CN207738786U - A kind of system of no coal method production ferrochrome - Google Patents
A kind of system of no coal method production ferrochrome Download PDFInfo
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Abstract
The utility model is related to a kind of systems that no coal method produces ferrochrome.System, which includes that the feedstock pre-processing system, gas-based shaft kiln and combustion gas that set gradually are molten, divides stove, wherein the feedstock pre-processing system includes molding machine；The gas-based shaft kiln includes that furnace body, combustion chamber and top gas utilize system, the furnace body is followed successively by feeding section, reduction section and discharging section from top to bottom, it is provided with the combustion chamber outside the reduction section, the side of the feeding section is exported equipped with top gas, the discharging section is surrounded by several air inlets, the top gas outlet is connected with the top gas using the air inlet of the scrubbing tower of system, and the outlet of the scrubbing tower is connected with the air inlet of the top gas entrance of the combustion chamber and the furnace body；The discharging section of the gas-based shaft kiln is melted with the combustion gas divides the metallized pellet entrance of stove to be connected.The utility model reduces ferrochrome smelting energy consumption, while can produce low-phosphorous, low-sulfur ferrochrome.
Description
Technical field
The utility model is related to ferrochrome technical field more particularly to a kind of systems that no coal method produces ferrochrome.
Background technology
Ferrochrome is the main Cr materials for producing stainless steel, steel alloy, and traditional ferrochrome smelting principle is carbon heat
Reduction method, reducing agent used is solid carbon materials, such as coal, semi-coke, coke powder, the key reaction of generation be：FeO+C=Fe
+CO；3Cr2O3+ 13C=2Cr3C2+9CO；Cr2O3+ 3C=2Cr+3CO.This method reaction temperature is higher, especially chromated oxide
Required reduction reaction temperature is at 1300 DEG C or more, therefore ferrochrome smelting energy consumption is higher.In addition, according to document introduction, ferrochrome
50% or more phosphorus content in product is both from solid carbon reducing agent, therefore, is all difficult to produce phosphorus all the time, sulphur contains
The especially low ferrochrome product of amount causes many steel mills to be needed when smelting while adding expensive crome metal and ferrochrome conjunction
Gold, it is ensured that chromium content is up to standard, and phosphorus content is not exceeded.
There is a kind of method for being directly suitable for the ferrochrome of steel-making from chromite production, is having of will drying
The chromite powder aggregate of carbon dust additive is supplied to the natural gas, anti-under suitable reduction temperature as reducing agent
It answers in container, chromite is restored using the natural gas after reformation.
Natural gas as reducing agent is mainly to contain CO and H2Reforming natural gas, think CO and H2It can restore simultaneously
Ferriferous oxide and chromated oxide, but actually CO and H2It can not but restore chromium with reducing iron oxides under the described conditions
Oxide, therefore the technology can only promote the degree of metalization of iron and cannot improve the degree of metalization of chromium.
And above-mentioned technology still uses the practice of supplying carbon dust, can still bring the impurity such as a certain amount of sulphur, phosphorus into, and due to
Its main reaction mechanism is still carbon thermal reduction, therefore, in order to reduce reaction temperature, is added to basic salt as accelerating agent,
This kind of salt usually has stronger corrosivity, can shorten the service life of equipment.
Also using the method for restoring chromite powder under the mixed gas solid conditions containing natural gas, nitrogen and hydrogen.
Its technological process is formerly to carry out prereduction to chromite powder using mixed gas, and then hot sending enters in mineral hot furnace, by matching
Silica and coke is added to carry out deep reduction, to obtain high-carbon chrome alloy.According to reaction principle, natural gas (CH4) and ferrochrome in
Chromated oxide reaction, can generate hydrogen and carbon monoxide, in mixed gas the presence of hydrogen can inhibit the progress of reaction, it is unfavorable
In the reduction of chromated oxide.Therefore, it is still that deep reduction is carried out to the oxide of chromium by the coke in later stage mineral hot furnace.It adopts
Directly enter stove with fine ore, be easy to cause that solid particle in flue gas is more, reduce the utilization rate of chrome ore, aggravates fume treatment burden.
Therefore, in order to improve the chromium reduction rate of gas reduction chromite, the smelting energy consumption of ferrochrome is reduced, ferrochrome is reduced
The phosphorus content and sulfur content of alloy product improve the quality of ferrochrome, realize and produce ferrochrome without coalification, reduce sulphur row
It puts, realizes the clean manufacturing of ferrochrome, it is necessary to propose a kind of technology of new production ferrochrome.
