CN107227383B - The suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder - Google Patents
The suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder Download PDFInfo
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- CN107227383B CN107227383B CN201710500088.7A CN201710500088A CN107227383B CN 107227383 B CN107227383 B CN 107227383B CN 201710500088 A CN201710500088 A CN 201710500088A CN 107227383 B CN107227383 B CN 107227383B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
Abstract
The suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder of the present invention, belongs to miberal powder Reduction on Fluidized Bed technical field.Iron Ore Powder and anti-adhesion agent are mixed to get reaction compound by the present invention, and the anti-adhesion agent includes waste plastics；Reaction compound is added in fluidized reaction device, N is passed through at a temperature of 800 900 DEG C2Or inert gas, Iron Ore Powder and anti-adhesion agent are mixed in fluidized reaction device, wrapped up, pre- cracking reaction；Then fluidized reaction device reduction pressure rises to 0.15 0.30MPa, and fluidized reaction device is cooled to 700 750 DEG C, and is filled with reducibility gas and carries out Iron Ore Powder Reduction on Fluidized Bed.Iron Ore Powder of the present invention and anti-adhesion agent are sufficiently mixed in encapsulation reaction intracavitary, anti-adhesion agent is coated on the surface of Iron Ore Powder, anti-adhesion agent forms uniform graphite or adhesion carbon on Iron Ore Powder surface, and iron whiskerses or iron atom can be avoided mutually to link reunion, can suppress Iron Ore Powder and cohere defluidization.
Description
Technical field
The invention belongs to miberal powder Reduction on Fluidized Bed technical field, in particular, is related to a kind of pressurized fluidization reduction of iron ore
The suppressing method of defluidization is cohered during powder.
Background technology
Fluid bed direct-reduction technique is an important breakthrough of field of metallurgy, because fluid bed does not have wanting for gas permeability
Ask, therefore can directly use the Iron Ore Powder that blast furnace, shaft furnace can not be used directly；Fluid bed iron-smelting process saves for ironmaking processes
Environmental protection, rationally provided using domestic low-grade, compositeon-silicon paragenetic and solving the problems, such as in terms of iron ore deposit is in short supply it is new
Smelting approach；Fluid bed direct-reduction technique not only expands the source of iron-smelting raw material, and reduces production cost, improves
The competitiveness of product.It is one of direction that following Iron industry develops directly using the fluid bed ironmaking technology of Iron Ore Powder, and
The key areas that various countries' steel and iron industry competitively researchs and develops at present.Austria, South Korea, Australia, Japan and other countries are through long
The developmental research of time, the new technology and equipment of the ironmaking of a variety of fluid beds are developed, wherein more famous and common are
FINMET techniques, FINEX techniques, DIOS techniques and HIsmelt techniques.
At present, blast furnace ironmaking environmental pollution in China's increasingly aggravates, coking coal resource is increasingly deficient, under iron ore deposit quality
Drop, metallargist, which just makes great efforts to explore, reduces blast furnace ironmaking coke ratio new technology or non-blast furnace ironmaking new technology, and fluid bed is directly also
Former technique is precisely in order to meeting this development trend and being developed.With transformation of the iron ore raw material from lump ore to fine ore, tool
There are directly processing fine ore and the fluid bed iron-smelting process independent of coking coal to be Energy-saving of Metallurgical Industry environmental protection, rationally utilize domestic low product
Position, compositeon-silicon paragenetic and solves the problems, such as iron ore deposit it is in short supply in terms of provide a variety of possibility.
But Iron Ore Powder easily occurs cohering defluidization in high-temperature fluidizedization reduction process, reduces reduction efficiency, hinders stream
Journey continuous operation, this applies most important obstacle as fluidized bed iron making technology commercialization.In order to maintain normal operation, use
Less than 650 DEG C low temperature, high gas velocity, low percent reduction conditional operation, will cause reduction rate and production efficiency less, gas effciency
It is low, the increase of technique overall energy consumption.It is badly in need of cohering the suppressing method of defluidization when developing reduced iron miberal powder, suppresses fluidized reduction mistake
The generation of defluidization, and and then the new and effective ironmaking technology of promotion are cohered in journey.
Many scholars are directed to during fluidized reduction to occur cohering defluidization problem and conducted in-depth research.Guo Zhancheng etc.
Spray or impregnate certain density Mg (NO in (CN 102296139A) Iron Ore Powder surface3) solution, dried through fluid bed reduction tail gas
Afterwards, enter back into fluid bed reduction reactor reaction, fluidizing performance be improved significantly, also do not occur when degree of metalization reaches 90%
Defluidization.Wang Jianjun etc. (CN 101624639A) by additive coke blacking of the granularity less than 1mm or agstone or dolomite dust with
The ratio of Iron Ore Powder mass ratio 2~8% is uniformly mixed with Australiaironore powder, and fluid effect is obviously improved, and degree of metalization carries
It is high by 15~29%.Zhong Yiwei etc. (CN 102925611A) prepares 0.5%~60% additive solution first, then by iron ore
Powder is immersed in additive solution, and additive is adsorbed onto to the surface or hole of Iron Ore Powder using the absorption property of Iron Ore Powder itself
Road, modified Iron Ore Powder is subjected to fluidization the pre-heat treatment, effectively suppresses to cohere defluidization, metal during fluidized reduction
Rate improves 30%~40%.Therefore, how to suppress to cohere defluidization during fluidized reduction is to improve reduction efficiency
It is significant for the new and effective ironmaking technology of promotion, energy-conserving and environment-protective with the key of product quality.
