CN106086289B - A kind of method for making steel and device of the smelting stainless steel mother liquid that dusted using top blow oxygen lance - Google Patents
A kind of method for making steel and device of the smelting stainless steel mother liquid that dusted using top blow oxygen lance Download PDFInfo
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- CN106086289B CN106086289B CN201610620253.8A CN201610620253A CN106086289B CN 106086289 B CN106086289 B CN 106086289B CN 201610620253 A CN201610620253 A CN 201610620253A CN 106086289 B CN106086289 B CN 106086289B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A kind of method for making steel and device of the smelting stainless steel mother liquid that dusted using top blow oxygen lance, the method use a special top blow oxygen lance, and converting process takes control by stages mode, using duff pipe with CO2Or N2The required pulvis of smelting stainless steel mother liquid is sprayed into at a high speed bath for carrier gas, O is blown into stove respectively using the first oxygen runner spray orifice and the second oxygen runner spray orifice2, wherein the O of the first oxygen runner spray orifice injection2For the burning of coal dust, oxygen and coal dust burn to form thermal-flame in pulvis exit, and pulvis is drastically heated and generates the O that heat is broken, and promotion pulvis is dissolved and reduced in clinker, and the second oxygen runner spray orifice is blown2For the second-time burning of furnace gas, advantageous effect is, compared with traditional chrome ore smelting reduction process, the scope of application is wider, reaction efficiency higher, suitable for 50 ~ 350 first furnace of stainless steel, the duration of heat shortens more than 3min, and chrome ore recovery rate improves more than 1.0%, slag making materials consumption reduces by more than 10%, and ton steel cost reduces by 10 yuan or more.
Description
Technical field
It is more particularly to a kind of to be dusted smelting stainless steel mother using top blow oxygen lance the invention belongs to stainless steel smelting technical field
The method for making steel and device of liquid.
Background technology
With the exploitation of converter top bottom compositing blowing steelmaking technology, the integrated iron and steel works based on blast furnace ironmaking also begin to
The production of stainless steel.During smelting stainless steel, the expense of steel scrap and chromium, nickel alloy etc. accounts for the 70% of entire stainless steel smelting cost, institute
If cheap chromium, nickel resources can be developed to replace the expensive chromium, the nickel alloy that use at present, to reducing cost with important
Meaning.
Chrome ore smelting reduction process is chrome ore to be fitted into before stainless steel refining in dedicated just furnace, using coke or
Chrome ore is melted and reduces chromium into molten steel at the beginning of producing stainless steel by the strong reducing power of the reaction heat and carbon of coal and oxygen
The technique for refining molten metal.
But chrome ore reduction is a complex process, and since chrome ore fusing point itself is high, when making reducing agent with coke or coal, reduction
It reacts for the alternate reaction of solid-solid, hardly results in higher reduction rate；In order to solve this problem, it is necessary to chrome ore be made first to dissolve
In clinker, then the chromated oxide in slag is reduced by the carbon in clinker or molten metal.
Traditional method that block chrome ore and coke are added into stove, the specific surface area of material is small, dissolving and reduction rate
It is relatively slow, it is difficult to meet the needs for smelting rhythm；Kawasaki, Japan iron uses special water cooled lance, and chrome ore is blown into stove
Sand accelerates dissolving and the rate of reduction of chrome ore, but fire door need to be inserted into podwer gun and oxygen rifle simultaneously, at the beginning of not being suitable for small tonnage
Furnace, and coke and lime are still added in bulk form by fire door, limit slag making and rate of reduction, and there are still one for the technique
Fixed limitation.
The present invention propose it is a kind of using top blow oxygen lance dust smelting stainless steel mother liquid method for making steel and used top blast
Oxygen rifle, a top blow oxygen lance are blown chromite ore fine, coal dust, pulverized limestone and oxygen simultaneously, are just refined suitable for 50 ~ 350 tons of stainless steels
Stove meets the requirement of chrome ore high-efficiency dissolution and reduction.