Utility model content
In view of the above-mentioned problems, the utility model is intended to provide a kind of system and method for no coal method production ferrochrome, with
The chromium reduction rate for improving gas reduction chromite reduces the smelting energy consumption of ferrochrome, reduces the phosphorus content of ferrochrome product
And sulfur content, the quality of ferrochrome is improved, realizes and produces ferrochrome without coalification, sulphur emissions is reduced, realizes ferrochrome
Clean manufacturing.
The utility model provides a kind of system of no coal method production ferrochrome, including the pretreatment of raw material system set gradually
System, gas-based shaft kiln and combustion gas are molten to divide stove, wherein the feedstock pre-processing system includes molding machine；The gas-based shaft kiln includes
Furnace body, combustion chamber and top gas utilize system, and the furnace body is followed successively by feeding section, reduction section and discharging section from top to bottom, described
The combustion chamber is provided with outside reduction section, the side of the feeding section is equipped with top gas and exports, the top gas export with it is described
Top gas is connected using the air inlet of the scrubbing tower of system, the top gas entrance phase of the outlet and the combustion chamber of the scrubbing tower
Even, the discharging section is surrounded by several air inlets；The discharging section of the gas-based shaft kiln and the molten metallization for dividing stove of the combustion gas
Pelletizing entrance is connected.
Above-mentioned system, the feedstock pre-processing system further include proportioner, mixing device and drying unit, it is described at
It is equipped with the proportioner and mixing device being connected before type device, the drying unit, institute are equipped with after the molding machine
The outlet for stating drying unit is connected with the feeding section entrance of the gas-based shaft kiln.
Above-mentioned system, the combustion chamber further include gas inlet, air intake, flue gas outlet and heat exchanger, institute
The flue gas air inlet for stating heat exchanger is connected with the outlet of the flue gas of the combustion chamber.
Above-mentioned system, the heat exchanger further include flue gas gas outlet, cold gas inlet and hot gas outlet, institute
The flue gas gas outlet for stating heat exchanger is connected with the drying gas entrance of the drying unit of the feedstock pre-processing system；The hot day
Right gas outlet is connected with the gas inlet of the air inlet of the furnace body and the combustion chamber respectively.
The utility model improves the chromium reduction rate of gas reduction chromite, reduces the smelting energy consumption of ferrochrome, drop
The low phosphorus content and sulfur content of ferrochrome product, improves the quality of ferrochrome, realizes no coalification production ferrochrome and closes
Gold reduces sulphur emissions, realizes the clean manufacturing of ferrochrome.
Description of the drawings
Fig. 1 is the flowage structure schematic diagram that the utility model produces ferrochrome without coal method.
Specific implementation mode
Below in conjunction with drawings and examples, specific embodiment of the present utility model is described in more details, with
Just the advantages of better understood when the embodiment of the utility model and various aspects.However, specific implementations described below side
Formula and embodiment are for illustrative purposes only, rather than limitations of the present invention.
The system that the utility model produces ferrochrome without coal method, it is main include the feedstock pre-processing system 1 set gradually,
Gas-based shaft kiln 2 and combustion gas, which are melted, divides stove 3.
Wherein, the feedstock pre-processing system, including proportioner 10, mixing device 11, molding machine 12 and drying
Device 13.These certain equipment are not all necessary settings, can increase as the case may be in addition to molding machine 12.The molding
The proportioner 10 being connected and mixing device 11 are equipped with before device 12, being equipped with the drying after the molding machine 12 fills
13 are set, the outlet of the drying unit 13 is connected with 201 entrance of feeding section of the gas-based shaft kiln 2.Fine iron breeze and binder
Through proportioner 10, it is sent into mixing device 11 after dispensing, adds water mixing, obtain mixture, the mixture is sent into molding machine
12 are molded, and obtained fine iron breeze green pellets, fine iron breeze green pellets is re-fed into drying unit 13 and is dried, the baking
Equipment for drying 13 is using gas drying.Used drying gas can be the flue gas that gas-based shaft kiln combustion chamber 21 is discharged, with reality
The UTILIZATION OF VESIDUAL HEAT IN of existing gas-based shaft kiln flue gas.