The content of the invention
1. invention technical problems to be solved
The present invention is directed to the deficiency that defluidization has been cohered in Iron Ore Powder fluidizing reduction process in the prior art, there is provided a kind of
The suppressing method of defluidization is cohered during pressurized fluidization reduced iron miberal powder, fluidized reaction dress is added after Iron Ore Powder is mixed with anti-adhesion agent
In putting, Iron Ore Powder and anti-adhesion agent are mixed in fluidized reaction device, wrapped up, pre- cracking reaction, and backward fluidized reaction device
In be filled with reducibility gas carry out Iron Ore Powder Reduction on Fluidized Bed；Anti-adhesion agent is coated on the surface of Iron Ore Powder, and anti-adhesion agent is in Iron Ore Powder table
Face forms uniform graphite or adhesion carbon, and iron whiskerses or iron atom can be avoided mutually to link reunion, suppress Iron Ore Powder
Cohere defluidization；
2. technical scheme
To reach above-mentioned purpose, technical scheme provided by the invention is：
The suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder of the present invention, by Iron Ore Powder and anti-adhesion agent
Reaction compound is mixed to get, the anti-adhesion agent includes waste plastics；Reaction compound is added in fluidized reaction device, in 800-
At a temperature of 900 DEG C N is passed through into fluidized reaction device2Or inert gas, Iron Ore Powder is with anti-adhesion agent in fluidized reaction device
Generation mixing, parcel, pre- cracking reaction；Then fluidized reaction device reduction pressure rises to 0.15-0.30MPa, fluidized reaction dress
Put and be cooled to 700-750 DEG C, and be filled with reducibility gas into fluidized reaction device and carry out Iron Ore Powder Reduction on Fluidized Bed.
Preferably, mix, wrap up, discontinuity advertises N in pre- cracking course of reaction2Or inert gas, and gas flow rate
For 0.3-0.5m/s；Gas flow rate is 0.75-0.85m/s in Iron Ore Powder Reduction on Fluidized Bed course of reaction.
Preferably, anti-adhesion agent accounts for the 8%-12% of reaction compound gross mass, and the waste plastics is non-chlorine molding powder containing energy.
Preferably, the granularity of Iron Ore Powder is 0.8-1.0mm；The granularity of described anti-adhesion agent is 0.18-0.66mm.
Preferably, the fluidized reaction device includes bimetallic tube reaction member, and the bimetallic tube reaction member is included in reaction
Pipe and outer sleeve, reaction inner tube set is loaded on inside outer sleeve, and bottom of the tube is connected with outer sleeve bottom in reaction, should
Fluidized bed sieve plate is provided with reaction inner tube, described reaction inner tube is provided with reaction chamber pan feeding close to one end of fluidized bed sieve plate
Mouthful, the reaction chamber feeding mouth forms encapsulation reaction chamber with fluidized bed sieve plate, and Iron Ore Powder and anti-adhesion agent are wrapped in encapsulation reaction chamber
Cover.
Preferably, reaction chamber feeding mouth is provided with air flow guiding section close to the side of encapsulation reaction chamber, the air flow guiding section
Cross-sectional area be gradually reduced from the bottom to top.
Preferably, side of the reaction chamber feeding mouth away from encapsulation reaction chamber is provided with feeding mouth guide section, and the feeding mouth is led
The cross-sectional area of material section is from top to bottom gradually reduced.
Preferably, air intake branch is provided with the top of described outer sleeve, air inlet is provided with described air intake branch
Flow valve, the charge flow rate valve are used to regulate and control the charge flow rate of air intake branch, overcoat are provided with the top of described outer sleeve
Tube manometer, the overcoat tube manometer are used to monitor the pressure in outer sleeve.
Preferably, reaction compound is added in the reaction inner tube of bimetallic tube reaction member, mixed in inner tube is reacted
The reacted chamber feeding mouth of reaction compound afterwards enters encapsulation reaction chamber, and reaction compound is in N2Or under the blowing of inert gas
Mixing, parcel, pre- cracking reaction occurs in encapsulation reaction intracavitary.
Preferably, described reducing gas contains H2Either CO pure gas or mixed gas, described molding powder bag
Include polyethylene, polypropylene and polystyrene.
3. beneficial effect
Using technical scheme provided by the invention, compared with prior art, have the advantages that：
(1) cohere the suppressing method of defluidization during a kind of pressurized fluidization reduced iron miberal powder of the invention, Iron Ore Powder with it is anti-stick
Agent is added to material blending unit and carries out being uniformly mixed so as to obtain reaction compound, encapsulation reaction intracavitary reaction compound occur mixing,
Reduction on Fluidized Bed reaction occurs under conditions of anti-adhesion agent is coated for parcel, pre- cracking reaction, Iron Ore Powder, and anti-adhesion agent is on Iron Ore Powder surface
Uniform graphite or adhesion carbon are formed, avoids iron whiskerses or iron atom from mutually linking reunion, suppresses Iron Ore Powder and coheres mistake
Stream；
(2) suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder of the invention, reaction unit includes
Bimetallic tube reaction member, heating unit and material blending unit, Iron Ore Powder and anti-adhesion agent are mixed simultaneously in material blending unit
Bimetallic tube reaction member is added, Iron Ore Powder and anti-adhesion agent are sufficiently mixed in encapsulation reaction intracavitary, and anti-adhesion agent is coated on Iron Ore Powder
Surface, anti-adhesion agent form uniform graphite or adhesion carbon on Iron Ore Powder surface, suppress Iron Ore Powder and cohere defluidization；
(3) suppressing method of defluidization, appropriate reaction pressure are cohered during a kind of pressurized fluidization reduced iron miberal powder of the invention
Power causes density of gas phase to increase, and the increase of gas-solid contact area, accelerates gas-solid reaction speed, improves degree of metalization；In addition it is appropriate
Pressure causes gas to the increase of mineral powder granular drag force so that fluid bed endoparticle concentration distribution is more uniform, and is coated on iron ore
The anti-adhesion agent reaction on powder surface produces graphite or adhesion carbon on the surface of Iron Ore Powder, and high pressure promotes graphite or viscous
Attached carbon is uniformly distributed in the surface of Iron Ore Powder, so as to avoid iron whiskerses or iron atom from mutually linking reunion, avoids particle from occurring
Cohere phenomenon.
