CN207596923U - A kind of system for producing silicochromium - Google Patents
A kind of system for producing silicochromium Download PDFInfo
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- CN207596923U CN207596923U CN201720992679.6U CN201720992679U CN207596923U CN 207596923 U CN207596923 U CN 207596923U CN 201720992679 U CN201720992679 U CN 201720992679U CN 207596923 U CN207596923 U CN 207596923U
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Abstract
The utility model discloses a kind of system for producing silicochromium, including：Mixing device, ball-making device, green-ball screening plant, drying unit, rotary hearth furnace device, feeding device and furnace device.The utility model directly produces silicochromium using chromogen miberal powder, reduce the operating technology difficulty of silicochromium smelting, compared with traditional silicochromium two step method (high carbon ferro-chrome silicochromium), the power consumption 1%~7% that ton silicochromium is smelted is reduced, improves the chromium metal recovery 3%~5% of silicochromium smelting.
Description
Technical field
The utility model is related to ferroalloy field more particularly to a kind of systems for producing silicon chromium.
Background technology
Silicochromium be electro silicothermic process production in, the indispensable reducing agent of low ＆ micro carbon ferrochromium.Produce the side of silicochromium
There are two types of methods：One-step method (slagprocess) and two step method (slagless process).One-step method is that chrome ore, silica and coke are directly added into one
It is smelted in electric furnace.The first step of two step method is to add in chrome ore and coke in First electric furnace, smelts high carbon ferro-chrome, the
Two steps will add in second electric furnace together with high carbon chromium iron block and silica, coke and carry out smelting silicochromium.At present, China is in work
Mainly using two step method in industry production, one-step method then only carries out overtesting in a small number of factories.This be primarily due to compared to
One-step method, the operating technology of two step method is simple, is easily mastered, and ton product power consumption is relatively low (about 7200kWh), but this method process
More, high carbon ferro-chrome is lost greatly after broken, transport, storage, and the rate of recovery for causing chromium metal is low (about 87%), deficiency in economic performance.
The characteristics of one-step method is that technological process is short, and the rate of recovery of metal is high, good in economic efficiency.Therefore it is closed in some iron of Sweden, Germany
Golden enterprise uses One-step production silicochromium, but it must be lump ore or pellet that it, which is required into stove chrome ore, to chrome ore and silicon
Stone, the requirement of coke equigranular are stringent.The chrome ore in China is mainly derived from import, and fine ore accounts for more than 70% in import chrome ore, block
Ore deposit only accounts for 30% or so, and the lump ore of not all granularity is all suitable for, and is limited by material condition, and China is caused always can not
Realize the one-step method industrialized production of silicochromium.
Utility model content
The technical problem to be solved by the utility model is to propose a kind of method and system for producing silicochromium, use
Smelting operation technical difficulty and power consumption are reduced while chromium powder ore one-step method smelts silicochromium and increases chromium metal recovery rate, is carried
High economic benefit.
Thus the utility model discloses a kind of method for producing silicochromium, include the following steps：
S1, chromogen miberal powder, reducing agent powder, addition binding agent and water are subjected to mixing, obtain mixture；
S2 and then pressure ball or pelletizing processing are carried out to mixture makes the mixture be molded to obtain molding pelletizing；
S3, the molding pelletizing is dried to obtain dry pelletizing；
S4, the dry pelletizing progress reduction roasting is obtained into agglomerates；
S5, the agglomerates and silica, coke are added in the deep reduction of progress in electric furnace together, obtains silicochromium.
Further, the granularity of each powder is less than 1mm in the mixture, when being molded using pelletizing mode, it is desirable that
Wherein granularity accounts for more than 85% less than 0.074mm, when using pressure ball mode balling-up, then wherein granularity is required to be accounted for less than 1mm
More than 95%.
Further, the molding pelletizing grain size is 8~30mm, and grain size is too small, and furnace charge air permeability is poor, is unfavorable for electric furnace
Production, grain size is excessive, and reduction roasting difficulty is big, is susceptible to the halfway situation of reduction.
Further, the mass values of the chromogen miberal powder requirement chromium content and iron content are not less than 1.30, preferably model
It is 1.5~2.0 to enclose, content of MgO and Al2O3The mass values of content are not less than 1, and preferred scope is 1.2~1.8.