The gas-based shaft kiln 2, including furnace body 20, combustion chamber 21 and top gas utilize system 22.The furnace body 20 on to
Under be followed successively by feeding section 201, reduction section 202 and discharging section 203.201 side of the feeding section set there are one top gas export, institute
It states top gas outlet with top gas to be connected using the air inlet of the scrubbing tower 221 of system 22, the outlet and combustion of the scrubbing tower 221
The top gas entrance for burning room 21 is connected, and combustion chamber 21 is provided with outside the reduction section 202.The discharging section 203 is surrounded by number
A air inlet, for being passed through the natural gas as also Primordial Qi.The discharging section 203 of the gas-based shaft kiln is melted with the combustion gas divides stove 3
Metallized pellet entrance be connected.
The combustion chamber 21 is located at outside reduction section 202, including gas inlet, air intake, top gas entrance, flue gas
Outlet, heat exchanger 211.
The gas inlet is used to be passed through the natural gas as fuel before starting the reaction, it is made to be put with air burning
Heat, heating furnace body make the reduction section of furnace body reach reaction temperature.After reaction starts, open top gas entrance, make top gas with
Air burning heat release maintains the reaction temperature of gas-based shaft kiln furnace body reduction section.
The heat exchanger 211 include flue gas air inlet, flue gas gas outlet, cold gas inlet, hot gas outlet,
The flue gas air inlet of the heat exchanger is connected with the outlet of the flue gas of the combustion chamber.The flue gas of the heat exchanger 211 goes out
Gas port can be connected with the drying gas entrance of the drying unit 13 of feedstock pre-processing system.The hot gas outlet and furnace body 20
Air inlet is connected with the gas inlet of combustion chamber 21.Furnace body conversion zone is sent into using the natural gas after preheating, is conducive to improve
Heat transfer condition in stove to ensure the temperature of conversion zone, and reduces energy consumption.
The molten gas access for dividing stove 3 of the combustion gas is exported with the top gas of natural gas line and the gas-based shaft kiln 2 respectively
It is connected.
The combustion gas is molten to divide stove 3 that fuelled with natural gas can be used, and the top gas generated after gas-based shaft kiln 2 reacts can also be used
Make fuel with the mixed gas of natural gas.
The system of above-mentioned no coal method production ferrochrome, whole process is using this clean energy resource of natural gas, in production process, day
The effect that right gas is used as reducing agent and combustion gas simultaneously, improves the effective rate of utilization of natural gas.
The method for carrying out producing ferrochrome without coal method using above system, includes the following steps：
Chromite powder, additive, binder, water are pressed into chromite powder:Additive:Binder:Water quality is than 100 parts:10-
25 parts:3-5 parts:It after 6-10 parts of proportioning mixing, is molded, dried, obtain dry chromite powder pelletizing.The chromite
Silica or dolomite can be added in powder ball polymers as additive, the additive is mainly used for adjusting in chromite powder aggregate
Slag system form and improve the reaction rate that gas is reacted with chromite aggregate, the slag system after adjustment in chromite powder aggregate
Composition meets MgO/Al2O3Mass ratio be 1-1.1, (MgO+CaO)/SiO2Mass ratio be 0.8-0.9, with afterflame after guarantee
Gas is molten to divide the slag gold of stove to detach.Binder is used as using one or both of bentonite or starch, for ensureing chromite powder
There is certain intensity after molding.Compression strength is not less than 500N after chromite powder molding, is reacted in gas-based shaft kiln with reducing it
The Dust Capacity generated in the process.
Dry chromite powder pelletizing is sent into gas-based shaft kiln conversion zone, with natural gas (CH4Account for 95% or more) directly into
Promoting the circulation of qi base solid-state synthsis, reaction principle is as shown in formula.