(4) suppressing method of defluidization, reaction chamber feeding mouth are cohered during a kind of pressurized fluidization reduced iron miberal powder of the invention
The side of encapsulation reaction chamber is provided with air flow guiding section, the cross-sectional area of air flow guiding section is gradually reduced from the bottom to top, gas
Body lead group of people reaction compound encapsulation reaction intracavitary roll, when air-flow and reaction compound rise to reaction chamber feeding mouth when,
In the presence of air flow guiding section, in encapsulation reaction intracavitary convolution disturbance occurs for air-flow, and gas promotes the iron in reaction compound
Miberal powder is mixed with anti-adhesion agent, and further promotes the surface that anti-adhesion agent is coated on Iron Ore Powder；
(5) suppressing method of defluidization, the hole of outer rim stomata are cohered during a kind of pressurized fluidization reduced iron miberal powder of the invention
Footpath is more than inner edge stomata, and the flow velocity of the air-flow at edge is larger, and the air-flow at edge disturbs in air flow guiding section, promotes iron ore
Mixing between powder and anti-adhesion agent so that anti-adhesion agent is coated on the outside of Iron Ore Powder；
(6) suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder of the invention, is set on telescoping mechanism
Fixed mechanism is equipped with, support platform can be fixed and arbitrary height, experiment can stretch telescoping mechanism, and then lifting after terminating
Support platform, support platform drive bimetallic tube reaction member to move upwards, and by bimetallic tube reaction member out of heating furnace burner hearth
Take out, accelerate the cooling procedure of equipment, improve conventional efficient；
(7) suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder of the invention, in high constant temperature section
In 800-900 DEG C, the penetrating gas of discontinuity so that anti-adhesion agent is in the pre- cracking molding powder in high 800-900 DEG C of constant temperature section, acceleration
Reaction generation graphite or adhesion carbon, at the same time anti-adhesion agent decompose caused by graphite or adhesion carbon be uniformly adhered to iron
The surface of miberal powder, not only adhesiving effect is more preferable, and forms uniform adhesive face in Iron Ore Powder, so as to inhibit Iron Ore Powder to fluidize
Defluidization is cohered in reduction process.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the fluidized reaction device of the present invention；
Fig. 2 is the structural representation of the heating unit of the fluidized reaction device of the present invention；
Fig. 3 is the cross-sectional view of the fluidized reaction device of the present invention；
Fig. 4 is the overlooking the structure diagram of the fluidized reaction device of the present invention；
Fig. 5 is the fluidized reaction device overall schematic of the present invention；
Fig. 6 is the diagrammatic cross-section of the fluidized bed sieve plate of the fluidized reaction device of the present invention；
Fig. 7 is the structural representation of the fluidized bed sieve plate of the fluidized reaction device of the present invention；
The scanning electron microscopic picture of Fig. 8 inventive samples.
Label declaration in schematic diagram
100th, bimetallic tube reaction member；110th, inner tube is reacted；111st, charging material chamber；112nd, going out gas branch pipe；113rd, inner tube pressure
Power meter；114th, fluidized bed sieve plate；1141st, outer rim stomata；1142nd, middle stomata；1143rd, inner edge stomata；1144th, centre porosity；
115th, charge door；1151st, observation panel；116th, grate plate is supported；117th, Ceramic Balls；120th, outer sleeve；121st, air intake branch；122、
Charge flow rate valve；123rd, overcoat tube manometer；124th, cooling copper tube；130th, support platform；131st, telescoping mechanism；141st, upper method
It is blue；142nd, lower flange；150th, reaction chamber feeding mouth；151st, feeding mouth guide section；152nd, pan feeding aditus laryngis；153rd, air flow guiding section；
160th, encapsulation reaction chamber；
200th, heating unit；210th, heating furnace body；211st, heating furnace burner hearth；212nd, body of heater top surface；
300th, material blending unit；310th, tank is mixed；320th, agitator.
Embodiment
Accompanying drawing hereafter with reference to the detailed description of the exemplary embodiment of the present invention, the accompanying drawing forms one of description
Point, show the enforceable exemplary embodiment of the present invention as example in the figure.Although these exemplary embodiment quilts
Fully describe in detail to enable those skilled in the art to implement the present invention, it is to be understood that can realize other embodiment and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to embodiments of the invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature, to propose to perform the best mode of the present invention, and it is sufficient so that those skilled in the art
The present invention can be implemented.Therefore, the scope of the invention is only defined by the appended claims.
Hereafter detailed description of the present invention and example embodiment can be more fully understood with reference to accompanying drawing, wherein the present invention
Element and feature are identified by reference.
Embodiment 1
The suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder of the present embodiment, by Iron Ore Powder with it is anti-stick
Agent is mixed to get reaction compound, and the anti-adhesion agent is waste plastics, and molding powder is polyethylene；Reaction compound is added into fluidisation instead
Answer in device, N is passed through into fluidized reaction device at a temperature of 800-900 DEG C2Or inert gas, Iron Ore Powder exist with anti-adhesion agent
Mixing, parcel, pre- cracking reaction occur for fluidized reaction device；Then fluidized reaction device reduction pressure rises to 0.15-
0.30MPa, fluidized reaction device are cooled to 700-750 DEG C, and are filled with reducibility gas into fluidized reaction device and carry out iron ore
Powder Reduction on Fluidized Bed, waste plastics are non-chlorine molding powder containing energy.Detailed is described as follows：
Step 1：Iron Ore Powder mixes with anti-adhesion agent
Iron Ore Powder and anti-adhesion agent are respectively dried, and Iron Ore Powder and anti-adhesion agent are added to the mixing of material blending unit 300
In tank 310, in the presence of agitator 320, Iron Ore Powder is sufficiently mixed to obtain reaction compound with anti-adhesion agent；Wherein：Iron Ore Powder
Granularity be 0.8-1.0mm；The granularity of described anti-adhesion agent is 0.18-0.66mm；Anti-adhesion agent accounts for reaction compound gross mass
8%-12%, i.e. anti-adhesion agent account for the 8%-12% of Iron Ore Powder and anti-adhesion agent gross mass, and this implementation is preferably 8%；The waste plastics
For non-chlorine molding powder containing energy, the molding powder that the present embodiment uses is polyethylene.