The mode with ore deposit can be used and obtain satisfactory chromogen miberal powder.Thereby guarantee that the chromium of gained silicochromium product contains
It measures up to standard, while advantageously reduces slag melting, ensure that slag fluidity is good during electric furnace smelting, easily slags tap, reduce operation skill
Art difficulty.
Further, dolomite dust is further included in the mixture, the dolomite dust weight accounts for chromogen miberal powder weight
0%~20%, dolomite is non-essential, and its object is to improve content of MgO and Al in mixture2O3The ratio of content, subtracts
Few content of MgO and Al2O3The usage amount of the high and expensive chromogen miberal powder of the ratio of content, in addition, dolomite is in the reduction roasting stage
It can decompose, generate CO2Gas increases the porosity of pelletizing, is conducive to the degree of metalization of pelletizing after increase reduction roasting, can
To improve comprehensive degree of metalization 2%~9%.
Further, the reducing agent powder be carbonaceous reducing agent, the mole of total fixed carbon of the reducing agent powder
1.3-1.6 times for the mole of oxygen in ferriferous oxide in the chromogen miberal powder and chromated oxide.
The reduction of the very few unfavorable chromium of fixed carbon and iron, and appropriate residual carbon advantageously forms the carbide of chromium and iron, such as
Fe3C and Cr7C3, this two kinds of substances can react generation CrSi or FeSi with restoring Si during follow-up electric furnace smelting, so as to promote
Carbon is to SiO during into electric furnace smelting2Reduction, shown in the reaction occurred such as formula (1) and formula (2)；Cross at most pellet strength
It can be deteriorated, and scaling loss can also increase, reduction effect is deteriorated, and is also unfavorable for reducing cost.
Cr7C3+ 7Si=7CrSi+3C (1)
Fe3C+3Si=3FeSi+3C (2)
Further, the binding agent is bentonite or the mixture of bentonite and starch, and the binding agent adds
Dosage is the 3%~8% of the chromogen miberal powder weight, the additive amount of the binding agent for the chromogen miberal powder weight 3%~
8%；And/or
The additive amount of coke described in step S5 is the 40%~60% of the chromogen miberal powder weight,
The additive amount of the silica is the 80%~120% of the chromogen miberal powder weight.
Further, the drying temperature is 100-150 DEG C, and the reduction roasting temperature of the reducing roasting process exists
1400 DEG C~1550 DEG C, preferred scope is 1450 DEG C~1500 DEG C, and temperature is too low, is unfavorable for the reduction of chromium and iron, often improves 50
DEG C, the degree of metalization of chromium and iron can improve 10%~25%, and in 1450 DEG C~1500 DEG C temperature ranges, comprehensive degree of metalization can
Up to 70%~85%.
Further, the reducing roasting process produces degree of metalization instead of the first step in traditional two step method
High pelletizing substitutes high carbon ferro-chrome, and silicochromium is generated in electric reaction in furnace with silica and coke.Compared to traditional two step method
Technique, step S2, the mixture in S3, S4 is molded, drying, reduction roasting process includes transporting and sizing process, and into
Loss material in type and roasting process can be used as return material to be utilized again, and loss of material is small, and chromium recovery ratio is more than 90%, carries
It is high by 3%~5%.In addition, different from electric furnace smelting, reduction roasting belongs to low-temperature reduction, therefore this produces ton using this method
Silicochromium power consumption reduces 1%~7%.