Cr2O3+13/3CH4(g)=2/3Cr3C2+3CO(g)+26/3H2(g),
ΔGθ=837.6-0.988T (kJ/mol), TBegin=850 DEG C
Cr2O3+3CH4(g)=2Cr+3CO (g)+6H2(g)
ΔGθ=818-0.833T (kJ/mol), TBegin=930 DEG C
FeO+4/3CH4(g)=1/3Fe3C+CO(g)+8/3H2(g),
ΔGθ=189.1-0.295T (kJ/mol), TBegin=650 DEG C
FeO+CH4(g)=Fe+CO (g)+2H2(g),
ΔGθ=160.8-0.256T (kJ/mol), TBegin=650 DEG C
The reaction temperature of the gas base solid-state synthsis is 1100 DEG C -1300 DEG C, reaction time about 6-8h.The reaction
Temperature range is less than using the temperature (1300 DEG C or more) needed for carbothermy direct-reduction chromite, greatly reduces energy consumption, phase
Compared with ferrochrome pit coal base prereduction-mineral hot furnace method (energy consumption about 800kgec/t ferrochrome), ferrochrome per ton can reduce energy consumption 30kgec-
40kgec.Meanwhile therefore the temperature range can greatly improve chromite far above the theoretical temperatures needed for reduction reaction
Reduction rate, improve ferrochrome and roll into a ball degree of metalization in the block.Using the degree of metalization of iron in the ferrochrome agglomerate of production method production
Not less than 92%, chromium degree of metalization is not less than 85%.
Generated CO, H after reduction reaction2、CO2、H2The combustion chamber that the top gas of O is sent into gas-based shaft kiln carries out burning confession
Heat provides the heat needed for maintaining reaction temperature, fuel gas CO, H in the mixed gas for gas-based shaft kiln2Volume content
In 85%-95%.
The method of the no coal method production ferrochrome, produces the required amount of natural gas of 1t chromite metallized pellets
250-300Nm3。
The metallized pellet of gained, which is sent into combustion gas and is melted, after reduction divides stove to carry out slag sluicing system at 1550 DEG C -1600 DEG C, obtains
To ferrochrome.Since entire technique is participated in without the solids carbon reducing agent such as coal, the carbon of gained ferrochrome product contains
Amount is less than 4%, and phosphorus content and sulfur content are respectively less than 0.02%, advantageously reduces the decarburization of follow-up stainless steel smelting, dephosphorization and de-
Sulphur analysis.
The utility model can heat the natural gas for being passed through the combustion chamber using the heat exchanger of the combustion chamber.
The utility model can be by the natural gas after the heating of the heat exchanger of the combustion chamber from the air inlet of the gas-based shaft kiln
Mouth is blown into, and so that the natural gas is entered the conversion zone and reduction reaction occurs with the chromite powder pelletizing.
The utility model can be passed through top gas, simultaneously after the reduction reaction of the conversion zone starts to the combustion chamber
The amount of being blown into of natural gas in the combustion chamber is gradually decreased according to furnace temperature situation and top gas production quantity until described in complete use
Top gas burns.
In short, the utility model realizes all natural gas production ferrochrome, without using solids carbons such as any coal or cokes
Reducing agent reduces sulphur emissions, realizes the clean manufacturing of ferrochrome, and it is pure less than 0.02% to have obtained phosphorus, sulfur content
Net ferrochrome product.
The utility model reduces chromite reduction temperature, greatly reduces ferrochrome smelting energy consumption, ton ferrochrome smelting energy consumption
About reduce 30-40kgec.
The utility model improves the reduction rate of chromite, has obtained chromium degree of metalization in 85%-92%, ferrous metal rate
In the metallized pellet of 92%-95%.
Embodiment one
It is passed through natural gas into combustion chamber and air burns, heats gas-based shaft kiln, furnace body conversion zone temperature is made to control
Within the scope of 1100 DEG C.By certain granularity in 200 mesh chromite powder (Cr/Fe=1.42, MgO/Al2O3=1.2) 100 parts, binder
5 parts of (bentonite) and 10 parts of additive (Cab-O-sil) obtains mixture after 6 parts of mixings of mixing device plus water, is sent into pelletizing
Molding obtains the bead that granularity is 3-8mm, is sent into drying device drying.Chromite pelletizing compression strength after drying is 500N,
It is conveyed in the feed hopper on gas-based shaft kiln top, is sent into gas-based shaft kiln from gas-based shaft kiln furnace roof, at the same time, through heat exchanger
Natural gas after heating is blown into from the air inlet of gas-based shaft kiln furnace bottom, is reacted into conversion zone and chromite pelletizing.Reaction
After beginning, the top gas air inlet of combustion chamber is opened, is passed through top gas, CO+H in top gas2Volume content about 85%, while root
According to furnace temperature situation and top gas production quantity, the amount of being blown into of natural gas in combustion chamber is gradually decreased to burning completely using top gas.
After reacting 6h, gas-based shaft kiln furnace bottom discharging section is opened, releases metallized pellet, when discharging, is remained at air inlet and is passed through heat
State natural gas for ensureing that metallized pellet is not oxidized, while reducing in-furnace temperature loss.Natural gas is not restored at this time
Reaction, is discharged by furnace roof through gas outlet, is burnt into combustion chamber.The metallized pellet of gained after analysis reaction, chromium gold
Belong to rate average out to 85%, ferrous metal rate average out to 92%, MgO/Al2O3Mass ratio be 1.1, (MgO+CaO)/SiO2's
Mass ratio is 0.8, used amount of natural gas about 250Nm3.Metallized pellet is finally sent into combustion gas is molten to divide stove, 1550 DEG C-
Slag sluicing system is carried out at a temperature of 1600 DEG C, gained ferrochrome carbon content is less than 4%, chromium content about 53%, phosphorus content, sulfur content
Less than 0.02%, ton ferrochrome energy consumption reduces 40kgec.
Embodiment two
It is passed through natural gas into combustion chamber and air burns, heats gas-based shaft kiln, furnace body conversion zone temperature is made to control
Within the scope of 1200 DEG C.By certain granularity in 200 100 parts of mesh chromite powders (Cr/Fe=2.1, MgO/Al2O3=1.0), binder
3 parts (1 part of 2 parts of bentonite and starch) and 25 parts of additive (10 parts of Cab-O-sil, 15 parts of dolomite dust) add water 10 in mixing device
After part mixing, mixture is obtained, is sent into pelletizing molding, obtains the bead that granularity is 3-8mm, feeding drying device drying.It is dry
Chromite pelletizing compression strength afterwards is 550N, is conveyed in the feed hopper on gas-based shaft kiln top, is sent from gas-based shaft kiln furnace roof
Enter in gas-based shaft kiln, simultaneously, the natural gas after heat exchanger heats is blown into from the air inlet of gas-based shaft kiln furnace bottom, into anti-
It answers section to react with chromite pelletizing, after reaction starts, opens the top gas air inlet of combustion chamber, be passed through top gas, furnace roof
CO+H in gas2Volume content about 95% gradually decrease natural in combustion chamber while according to furnace temperature situation and top gas production quantity
The amount of being blown into of gas using top gas to being burnt completely.After reacting 7h, gas-based shaft kiln furnace bottom discharging section is opened, releases metallization ball
Group when discharging, remains at air inlet and is passed through hot natural gas.For ensureing that metallized pellet is not oxidized, reduce simultaneously
In-furnace temperature loses, and natural gas does not carry out reduction reaction at this time, is discharged by furnace roof through gas outlet, is burnt into combustion chamber.
The metallized pellet of gained after analysis reaction, chromium degree of metalization average out to 88.5%, ferrous metal rate average out to 93.5%,
MgO/Al2O3Mass ratio be 1.0, (MgO+CaO)/SiO2Mass ratio be 0.9, used amount of natural gas about 280Nm3.Finally
Metallized pellet is sent into combustion gas and melted and divides stove, slag sluicing systems, gained ferrochrome carbon content are carried out in 1550 DEG C of -1600 DEG C of temperature
Less than 4%, chromium content about 60%, phosphorus content, sulfur content are less than 0.02%, and ton ferrochrome energy consumption reduces 30kgec.
Embodiment three
It is passed through natural gas into combustion chamber and air burns, heats gas-based shaft kiln, furnace body conversion zone temperature is made to control
Within the scope of 1300 DEG C.By certain granularity in 200 100 parts of mesh chromite powders (Cr/Fe=1.5, MgO/Al2O3=1.1), binder
3 parts (starch) and 15 parts of additive (Cab-O-sil) obtain mixture after mixing device adds 8 parts of mixings of water, be sent into pelletizing at
Type obtains the bead that granularity is 3-8mm, is sent into drying device drying.Chromite pelletizing compression strength after drying is 600N, will
It is transported in the feed hopper on gas-based shaft kiln top, is sent into gas-based shaft kiln from gas-based shaft kiln furnace roof, simultaneously, through heat exchanger plus
Natural gas after heat is blown into from the air inlet of gas-based shaft kiln furnace bottom, is reacted into conversion zone and chromite pelletizing, reaction is opened
After beginning, the top gas air inlet of combustion chamber is opened, is passed through top gas, CO+H in top gas2Volume content about 90%, while root
According to furnace temperature situation and top gas production quantity, the amount of being blown into of natural gas in combustion chamber is gradually decreased to burning completely using top gas.