Step 2：Coat advance cracking reaction
Reaction compound is added in reaction inner tube 110 by charging material chamber 111, reaction compound expects chamber 111 by charging
Reacted chamber feeding mouth 150 is flowed in encapsulation reaction chamber 160；And it is blown into N into outer sleeve 1202Or inert gas, this
Embodiment is high-purity N2, N2Reaction inner tube 110 is entered by bottom of the outer sleeve 120 through outer sleeve 120, and bimetallic tube is anti-
The encapsulation reaction chamber 160 of unit 100 is answered to push between paramount flat-temperature zone 800-900 DEG C, preferably 850 DEG C；Discontinuity advertises N2Gas,
And gas flow rate is 0.3-0.5m/s, preferably 0.4m/s, reaction time 10min；In encapsulation reaction chamber 160, in gas
Blow lower anti-adhesion agent to be sufficiently mixed with Iron Ore Powder so that anti-adhesion agent is coated on the surface of Iron Ore Powder, and anti-stick under the high temperature conditions
Pre- cracking occurs for the molding powder in agent, and anti-adhesion agent is further coated on the surface of Iron Ore Powder during cracking, is iron ore
Prevent that cohering defluidization provides the foundation in powder reduction process；Wherein described discontinuity advertises N2Gas can be described as：Often blast
40s N2After gas, 20s is stood, stopping blasts N2Gas.
Step 3：Reduction of iron ore fines reacts
High constant temperature section is cooled to 700-750 DEG C, preferably 750 DEG C；Reaction inner tube 110 is forced into 0.15-0.3MPa, preferably
0.15MPa；And reducibility gas is filled with into outer sleeve 120, the reducibility gas of the present embodiment is 70%H2+ 30%N2(body
Product ratio), reducibility gas flow velocity is 0.75-0.85m/s, preferably 0.75m/s in Iron Ore Powder Reduction on Fluidized Bed course of reaction, reproducibility
Gas enters reaction inner tube 110 by bottom of the outer sleeve 120 through outer sleeve 120, and gas heating unit 200 is right during this
Reducibility gas is heated, and effectively the reducibility gas during fluidization reduced iron miberal powder is heated, reproducibility
Gas is continued up and contacted on fluidized bed sieve plate 114 with Iron Ore Powder, concurrently gives birth to reduction reaction, the recovery time is
50min。
Reaction finds that Iron Ore Powder does not have to cohere phenomenon after terminating, and detects reacted sample, wherein sample metal
Rate reaches 83.12%；As shown in figure 8, under elevated pressure conditions, the anti-adhesion agent reaction for being coated on Iron Ore Powder surface produces graphite
Or adhesion carbon, on the surface of Iron Ore Powder, and under high-temperature and high-pressure conditions, anti-adhesion agent forms uniform graphite on Iron Ore Powder surface
Or adhesion carbon, so as to avoid iron whiskerses or iron atom from mutually linking reunion, avoid particle from occurring cohering phenomenon.
Comparative example 1
With embodiment 1, difference is the substance of this comparative example：It is 0 that the pressure of inner tube 110 is reacted in reduction process
(i.e. identical with atmospheric pressure), recovery time 50min, part occur and coheres phenomenon, degree of metalization 80.15%.
Comparative example 2
The substance of this comparative example is with embodiment 1, and the reaction pressure of inner tube 110 is 0.45MPa in reduction process, during reduction
Between 50min, do not cohere phenomenon, degree of metalization 74.80%.
Found by embodiment 1 and comparative example 1,2：Pressure rise, density of gas phase increase are reduced, gas-solid contact area increases
Greatly, accelerate gas-solid reaction speed, improve degree of metalization；Therefore, the degree of metalization of embodiment 1 compared to comparative example 1 improve to
83.12%；But when pressure is further increased to 0.45MPa, degree of metalization reaction is reduced to 74.80%；Inventor hundred thinks
Abstruse, by multiple seminar, inventor thinks that its reason is probably because Fe is contained in pressure rise3C+FeO=4Fe+
CO (g) and C+FeO=Fe+CO (g) reacts to positive direction to be carried out, and prevents reduction of iron ore fines to generate metallic iron, and then cause gold
Belong to rate to decline；Compared to comparative example 1, when pressure is that 0.15MPa does not have to cohere, this is probably because reduction pressure suitably carries
It is high so that gas is to the increase of mineral powder granular drag force so that fluid bed endoparticle concentration distribution is more uniform, and is coated on Iron Ore Powder
The anti-adhesion agent reaction on surface produces graphite or adhesion carbon on the surface of Iron Ore Powder, and high pressure promotes graphite or adhesion
Carbon is uniformly distributed in the surface of Iron Ore Powder, so as to avoid iron whiskerses or iron atom from mutually linking reunion, avoids particle from sticking
Tie phenomenon.
Through retrieval：A kind of method (CN201611086959) of iron ore fluidized reduction ironmaking, it is coated on by coal dust
Iron Ore Powder surface；Fluidized reduction is carried out to the Iron Ore Powder for being coated with coal dust, iron whiskerses can be suppressed to a certain extent
Growth, but its inhibition is limited.By repeatedly investigation, it has been found that its reason is due to that surface is comparatively smooth,
It is difficult to the surface for being effectively coated on Iron Ore Powder, causes to be difficult to effectively to form uniform graphite or adhesion on Iron Ore Powder surface
Carbon, inhibition are limited；In addition, the mixing covered effect of the Iron Ore Powder and anti-adhesion agent under normal temperature is poor so that anti-adhesion agent is difficult to
Effectively, the surface of uniform cladding and Iron Ore Powder, proposed by repeatedly research applicant is creative in high constant temperature section
In 800-900 DEG C, the penetrating gas of discontinuity so that anti-adhesion agent is in the pre- cracking molding powder in high 800-900 DEG C of constant temperature section, acceleration
Reaction generation graphite or adhesion carbon, at the same time in the presence of gas, anti-adhesion agent decompose caused by graphite or adhesion
Carbon is uniformly adhered to the surface of Iron Ore Powder, and not only adhesiving effect is more preferable, and forms uniform adhesive face in Iron Ore Powder, so as to
Inhibit in Iron Ore Powder fluidizing reduction process and cohere defluidization；In addition, reaction chamber feeding mouth 150 and encapsulation reaction chamber 160 are total to
With design, mixing of the anti-adhesion agent on Iron Ore Powder surface, covered effect are further increased, to be formed uniformly on Iron Ore Powder surface
Graphite or adhesion carbon are laid a good foundation, and so as to avoid iron whiskerses or iron atom from mutually linking reunion, avoid iron ore powder particles from going out
Now cohere phenomenon.