The invention also discloses a kind of systems for producing silicochromium, which is characterized in that including：
Mixing device, ball-making device, green-ball screening plant, drying unit, rotary hearth furnace device, feeding device and electric furnace dress
It puts；
The mixing device includes dispensing buffering chamber, blending bunker and the feed inlet for being connected to the dispensing buffering chamber
Fine chrome mine filler bin, dolomite dust feed bin, reducing agent filler bin, binding agent feed bin, returning charge storehouse；The blending bunker enters including powder
Mouth, filler and discharge port, the powder entrance of the blending bunker are connected with the discharge port of the dispensing buffering chamber；
The ball-making device include be connected with the discharge port of the blending bunker mixture entrance, water inlet, balling disk (-sc) and
Green-ball exports, for mixture to be prepared into the green-ball of suitable particle size；
The green-ball screening plant includes big granularity screening device, small grain size screening plant and the connection big granularity sieve
Separating device screenings exports and the travelling belt of small grain size screening plant entrance, the big granularity screening device enter including green-ball
Mouth, oversize outlet and screenings outlet, the small grain size screening plant include entrance, oversize outlet and screenings and export,
The mixture entrance that the big granularity oversize of gained and small grain size screenings return to the ball-making device carries out pelletizing again；
The drying unit includes drying grate, dry bulb outlet and is connected with the oversize outlet of the small grain size screening plant
Green-ball entrance, for the aqueous pelletizing for meeting granularity requirements to be dried processing；
The rotary hearth furnace device includes the feed inlet, preheating zone, reducing zone, cooling zone and the discharging that are annularly sequentially arranged
Mouthful, the feed inlet is connected with dry bulb outlet, and the rotary hearth furnace device is used for dry bulb reduction roasting, obtains roasting ball
Group；
The feeding device, including the agglomerates buffering chamber being connected with the discharge port of the rotary hearth furnace, silica feed bin is burnt
Charcoal feed bin, feeding warehouse, the agglomerates buffering chamber, silica feed bin, coke feed bin are connected to the feeding warehouse, the charging dress
It puts to convey material into electric furnace；
The furnace device includes electric furnace ontology, tapping hole and slag notch, and the charging is connected above the furnace device
Storehouse, the furnace device is for smelting silicochromium product, and for discharging the alloy product smelted, slag notch is used to arrange tapping hole
Go out the waste residue in smelting process.
The beneficial effects of the utility model are：
(1) it realizes and directly produces silicochromium using chromogen miberal powder, reduce the operating technology difficulty of silicochromium.
(2) compared with the two step method of traditional silicochromium (high carbon ferro-chrome-silicochromium), reduce what ton silicochromium was smelted
Power consumption 1%~7% improves the chromium metal recovery 3%~5% of silicochromium smelting.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model from the following description of the accompanying drawings of embodiments will
It becomes apparent and is readily appreciated that, wherein：
Fig. 1 is the structure diagram for the system that silicochromium is produced in the utility model.
Fig. 2 is the flow diagram for the method that silicochromium is produced in the utility model.
Specific embodiment
The embodiment of the utility model is described below in detail, the example of embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the utility model, and it is not intended that limitation to the utility model.
Attached drawing 1 according to the present utility model shows a kind of system for producing silicochromium, specifically includes：
Mixing device 1, ball-making device 2, green-ball screening plant 3, drying unit 4, rotary hearth furnace device 5, feeding device 6 and electricity
Furnace apparatus 7；
The mixing device 1 include dispensing buffering chamber 15, blending bunker 16 and be connected to the dispensing buffering chamber 15 into
The fine chrome mine filler bin 10 of material mouth, dolomite dust feed bin 11, reducing agent filler bin 12, binding agent feed bin 13, returning charge storehouse 14；It is described
Blending bunker 16 includes powder entrance, filler 17 and discharge port, the powder entrance of the blending bunker 16 and the batch bin 15
Discharge port is connected；
The ball-making device 2 includes the mixture entrance, water inlet, the balling disk (-sc) that are connected with the discharge port of the blending bunker 16
It is exported with green-ball；
The green-ball screening plant 3 includes big granularity screening device, small grain size screening plant and travelling belt, described big
Granularity screening device includes green-ball entrance, oversize outlet and screenings outlet, and the small grain size screening plant includes entrance, sieve
Upper object outlet and screenings outlet, the big granularity screening device screenings outlet and small grain size screening plant entrance pass through transport
Belt connects, and the oversize outlet of the big granularity screening device of gained and the screenings outlet of small grain size screening plant connect ball dress processed
Put 2 mixture entrance, excessive, the too small green-ball that this is sifted out at two return the mixture entrance of the ball-making device 2 into
Capable pelletizing again；
The drying unit 4 includes drying grate, dry bulb outlet and exports phase with the oversize of the small grain size screening plant
Green-ball entrance even, for the aqueous pelletizing for meeting granularity requirements to be dried processing；
The rotary hearth furnace device 5 includes the feed inlet, preheating zone, reducing zone, cooling zone and the discharging that are annularly sequentially arranged
Mouthful, the feed inlet is connected with dry bulb outlet, and bead screening plant, bead screening plant sieve are equipped at the feed inlet
Lower object exports ground device connection returning charge storehouse, for weeding out the broken little particle in transport process, the little particle warp under sieving
The returning charge storehouse 14 of the mixing device 1 is returned to after grinding, the rotary hearth furnace device 5 is used to, by dry bulb reduction roasting, be roasted
Pelletizing；
The feeding device 6 includes the agglomerates buffering chamber 61 being connected with the discharge port of the rotary hearth furnace device 5, also wraps
Silica feed bin 62 is included, coke feed bin 63, feeding warehouse 64, the agglomerates buffering chamber 61, silica feed bin 62, coke feed bin 63 connect
The feeding warehouse 64 is passed to, the feeding device 6 is used to convey material into furnace device 7；
The furnace device 7 includes electric furnace ontology, tapping hole and slag notch, 7 top connection of the furnace device it is described into
Feed bin 64, the furnace device 7 is for smelting silicochromium product, and tapping hole is for the alloy product of discharge smelting, slag notch
For discharging the waste residue in smelting process.
