerous reactions that molten bath occurs, major part reaction is thermopositive reaction, and these reactions make the temperature in molten bath constantly raise, badly damaged furnace lining.And CO
2thermo-negative reaction with the reaction of C, by control CO
2and O
2ratio, can prevent bath temperature too high, extends the work-ing life of refractorily lined; Due to CO
2in bubble, the dividing potential drop of other gases is close to zero, for H
2, N
2deng gas, being equivalent to vacuum, by stirring iron liquid, can H being made
2, N
2cO is diffused into Deng gas
2in bubble, and with CO
2bubble is discharged, and reaches the object of purifying molten iron.In addition, due to a volume CO
2react the CO of generation two volume with C, this can increase melting bath stirring effect, and strengthen decarburization effect, the CO simultaneously generated can increase the ratio of CO in furnace gas, increases its calorific value, can recycle further; CO is blown by pure
2o is blown with pure
2contrast known, purely blow CO
2, carbon content drops to about 1%, Cr from 3% and does not almost lose; And purely blow O
2carbon content drops to the loss of 1%, Cr up to 1.5% from 3%, i.e. CO
2there is the effect that decarburization suppresses chromium to be oxidized simultaneously; Owing to containing CO in blowing gas
2, its cooling effect can reduce the consumption of the refrigerant such as steel scrap, ferrosilicon, can be cost-saving; CO
2byproduct as refrigerant is CO, improves the grade of coal gas of converter;
(2) by Reasonable adjustment mineral hot furnace continuous seepage high carbon ferro-chrome technique, the high carbon ferro-chrome produced is made more to meet CO
2bessemerize the production requirement of middle-low-carbon ferrochrome, and this process cost is reduced;
(3) by each processing parameter of Reasonable adjustment converter smelting, it is made more to be applicable to CO
2blowing produce.
Embodiment
Introduce carbonic acid gas converter single stage method and smelt middle-low-carbon ferrochrome, it comprises the steps: high carbon ferro-chrome liquid to be blended in converter, shake positive body of heater, and in converter, pass into source of the gas with oxygen rifle or gas permeable brick, source of the gas is the mixed gas of oxygen and carbonic acid gas, gas is jetted after mixing tank mixes, and the ratio of the two determined by iron alloy composition and blowing temperature.When blowing starts, molten iron temperature is lower, and the element such as silicon, chromium is first oxidized, forms SiO
2the natural slag that content is higher, thus blow about 4min time to add slag material in order to protect furnace lining creating conditions for later stage reduction-oxidation chromium.Along with the rising of melt temperature, O
2and CO
2all participate in decarburizing reaction, due to CO
2diluting effect, the dividing potential drop of CO is reduced, promote C and O
2, C and CO
2the carrying out of reaction, makes the concentration of carbon in ferrochrome liquid reduce.Before tapping a blast furnace, in stove, add silicochrome, reduce Cr in slag
2o
3content and basicity of slag, increase the mobility of slag.Finally, carry out terminal point control, wait to judge that the qualified i.e. blow off of carbon content taps a blast furnace.Main chemical reactions of the present invention is as follows:
| No | Chemical reaction | ? |
| (1) | [C]+1/2O 2(g)＝CO(g) | ΔG θ＝-138905-41.63T |
| (2) | [C]+CO 2(g)＝2CO(g) | ΔG θ＝140170-125.6T |
| (3) | [C]+[O]＝CO(g) | ΔG θ＝-21755-38.74T |
| (4) | 2[Cr]+3/2O 2(g)＝Cr 2O 3(s) | ΔG θ＝-1170480+350.41T |
| (5) | 2[Cr]+3CO 2(g)＝Cr 2O 3(s)+3CO(g) | ΔG θ＝-321505+97.47T |
Known by upper table, same to O
2compare, CO
2be weak oxidant, it can react with C and generate CO at converter smelting temperature, and it is weaker than O to the oxidation capacity of Cr
2to the oxidation capacity of Cr.