With reference to Fig. 1, Fig. 2 and Fig. 5, fluidized reaction device of the invention includes bimetallic tube reaction member 100, heating unit
200 and material blending unit 300；As shown in figure 5, material blending unit 300 is used to mix Iron Ore Powder and anti-adhesion agent, after mixing
Iron Ore Powder and anti-adhesion agent add bimetallic tube reaction member 100；The material blending unit 300 includes mixing tank 310 and agitator
320, Iron Ore Powder and anti-adhesion agent are added to and mixed in tank 310, agitator 320 is opened and is mixed.
The bimetallic tube reaction member 100 of the present embodiment includes reaction inner tube 110, outer sleeve 120 and support platform 130,
The described middle part of support platform 130 offers the through hole being engaged with outer sleeve 120, and it is flat that outer sleeve 120 is fixed on support
The middle part of platform 130；The internal diameter of described outer sleeve 120 is more than the external diameter of reaction inner tube 110, and the reaction inner tube 110 is set in
Inside outer sleeve 120, and react the bottom of inner tube 110 and be connected (as shown in Figure 1) with the bottom of outer sleeve 120, in the reaction
Fluidized bed sieve plate 114 is provided with pipe 110, and the sieve diameter of fluidized bed sieve plate 114 is less than the diameter of Iron Ore Powder, so as to avoid iron
Miberal powder falls into the bottom (as shown in Figure 3) of reaction inner tube 110, and fluidized bed sieve plate 114 is provided with the reaction inner tube 110, described
Reaction inner tube 110 one end of fluidized bed sieve plate 114 is provided with reaction chamber feeding mouth 150, the reaction chamber feeding mouth 150 with
Fluidized bed sieve plate 114 forms encapsulation reaction chamber 160, Iron Ore Powder and anti-adhesion agent and is mixed in encapsulation reaction chamber 160, wrapped up, in advance
Cracking reaction.The top of reaction inner tube 110 is provided with charging material chamber 111, and the top of the charging material chamber 111 is provided with charge door
115, opening charge door 115 can expect to add iron ore powder raw material in chamber 111 to charging.It is provided with the side wall of charging material chamber 111
Inner tube pressure meter 113, the inner tube pressure meter 113 is used to detect charging material chamber 111 and reacts the gas pressure of inner tube 110, and ties
Closing overcoat tube manometer 123 can be with analytical reactions inner tube 110 and the pressure differential of outer sleeve 120.
The reaction chamber feeding mouth 150 of the present embodiment includes feeding mouth guide section 151, pan feeding aditus laryngis 152 and air flow guiding section
153；Feeding mouth guide section 151 is connected by pan feeding aditus laryngis 152 with air flow guiding section 153；Specific description：Reaction chamber feeding mouth
150 are provided with air flow guiding section 153 close to the side of encapsulation reaction chamber 160, the cross-sectional area of the air flow guiding section 153 by it is lower extremely
On be gradually reduced, the shaft section of air flow guiding section 153 is a cancave cambered surface, when by bottom blown gas, gas lead group of people reaction mixing
Material is rolled in the encapsulation reaction chamber 160, when air-flow and reaction compound rise to reaction chamber feeding mouth 150, in air flow guiding
In the presence of section 153, convolution disturbance occurs in encapsulation reaction chamber 160 for air-flow, and gas promotes the iron ore in reaction compound
Powder is mixed with anti-adhesion agent, and further promotes the surface that anti-adhesion agent is coated on Iron Ore Powder, so as to effectively avoid
Iron Ore Powder coheres defluidization in reduction process.
Side of the reaction chamber feeding mouth 150 away from encapsulation reaction chamber 160 is provided with feeding mouth guide section 151, the feeding mouth
The cross-sectional area of guide section 151 is from top to bottom gradually reduced, and the bottom of feeding mouth guide section 151 passes through pan feeding aditus laryngis 152 and air-flow
Diversion section 153 is connected.The shaft section of feeding mouth guide section 151 is inclined-plane, and the angle of the inclined-plane and vertical direction is b, and b is
30-60 °, preferably 45 °；Feeding mouth guide section 151 promotes reaction compound and added in encapsulation reaction chamber 160, and promotes
Gas is mixed and coated in encapsulation reaction chamber 160.
The top of the outer sleeve 120 of the present embodiment is provided with air intake branch 121, and air inlet is provided with air intake branch 121
Flow valve 122, the charge flow rate valve 122 are used to regulate and control the charge flow rate of air intake branch 121, and the top of outer sleeve 120 is set
There is overcoat tube manometer 123, the overcoat tube manometer 123 is used to monitor the pressure in outer sleeve 120.Can be in the bar of pressurization
To the fluidized reduction of Iron Ore Powder under part, defluidization is cohered in reduction process so as to suppress Iron Ore Powder.Charging material chamber 111 is close
Going out gas branch pipe 112 is provided with the side wall at top, reacted gas can be discharged by going out gas branch pipe 112, going out gas branch pipe 112 and pipe
Road is connected, and reacted gas is expelled to safe region.
Heating unit 200 is used to heat bimetallic tube reaction member 100, and heating unit 200 includes heating furnace body 210, should
The heating furnace burner hearth 211 being engaged with outer sleeve 120 is provided with heating furnace body 210, i.e. heating furnace burner hearth 211 is vertical
The tubular structure of setting.Outer sleeve 120 can be installed in heating furnace burner hearth 211, and in heating furnace burner hearth 211 to outer cover
Pipe 120 is heated (as shown in Figure 2), i.e., bimetallic tube reaction member 100 is engaged with heating furnace burner hearth 211, double-deck tube reaction
Unit 100 is arranged in heating furnace burner hearth 211, and heating furnace burner hearth 211 can heat to bimetallic tube reaction member 100.