The utility model additionally provides a kind of production method using above system production silicochromium, referring to Fig. 2, method
Specifically include following steps：
S1, by chromogen miberal powder, dolomite dust (can be not added with), reducing agent powder by certain proportioning, add a certain amount of bonding
Agent and water carry out mixing, obtain mixture；Chromogen miberal powder, dolomite dust (can be not added with), reducing agent powder, binding agent are respectively put into chromium
Returning charge in concentrate filler bin 10, dolomite dust feed bin 11, reducing agent filler bin 12, binding agent feed bin 13, with returning charge storehouse 14 is pressed
Certain proportioning caches after weighing into dispensing buffering chamber 15, after the powder entrance through blending bunker 16 enter blending bunker 16, mix
After expecting a period of time, mixture is obtained after adding a certain amount of water mixing by filler 17；
S2 and then pressure ball or pelletizing processing are carried out to mixture makes the mixture be molded to obtain molding pelletizing；Mixture
Mixture entrance through ball-making device 2 transports and pelletizing is carried out on balling disk (-sc), while by the water inlet of ball-making device 2 to mixed
Material constantly watering is closed, green-ball, green-ball entrance of the gained green-ball through green-ball screening plant 3 are obtained after balling disk (-sc) operates a period of time
Into big granularity screening device, screenings carries out sizing, obtained satisfaction grain through belt-conveying to small grain size screening plant
The green-ball of requirement is spent, the oversize at big granularity screening device and the screenings at small grain size screening plant return to ball-making device 2
Mixture entrance, for re-starting pelletizing after the aqueous pelletizing for not meeting granularity requirements is crushed；
S3, the molding pelletizing is dried to obtain dry pelletizing；The oversize outlet and baking of small grain size screening plant
The green-ball entrance of equipment for drying 4 is connected, for the aqueous pelletizing for meeting granularity requirements to be dried processing；Green-ball obtains after drying
It exports and discharges from dry bulb to dry pelletizing.
S4, the dry pelletizing progress reduction roasting is obtained into agglomerates；The dry bulb outlet of drying unit 4 and rotary hearth furnace
The feed inlet of device 5 is connected, and reduction roasting is carried out for drying unit 4 to be dried to obtained drying pelletizing；
S5, the agglomerates and silica, coke are added in the deep reduction of progress in electric furnace together, obtains silicochromium；Add
Material device 6 agglomerates buffering chamber be connected with the discharge port of rotary hearth furnace device 5 to accept agglomerates, later with silica feed bin
62nd, the silica in coke feed bin 63 and coke, which are sent into together in feeding warehouse 64, mixes, and mixed material is sent into feeding warehouse 64
In furnace device 7.
More specifically, the granularity of each powder is less than 1mm in the mixture, when being molded using pelletizing mode, it is desirable that its
Middle granularity accounts for more than 85% less than 0.074mm, when using pressure ball mode balling-up, then wherein granularity is required to account for 95% less than 1mm
More than.
More specifically, the molding pelletizing grain size is 8~30mm, grain size is too small, and furnace charge air permeability is poor, is unfavorable for electric furnace life
Production, grain size is excessive, and reduction roasting difficulty is big, is susceptible to the halfway situation of reduction.