5 reactions in contrast in table are known, reaction (2) is thermo-negative reaction, reaction (1), (3), (4), (5) are thermopositive reaction, and this just provides theoretical basis, by control CO for controlling bath temperature
2add-on controls the temperature in molten bath, and plays protection furnace lining, extends the effect of life of converter.
Introduce CO
2after, it is continuous and gentleness to the temperature control of converter melt, and cooling performance is better than adding the refrigerant such as steel scrap or middle-low-carbon ferrochrome, does not need to experience melting period, can reduce slag splash.In addition, CO
2not only can not increase the foreign matter content in aluminium alloy, can also by being mingled with, gas takes out of and puies forward heavy alloyed quality further.
The present invention is by introducing CO
2smelt the dividing potential drop that middle-low-carbon ferrochrome can reduce CO in smelting process, reduce the carbon content in aluminium alloy.By control CO
2the amount of being blown into, can play control bath temperature, and protection furnace lining, extends life of converter, the effect saved production cost.
Embodiment 1
Introduce the method that carbonic acid gas converter single stage method smelts middle-low-carbon ferrochrome, comprise the steps:
(1) mineral hot furnace continuous seepage high carbon ferro-chrome:
(1.1) preparation of raw material in mineral hot furnace and adding: raw material is allocated into according to the order of coke-silica-chrome ore, the decline along with furnace charge constantly supplements virgin material thus ensures that charge level height is constant;
(1.2) melting: the temperature of described melting is 1670 DEG C, adopts the electric arc of mineral hot furnace to heat;
(1.3) tap a blast furnace: interval time of tapping a blast furnace is 2.0h, slag iron is released from iron mouth simultaneously, and the time length of at every turn tapping a blast furnace is 8min;
(1.4) stifled eye: the ball mud adopting magnesia powder and fireclay to make after tapping a blast furnace blocks up eye;
The described product tapped a blast furnace is high carbon ferro-chrome, and its composition according to weight percent is: Cr:68.0%, Si:2.0%, C:8.0%, P:0.04%, S:0.05%, and surplus is iron and inevitable impurity;
(2) CO is introduced
2converter producing middle-low-carbon ferrochrome:
(2.1) raw material prepares: select high carbon ferro-chrome that slag material and silicochrome and step (1) obtain as raw material;
(2.2) smelt: the liquid high carbon ferro-chrome that step (1) obtains is blended into converter through weighing, shakes positive body of heater, heat size ratio (V/t) is selected between 0.7 ~ 0.8.In converter, bonded hard ferrite magnet is 1520 DEG C, and converter adopts the mode of top bottom blowing, bottom blowing carbon dioxide and oxygen gas mixture, top blast oxygen; Blowing adds slag material after starting 4min, and duration of blast is 60min;
(2.3) tap a blast furnace: when tapping a blast furnace, in hot metal ladle, add silicochrome, add-on is to make Cr in finishing slag
2o
3content about 26%, basicity about 0.46; The product tapped a blast furnace described in this step is middle-low-carbon ferrochrome;
(2.4) middle-low-carbon ferrochrome of granulation step (2.3) gained;
Described middle-low-carbon ferrochrome composition according to weight percent is: Cr:70.2%, Si:2.6%, C:1.5%, P:0.05%, S:0.04%, and surplus is iron and inevitable impurity;
(3) production of middle-low-carbon ferrochrome finished product:
Adopt the middle-low-carbon ferrochrome of step (2.4) granulation gained as raw material, adopt existing granulation of pig iron method to produce and obtain middle-low-carbon ferrochrome finished product.
Described in step (2), slag material is the mixture of chrome ore, lime and magnesia, and its amount of allocating into is: chrome ore: 60 ~ 100kg/t, lime 40 ~ 70kg/t, magnesia 0 ~ 12kg/t, and described t is high carbon ferro-chrome liquid per ton.