The content of the invention
The purpose of the present invention is being blown chromite ore fine, coal dust, pulverized limestone and oxygen simultaneously into stove by a top blow oxygen lance,
Required pulvis sprays into bath with high speed powder stream condition, and pulvis is made to be come into full contact with molten bath, realizes chromite ore fine, coal dust and stone
Quick dissolving of the ashes in clinker, dissolved Cr2O3It contacts and is reduced with the carbon in clinker or molten metal, melted for chrome ore
Melt reduction and create good thermodynamics and kinetics condition, accelerate reaction rate, improve the recovery rate of chrome ore.
For above-mentioned purpose, the present invention adopts the following technical scheme that：
A kind of method for making steel for the smelting stainless steel mother liquid that dusted using top blow oxygen lance, the method use a special top
Oxygen-blowing gun, converting process takes control by stages mode, using duff pipe with CO2Or N2It is carrier gas by smelting stainless steel mother liquid institute
The pulvis needed sprays at a high speed bath, is blown respectively into stove using the first oxygen runner spray orifice and the second oxygen runner spray orifice
O2, wherein the O of the first oxygen runner spray orifice injection2For the burning of coal dust, oxygen and coal dust burn to form high temperature in pulvis exit
Flame, pulvis are drastically heated and generate heat and crush, and pulvis is promoted to dissolve and reduce in clinker, the spray of the second oxygen runner spray orifice
The O blown2For the second-time burning of furnace gas, predominantly physical-chemical reaction provides heat in molten bath heating and stove, reduce coal dust and
The consumption of oxygen.
Further, the pulvis sprayed by the top blow oxygen lance in stove is the mixed powder of chromite ore fine, coal dust and pulverized limestone,
Powder particles scope is 80 ~ 300 mesh, and wherein chromite ore fine provides the required chromium of smelting stainless steel mother liquid, and coal dust is as combustion
Material and reducing agent, pulverized limestone is for slag making and maintains basicity of slag, and the mixing of pulvis can select premix mode or non-premix
Mode.
Further, the strong mixing mode that the method for making steel is supplied oxygen using bottom or side supplies oxygen, bottom blowing/side-blown
Oxygen supply intensity is 0.5 ~ 1.5Nm3/ t/min strengthens melting bath stirring, accelerates metallurgical reaction rate, promotes slag steel balance, improves chromium
The recovery rate of ore deposit.
Further, the method step is as follows：
Step 1：The materials such as molten iron and steel scrap are packed into stove, with N in converting process by melting sources and heating2Or CO2For
Carrier gas is blown pulverized limestone and coal dust, and the injection flow of pulverized limestone is 100 ~ 600kg/min, the injection flow of coal dust for 80 ~
600kg/min, it is 2.3 ~ 3.0 to control basicity of slag, and molten bath [C] content is maintained to be basically unchanged, and top blow oxygen lance is grasped using high rifle position
Make, improve post-combustion rate, be rapidly heated, top blast oxygen supply intensity is 2.0 ~ 2.5Nm3/ t/min, bottom blowing/side-blown oxygen supply intensity are
0.5~1.0Nm3/ t/min improves bath temperature to 1540 ~ 1600 DEG C；
Step 2：Chrome ore melting and reducing, with N in converting process2Or CO2Chromite ore fine and coal dust, chromium are blown for carrier gas big flow
The injection flow of miberal powder is 300 ~ 1500kg/min, and the injection flow of coal dust is 100 ~ 800kg/min, and it is appropriate to be needed according to slag making
Pulverized limestone is blown, the injection flow of pulverized limestone is 30 ~ 300kg/min, and top blast oxygen supply intensity is 2.5 ~ 3.0Nm3/ t/min, passes through
The combustion heat release of coal dust and furnace gas maintains bath temperature, in order to accelerate the dissolving of chromite ore fine and rate of reduction, bottom blowing/side-blown oxygen supply
Intensity is 0.8 ~ 1.5Nm3/ t/min strengthens melting bath stirring；
Step 3：Final reduction stops top blast oxygen supply and dusts, and the gaseous mixture of bottom blowing/side-blown inert gas and oxygen is lazy
Property gas be mixed into ratio as 0 ~ 50%, reduce CO partial pressures, increase bottom blowing/side-blown intensity to 1.0 ~ 1.5Nm3/ t/min, enhancing are molten
Pond is stirred, and promotes Cr in slag2O3Final reduction, improve Cr2O3Recovery rate.
A kind of device for the smelting stainless steel mother liquid that dusted using top blow oxygen lance, including a top blow oxygen lance, the top blow oxygen lance
Including the second duff pipe, oxygen cathete, water inlet pipe, return pipe and oxygen lance nozzle, second duff pipe is arranged at the top blowing oxygen
Rifle center, described second duff pipe one end are connected with the oxygen lance nozzle, and second duff pipe periphery one week is oxygen cathete, institute
It states and water inlet pipe and return pipe is set outside oxygen cathete, the oxygen lance nozzle is provided centrally with powder injection hole, the powder injection hole and described the
Two duff pipes connect, and multiple the first oxygen runner spray orifices and the second oxygen runner connected with oxygen cathete are additionally provided on the oxygen lance nozzle
Spray orifice, the first oxygen runner spray orifice and the second oxygen runner spray orifice annular centered on the axis of oxygen lance nozzle are set, institute
State that the first oxygen runner spray orifice is parallel with the axis of the oxygen lance nozzle, the axis of the second oxygen runner spray orifice and the oxygen lance nozzle
Line is in 18-25 ° of angle.
Further, described device further includes：First furnace, the first duff pipe, coal dust storage tank, pulverized limestone storage tank, chromite ore fine
Storage tank, first duff pipe are connected with the second duff pipe other end, the coal dust storage tank, pulverized limestone storage tank, chromite ore fine
Storage tank is connected with first duff pipe.
Further, the coal dust storage tank, pulverized limestone storage tank, chromite ore fine storage tank connect with a premix material spray tank one end
It connects, the premix material spray tank other end connects first duff pipe.
The beneficial effects of the present invention are compared with traditional chrome ore smelting reduction process, the scope of application is wider, reaction efficiency
Higher, suitable for 50 ~ 350 first furnace of stainless steel, the duration of heat shortens more than 3min, and chrome ore recovery rate improves more than 1.0%,
Slag making materials consumption reduces by more than 10%, and ton steel cost reduces by 10 yuan or more.
Description of the drawings
Fig. 1 is the apparatus structure schematic diagram of three smelting stainless steel mother liquid of the embodiment of the present invention；
Fig. 2 is the top blow oxygen lance schematic diagram that smelting stainless steel mother liquid process of the present invention uses；
Fig. 3 is the apparatus structure schematic diagram of four smelting stainless steel mother liquid of the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiies
Change, equivalent method and scheme.Further, in order to which the public is made to have a better understanding the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
A kind of method for making steel for the smelting stainless steel mother liquid that dusted using top blow oxygen lance, the method for making steel are suitable for 50 ~ 350
Just furnace, the method use a special top blow oxygen lance to the stainless steel of ton, and the oxygen lance nozzle of the top blow oxygen lance is equipped with
Multiple first oxygen runner spray orifices and the second oxygen runner spray orifice, the first oxygen runner spray orifice and the second oxygen runner spray orifice are with oxygen
Annular is set centered on the axis of gun sprayer, and the first oxygen runner spray orifice is parallel with the axis of the oxygen lance nozzle, and described the
The axis of two oxygen runner spray orifices and the oxygen lance nozzle is in 18-25 ° of angle.Using first, second duff pipe with CO2And N2To carry
The required pulvis of smelting stainless steel mother liquid is sprayed at a high speed bath by gas, utilizes the first oxygen runner spray orifice and the second oxygen runner
Spray orifice is respectively by O2It sprays into stove, wherein the first oxygen runner spray orifice is used for the burning of coal dust, oxygen and coal dust are in pulvis exit
Burning forms high temperature, reproducibility flame, and pulvis is drastically heated and generates heat and crush, and pulvis is promoted to dissolve and go back in clinker
Original, the second oxygen runner spray orifice are used for the second-time burning of furnace gas, and predominantly physical-chemical reaction provides heat in molten bath heating and stove,
The consumption of coal dust and oxygen is reduced, the method step is as follows：
Step 1：The materials such as molten iron and steel scrap are packed into stove, with N in converting process by melting sources and heating2Or CO2For
Carrier gas is blown pulverized limestone and coal dust, and the injection flow of pulverized limestone is 100 ~ 600kg/min, the injection flow of coal dust for 80 ~
600kg/min, it is 2.3 ~ 3.0 to control basicity of slag, and molten bath [C] content is maintained to be basically unchanged, and top blow oxygen lance is grasped using high rifle position
Make, improve post-combustion rate, be rapidly heated, top blast oxygen supply intensity is 2.0 ~ 2.5Nm3/ t/min, bottom blowing/side-blown oxygen supply intensity are
0.5 ~ 1.0Nm3/t/min improves bath temperature to 1540 ~ 1600 DEG C.
Step 2：Chrome ore melting and reducing, with N in converting process2Or CO2Chromite ore fine and coal dust, chromium are blown for carrier gas big flow
The injection flow of miberal powder is 300 ~ 1500kg/min, and the injection flow of coal dust is 100 ~ 800kg/min, and it is appropriate to be needed according to slag making
Pulverized limestone is blown, the injection flow of pulverized limestone is 30 ~ 300kg/min, and top blast oxygen supply intensity is 2.5 ~ 3.0Nm3/ t/min, passes through
The combustion heat release of coal dust and furnace gas maintains bath temperature, in order to accelerate the dissolving of chromite ore fine and rate of reduction, bottom blowing/side-blown oxygen supply
Intensity is 0.8 ~ 1.5Nm3/ t/min strengthens melting bath stirring.
Step 3：Final reduction stops top blast oxygen supply and dusts, and the gaseous mixture of bottom blowing/side-blown inert gas and oxygen is lazy
Property gas be mixed into ratio as 0 ~ 50%, reduce CO partial pressures, increase bottom blowing/side-blown intensity to 1.0 ~ 1.5Nm3/ t/min, enhancing are molten
Pond is stirred, and promotes Cr in slag2O3Final reduction, improve Cr2O3Recovery rate.
【Embodiment one】
The present invention is for the GOR converters of 60 tons of conventional smelting stainless steels, and the mixing of pulvis is using non-premix mode, duff pipe
Road is successively by coal dust spray tank, lime injection tank and chromite ore fine spray tank, and the taste of chromite ore fine is 48 ~ 50%, the grain of pulvis
Degree scope is 80 ~ 200 mesh, is connected powder spraying apparatus meal outlet with the powder inlet on oxygen gun body using abrasion-proof ceramic hose, oxygen
The ceramic composite steel pipe that the center duff pipe of rifle uses, the powder injection hole of oxygen lance nozzle is the ceramic gradual shrinkage spray orifice of interior edge.Oxygen rifle
The powder injection hole periphery of nozzle is enclosed with 6 the first oxygen runner spray orifices and 8 the second oxygen runner spray orifices, the first oxygen runner spray orifice and oxygen
Gun axis line is parallel, and the second oxygen runner spray orifice is in 18 ° of angles with oxygen rifle axis.
Specifically smelting Discrete control process is：
The materials such as molten iron and steel scrap are packed into stove and start to blow, according to slag making in converting process by fusing and heating step
It needing to be blown pulverized limestone, the injection flow of pulverized limestone is 120 ~ 150kg/min,（It is light-burned）Dolomite is added in by fire door, clinker alkali
Degree control is 2.3 ~ 3.0；Top blast oxygen supply intensity is 2.0 ~ 2.5Nm3/ t/min, with N2For carrier gas coal injection, the injection stream of coal dust
It measures as 100 ~ 150kg/min, which is not blown chromite ore fine；In order to accelerate slugging, bottom blowing oxygen supply intensity is 0.6 ~ 0.8Nm3/t/
min；The target of the step is to improve bath temperature to 1540 ~ 1580 DEG C.
Chrome ore melting and reducing step, in order to maintain basicity of slag, is blown pulverized limestone on a small quantity；Top blast oxygen supply intensity for 2.5 ~
3.0Nm3/ t/min, with CO2Chromite ore fine and coal dust are blown for carrier gas, the wherein injection flow of chromite ore fine is 350 ~ 400kg/min,
The injection flow of coal dust is 150 ~ 200kg/min, is operated using high rifle position, improves post-combustion rate, maintains bath temperature；In order to
Strengthen melting bath stirring, accelerate chromite ore fine dissolving and reduction, bottom blowing oxygen supply intensity is 0.8 ~ 1.0Nm3/t/min。
Final reduction step stops top blast oxygen supply and dusts, bottom blowing N2With the gaseous mixture of oxygen, N2Be mixed into ratio for 30 ~
50%, increase bottom blowing intensity to 1.0 ~ 1.3Nm3/ t/min enhances melting bath stirring, promotes in slag（Cr2O3）Final reduction, improve
（Cr2O3）Recovery rate.
Result of implementation shows：60 tons of GOR converters dusted using top blow oxygen lance smelting stainless steel mother liquid technique after, it is more traditional
Addition ferrochrome and stainless steel scrap technique, lime consumption reduce by 15%, ton steel cost reduce by 30 yuan.
【Embodiment two】
The present invention is for 180 tons of chrome ore melting and reducing converters, and the mixing of pulvis is using premix mode, coal dust storage tank, lime
According to the mixed proportion blanking of technological requirement to spray tank, defeated powder carrier gas is pre- by spray tank conveying for powder storage tank and chromite ore fine storage tank
Mixed pulvis, the taste of chromite ore fine is 48 ~ 50%, and the particle size range of pulvis is 80 ~ 300 mesh, will be dusted and set using abrasion-proof ceramic hose
Standby meal outlet is connected with the powder inlet on oxygen gun body, the antifriction alloy steel pipe of the center duff pipe use of oxygen rifle, oxygen lance nozzle
Powder injection hole for it is interior edge ceramics gradual shrinkage spray orifice.The powder injection hole periphery of oxygen lance nozzle be enclosed with 8 the first oxygen runner spray orifices and
12 the second oxygen runner spray orifices, the first oxygen runner spray orifice is parallel with oxygen rifle axis, and the second oxygen runner spray orifice is in 20 ° with oxygen rifle axis
Angle.
Specifically smelting Discrete control process is：
The materials such as molten iron and steel scrap are packed into stove and start to blow, according to slag making in converting process by fusing and heating step
It needing to be blown pulverized limestone, the injection flow of pulverized limestone is 350 ~ 500kg/min,（It is light-burned）Dolomite is added in by fire door, clinker alkali
Degree control is 2.3 ~ 3.0；Top blast oxygen supply intensity is 2.0 ~ 2.5Nm3/ t/min, with N2For carrier gas coal injection, the injection stream of coal dust
It measures as 300 ~ 500kg/min, which is not blown chromite ore fine；In order to accelerate slugging, bottom blowing oxygen supply intensity is 0.8 ~ 1.0Nm3/t/
min；The target of the step is to improve bath temperature to 1560 ~ 1600 DEG C.
Chrome ore melting and reducing step, in order to maintain basicity of slag, is blown pulverized limestone on a small quantity；Top blast oxygen supply intensity for 2.5 ~
3.0Nm3/ t/min, with CO2Chromite ore fine and coal dust are blown for carrier gas, the wherein injection flow of chromite ore fine is 1000 ~ 1200kg/
Min, the injection flow of coal dust is 500 ~ 600kg/min, is operated using high rifle position, improves post-combustion rate, maintains bath temperature；
In order to strengthen melting bath stirring, accelerate chromite ore fine dissolving and reduction, bottom blowing oxygen supply intensity is 1.0 ~ 1.2Nm3/t/min。
Final reduction step stops top blast oxygen supply and dusts, bottom blowing CO2With the gaseous mixture of oxygen, CO2The ratio that is mixed into be
20 ~ 30%, increase bottom blowing intensity to 1.2 ~ 1.5Nm3/ t/min enhances melting bath stirring, promotes in slag（Cr2O3）Final reduction,
It improves（Cr2O3）Recovery rate.
Result of implementation shows：180 tons of chrome ore melting and reducing converters are dusted the work of smelting stainless steel mother liquid using top blow oxygen lance
After skill, the duration of heat shortens 4min, and the recovery rate of chromite ore fine improves 1%, and slag material consumption reduces by 18%, and ton steel cost reduces by 13
Member.
【Embodiment three】As shown in Figs. 1-2, a kind of device for the smelting stainless steel mother liquid that dusted using top blow oxygen lance, including：
Top blow oxygen lance 1, first furnace 2, the first duff pipe 3, coal dust storage tank 4, pulverized limestone storage tank 5, chromite ore fine storage tank 6, the top blow oxygen lance 1
End is arranged in the just furnace 2, and first duff pipe 3 is connected with the top blow oxygen lance 1, the coal dust storage tank 4, lime
Powder storage tank 5, chromite ore fine storage tank 6 are connected with first duff pipe 3, and the top blow oxygen lance 1 includes：It is second duff pipe 11, defeated
Oxygen pipe 12, water inlet pipe 13, return pipe 14 and oxygen lance nozzle 15, second duff pipe 11 are arranged at 1 center of top blow oxygen lance,
Described second duff pipe, 11 one end is connected with the oxygen lance nozzle 15,11 other end of the second duff pipe and the described first defeated powder
Pipe 3 connects, and second duff pipe, 11 periphery one week is oxygen cathete 12, setting water inlet pipe 13 and return pipe outside the oxygen cathete 12
14, for cooling down top blow oxygen lance 1, the oxygen lance nozzle 15 is provided centrally with powder injection hole 151 for the water inlet pipe 13 and return pipe 14,
The powder injection hole 151 is connected with second duff pipe 11, is additionally provided with and multiple is connected with oxygen cathete 12 on the oxygen lance nozzle 15
The first oxygen runner spray orifice 152 and the second oxygen runner spray orifice 153, the first oxygen runner spray orifice 152 and second oxygen runner
The annular centered on the axis of oxygen lance nozzle 15 of spray orifice 153 is set, the first oxygen runner spray orifice 152 and the oxygen lance nozzle 15
Axis it is parallel, the axis of the second oxygen runner spray orifice 153 and the oxygen lance nozzle 15 is in 18-25 ° of angle.
Powder injection hole is gradual shrinkage spray orifice, to improve the spouting velocity of pulvis, the axis and powder injection hole of the first oxygen runner spray orifice
Axis is parallel, and powder air-flow 8 and combustion-supporting oxygen stream 9 are as shown in Figure 1, mixed combustion beneficial to oxygen and coal dust, the second oxygen runner spray orifice
It is designed using large angle, secondary burning oxygen stream 10 is as shown in Figure 1, to meet the needs of furnace gas second-time burning.The top blow oxygen lance
The second duff pipe Ceramics composite steel tube or antifriction alloy steel pipe, the powder injection hole of oxygen lance nozzle is using interior edge is ceramic or interior plating
The processing mode of ceramics.
It is described that mixed powder of the pulvis in stove for chromite ore fine, coal dust and pulverized limestone, wherein chrome ore are sprayed by top blow oxygen lance
Powder provides the required chromium of smelting stainless steel mother liquid, and coal dust is used for slag making and maintenance as fuel and reducing agent, pulverized limestone
Basicity of slag, the mixing of pulvis can select premix mode or non-premix mode.
【Example IV】The present embodiment is essentially identical with above-described embodiment, only difference is that, the coal dust storage tank
4th, pulverized limestone storage tank 5, chromite ore fine storage tank 6 are connected with 7 one end of a premix material spray tank, and the premix material spray tank 7 is another
One end connects first duff pipe 3.
The beneficial effects of the present invention are compared with traditional chrome ore smelting reduction process, the scope of application is wider, reaction efficiency
Higher, suitable for 50 ~ 350 first furnace of stainless steel, the duration of heat shortens more than 3min, and chrome ore recovery rate improves more than 1.0%,
Slag making materials consumption reduces by more than 10%, and ton steel cost reduces by 10 yuan or more.
Claims (4)
1. a kind of method for making steel for the smelting stainless steel mother liquid that dusted using top blow oxygen lance, which is characterized in that the method uses one
Branch top blow oxygen lance, converting process takes control by stages mode, using duff pipe with CO2Or N2It is for carrier gas that smelting stainless steel is female
The required pulvis of liquid sprays at a high speed bath, is sprayed respectively into stove using the first oxygen runner spray orifice and the second oxygen runner spray orifice
Blow O2, wherein the O of the first oxygen runner spray orifice injection2For the burning of coal dust, oxygen and coal dust burn to form height in pulvis exit
Warm fire flame, pulvis are drastically heated and generate heat and crush, and pulvis are promoted to dissolve and reduce in clinker, the second oxygen runner spray orifice
The O of injection2For the second-time burning of furnace gas, predominantly physical-chemical reaction provides heat in molten bath heating and stove, reduces coal dust
With the consumption of oxygen；
It concretely comprises the following steps：
Step 1：Molten iron and steel scrap material are packed into stove, with N in converting process by melting sources and heating2Or CO2It is sprayed for carrier gas
Pulverized limestone and coal dust are blown, the injection flow of pulverized limestone is 100 ~ 600kg/min, and the injection flow of coal dust is 80 ~ 600kg/min,
It is 2.3 ~ 3.0 to control basicity of slag, and molten bath [C] content is maintained to be basically unchanged, and top blow oxygen lance is operated using high rifle position, is improved secondary
Combustion rate is rapidly heated, and top blast oxygen supply intensity is 2.0 ~ 2.5Nm3/ t/min, bottom blowing/side-blown oxygen supply intensity are 0.5 ~ 1.0Nm3/
T/min improves bath temperature to 1540 ~ 1600 DEG C；
Step 2：Chrome ore melting and reducing, with N in converting process2Or CO2Chromite ore fine and coal dust, chromite ore fine are blown for carrier gas big flow
Injection flow for 300 ~ 1500kg/min, the injection flow of coal dust is 100 ~ 800kg/min, needs appropriate injection according to slag making
Pulverized limestone, the injection flow of pulverized limestone is 30 ~ 300kg/min, and top blast oxygen supply intensity is 2.5 ~ 3.0Nm3/ t/min, passes through coal dust
Bath temperature is maintained with the combustion heat release of furnace gas, in order to accelerate the dissolving of chromite ore fine and rate of reduction, bottom blowing/side-blown oxygen supply intensity
For 0.8 ~ 1.5Nm3/ t/min strengthens melting bath stirring；
Step 3：Final reduction stops top blast oxygen supply and dusts, the gaseous mixture of bottom blowing/side-blown inert gas and oxygen, indifferent gas
The ratio that is mixed into of body is 0 ~ 50%, reduces CO partial pressures, increases bottom blowing/side-blown intensity to 1.0 ~ 1.5Nm3/ t/min, enhancing molten bath are stirred
It mixes, promotes Cr in slag2O3Final reduction, improve Cr2O3Recovery rate.
2. the method for making steel of the smelting stainless steel mother liquid according to claim 1 that dusted using top blow oxygen lance, which is characterized in that
The method for making steel equipment therefor includes a top blow oxygen lance（1）, the top blow oxygen lance（1）Including the second duff pipe（11）, oxygen therapy
Pipe（12）, water inlet pipe（13）, return pipe（14）And oxygen lance nozzle（15）, second duff pipe（11）It is arranged at the top blowing oxygen
Rifle（1）Center, second duff pipe（11）One end and the oxygen lance nozzle（15）Connection, second duff pipe（11）Periphery
One week is oxygen cathete（12）, the oxygen cathete（12）Outer setting water inlet pipe（13）And return pipe（14）, the oxygen lance nozzle（15）
It is provided centrally with powder injection hole（151）, the powder injection hole（151）With second duff pipe（11）Connection, the oxygen lance nozzle
（15）On be additionally provided with multiple and oxygen cathete（12）First oxygen runner spray orifice of connection（152）With the second oxygen runner spray orifice（153）, institute
State the first oxygen runner spray orifice（152）With the second oxygen runner spray orifice（153）With oxygen lance nozzle（15）Axis centered on annular
It sets, the first oxygen runner spray orifice（152）With the oxygen lance nozzle（15）Axis it is parallel, the second oxygen runner spray orifice
（153）With the oxygen lance nozzle（15）Axis be in 18-25 ° of angle；
The top blow oxygen lance（1）The control of blowing uses method for making steel as described in claim 1.
3. the method for making steel of the smelting stainless steel mother liquid according to claim 2 that dusted using top blow oxygen lance, which is characterized in that
Described device further includes：First furnace（2）, the first duff pipe（3）, coal dust storage tank（4）, pulverized limestone storage tank（5）, chromite ore fine storage tank
（6）, first duff pipe（3）With second duff pipe（11）The other end connects, the coal dust storage tank（4）, pulverized limestone storage
Tank（5）, chromite ore fine storage tank（6）With first duff pipe（3）Connection.
4. the method for making steel of the smelting stainless steel mother liquid according to claim 3 that dusted using top blow oxygen lance, which is characterized in that
The coal dust storage tank（4）, pulverized limestone storage tank（5）, chromite ore fine storage tank（6）Material spray tank is premixed with one（7）One end connects, institute
State premix material spray tank（7）The other end connects first duff pipe（3）.
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| CN108893668A (en) * | 2018-08-01 | 2018-11-27 | 中冶东方工程技术有限公司 | The production method of ferritic stainless steel |
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| CN111763794B (en) * | 2020-06-10 | 2021-05-14 | 北京科技大学 | Method for smelting stainless steel by mixed blowing of chromium ore powder and carbon powder in TSR converter |
| CN111748670B (en) * | 2020-06-11 | 2021-07-02 | 北京科技大学 | Method for improving chromium ore reduction by bottom blowing oxygen-lime powder |
| CN111676343B (en) * | 2020-06-12 | 2021-07-09 | 北京科技大学 | Multifunctional oxygen lance system for converter steelmaking and steelmaking method |
| CN112094980B (en) * | 2020-08-18 | 2021-06-01 | 北京科技大学 | System and method for efficient smelting of converter through top-bottom composite powder injection |
| CN113699306B (en) * | 2021-08-25 | 2022-04-12 | 中冶赛迪工程技术股份有限公司 | Composite bottom blowing multielement medium system and method for direct current arc furnace bottom electrode |
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Effective date of registration: 20191119 Address after: 100083 building 6, block g, jianxiangyuan, No.209, Beisihuan Middle Road, Haidian District, Beijing Patentee after: Beijing kamie Rongcheng Energy Technology Co Ltd Address before: 100083 Haidian District, Xueyuan Road, No. 30, Co-patentee before: Hu Shaoyan Patentee before: Zhu Rong Co-patentee before: Dong Kai |