More specifically, the chromogen miberal powder requirement chromium content and the ratio of iron content (in terms of mass parts) are not less than 1.30,
Preferred scope is 1.5~2.0, content of MgO and Al2O3The ratio of content is not less than 1, and preferred scope is 1.2~1.8.It can be used and match
The mode of ore deposit obtains satisfactory chromogen miberal powder.Thereby guarantee that the chromium content of gained silicochromium product is up to standard, while advantageous
In reducing slag melting, ensure that slag fluidity is good during electric furnace smelting, easily slags tap, reduce operating technology difficulty.
More specifically, the dolomite dust weight account for chromogen miberal powder weight 0%~20% (amount of dolomite can be minimum
To being not added with, add more preferable), its object is to improve content of MgO and Al in mixture2O3The ratio of content, reduce content of MgO with
Al2O3The usage amount of the high and expensive chromogen miberal powder of the ratio of content, in addition, dolomite can decompose in the reduction roasting stage,
Generate CO2Gas increases the porosity of pelletizing, is conducive to the degree of metalization of pelletizing after increase reduction roasting, can improve synthesis
Degree of metalization 2%~9%.
More specifically, the reducing agent powder is one kind in the carbonaceous reducing agents such as coke, semi-coke, anthracite, match reduction
The mole of the total fixed carbon of agent is mistake in chromogen miberal powder 1.3-1.6 times of the mole of oxygen in ferriferous oxide and chromated oxide
The reduction of few unfavorable chromium and iron, and appropriate residual carbon advantageously forms the carbide of chromium and iron, such as Fe3C and Cr7C3, this two kinds
Substance can react generation CrSi or FeSi with restoring Si during follow-up electric furnace smelting, so as to promote carbon during electric furnace smelting
To SiO2Reduction, shown in the reaction occurred such as formula (1) and formula (2)；Crossing at most pellet strength can be deteriorated, and scaling loss can also increase
Add, reduction effect is deteriorated, and is also unfavorable for reducing cost.
Cr7C3+ 7Si=7CrSi+3C (1)
Fe3C+3Si=3FeSi+3C (2)
More specifically, the binding agent is bentonite or the mixture of bentonite and starch, the additive amount of the binding agent
3%~8% for chromogen miberal powder weight.
The additive amount of coke described in step S5 is the 40%~60% of the chromogen miberal powder weight,
The additive amount of the silica is the 80%~120% of the chromogen miberal powder weight.
More specifically, the drying temperature is 100-150 DEG C, the reduction roasting temperature of the reducing roasting process is 1400
DEG C~1550 DEG C, preferred scope is 1450 DEG C~1500 DEG C, and temperature is too low, is unfavorable for the reduction of chromium and iron, often improves 50 DEG C, chromium
10%~25% can be improved with the degree of metalization of iron, in 1450 DEG C~1500 DEG C temperature ranges, comprehensive degree of metalization is reachable
70%~85%.
More specifically, the reducing roasting process produces degree of metalization height instead of the first step in traditional two step method
Pelletizing substitute high carbon ferro-chrome, generate silicochromium in electric reaction in furnace with silica and coke.Compared to traditional two step method work
Skill, step S2, the mixture molding in S3, S4, drying, reduction roasting process include transport and sizing process, and are molded
Return material can be used as to be utilized again with the loss material in roasting process, loss of material is small, and chromium recovery ratio is more than 90%, improves
3%~5%.In addition, different from electric furnace smelting, reduction roasting belongs to low-temperature reduction, therefore this produces ton silicon using this method
Evanohm power consumption reduces 1%~7%.
Specific embodiment：
Embodiment 1：
Ferrochrome ratio is 1.30, MgO/Al2O3For 1.00 100 parts of chromogen miberal powder, 27 parts of (moles of fixed carbon of semi-coke powder
1.3 times for the mole of oxygen in ferriferous oxide in chromogen miberal powder and chromated oxide), 20 parts of dolomite, 2 parts of bentonite, starch 1
Part, 8 parts of mixings in batch mixer of water carry out pelletizing after mixing, and spherolite degree is 8~12mm, and gained wet bulb is at 100-150 DEG C or so
Drying, pelletizing carries out reduction roasting after drying, and reduction roasting temperature is 1400 DEG C, and the synthesis degree of metalization of pelletizing is about after roasting
60%, pelletizing compression strength about 550N/ balls after roasting.100 parts of pelletizing after roasting, with 40 parts of coke, 80 parts of silica is put together
Enter in electric furnace and smelted, chromium content 35.18%, the silicochromium of silicone content 35.02%, more traditional work are can obtain after smelting
Skill, melting electric consumption reduce 2.3%, and chromium recovery ratio 90.2% improves 3.2%.