Cr in chrome ore in described step (1) and (2)
2o
3for 51.9wt%, ∑ FeO is 15.4wt%, SiO
2for 4.2wt%, Al
2o
3be 0.06wt% for 13.1wt%, MgO be 11.2wt%, CaO are 0.19wt%, P, and Cr
2o
3/ ∑ FeO is 3.4; The mean particle size of described chrome ore is 48mm.
Fixed carbon content>=88wt% in coke in step (1), ash content <10wt%, S<0.5wt%, mean particle size is 16mm; In described silica, SiO
2>=98wt%, Al
2o
3≤ 0.8wt%, granularity is 66mm.
CaO>=88wt%, P≤0.008wt% in lime in step (2), granularity is 42mm; MgO>=98wt%, SiO in magnesia
20.9wt%, CaO1.2wt%.Si >=48wt%, Cr in silicochrome >=39wt%, C0.03wt%, P0.03wt%, S≤0.008wt%, granularity is 10mm.
In step (2), the oxygen rifle distance furnace charge liquid level of top blast oxygen is 510mm.
Experimental result shows, CO
2effectively can reduce the temperature in molten bath, CO
2when carbon content is higher, decarburization effect is better than O
2, adopt CO
2-O
2mix and blow the rate of recovery that can improve chromium.
Claims (8)
1. introduce the method that carbonic acid gas converter single stage method smelts middle-low-carbon ferrochrome, it is characterized in that, comprise the steps:
(1) mineral hot furnace continuous seepage high carbon ferro-chrome:
(1.1) preparation of raw material in mineral hot furnace and adding: raw material is allocated into according to the order of coke-silica-chrome ore, the decline along with furnace charge constantly supplements virgin material thus ensures that charge level height is constant;
(1.2) melting: the temperature of described melting is 1650 ~ 1700 DEG C, adopts the electric arc of mineral hot furnace to heat;
(1.3) tap a blast furnace: interval time of tapping a blast furnace is 1.5 ~ 2.5h, slag iron is released from iron mouth simultaneously, and the time length of at every turn tapping a blast furnace is 8 ~ 12min;
(1.4) stifled eye: the ball mud adopting coke powder and fireclay to make after tapping a blast furnace blocks up eye;
The described product tapped a blast furnace is high carbon ferro-chrome, and its composition according to weight percent is: Cr:60.2 ~ 72.0%, Si:0.9 ~ 3.5%, C:6.0 ~ 9.5%, P:0.04 ~ 0.06%, S:0.04 ~ 0.06%, and surplus is iron and inevitable impurity;
(2) CO is introduced
2converter producing middle-low-carbon ferrochrome:
(2.1) raw material prepares: select high carbon ferro-chrome that slag material and silicochrome and step (1) obtain as raw material;
(2.2) smelt: the liquid high carbon ferro-chrome that step (1) obtains is blended into converter through weighing, and being blended into temperature is 1460 ~ 1600 DEG C, converter adopts the mode of top bottom blowing, bottom blowing carbon dioxide and oxygen gas mixture, top blast oxygen; Add slag material after blowing beginning 2 ~ 6min, duration of blast is 30 ~ 90min;
(2.3) tap a blast furnace: when tapping a blast furnace, in hot metal ladle, add silicochrome, add-on is to make Cr in finishing slag
2o
3content is below 27%, and basicity is between 0.3 ~ 0.6; The product tapped a blast furnace described in this step is middle-low-carbon ferrochrome;
(2.4) the liquid middle-low-carbon ferrochrome of granulation or casting step (2.3) gained;
Described middle-low-carbon ferrochrome composition according to weight percent is: Cr:63.0 ~ 75.9%, Si:2.5 ~ 3.0%, C:1.0 ~ 2.9%, P:0.04 ~ 0.06%, S:0.03 ~ 0.05%, and surplus is iron and inevitable impurity;
(3) production of middle-low-carbon ferrochrome finished product:
Adopt the liquid middle-low-carbon ferrochrome of step (2.3) gained as raw material, adopt existing granulation of pig iron method to produce and obtain middle-low-carbon ferrochrome finished product; Or adopt the liquid middle-low-carbon ferrochrome of step (2.3) gained as raw material, adopt existing die casting to produce and obtain middle-low-carbon ferrochrome finished product.
2. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, slag material described in step (2) is the mixture of chrome ore, lime and magnesia, its amount of allocating into is: chrome ore: 60 ~ 100kg/t, lime 40 ~ 70kg/t, magnesia 0 ~ 12kg/t, described t are high carbon ferro-chrome liquid per ton.
3. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, Cr in the chrome ore in described step (1) and (2)
2o
3be 45.2 ~ 53.5wt%, ∑ FeO is 14.1 ~ 22.6wt%, SiO
2be 3.6 ~ 4.8wt%, Al
2o
3be 10.9 ~ 14.8wt%, MgO be 9.8 ~ 12.9wt%, CaO be 0.11 ~ 0.28wt%, P<0.07wt%, and Cr
2o
3/ ∑ FeO is 2.0 ~ 3.8; The granularity of described chrome ore is 10 ~ 70mm.
4. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, fixed carbon content>=84wt% in coke in step (1), ash content <15wt%, S<0.6wt%, granularity is 3 ~ 20mm; In described silica, SiO
2>=97wt%, Al
2o
3≤ 1.0wt%, granularity is 20 ~ 80mm.
5. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, CaO >=85wt%, P≤0.02wt% in lime in step (2), and granularity is 10 ~ 50mm; MgO >=96wt%, SiO20.5 in magnesia ~ 1wt%, CaO1 ~ 1.4wt%; Si >=40wt%, Cr in silicochrome >=30wt%, C0.02 ~ 0.04wt%, P0.02 ~ 0.04wt%, S≤0.01wt%, granularity is 3 ~ 18mm.
6. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, converter in step (2) adopts side-blown, top blast, bottom blowing to replace top bottom blowing, and carbon dioxide and oxygen is blown into from the same side.
7. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, in step (2), the oxygen rifle distance furnace charge liquid level of top blast oxygen is 400 ~ 600mm.
8. introducing carbonic acid gas converter single stage method according to claim 1 smelts the method for middle-low-carbon ferrochrome, it is characterized in that, described granulation of pig iron method is, by means of granulating device, molten iron is condensed into the metallic particles that oxide content is extremely low, chemical property is even, fine and close; Described die casting is that iron liquid is injected the effigurate model of tool, for preventing sticky ingot mould, first need leave standstill for some time during casting, after solution temperature reduces, watering last layer slag ingot casting again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410574974.0A CN104294002B (en) | 2014-10-23 | 2014-10-23 | A kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410574974.0A CN104294002B (en) | 2014-10-23 | 2014-10-23 | A kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104294002A true CN104294002A (en) | 2015-01-21 |
| CN104294002B CN104294002B (en) | 2016-04-13 |
Family
ID=52313948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410574974.0A Active CN104294002B (en) | 2014-10-23 | 2014-10-23 | A kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104294002B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087995A (en) * | 2015-09-22 | 2015-11-25 | 刘来宝 | Method for producing silicochrome through cut waste one-step method in photovoltaic industry |
| CN106167845A (en) * | 2016-09-27 | 2016-11-30 | 东北大学 | A kind of winding-up CO2or the method for carbon in limestone removing vanadium-bearing hot metal |
| CN106319154A (en) * | 2016-09-27 | 2017-01-11 | 东北大学 | Method for drawing in limestone in vortex manner to remove carbon in copper-containing molten iron |
| CN106591686A (en) * | 2017-01-19 | 2017-04-26 | 西峡县中嘉合金材料有限公司 | Production technology of high-purity micro-carbon ferrochromium |
| CN106756380A (en) * | 2016-11-28 | 2017-05-31 | 江苏大学 | A kind of rotary hearth furnace makes the method that high carbon ferro-chrome solid state decarbonization produces low-carbon ferrochromium |
| CN107385213A (en) * | 2017-07-03 | 2017-11-24 | 江苏省冶金设计院有限公司 | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