Telescoping mechanism 131, i.e. telescoping mechanism are provided between the support platform 130 and heating furnace body 210 of the present embodiment
131 tops are connected with the lower surface of support platform 130, and the bottom of telescoping mechanism 131 is connected with body of heater top surface 212, telescoping mechanism 131
It can occur between support platform 130 and body of heater top surface 212 flexible.Telescoping mechanism 131 is used to adjust bimetallic tube reaction member
100 load depth in burner hearth, and fixed mechanism is provided with the telescoping mechanism 131, so as to by support platform 130 fix with
Arbitrary height.In addition, experiment can stretch telescoping mechanism 131, and then lifting support platform 130, the band of support platform 130 after terminating
Dynamic bimetallic tube reaction member 100 moves upwards, and bimetallic tube reaction member 100 is taken out out of heating furnace burner hearth 211, Jin Erjia
The speed cooling procedure of equipment, so as to improving conventional efficient.
More importantly can be by adjusting the height of telescoping mechanism 131, to adjust fluidized bed sieve plate 114 in heating-furnace
Position in thorax 211, heating furnace burner hearth 211 are the tubular structure being vertically arranged, and heating furnace burner hearth 211 has in vertical height
Different temperature fields, the heating furnace burner hearth 211 of the present embodiment includes at least two constant temperature sections, wherein low constant temperature intervals control
To 300-350 DEG C；High constant temperature intervals control is to 800-900 DEG C.By adjusting fluidized bed sieve plate 114 in heating furnace burner hearth 211
Position, different temperatures of the Iron Ore Powder in the temperature field of heating furnace burner hearth 211 can be adjusted, and then Iron Ore Powder can be simulated not
Reduction reaction process under synthermal.After the completion of reaction, can further lifting support platform 130, and bimetallic tube is anti-
Unit 100 is answered by being taken out out of heating furnace burner hearth 211, to accelerate cooling procedure completely, improve conventional efficient.Molding powder is poly- second
Alkene
Embodiment 2
With embodiment 1, difference is the substance of the present embodiment：Encapsulation reaction chamber 160 pushes paramount flat-temperature zone
Between before 800-900 DEG C, the top for reacting inner tube 110 first adds to the reaction compound for including Iron Ore Powder and anti-adhesion agent, and to
He gas is blown into outer sleeve 120, and gas flow rate is 0.3-0.5m/s, preferably 0.3m/s, He gas is passed through outer by outer sleeve 120
The bottom of parts casing pipe 120 enters reaction inner tube 110, and the encapsulation reaction chamber 160 of bimetallic tube reaction member 100 is pushed into low perseverance
300-350 DEG C between warm area, gas, which is led group of people, reacts compound rolling in encapsulation reaction chamber 160, in the effect of air flow guiding section 153
Under, convolution disturbance occurs in encapsulation reaction chamber 160 for air-flow, and He gas carries out discontinuity air blowing, avoids anti-adhesion agent and Iron Ore Powder point
Layer, promote anti-adhesion agent to be coated on the surface of Iron Ore Powder, 3-5min, preferably 4min are kept in low 300-350 DEG C of constant temperature section；Afterwards will
Encapsulation reaction chamber 160 pushes between paramount flat-temperature zone 800-900 DEG C, and it is 0.15MPa to react the pressure of inner tube 110 in reduction process, also
Former time 50min, phenomenon is not cohered, degree of metalization 90.18%, subsequent step is the same as embodiment 1.Low constant temperature section 300-
350 DEG C of course of reaction, promote Iron Ore Powder and mix and coat with anti-adhesion agent, be coated on Iron Ore Powder surface under elevated pressure conditions
Anti-adhesion agent reaction produce produce graphite or adhesion carbon in the surface of Iron Ore Powder, reduction process anti-adhesion agent in Iron Ore Powder surface shape
Into uniform graphite or adhesion carbon, so as to avoid iron whiskerses or iron atom from mutually linking reunion, particle is avoided to occur cohering now
As.Molding powder includes polyethylene, polypropylene and polystyrene, and the mass ratio of polyethylene, polypropylene and polystyrene is 2:1:
1。
Embodiment 3
The substance of this comparative example is with embodiment 1, and the reaction pressure of inner tube 110 is 0.3MPa in reduction process, during reduction
Between 50min, do not cohere phenomenon, degree of metalization 83.21%.Anti-adhesion agent is formed uniformly on Iron Ore Powder surface in reduction process
Graphite or adhesion carbon, so as to avoid iron whiskerses or iron atom from mutually linking reunion, avoid particle from occurring cohering phenomenon.
Embodiment 3
It is 0.2MPa that the substance of this comparative example reacts the pressure of inner tube 110 with embodiment 1, in reduction process, and also Primordial Qi
Body contains CO mixed gas, and mixed gas is middle 70%CO+30%N2, described recovery time 40min, do not cohere existing
As degree of metalization 83.05%.
Anti-adhesion agent includes molding powder, silicon nitride powder and alumina powder；The mass percent of anti-adhesion agent each component is：Plastics
Powder：90%th, silicon nitride powder：8%th, alumina powder：2%, silicon nitride powder, alumina powder under the high temperature conditions, in Iron Ore Powder
Surface forms resistant to elevated temperatures sticking point, and silicon nitride powder, the graphite of alumina powder and molding powder formation or adhesion carbon are total to
Same-action, so as to avoid iron whiskerses or iron atom from mutually linking reunion, particle is avoided to occur cohering phenomenon.Molding powder is poly- second
Any of alkene, polypropylene, polystyrene, polyformaldehyde, polyamide, makrolon, polymethyl methacrylate, polyester or
A variety of mixtures.Molding powder in the present embodiment is polypropylene, polystyrene, polyformaldehyde, polyamide, makrolon；Poly- third
Alkene, polystyrene, polyformaldehyde, polyamide, the mass ratio of makrolon are：2:2:1:2:1.