Embodiment 2：
Ferrochrome ratio is 1.88, MgO/Al2O3For 1.72 100 parts of chromogen miberal powder, 23 parts of (moles of fixed carbon of coke blacking
1.4 times for the mole of oxygen in ferriferous oxide in chromogen miberal powder and chromated oxide), 5 parts of dolomite, 4 parts of bentonite, starch
1.2 parts, 11 parts of mixings in batch mixer of water carry out pelletizing after mixing, and spherolite degree is 8~10mm, and gained wet bulb is at 100-150 DEG C
Left and right drying, pelletizing carries out reduction roasting after drying, and reduction roasting temperature is 1450 DEG C, the synthesis degree of metalization of pelletizing after roasting
About 70%, pelletizing compression strength about 500N/ balls after roasting.100 parts of pelletizing after roasting, with 50 parts of coke, 100 parts of silica is together
It is put into electric furnace and is smelted, chromium content 36.05%, the silicochromium of silicone content 42.36%, more traditional work are can obtain after smelting
Skill, melting electric consumption reduce 3.5%, and chromium recovery ratio 91.2% improves 4.8%.
Embodiment 3：
Ferrochrome ratio is 1.50, MgO/Al2O3For 1.20 100 parts of chromogen miberal powder, 27 parts of (moles of fixed carbon of semi-coke powder
1.3 times for the mole of oxygen in ferriferous oxide in chromogen miberal powder and chromated oxide), 15 parts of dolomite, bentonite 8,10 parts of water
The mixing in batch mixer, carries out pelletizing after mixing, and spherolite degree is 10~30mm, and gained wet bulb is dried in 100-150 DEG C or so drying
Pelletizing carries out reduction roasting after dry, and reduction roasting temperature is 1500 DEG C, the synthesis degree of metalization about 78% of pelletizing after roasting, roasting
Pelletizing compression strength about 450N/ balls afterwards.100 parts of pelletizing after roasting, with 60 parts of coke, 120 parts of silica is put into togerther in electric furnace
It is smelted, chromium content 31.59% is can obtain after smelting, the silicochromium of silicone content 45.17% is compared with traditional handicraft, melting electric consumption
4.6% is reduced, chromium recovery ratio 91% improves 4.5%.
Embodiment 4：
Ferrochrome ratio is 2.00, MgO/Al2O3For 1.80 100 parts of chromogen miberal powder, 25 parts of (moles of fixed carbon of anthracite
1.6 times for the mole of oxygen in ferriferous oxide in chromogen miberal powder and chromated oxide), 6 parts of bentonite, 2 parts of starch, 10 parts of water exists
Mixing in batch mixer carries out pelletizing after mixing, and spherolite degree is 8~12mm, and gained wet bulb is in 100-150 DEG C or so drying, drying
Pelletizing carries out reduction roasting afterwards, and reduction roasting temperature is 1550 DEG C, the synthesis degree of metalization about 90% of pelletizing after roasting, after roasting
Pelletizing compression strength about 400N/ balls.Will 100 parts of pelletizing after roasting, and 48 parts of coke, 100 parts of silica be put into togerther in electric furnace into
Row is smelted, and chromium content 36.11% is can obtain after smelting, the silicochromium of silicone content 44.12% is compared with traditional handicraft, melting electric consumption drop
Low 6.9%, chromium recovery ratio 91.5% improves 5.2%.