| CN111850240A (en) * | 2020-07-14 | 2020-10-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for smelting austenitic stainless steel by blowing carbon dioxide into AOD converter |
| CN113549741A (en) * | 2021-07-31 | 2021-10-26 | 江苏鼎跃金属制品有限公司 | Method for preparing low-carbon ferrochrome by vacuum oxidizing gas decarburization |
| CN114574641A (en) * | 2022-03-02 | 2022-06-03 | 北京科技大学 | Method for smelting medium-low carbon ferromanganese |
| CN115323097A (en) * | 2022-05-12 | 2022-11-11 | 北京科技大学 | Method for increasing dissolution amount of chromium in molten slag in chromium ore smelting reduction process |
| CN115747401A (en) * | 2022-11-16 | 2023-03-07 | 中冶东方工程技术有限公司 | Combined production method of high-carbon ferrochrome and medium-low carbon ferrochrome |
| CN115821070A (en) * | 2022-12-06 | 2023-03-21 | 中国科学院过程工程研究所 | Method for extracting vanadium by oxidizing molten iron |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053093A (en) * | 1990-01-06 | 1991-07-17 | 浙江横山铁合金厂 | The production method of low-phosphorous, the humble carbon ferrochrome of high chromium |
| CN1924056A (en) * | 2005-08-30 | 2007-03-07 | 刘沈杰 | Technology of one-step smelting medium carbon ferrochrome from chromite utilizing mine smelting furnace |
| CN101538629A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Process and device for smelting chromium irons and chromium-containing molten iron by using chromium ore powder |
| CN102140567A (en) * | 2010-01-29 | 2011-08-03 | 长春工业大学 | Argon-oxygen refining method for low-carbon ferrochromium alloy |
-
2014
- 2014-10-23 CN CN201410574974.0A patent/CN104294002B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053093A (en) * | 1990-01-06 | 1991-07-17 | 浙江横山铁合金厂 | The production method of low-phosphorous, the humble carbon ferrochrome of high chromium |
| CN1924056A (en) * | 2005-08-30 | 2007-03-07 | 刘沈杰 | Technology of one-step smelting medium carbon ferrochrome from chromite utilizing mine smelting furnace |
| CN101538629A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Process and device for smelting chromium irons and chromium-containing molten iron by using chromium ore powder |
| CN102140567A (en) * | 2010-01-29 | 2011-08-03 | 长春工业大学 | Argon-oxygen refining method for low-carbon ferrochromium alloy |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087995A (en) * | 2015-09-22 | 2015-11-25 | 刘来宝 | Method for producing silicochrome through cut waste one-step method in photovoltaic industry |
| CN106167845A (en) * | 2016-09-27 | 2016-11-30 | 东北大学 | A kind of winding-up CO2or the method for carbon in limestone removing vanadium-bearing hot metal |
| CN106319154A (en) * | 2016-09-27 | 2017-01-11 | 东北大学 | Method for drawing in limestone in vortex manner to remove carbon in copper-containing molten iron |
| CN106167845B (en) * | 2016-09-27 | 2019-02-05 | 东北大学 | A kind of blowing CO2Or the method that lime stone removes carbon in vanadium-bearing hot metal |
| CN106756380B (en) * | 2016-11-28 | 2018-12-14 | 江苏大学 | A method of so that high carbon ferro-chrome solid state decarbonization is produced low-carbon ferrochromium with rotary hearth furnace |
| CN106756380A (en) * | 2016-11-28 | 2017-05-31 | 江苏大学 | A kind of rotary hearth furnace makes the method that high carbon ferro-chrome solid state decarbonization produces low-carbon ferrochromium |
| CN106591686A (en) * | 2017-01-19 | 2017-04-26 | 西峡县中嘉合金材料有限公司 | Production technology of high-purity micro-carbon ferrochromium |
| CN107385213A (en) * | 2017-07-03 | 2017-11-24 | 江苏省冶金设计院有限公司 | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