Embodiment 4
The substance of the present embodiment is with embodiment 1, its difference：The bottom of reaction inner tube 110 is provided with net
The support grate plate 116 of shape, Ceramic Balls 117 is equipped with the support grate plate 116, described Ceramic Balls 117 are arranged to 3-5 layers (such as
Shown in Fig. 3), preferably 3 layers, after gas flows through multi-layer ceramics ball 117, Ceramic Balls 117 may be such that air-flow is uniformly distributed in reaction
In pipe 110.
As shown in Figure 6 and Figure 7, fluidized bed sieve plate 114 includes outer rim stomata 1141, middle stomata 1142, inner edge stomata
1143 and centre porosity 1144；Inner edge stomata 1143, middle stomata 1142 and outer rim stomata 1141 Circle-Array successively from inside to outside
It is listed in the outside of centre porosity 1144；The aperture of outer rim stomata 1141 is more than inner edge stomata 1143, middle stomata 1142 and central gas
The aperture in hole 1144；Ceramic Balls 117 first cause air-flow to be uniformly distributed in reaction inner tube 110, then the hole of outer rim stomata 1141
Footpath is larger so that the flow velocity of the air-flow at edge is larger, and the air-flow at edge disturbs in air flow guiding section 153, promotes iron ore
Mixing between powder and anti-adhesion agent so that anti-adhesion agent is coated on the outside of Iron Ore Powder.In addition, inner edge stomata 1143 is obliquely installed,
I.e. inner edge stomata 1143 is obliquely installed to outer rim stomata 1141 from the bottom to top along vertical direction；The axis of inner edge stomata 1143 with
The angle of vertical direction is a, a：20-30 °, preferably 25 °；Inner edge stomata 1143, which is obliquely installed, further promotes disturbing for gas
It is dynamic so that Iron Ore Powder is sufficiently mixed with anti-adhesion agent, and under conditions of high temperature so that anti-adhesion agent is sufficiently uniformly coated on iron
The surface of miberal powder, forms uniform, stable absorption carbon for subsequently on Iron Ore Powder surface and graphite provides basis, so as to inhibit iron
Miberal powder coheres defluidization during reduction.
Being added by the top of reaction inner tube 110 includes the reaction compound of Iron Ore Powder and anti-adhesion agent, and to outer sleeve 120
In be blown into N2Or inert gas, N2Or inert gas is entered in reaction by bottom of the outer sleeve 120 through outer sleeve 120
Pipe 110, and the encapsulation reaction chamber 160 of bimetallic tube reaction member 100 is pushed into low 300-350 DEG C of constant temperature section, gas is led group of people
React compound to roll in encapsulation reaction chamber 160, in the presence of air flow guiding section 153, air-flow is in encapsulation reaction chamber 160
Generation convolution disturbance, N2Or inert gas carries out discontinuity air blowing, avoid anti-adhesion agent from being layered with Iron Ore Powder, promote anti-adhesion agent bag
Overlay on the surface of Iron Ore Powder；Encapsulation reaction chamber 160 is then pushed between paramount flat-temperature zone 800-900 DEG C, continues N2Or inertia
Gas carries out discontinuity air blowing, and controls low gas velocity, and pre- cracking occurs for the molding powder in anti-adhesion agent under the high temperature conditions, is cracking
During anti-adhesion agent be further coated on the surface of Iron Ore Powder, to prevent that cohering defluidization provides during reduction of iron ore fines
Basis.Then high constant temperature section is cooled to 700-750 DEG C, and reaction inner tube 110 is forced into 0.15MPa, and into outer sleeve 120
Reducibility gas is filled with, reducibility gas enters reaction inner tube 110, this mistake by bottom of the outer sleeve 120 through outer sleeve 120
Gas heating unit 200 heats to reducibility gas (such as coal gas, CO etc.) in journey, effectively to fluidization reduction of iron ore
Reducibility gas during powder is heated, reducibility gas continue up and on fluidized bed sieve plate 114 with iron ore
Powder contact, concurrently give birth to reduction reaction, be coated under elevated pressure conditions Iron Ore Powder surface anti-adhesion agent reaction produce produce graphite or
Person adheres to carbon anti-adhesion agent in the surface of Iron Ore Powder, reduction process and uniform graphite or adhesion carbon is formed on Iron Ore Powder surface,
So as to avoid iron whiskerses or iron atom from mutually linking reunion, particle is avoided to occur cohering phenomenon so that under an increased pressure, to solve
Iron ore powder particles cohere defluidization problem.
Embodiment 5
With embodiment 1, difference is the substance of the present embodiment：The top of charge door 115 is provided with transparent sight
Examine mouth 1151, can by the fluidized reduction process of the Iron Ore Powder of 1151 observing response inner tube of observation panel 110, so as to it is more directly perceived,
The accurately fluidized reduction process (as shown in Figure 4) of research Iron Ore Powder.
Cooling copper tube 124 is provided with outer sleeve 120 between support platform 130 and overcoat tube manometer 123, is cooled down
Copper pipe 124 is used to outer sleeve 120 is forced to cool down, and the mainly top of outer sleeve 120 is provided with detection device, if not right
Outer sleeve 120 carries out compulsory water cooling, then the temperature for easily causing outer sleeve 120 is too high and breakage detection device.This implementation
The reaction inner tube 110 of example is not provided with upper flange 141, upper flange 141 and the external stability of reaction inner tube 110 close to the outer of top
Connection, the top of outer sleeve 120 are provided with lower flange 142, and the top of lower flange 142 and outer sleeve 120 is fixedly connected with；Under this
Flange 142 is engaged with upper flange 141, and reaction inner tube 110 inserts outer sleeve 120 by the top of outer sleeve 120, and under use
Flange 142 matches with upper flange 141 is merged into capable sealing, so as to avoid that gas leakage occurs, improves security, and under use
Flange 142 is engaged with upper flange 141, so as to improve the efficiency of assembling (as shown in Figure 3).