After reacting 8h, gas-based shaft kiln furnace bottom discharging section is opened, releases metallized pellet, when discharging, is remained at air inlet and is passed through heat
State natural gas for ensureing that metallized pellet is not oxidized, while reducing in-furnace temperature loss.Natural gas is not restored at this time
Reaction, is discharged by furnace roof through gas outlet, is burnt into combustion chamber.The metallized pellet of gained after analysis reaction, chromium gold
Belong to rate average out to 92%, ferrous metal rate average out to 95%, MgO/Al2O3Mass ratio be 1.05, (MgO+CaO)/SiO2's
Mass ratio is 0.85, used amount of natural gas about 300Nm3.Metallized pellet is finally sent into combustion gas is molten to divide stove, 1550 DEG C-
1600 DEG C of temperature carry out slag sluicing system, and gained ferrochrome carbon content is less than 4%, and chromium content about 56%, phosphorus content, sulfur content are small
In 0.02%, ton ferrochrome energy consumption reduces 35kgec.
Traditional coal-based direct reduction-mineral hot furnace depth reducing process carries out chromite at a temperature of 1350-1400 DEG C
Coal-based direct reduction, the degree of metalization of the chromium of the metallized pellet of gained is generally in 30%-80%, after mineral hot furnace deeply reduction,
Carbon content is generally in 6%-8%, and generally all between 0.03%-0.06%, lower step process removing is harmful first for phosphorus content, sulfur content
Plain load weight.
And the entire technique of the utility model is participated in without the solids carbon reducing agent such as coal, therefore gained ferrochrome product
Carbon content is less than 4%, and phosphorus content and sulfur content are respectively less than 0.02%, advantageously reduce decarburization, the dephosphorization of follow-up stainless steel smelting
With desulfurization load.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And it does not limit the embodiments.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.And thus
Among changes and variations that derived from are still in the scope of protection of the utility model.
Claims (4)
1. a kind of system of no coal method production ferrochrome, which is characterized in that including feedstock pre-processing system, the gas set gradually
Base shaft furnace and combustion gas, which are melted, divides stove, wherein
The feedstock pre-processing system includes molding machine；
The gas-based shaft kiln includes that furnace body, combustion chamber and top gas utilize system,
The furnace body is followed successively by feeding section, reduction section and discharging section from top to bottom,
The combustion chamber is provided with outside the reduction section, the side of the feeding section is exported equipped with top gas, the discharging section four
It is equipped with several air inlets week, the top gas outlet is connected with the top gas using the air inlet of the scrubbing tower of system, described
The outlet of scrubbing tower is connected with the air inlet of the top gas entrance of the combustion chamber and the furnace body；
The discharging section of the gas-based shaft kiln is melted with the combustion gas divides the metallized pellet entrance of stove to be connected.
2. system according to claim 1, which is characterized in that the feedstock pre-processing system further includes proportioner, mixes
Expect device and drying unit, the proportioner and mixing device being connected, the molding dress are equipped with before the molding machine
It postpones and is equipped with the drying unit, the outlet of the drying unit is connected with the feeding section entrance of the gas-based shaft kiln.
3. system according to claim 2, which is characterized in that the combustion chamber further include gas inlet, air intake,
Flue gas exports and heat exchanger, and the flue gas air inlet of the heat exchanger is connected with the outlet of the flue gas of the combustion chamber.
4. system according to claim 3, which is characterized in that the heat exchanger further includes that flue gas gas outlet, cold day are right
Gas entrance and hot gas outlet, the flue gas gas outlet of the heat exchanger and the drying unit of the feedstock pre-processing system
Gas entrance is dried to be connected；The hot gas outlet gas inlet with the air inlet of the furnace body and the combustion chamber respectively
It is connected.
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| CN109536703A (en) * | 2018-12-29 | 2019-03-29 | 中冶南方工程技术有限公司 | A kind of ferrochrome smelting device and technique |
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| CN109536703A (en) * | 2018-12-29 | 2019-03-29 | 中冶南方工程技术有限公司 | A kind of ferrochrome smelting device and technique |
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