Embodiment 5：
Ferrochrome ratio is 2.00, MgO/Al2O3For 1.80 100 parts of chromogen miberal powder, 20 parts of (moles of fixed carbon of anthracite
1.3 times for the mole of oxygen in ferriferous oxide in chromogen miberal powder and chromated oxide), 3 parts of bentonite, 10 parts of water is in batch mixer
Mixing, carries out pelletizing after mixing, and spherolite degree is 8~12mm, gained wet bulb after 100-150 DEG C or so drying, drying pelletizing into
Row reduction roasting, reduction roasting temperature are 1500 DEG C, the synthesis degree of metalization about 85% of pelletizing, pelletizing resistance to compression after roasting after roasting
Intensity about 400N/ balls.100 parts of pelletizing after roasting, with 48 parts of coke, 100 parts of silica, which is put into togerther in electric furnace, to be smelted, smelting
It can obtain chromium content 36.15% after refining, compared with traditional handicraft, melting electric consumption reduces the silicochromium of silicone content 43.85%
6.2%, chromium recovery ratio 91.3% improves 4.9%.
Embodiment 6：
Ferrochrome ratio is 1.50, MgO/Al2O3For 1.20 100 parts of chromogen miberal powder, 21 parts of (moles of fixed carbon of anthracite
1.3 times for the mole of oxygen in ferriferous oxide in chromogen miberal powder and chromated oxide), 15 parts of dolomite, bentonite 3,10 parts of water
The mixing in batch mixer, carries out pelletizing after mixing, and spherolite degree is 10~30mm, and gained wet bulb is dried in 100-150 DEG C or so drying
Pelletizing carries out reduction roasting after dry, and reduction roasting temperature is 1500 DEG C, the synthesis degree of metalization about 80% of pelletizing after roasting, roasting
Pelletizing compression strength about 400N/ balls afterwards.100 parts of pelletizing after roasting, with 60 parts of coke, 120 parts of silica is put into togerther in electric furnace
It is smelted, chromium content 33.32% is can obtain after smelting, the silicochromium of silicone content 42.43% is compared with traditional handicraft, melting electric consumption
4.6% is reduced, chromium recovery ratio 91.1% improves 4.5%.
While there has been shown and described that the embodiment of the utility model, it will be understood by those skilled in the art that：
In the case of the principle and objective for not departing from the utility model can these embodiments be carried out with a variety of variations, modification, replaced
And modification, the scope of the utility model are limited by claim and its equivalent.
Claims (1)
1. a kind of system for producing silicochromium, which is characterized in that including：
Mixing device, ball-making device, green-ball screening plant, drying unit, rotary hearth furnace device, feeding device and furnace device；
The mixing device include dispensing buffering chamber, blending bunker and be connected to the dispensing buffering chamber feed inlet fine chrome mine
Filler bin, dolomite dust feed bin, reducing agent filler bin, binding agent feed bin, returning charge storehouse；The blending bunker includes powder entrance, adds
The mouth of a river and discharge port, the powder entrance of the blending bunker are connected with the discharge port of the dispensing buffering chamber；
The ball-making device includes the mixture entrance being connected with the discharge port of the blending bunker, water inlet, balling disk (-sc) and green-ball
Outlet；
The green-ball screening plant includes big granularity screening device, small grain size screening plant and the connection big sizing dress
The travelling belt of screenings outlet and small grain size screening plant entrance is put, the big granularity screening device includes green-ball entrance, sieve
Upper object outlet and screenings outlet, it is big that the small grain size screening plant includes entrance, oversize outlet and screenings outlet, gained
The mixture entrance that granularity oversize and small grain size screenings return to the ball-making device carries out pelletizing again；
The drying unit includes drying grate, dry bulb outlet and the life being connected with the oversize outlet of the small grain size screening plant
Ball entrance；
The rotary hearth furnace device includes the feed inlet, preheating zone, reducing zone, cooling zone and the discharge port that are annularly sequentially arranged, institute
It states feed inlet with dry bulb outlet to be connected, bead screening plant is equipped at the feed inlet, for weeding out in transport process
Broken little particle, little particle under sieving is polished to return to returning charge storehouse；
The feeding device, including the agglomerates buffering chamber being connected with the discharge port of the rotary hearth furnace, silica feed bin, coke material
Storehouse, feeding warehouse, the agglomerates buffering chamber, silica feed bin, coke feed bin are connected to the feeding warehouse；
The furnace device includes electric furnace ontology, tapping hole and slag notch, and the feeding warehouse is connected above the furnace device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720992679.6U CN207596923U (en) | 2017-08-09 | 2017-08-09 | A kind of system for producing silicochromium |
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