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that it can not take off
Various modifications and variations are carried out in the case of from the scope of the present invention being defined by the following claims.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
Fall into the scope of the present invention described here.In addition, background technology is intended to illustrate the Development Status of this technology and meaning,
It is not intended to limit the application field of the present invention or the application and the present invention.
More specifically, although the exemplary embodiment of the present invention has been described herein, but the invention is not limited in
These embodiments, but including those skilled in the art according to above detailed description it can be appreciated that it is modified, omit, example
Such as any and whole embodiments of the combination between each embodiment, adaptive change and/or replacement.Restriction in claim
It can widely be explained according to the language used in claim, and be not limited in foregoing detailed description or implementing to be somebody's turn to do
The example described during application, these examples are considered as nonexcludability.It is in office where to arrange in method or process claims
Any step lifted can in any order perform and be not limited to the order proposed in claim.Therefore, model of the invention
Enclose only to be determined by appended claims and its legal equivalents, rather than by descriptions and examples given above Lai really
It is fixed.
Claims (10)
1. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder, it is characterised in that by Iron Ore Powder with it is anti-stick
Agent is mixed to get reaction compound, and the anti-adhesion agent includes waste plastics；Reaction compound is added in fluidized reaction device,
Into fluidized reaction device, discontinuity advertises N at a temperature of 800-900 DEG C2Or inert gas, Iron Ore Powder are fluidizing with anti-adhesion agent
Mixing, parcel, pre- cracking reaction occur in reaction unit；Then fluidized reaction device reduction pressure rises to 0.15-0.30MPa,
Fluidized reaction device is cooled to 700-750 DEG C, and is filled with reducibility gas into fluidized reaction device and carries out Iron Ore Powder fluidisation also
It is former.
2. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 1, its feature
It is, mixes, wraps up, cracking N in course of reaction in advance2Or the flow velocity of inert gas is 0.3-0.5m/s；Iron Ore Powder fluidisation is also
Gas flow rate is 0.75-0.85m/s in former course of reaction.
3. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 1, its feature
It is, anti-adhesion agent accounts for the 8%-12% of reaction compound gross mass, and the waste plastics is non-chlorine molding powder containing energy.
4. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 1, its feature
It is, the granularity of Iron Ore Powder is 0.8-1.0mm；The granularity of described anti-adhesion agent is 0.18-0.66mm.
5. the suppression side of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim any one of 1-4
Method, it is characterised in that the fluidized reaction device includes bimetallic tube reaction member (100), the bimetallic tube reaction member (100) bag
Reaction inner tube (110) and outer sleeve (120) are included, reaction inner tube (110) is set in outer sleeve (120) inside, and in reaction
Pipe (110) bottom is connected with outer sleeve (120) bottom, and fluidized bed sieve plate (114) is provided with the reaction inner tube (110),
Described reaction inner tube (110) is provided with reaction chamber feeding mouth (150), the reaction chamber close to one end of fluidized bed sieve plate (114)
Feeding mouth (150) forms encapsulation reaction chamber (160) with fluidized bed sieve plate (114), and Iron Ore Powder and anti-adhesion agent are in encapsulation reaction chamber
(160) coated.
6. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 5, its feature
It is, reaction chamber feeding mouth (150) is provided with air flow guiding section (153) close to the side of encapsulation reaction chamber (160), and the air-flow is led
The cross-sectional area of stream section (153) is gradually reduced from the bottom to top.
7. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 5, its feature
It is：Side of the reaction chamber feeding mouth (150) away from encapsulation reaction chamber (160) is provided with feeding mouth guide section (151), the pan feeding
The cross-sectional area of mouth guide section (151) is from top to bottom gradually reduced.
8. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 5, its feature
It is：Air intake branch (121) is provided with the top of described outer sleeve (120), described air intake branch is provided with (121)
Charge flow rate valve (122), the charge flow rate valve (122) are used to regulate and control the charge flow rate of air intake branch (121), described outer cover
Overcoat tube manometer (123) is provided with the top of pipe (120), the overcoat tube manometer (123) is used to monitor outer sleeve (120)
Interior pressure.
9. the suppression side of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim any one of 6-8
Method, it is characterised in that：Compound will be reacted to be added in the reaction inner tube (110) of bimetallic tube reaction member (100), in reaction
The reacted chamber feeding mouth (150) of reaction compound after being mixed in pipe (110) enters encapsulation reaction chamber (160), reacts compound
In N2Or mixing, parcel, pre- cracking reaction occurs under the blowing of inert gas in encapsulation reaction chamber (160).
10. the suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder according to claim 9, its feature
It is：Described reducing gas contains H2Either CO pure gas or mixed gas, described molding powder include polyethylene, gathered
Propylene and polystyrene.
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| CN114410872B (en) * | 2022-01-24 | 2022-12-23 | 安徽工业大学 | Method for inhibiting bonding loss in fluidized reduction process of iron ore powder |
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| US3712807A (en) * | 1970-09-04 | 1973-01-23 | Hydrocarbon Research Inc | Reduction of high purity ores coated with carbonized carbohydrates |
| CN1118173A (en) * | 1993-12-21 | 1996-03-06 | 不来梅钢铁工厂有限公司 | Process for extracting metal from metal ores |
| CN106222350A (en) * | 2016-08-19 | 2016-12-14 | 安徽工业大学 | A kind of coating material suppressing iron ore pellets melting and reducing excessively to cohere and preparation method thereof |
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| US3712807A (en) * | 1970-09-04 | 1973-01-23 | Hydrocarbon Research Inc | Reduction of high purity ores coated with carbonized carbohydrates |
| CN1118173A (en) * | 1993-12-21 | 1996-03-06 | 不来梅钢铁工厂有限公司 | Process for extracting metal from metal ores |
| CN106222350A (en) * | 2016-08-19 | 2016-12-14 | 安徽工业大学 | A kind of coating material suppressing iron ore pellets melting and reducing excessively to cohere and preparation method thereof |
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