CN117604241A - Multi-chamber fluidization roasting device and roasting method based on iron ore regulation and control - Google Patents
Multi-chamber fluidization roasting device and roasting method based on iron ore regulation and control Download PDFInfo
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- CN117604241A CN117604241A CN202311665557.2A CN202311665557A CN117604241A CN 117604241 A CN117604241 A CN 117604241A CN 202311665557 A CN202311665557 A CN 202311665557A CN 117604241 A CN117604241 A CN 117604241A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 70
- 238000005243 fluidization Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 24
- 238000006722 reduction reaction Methods 0.000 claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000005485 electric heating Methods 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 30
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 17
- 239000011707 mineral Substances 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 76
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 52
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007885 magnetic separation Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000006148 magnetic separator Substances 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000012546 transfer Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
Abstract
The invention provides a multi-chamber fluidization roasting device based on iron ore regulation, wherein a plurality of baffles are alternately and uniformly distributed in the shell, a plurality of reduction reaction chambers and cooling reaction chambers are formed between two adjacent baffles, the reduction reaction chambers are sequentially arranged on the front side of the cooling reaction chambers, a cyclone separator is arranged in the innermost reduction reaction chamber, the outer wall of each reduction reaction chamber or cooling reaction chamber is connected with an electric heating device, an air distribution plate is arranged in each reduction reaction chamber or cooling reaction chamber, the air distribution plate divides the reduction reaction chamber or cooling reaction chamber into an upper mineral powder fluidization region and a bottom gas flow region, and the gas flow region is connected with an air inlet pipe assembly; the casing front side is equipped with the feed inlet, the feed inlet is connected with the inlet pipe, the casing rear side is equipped with the discharge gate, the discharge gate is connected with the discharging pipe, the discharging pipe below is provided with connects the ore deposit groove.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a multi-chamber fluidization roasting device and method based on iron ore regulation and control.
Background
China has iron ore resources which are difficult to utilize and have reserves of more than 200 hundred million tons, such as micro-fine ore, oolitic hematite, limonite, siderite and the like. The iron ore difficult to be utilized in China is mainly characterized by 'lean, fine and impurity'. The lean iron ore has low grade, the average grade is only 34 percent, and the average grade is far lower than 46.6 percent of the average grade in the world. "Fine" is fine of the particle size of the embedded, fine of the crystal, and often requires fine or ultra-fine grinding to achieve sufficient dissociation of the iron species. The impurity is complex in mineral composition, and the iron ore concentrate reaching the standard can be obtained by multi-stage magnetic separation distribution purification. For refractory iron ore resources, the conventional beneficiation technology is difficult to reach ideal technical and economic indexes.
In recent years, a great deal of basic research and engineering practice are carried out by a plurality of iron ore dressing and smelting practitioners, the consensus that refractory iron ore can be efficiently utilized by using a dressing and smelting combined process is achieved, and the refractory iron ore is treated by adopting a reduction magnetization roasting-magnetic separation process, so that a better separation index can be obtained. At present, magnetizing roasting equipment mainly comprises a shaft furnace, a tunnel kiln and a rotary kiln, but the equipment has the problems of low heat and mass transfer efficiency, poor material fluidity and difficult control of roasting conditions, so that the situations of high energy consumption, uneven product quality, serious under-reduction and over-reduction phenomena in production are caused.
The fluidization reactor has the advantages of high reaction rate, sufficient gas-solid contact and high heat and mass transfer efficiency, and is a hot spot for the research of a reduction roasting device. However, the existing fluidization reactor has fewer reaction chambers, inaccurate control of roasting conditions, and easy reoxidation in the mineral cooling process, so that the separation efficiency is greatly reduced. Therefore, research and development of a fluidization roasting device capable of realizing accurate regulation and control of refractory iron ore phases is particularly important.
Disclosure of Invention
According to the technical problems, a multi-chamber fluidization roasting device and a roasting method based on iron ore regulation are provided.
The invention adopts the following technical means:
a multi-chamber fluidization roasting device based on iron ore regulation and control, comprising: the cyclone separator is arranged in the innermost reduction reaction chamber, the outer wall of each reduction reaction chamber or cooling reaction chamber is connected with the electric heating device, the air distribution plate is arranged in each reduction reaction chamber or cooling reaction chamber, and divides the reduction reaction chamber or cooling reaction chamber into an upper mineral powder fluidization area and a bottom gas flow area, and the gas flow area is connected with the air inlet pipe assembly; the casing front side is equipped with the feed inlet, the feed inlet is connected with the inlet pipe, the casing rear side is equipped with the discharge gate, the discharge gate is connected with the discharging pipe, the discharging pipe below is provided with connects the ore deposit groove.
Further, the air inlet pipe assembly comprises an air inlet pipe, an air heater, an air flow valve and a gas mixing tank, one end of the air inlet pipe penetrates through the shell and is connected with the air flow area, the other end of the air inlet pipe is connected with the air outlet of the gas mixing tank, the air inlet of the gas mixing tank is connected with a nitrogen conveying pipeline and a reducing gas conveying pipeline respectively, the air heater is fixedly connected with the air inlet pipe, the air heater is used for heating air in the air inlet pipe, the air flow valve is sleeved on the air inlet pipe, and the air flow valve is used for controlling air flow in the air inlet pipe.
Further, the electric heating device also comprises an electric heating temperature controller, wherein the electric heating temperature controller is connected with the electric heating device in series, and the electric heating temperature controller is used for regulating and controlling the temperature of the electric heating device.
The device according to claim 1-3, further comprising the steps of: s1: crushing the iron ore by using a crusher until the particle size is less than or equal to 0.9mm, and then finely grinding the iron ore by using an ore grinding machine so as to obtain iron ore powder of which the particle size is less than 0.074mm and the part accounts for 60-95% of the total mass;
s2: starting an electric heating device, adjusting the temperature of the electric heating device, and heating the reduction reaction chamber to 400-900 ℃;
s3: reducing gas is heated to 400-900 ℃ by a gas heater and then enters through an air inlet pipe
A reduction chamber, and enters a mineral powder fluidization area through an air distribution plate;
s4, feeding iron ore powder into a feed pipe at a rate of 50-150 kg/h, and enabling the ore powder to enter a reduction reaction chamber through the feed pipe;
s5: the gas speed of the reducing gas is regulated to be 0.1-2 m/s, so that the iron ore powder can form a flowing state after entering a reduction reaction chamber and can undergo a reduction reaction with the gas under the action of high temperature;
s6, adjusting the normal-temperature nitrogen gas speed of the cooling reaction chamber to be 0.1-2 m/S, ensuring that the temperature of discharged materials is less than or equal to 100 ℃, and discharging the cooled materials into a receiving tank from a discharge port above the rear end of the shell in a flowing state;
and S7, finely grinding the iron ore discharged from the discharge hole until the size is smaller than 0.043mm, and carrying out low-intensity magnetic separation on the iron ore at the magnetic field strength of 1000-2000 Oe to obtain an iron concentrate product.
Further, the reducing gas is hydrogen or mixed gas of carbon monoxide and nitrogen, wherein the volume percentage of the nitrogen is more than or equal to 50%.
Further, the number of the reduction reaction chambers is N, and the number of the cooling reaction chambers is at least 2 (N-1), wherein N is more than or equal to 4.
Further, the reducing gas is hydrogen or mixed gas of carbon monoxide and nitrogen, and the volume percentage of the nitrogen is more than or equal to 50%. The gas flow rate of the reducing gas is 0.1-2 m/s, the gas flow rate of the normal-temperature nitrogen in the cooling reaction chamber is 0.1-2 m/s, the ore feeding rate of the iron ore powder is 50-150 kg/h, and the temperature of the iron ore powder during the reduction reaction is 420-800 ℃.
Further, the crusher adopts a jaw crusher or a disc crusher.
Further, the ore mill adopts a ball mill.
Further, the magnetic separator adopts a wet magnetic separator.
Compared with the prior art, the invention has the following advantages:
the fluidization behavior of the materials in the reactor is regulated and controlled by controlling the number of the reduction chambers, the concentration, the temperature and the gas speed of the reduction gas, so that the iron ore is promoted to be converted into magnetite; the aim of rapid cooling of the magnetic iron mineral is achieved by controlling the number of cooling reaction chambers and the gas speed of normal-temperature nitrogen, so that the defect that the high-temperature magnetic mineral is oxidized into weak magnetic mineral again after being discharged out of the reactor in the traditional method is avoided; the method has the advantages of high heat and mass transfer efficiency in the reduction process, accurate control of the atmosphere environment in the cooling process, and capability of greatly improving the production efficiency and reducing the energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a multi-chamber fluidization roasting apparatus and a roasting method based on iron ore regulation and control.
FIG. 2 is a schematic diagram of a roasting flow of a multi-chamber fluidization roasting apparatus and roasting method based on iron ore regulation and control according to the present invention.
In the figure: 1. a housing; 2. a baffle; 3. a reduction reaction chamber; 4. cooling the reaction chamber; 5. a cyclone separator; 6. an electric heating device; 7. an electric heating temperature controller; 8. a discharge pipe; 9. a mineral receiving tank; 10. a gas flow valve; 11. a gas mixing tank; 12. an air inlet pipe; 13. a gas heater; 14. a wind distribution plate; 15. a gas flow region; 16. a nitrogen gas delivery line; 17. a reducing gas delivery line; 18. and (5) feeding a pipe.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1-2, the invention provides a multi-chamber fluidization roasting device based on iron ore regulation, which comprises: the device comprises a shell 1, a feeding pipe 18, a cyclone separator 5, an electric heating device 6, an electric heating temperature controller 7, a discharging pipe 8, a mineral receiving tank 9, a gas mixing tank 11, an air inlet pipe assembly and an air distribution plate 14, wherein a plurality of baffles 2 are uniformly distributed up and down in the shell 1 in an alternating mode, a plurality of reduction reaction chambers 3 and cooling reaction chambers 4 are formed between two adjacent baffles 2, the reduction reaction chambers 3 are sequentially arranged on the front side of the cooling reaction chambers 4, the cyclone separator 5 is arranged in the innermost reduction reaction chamber 3, the cyclone separator 5 is used for extracting redundant reduction gas from the shell 1, the extracted reduction gas can be ignited to be discharged to the atmosphere in the form of CO2 and H2O, and other parts needing to be heated in the whole roasting device can be ignited to provide heat.
The outer wall of each reduction reaction chamber 3 or cooling reaction chamber 4 is connected with an electric heating device 6, an air distribution plate 14 is arranged in each reduction reaction chamber 3 or cooling reaction chamber 4, the air distribution plate 14 divides the reduction reaction chamber 3 or cooling reaction chamber 4 into an upper mineral powder fluidization area and a bottom gas flow area 15, the aperture of the air distribution plate 14 is 0.1-1 mm, and the aperture ratio is 2-10%. The air distribution plate 14 can change the direction, speed and range of air supply by adjusting the opening and closing degree or direction of the holes, so as to realize the adjustment and distribution of air flow direction.
The gas flow area 15 is connected with the gas inlet pipe assembly; the front side of the shell 1 is provided with a feed inlet, the feed inlet is connected with a feed pipe 18, the rear side of the shell 1 is provided with a discharge outlet, the discharge outlet is connected with a discharge pipe 8, and a mineral receiving tank 9 is arranged below the discharge pipe 8.
The air inlet pipe assembly comprises an air inlet pipe 12, an air heater 13, an air flow valve 10 and a gas mixing tank 11, one end of the air inlet pipe 12 penetrates through the shell 1 and is connected with an air flowing area 15, the other end of the air inlet pipe 12 is connected with an air outlet of the gas mixing tank 11, an air inlet of the gas mixing tank 11 is respectively connected with a nitrogen conveying pipeline 16 and a reducing gas conveying pipeline 17, the effect of the gas mixing tank 11 is that nitrogen and reducing gas are uniformly mixed before entering the shell 1, the air heater 13 is fixedly connected with the air inlet pipe 12, the air heater 13 is used for heating air in the air inlet pipe 12, the air flow valve 10 is sleeved on the air inlet pipe 12, and the air flow valve 10 is used for controlling air flow in the air inlet pipe 12.
The electric heating device also comprises an electric heating temperature controller 13, wherein the electric heating temperature controller 13 is connected with the electric heating device 6 in series, and the electric heating temperature controller 13 is used for regulating and controlling the temperature of the electric heating device 6.
A device according to claims 1-3, comprising the steps of: s1: crushing the iron ore by using a crusher until the particle size is less than or equal to 0.9mm, and then finely grinding the iron ore by using an ore grinding machine so as to obtain iron ore powder of which the particle size is less than 0.074mm and the part accounts for 60% -95% of the total mass;
s2: starting an electric heating device 6 and adjusting the temperature of the electric heating device to heat the reduction reaction chamber 3 to 400-900 ℃;
s3: reducing gas is heated to 400-900 ℃ through a gas heater 13, then enters a reduction reaction chamber 3 through an air inlet pipe 12, and enters a mineral powder fluidization area through an air distribution plate 14;
s4: feeding iron ore powder into a feed pipe 18 at the speed of 50-150 kg/h, and enabling the ore powder to enter a reduction reaction chamber 3 through the feed pipe 18;
s5: the gas speed of the reducing gas is regulated to be 0.1-2 m/s, so that the iron ore powder can form a flowing state after entering the reduction reaction chamber 3 and is subjected to reduction reaction with the gas under the action of high temperature;
s6: along with the reduction reaction, mineral powder enters a cooling reaction chamber 4 in a flowing state, the normal-temperature nitrogen gas speed of the cooling reaction chamber 4 is adjusted to be 0.1-2 m/s, the temperature of discharged materials is ensured to be less than or equal to 100 ℃, and the cooled materials are discharged into a mineral receiving groove 9 from a discharge hole above the rear end of the shell 1 in the flowing state;
s7: and (3) finely grinding the iron ore discharged from the discharge port until the size is smaller than 0.043mm, and carrying out low-intensity magnetic separation on the iron ore at the magnetic field strength of 1000-2000 Oe to obtain an iron concentrate product.
The reducing gas is hydrogen or mixed gas of carbon monoxide and nitrogen, wherein the volume percentage of the nitrogen is more than or equal to 50%.
The number of the reduction reaction chambers is 4, and the number of the cooling reaction chambers 4 is 6. The reducing gas is hydrogen or mixed gas of carbon monoxide and nitrogen, and the volume percentage of the nitrogen is more than or equal to 50%. The gas flow rate of the reducing gas is 0.1-2 m/s, the gas flow rate of the normal-temperature nitrogen in the cooling reaction chamber 4 is 0.1-2 m/s, the ore feeding rate of the iron ore powder is 50-150 kg/h, and the temperature of the iron ore powder during the reduction reaction is 420-800 ℃.
The crusher adopts a jaw crusher or a disc crusher.
The ore mill adopts a ball mill.
The magnetic separator adopts a wet magnetic separator.
Example 2
As shown in fig. 1-2, the invention also provides a multi-chamber fluidization roasting method based on iron ore regulation (on the basis of embodiment 1), which is different from the embodiment 1 in structure in that:
the number of the baffles 2 is 9, and the space in the shell 1 is equally divided into 10 reaction chambers;
the grade of iron ore powder is 45.56%, wherein the part with granularity smaller than 0.074mm accounts for 85% of the total mass;
the process differs from example 1 in that: the present embodiment employs:
s1, mixing nitrogen and carbon monoxide according to a ratio of 3:2, heating reducing gas to 600 ℃ by a gas heater 13, and then entering a reduction reaction chamber 3 through a gas inlet pipe 12, wherein the gas flow rate of the reduction reaction chamber 3 is 1.2m/S;
s2: the ore feeding rate of the iron ore powder is 80kg/h;
s3: the number of the cooling reaction chambers 4 is 6, the flow rate of nitrogen at normal temperature is 1m/s, and the discharging temperature is 85 ℃;
s4: and (3) finely grinding the roasted product until the grain size is less than 0.043mm and the total mass is 75%, and carrying out low-intensity magnetic separation under the magnetic field intensity of 1000Oe to obtain the iron concentrate with the iron grade TFe of 65.23% and the recovery rate of 87.60%.
Example 3
Unlike the examples, the following are: the number of baffles 2 in the embodiment is 11, and the space in the reactor is equally divided into 12 reaction chambers; the iron ore powder has an iron grade of 50.87%, wherein the part with the granularity smaller than 0.074mm accounts for 70% of the total mass;
the process differs from example 1 in that: the present embodiment employs: mixing nitrogen and carbon monoxide according to the ratio of 7:3, heating reducing gas to 570 ℃ by a gas heater 13, and then entering a reduction reaction chamber 3 through a gas inlet pipe 12, wherein the gas flow rate of the reduction reaction chamber 3 is 2m/s; the ore feeding rate of the iron ore powder is 120kg/h;
the number of the cooling reaction chambers 4 is 8, the flow rate of nitrogen at normal temperature is 1.5m/s, and the discharging temperature is 70 ℃;
and (3) finely grinding the roasted product until the part with the granularity smaller than 0.043mm accounts for 95% of the total mass, and carrying out low-intensity magnetic separation under the magnetic field strength of 1800Oe to obtain the iron concentrate with the iron grade TFe of 66.12% and the recovery rate of 90.01%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A multi-chamber fluidization roasting device based on iron ore regulation and control, which is characterized by comprising: the cyclone separator is arranged in the innermost reduction reaction chamber, the outer wall of each reduction reaction chamber or cooling reaction chamber is connected with the electric heating device, the air distribution plate is arranged in each reduction reaction chamber or cooling reaction chamber, and divides the reduction reaction chamber or cooling reaction chamber into an upper mineral powder fluidization area and a bottom gas flow area, and the gas flow area is connected with the air inlet pipe assembly; the casing front side is equipped with the feed inlet, the feed inlet is connected with the inlet pipe, the casing rear side is equipped with the discharge gate, the discharge gate is connected with the discharging pipe, the discharging pipe below is provided with connects the ore deposit groove.
2. The iron ore regulation-based multi-chamber fluidization roasting device according to claim 1, wherein the air inlet pipe assembly comprises an air inlet pipe, an air heater, an air flow valve and a gas mixing tank, one end of the air inlet pipe penetrates through the shell and is connected with the air flow area, the other end of the air inlet pipe is connected with an air outlet of the gas mixing tank, an air inlet of the gas mixing tank is respectively connected with a nitrogen conveying pipeline and a reducing gas conveying pipeline, the air heater is fixedly connected with the air inlet pipe, the air heater is used for heating air in the air inlet pipe, the air flow valve is sleeved on the air inlet pipe, and the air flow valve is used for controlling air flow in the air inlet pipe.
3. The iron ore regulation-based multi-chamber fluidization roasting apparatus as claimed in claim 1, further comprising an electric heating temperature controller connected in series with the electric heating apparatus, wherein the electric heating temperature controller is used for regulating the temperature of the electric heating apparatus.
4. A multi-chamber fluidization roasting method based on iron ore regulation, characterized by comprising the following steps based on the device of claims 1-3: s1: crushing the iron ore by using a crusher until the particle size is less than or equal to 0.9mm, and then finely grinding the iron ore by using an ore grinding machine so as to obtain iron ore powder of which the particle size is less than 0.074mm and the part accounts for 60-95% of the total mass;
s2: starting an electric heating device, adjusting the temperature of the electric heating device, and heating the reduction reaction chamber to 400-900 ℃;
s3: reducing gas is heated to 400-900 ℃ through a gas heater, then enters a reduction reaction chamber through an air inlet pipe, and enters a mineral powder fluidization area through an air distribution plate;
s4, feeding iron ore powder into a feed pipe at a rate of 50-150 kg/h, and enabling the ore powder to enter a reduction reaction chamber through the feed pipe;
s5: the gas speed of the reducing gas is regulated to be 0.1-2 m/s, so that the iron ore powder can form a flowing state after entering a reduction reaction chamber and can undergo a reduction reaction with the gas under the action of high temperature;
s6, adjusting the normal-temperature nitrogen gas speed of the cooling reaction chamber to be 0.1-2 m/S, ensuring that the temperature of discharged materials is less than or equal to 100 ℃, and discharging the cooled materials into a receiving tank from a discharge port above the rear end of the shell in a flowing state;
and S7, finely grinding the iron ore discharged from the discharge hole until the size is smaller than 0.043mm, and carrying out low-intensity magnetic separation on the iron ore at the magnetic field strength of 1000-2000 Oe to obtain an iron concentrate product.
5. The multi-chamber fluidization roasting method based on iron ore regulation and control as set forth in claim 4, wherein the reducing gas is hydrogen or a mixed gas of carbon monoxide and nitrogen, wherein the volume percentage of nitrogen is not less than 50%.
6. The multi-chamber fluidized roasting method based on iron ore regulation and control according to claim 4, wherein the number of the reduction reaction chambers is N, and the number of the cooling reaction chambers is at least 2 (N-1), wherein N is more than or equal to 4.
7. The multi-chamber fluidization roasting method based on iron ore regulation and control as set forth in claim 4, wherein the reducing gas is hydrogen or a mixed gas of carbon monoxide and nitrogen, and the volume percentage of nitrogen is not less than 50%. The gas flow rate of the reducing gas is 0.1-2 m/s, the gas flow rate of the normal-temperature nitrogen in the cooling reaction chamber is 0.1-2 m/s, the ore feeding rate of the iron ore powder is 50-150 kg/h, and the temperature of the iron ore powder during the reduction reaction is 420-800 ℃.
8. The multi-chamber fluidized roasting method based on iron ore regulation according to claim 4, wherein the crusher adopts a jaw crusher or a disc crusher.
9. The multi-chamber fluidized roasting method based on iron ore regulation and control according to claim 4, wherein the ore mill adopts a ball mill.
10. The multi-chamber fluidized roasting method based on iron ore regulation and control according to claim 4, wherein the magnetic separator is a wet magnetic separator.
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