| CN111850240A (en) * | 2020-07-14 | 2020-10-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for smelting austenitic stainless steel by blowing carbon dioxide into AOD converter |
| CN113549741A (en) * | 2021-07-31 | 2021-10-26 | 江苏鼎跃金属制品有限公司 | Method for preparing low-carbon ferrochrome by vacuum oxidizing gas decarburization |
| CN114574641A (en) * | 2022-03-02 | 2022-06-03 | 北京科技大学 | Method for smelting medium-low carbon ferromanganese |
| CN115323097A (en) * | 2022-05-12 | 2022-11-11 | 北京科技大学 | Method for increasing dissolution amount of chromium in molten slag in chromium ore smelting reduction process |
| CN115747401A (en) * | 2022-11-16 | 2023-03-07 | 中冶东方工程技术有限公司 | Combined production method of high-carbon ferrochrome and medium-low carbon ferrochrome |
| CN115747401B (en) * | 2022-11-16 | 2024-01-23 | 中冶东方工程技术有限公司 | Combined production method of high-carbon ferrochrome, medium-carbon ferrochrome and low-carbon ferrochrome |
| CN115821070A (en) * | 2022-12-06 | 2023-03-21 | 中国科学院过程工程研究所 | Method for extracting vanadium by oxidizing molten iron |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104294002B (en) | 2016-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104294002B (en) | A kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome | |
| EP2380995B1 (en) | Smelting vessel, steel making plant and steel production method | |
| CN101696462B (en) | Method for producing low phosphorus steel by smelting semisteel | |
| CN101117651B (en) | Converting process for converter low-silicon molten iron | |
| CN102424886B (en) | Furnace protection process for decarburization converter less slag splashing | |
| CN108148942B (en) | A kind of converter slag stays slag gasification dephosphorization method and recycles smelting process | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN101294233B (en) | Desilication demanganization method at same time of preprocessing hot metal | |
| CN106282487B (en) | A kind of pre-dephosporizing method for molten iron | |
| CN103789483B (en) | Method for smelting low-phosphorus steel by using semi-steel | |
| CN102242239A (en) | Molten iron pre-dephosphorization method by utilizing top and bottom combined blown converter | |
| CN109097522B (en) | Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point | |
| JP2015218338A (en) | Molten iron refining method by converter type refining furnace | |
| CN104164531A (en) | Method for producing cast iron by adopting converter blowing smelting and purification | |
| CN201351168Y (en) | Iron-contained material continuous steelmaking device | |
| CN102766723A (en) | Limestone slagging steelmaking lance position control method for basic oxygen furnaces | |
| CN104164529A (en) | Method for producing cast iron by adopting remelting furnace blowing smelting and purification, and apparatus thereof | |
| CN107365886B (en) | A kind of method of converter high temperature dephosphorization | |
| CN102465239B (en) | Method for increasing sulfur yield of high sulfur stainless steel | |
| CN103725821B (en) | A kind of method improved containing vanadium titanium semi-steel making converter lining life | |
| CN104164530A (en) | Method for producing cast iron by adopting electric furnace blowing smelting and purification | |
| CN102634634B (en) | Method for producing high-alloy low-phosphorous steel used for boiler tube by adopting electric-arc furnace | |
| CN100447271C (en) | Method for smelting carbon dioxide corrosion resistant steel | |
| CN104531948B (en) | Method of dephosphorization of molten iron | |
| CN103540712B (en) | Nitrogen increasing method of low-carbon high-nitrogen stainless steel ladle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |