CN117887956A - Roasting process of thermal cycle type iron ore oxidation-reduction magnetization roasting device - Google Patents
Roasting process of thermal cycle type iron ore oxidation-reduction magnetization roasting device Download PDFInfo
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- CN117887956A CN117887956A CN202211224460.3A CN202211224460A CN117887956A CN 117887956 A CN117887956 A CN 117887956A CN 202211224460 A CN202211224460 A CN 202211224460A CN 117887956 A CN117887956 A CN 117887956A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 323
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 161
- 230000005415 magnetization Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000033116 oxidation-reduction process Effects 0.000 title claims abstract description 17
- 239000000725 suspension Substances 0.000 claims abstract description 287
- 239000002994 raw material Substances 0.000 claims abstract description 111
- 239000007787 solid Substances 0.000 claims abstract description 73
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 18
- 239000002817 coal dust Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims description 84
- 238000002309 gasification Methods 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 21
- 239000003546 flue gas Substances 0.000 claims description 21
- 239000000779 smoke Substances 0.000 claims description 21
- 239000000428 dust Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 20
- 239000003034 coal gas Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 230000000630 rising effect Effects 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000007667 floating Methods 0.000 description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 6
- 229910021646 siderite Inorganic materials 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 5
- 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 4
- 230000005389 magnetism Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 238000007885 magnetic separation Methods 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
A roasting process of a thermal cycle type iron ore oxidation-reduction magnetization roasting device is characterized in that when the temperature in a roasting furnace is heated to 800-805 ℃ by coal dust; starting a lifting machine by a control console, feeding the iron ore raw materials through a feed port, driving the iron ore raw materials to upwards enter a suspension preheater through negative pressure airflow after entering a first suspension preheating pipeline for suspension preheating, entering a roasting furnace after suspension preheating, entering a gas-solid heat exchanger, entering a blanking pipe after oxidation reaction at the temperature of 655 ℃, and gradually falling into a kiln head of a rotary kiln through rotation of the rotary kiln for magnetization reduction roasting; the reducer gas enters a rotary kiln through a gas pipeline to carry out magnetized reduction roasting on the iron ore raw material with the iron ore raw material to obtain magnetized iron ore finished products; the invention is a device for suspension oxidation roasting furnace and rotary kiln reduction roasting, the internal pores of the iron ore raw material for reduction roasting are increased, the reduction magnetization reaction is smooth, the energy consumption is saved, and the production process is improved.
Description
Technical Field
The invention relates to a roasting technology of an iron ore oxidation-reduction magnetization roasting device, in particular to a roasting technology of a thermal cycle iron ore oxidation-reduction magnetization roasting device.
Background
At present, the total amount of iron ore resources in China is rich, the reserve of 220.92 hundred million tons accounts for 1.73 percent of the total reserve in the world, but the iron ore in China has low grade, complex components, weak magnetism and most refractory ore, the average grade of the iron ore is only 33 percent, the iron-rich resource reserve which can be directly connected into a furnace for iron making and steelmaking accounts for only 2.7 percent of the total reserve, the technical difficulty of iron ore exploitation in China is increased, the exploitation cost is increased, the iron ore price in China is not competitive in the world, and the development of the national iron and steel industry is severely restricted.
The existing roasting-magnetization is an important method for realizing high-efficiency separation of iron ore, the reduction process of Fe2O3 in the iron ore follows the gradual transition principle, and the valence of the iron is reduced from high to low: in the reduction process of hematite (Fe 2O 3), feO cannot exist stably when the reduction temperature T is less than 570 ℃, reduction products are Fe3O4 and Fe, and when the reduction temperature is more than 570 ℃, the existing roasting-magnetizing efficient iron ore separation method is easy to generate non-magnetic FeO, so that the follow-up reduction magnetic separation of iron ore at the temperature of less than 570 ℃ is not facilitated; in view of the above, a roasting process of a thermal cycle type iron ore oxidation-reduction magnetization roasting device has been proposed.
Disclosure of Invention
The invention aims to overcome the defect that in the reduction process of the existing hematite (Fe 2O 3) separated by roasting-magnetizing iron ore, when the reduction temperature T is less than 570 ℃, feO cannot exist stably, and when the reduction temperature T is more than 570 ℃, the existing method for efficiently separating the iron ore by roasting-magnetizing is easy to generate non-magnetic FeO, is unfavorable for the subsequent reduction and magnetic separation of the iron ore at the temperature of less than 570 ℃, and provides a roasting process of a thermal cycle type iron ore oxidation-reduction magnetizing roasting device through reasonable design. The suspension oxidizing roasting furnace solid separator is provided with a pulverized coal gasification coil, and fuel gas enters the rotary kiln after pulverized coal gasification; the coal powder gasification is an exothermic reaction, no additional heat source is needed in the rotary kiln, the temperature in the kiln is controlled by controlling the relative proportion of the coal powder amount and the material amount of the roasting furnace, the material temperature in the kiln can be prevented from exceeding 570 ℃, and the magnetism of the reduction products of the iron ore is ensured to the greatest extent;
in order to achieve the above purpose, the invention adopts the following technical scheme: the roasting process of the heat circulation type iron ore oxidation-reduction magnetization roasting device comprises a feed inlet, a lifter, a first suspension preheater, a second suspension preheater, a third suspension preheater, a roasting furnace, a first suspension preheating pipeline, a second suspension preheating pipeline, a third suspension preheating pipeline, a fourth suspension preheating conveying pipeline, a gas-solid separator, a rotary kiln, a kiln tail smoke chamber, a rotary kiln head, a gas-solid heat exchanger, magnetized iron ore, a blower, a mixing chamber, a coal dust conveying pipeline, a coal dust gasification coil pipe, a heat release reactor, a coal gas pipeline, a normal temperature air inlet pipeline, a heat exchange air pipeline, a heat exchange coil group, a high temperature fan, a negative pressure high air pipeline, a dust collector, an exhaust fan, a chimney, a coal feeding port, a blanking pipe and a control console; the method is characterized in that: the feeding end of the rotary kiln is provided with a rotary kiln tail smoke chamber, one side of a feeding hole of the rotary kiln tail smoke chamber is provided with a blanking pipe, a gas-solid separator is arranged above the blanking pipe, a blanking pipeline is arranged between the feeding hole at the upper end of the blanking pipe and the blanking hole at the lower end of the gas-solid separator, and a blanking pipeline is arranged between the lower end of the blanking pipe and the feeding hole of the rotary kiln tail smoke chamber; the feeding pipe is internally provided with a pulverized coal gasification coil, the inlet end of the pulverized coal gasification coil is provided with a mixing chamber, one side of the mixing chamber is provided with a control console, the inlet of the mixing chamber is provided with a blower, the upper end of the mixing chamber is reserved with a pulverized coal feeding port, and the pulverized coal feeding port is internally provided with a pulverized coal conveying pipeline; the discharging end of the rotary kiln is provided with a rotary kiln head, the lower end of the rotary kiln head is provided with a gas-solid heat exchanger, a heat exchange coil group is arranged in the gas-solid heat exchanger, an inlet pipeline of the heat exchange coil group is provided with a normal-temperature air inlet pipeline, the lower end of the gas-solid heat exchanger is reserved with a discharging opening, magnetized iron ore is arranged in the discharging opening, and the magnetized iron ore is provided with uniform granular powdery iron ore raw materials; the outlet end of the pulverized coal gasification coil pipe is provided with a heat-discharging reactor, one side of the kiln head of the rotary kiln is reserved with a gas pipeline, and a gas pipeline is arranged between the gas pipeline and the heat-discharging reactor; the rotary kiln is arranged at an inclined angle that the feeding end is higher than the discharging end, and the middle part of the rotary kiln is arranged as a rotary kiln body;
a roasting furnace is arranged above a kiln tail smoke chamber of the rotary kiln, a coal feeding port is arranged at one side of the bottom of the roasting furnace, a coal feeding valve and a burner are arranged at the inlet of the coal feeding port, a hot air pipeline is reserved at one side of the coal feeding port, and a heat exchange air pipeline is arranged between the hot air pipeline and an outlet of a heat exchange coil group; a material pipeline port is reserved at one side of the lower part of the roasting furnace, a rising negative pressure air flow pipeline is arranged between the lower end of the roasting furnace and the top of a kiln tail smoke chamber of the rotary kiln, a third suspension preheater is arranged above the roasting furnace, and a blanking pipeline is arranged between the material pipeline port at one side of the roasting furnace and a blanking port of the third suspension preheater; a gas-solid separator is arranged on one side above the roasting furnace, and a fourth suspension preheating conveying pipeline is arranged between the top of the roasting furnace and one side of the gas-solid separator;
a first suspension preheater is arranged above the third suspension preheater, a second suspension preheater is arranged on one side between the third suspension preheater and the first suspension preheater, a lifting machine is arranged on one side of the second suspension preheater, a feed inlet is arranged at the lower end of the lifting machine, and a feed inlet is arranged at the upper end of the lifting machine; a second suspension preheating pipeline is arranged between the top of the third suspension preheater and one side of the upper part of the second suspension preheater, and a blanking feeding pipeline is arranged between the middle part of the second suspension preheating pipeline and the blanking port of the first suspension preheater;
a first suspension preheating pipeline is arranged between the top of the second suspension preheater and one side of the upper part of the first suspension preheater, and a blanking feeding pipeline is arranged between the middle part of the first suspension preheating pipeline and a conveying port at the upper end of the lifting machine; a gas-solid separator is arranged below the second suspension preheater, a third suspension preheating pipeline is arranged between the top of the gas-solid separator and one side of the upper part of the third suspension preheater, and a blanking feeding pipeline is arranged between the middle part of the third suspension preheating pipeline and a blanking port of the second suspension preheater; the first suspension preheating pipeline, the second suspension preheating pipeline, the third suspension preheating pipeline, the fourth suspension preheating conveying pipeline and the normal-temperature air inlet pipeline are respectively set to be negative pressure, and the air inlet of the normal-temperature air inlet pipeline is set to be positive pressure; the cavities of the first suspension preheater, the second suspension preheater, the third suspension preheater, the roasting furnace, the gas-solid separator and the rotary kiln are all set to be negative pressure;
a high-temperature fan is arranged at one side of the first suspension preheater, a negative pressure high-air pipeline is arranged between the outlet of the first suspension preheater and the high-temperature fan, a chimney is arranged at one side of the outlet end of the high-temperature fan, and a dust collector and an exhaust fan are sequentially arranged between the high-temperature fan and the chimney; a lifting machine is arranged at one side of the second suspension preheater, and a material conveying pipeline is arranged between the second suspension preheater and a conveying port at the upper end of the lifting machine;
before the iron ore raw material is subjected to oxidation-reduction magnetization processing, heating the roasting furnace by coal dust; the coal feeding valve and the burner of the coal feeding port are opened through the control console, the coal powder continuously enters the roasting furnace through the coal feeding port and is heated and ignited through the burner, the heated and ignited coal powder is rapidly heated in the roasting furnace, and the temperature in the roasting furnace is raised to 800-805 ℃; starting a high-temperature fan and an exhaust fan through a control console, and sucking air at the inlet end of the high-temperature fan after the high-temperature fan and the exhaust fan are started, wherein the sucked air of the high-temperature fan is sucked into normal-temperature air through an air inlet of a normal-temperature air inlet pipeline; the air inlet of the normal temperature air inlet pipeline sucks normal temperature air and sequentially enters the heat exchange coil group, the air pipeline after heat exchange, the roasting furnace, the fourth suspension preheating conveying pipeline, the gas-solid separator, the third suspension preheating pipeline, the third suspension preheater, the second suspension preheating pipeline, the second suspension preheater, the first suspension preheating pipeline, the first suspension preheater, the negative pressure high-air pipeline and the high-temperature fan; when the high-temperature fan sucks air in the negative-pressure high-wind pipeline, the air flow between the negative-pressure high-wind pipeline and the normal-temperature air inlet pipeline is rising negative-pressure air flow, the negative-pressure air flow is discharged into the dust collector through an outlet sucked by the high-temperature fan, and purified air is sucked by the exhaust fan and discharged into a chimney for discharge;
when the rising negative pressure air flow passes through the roasting furnace, the negative pressure air flow is heated to be suspension preheating air flow at 800-805 ℃ in the roasting furnace, the suspension preheating air flow sequentially passes through a fourth suspension preheating conveying pipeline, a gas-solid separator, a third suspension preheating pipeline, a third suspension preheater, a second suspension preheating pipeline, a second suspension preheater, a first suspension preheating pipeline, a first suspension preheater and a negative pressure high air pipeline from bottom to top, when the suspension preheating air flow is discharged into a dust collector through a high temperature fan, the dust collector performs dust removal purification on the suspension preheating air flow to be purified air, and the purified air is sucked by an exhaust fan and discharged into a chimney; the suspension preheating air flow is discharged from the chimney through the negative pressure high wind pipeline.
When the suspension preheating airflow sequentially passes through the suspension preheating pipeline and the suspension preheater to normally run, a control console starts a lifting machine, iron ore raw materials are fed through a feed port, the lifting machine conveys the raw materials to a conveying port at the upper end, the iron ore raw materials enter a first suspension preheating pipeline through a discharging feed pipeline of the conveying port, the temperature of suspension flue gas with 280-287 ℃ after the iron ore raw materials in the first suspension preheating pipeline exchange heat with the suspension preheating airflow is 280 ℃, the iron ore raw materials are driven by negative pressure airflow to upwards enter the first suspension preheater, the temperature of the iron ore raw materials discharged from the first suspension preheater is 210 ℃ after gas-solid separation, and 300 ℃ high-temperature flue gas discharged from the first suspension preheater is discharged through a negative pressure high-wind pipeline; the iron ore raw materials subjected to suspension processing in the first suspension preheater fall to a blanking port at the bottom, the iron ore raw materials enter a second suspension preheating pipeline through a blanking feeding pipeline of the blanking port, and the second suspension preheating pipeline drives the iron ore raw materials to enter the second suspension preheater upwards through negative pressure airflow;
the second suspension preheater carries out suspension processing of preheating, dewatering and pre-decomposing on the iron ore raw material at the temperature of 496-490 ℃, impurities in the iron ore raw material after suspension processing are high-temperature flue gas, and the high-temperature flue gas in the second suspension preheater is discharged into the first suspension preheater through a first suspension preheating pipeline; the iron ore raw materials subjected to suspension processing in the second suspension preheater fall to a blanking port at the bottom, the iron ore raw materials enter a third suspension preheating pipeline through a blanking feeding pipeline of the blanking port, and the third suspension preheating pipeline drives the iron ore raw materials to enter the third suspension preheater upwards through negative pressure airflow;
the third suspension preheater is used for carrying out suspension processing of preheating, dewatering and pre-decomposing on the iron ore raw materials at the temperature of 650-660 ℃, impurities in the iron ore raw materials after suspension processing are high-temperature flue gas, the high-temperature flue gas in the third suspension preheater is discharged into the second suspension preheater through a second suspension preheating pipeline, the iron ore raw materials after suspension processing in the third suspension preheater fall to a feed opening at the bottom, and the iron ore raw materials enter a roasting furnace through a feed pipeline at the feed opening;
the roasting furnace carries out oxidation reaction on the iron ore raw materials at 800-805 ℃, the oxidation reaction is carried out to remove carbon dioxide, moisture and sulfur in the iron ore raw materials, the iron ore raw materials are driven to enter a gas-solid separator by negative pressure air flow of a fourth suspension preheating conveying pipeline after the oxidation reaction, the iron ore raw materials enter a blanking pipe through a blanking port of the gas-solid separator, and enter a gas-solid heat exchanger through a kiln head of a rotary kiln; the temperature of the iron ore raw material subjected to gas-solid separation in the gas-solid separator is 750-760 ℃, the iron ore raw material enters a blanking pipe after oxidation reaction at 655 ℃, the temperature of the iron ore raw material after heat exchange of the coal dust gasification coil by the blanking pipe is 508 ℃, and the iron ore raw material at 508 ℃ enters a rotary kiln and gradually falls into the kiln head of the rotary kiln to be subjected to magnetization reduction roasting by rotating the rotary kiln.
While the iron ore raw material exchanges heat to the coal powder gasification coil pipe through the blanking pipe, coal powder is fed into the coal powder through a coal powder conveying pipeline from a coal feeding port above the mixing chamber, an exhaust port of the air blower corresponds to high-speed air flow in the mixing chamber, the coal powder in the mixing chamber is mixed with the air flow to form mixed coal gas, the mixed coal gas passes through the coal powder gasification coil pipe and has the temperature of 420 ℃ to 430 ℃, the mixed coal gas at the temperature of 420 ℃ to 430 ℃ enters the exothermic gas in the exothermic reactor for gasification, the gas in the gas pipeline has the temperature of 550 ℃ to 558 ℃ and is reducing agent coal gas after heat release, and the reducing agent coal gas enters the rotary kiln through the gas pipeline and is subjected to magnetization reduction roasting with the iron ore raw material; the iron ore raw materials fall into the gas-solid heat exchanger through a discharge port at the lower end after magnetized reduction roasting at 550-558 ℃, and the iron ore raw materials are discharged into magnetized iron ore finished products through the discharge port of the gas-solid heat exchanger;
in the process of magnetizing reduction roasting of iron ore raw materials at a high temperature of 550-558 ℃ in the rotary kiln, high temperature of 520 ℃ in a kiln tail smoke chamber of the rotary kiln enters a roasting furnace through a rising negative pressure air flow pipeline at the top to support combustion of coal dust;
the magnetized iron ore of the gas-solid heat exchanger exchanges heat and cools through normal-temperature air flowing in the heat exchange coil group, the air after the flowing air at the outlet of the heat exchange coil group exchanges heat is hot air with the temperature of more than 240 ℃, and the hot air sequentially enters the roasting furnace through an air pipeline after heat exchange to support combustion of coal dust.
The beneficial effects are that: the iron ore raw material oxidation-reduction magnetization roasting device is a device of a suspension oxidation roasting furnace and a rotary kiln reduction roasting, wherein the suspension roasting method is to firstly perform oxidation roasting on iron ore raw materials containing limonite, hematite and siderite in a roasting furnace, and then perform reduction roasting in the rotary kiln; a pulverized coal gasification coil is arranged in a blanking pipe of a solid separator of the suspension oxidizing roasting furnace, and fuel gas enters a rotary kiln after pulverized coal gasification; the coal powder gasification is an exothermic reaction, no additional heat source is needed in the rotary kiln, the temperature in the kiln is controlled by controlling the relative proportion of the coal powder amount and the material amount of the roasting furnace, the material temperature in the kiln can be prevented from exceeding 570 ℃, and the magnetism of the reduction products of the iron ore is ensured to the greatest extent;
the iron ore oxidation-reduction magnetization roasting device can remove carbon dioxide in siderite and water in limonite through oxidation roasting, reduce heat energy consumption when the carbon dioxide in siderite and crystal water in limonite are decomposed in a blast furnace, and remove sulfur in iron ore raw materials through oxidation roasting; the flue gas at the outlet of the roasting furnace is used for preheating iron ore raw materials, and hot air can be used as combustion air of the roasting furnace after heat exchange between the materials at the outlet of the rotary kiln and the air. Therefore, the method is an energy-saving and efficient magnetizing roasting process of the iron ore, and improves the production process;
the internal pores of the iron ore raw material after oxidation roasting are increased, so that the subsequent reduction magnetization reaction is carried out more smoothly, and the energy consumption is saved; the flue gas at the outlet of the roasting furnace is used for preheating the iron ore raw materials, and after the heat exchange between the material at the outlet of the rotary kiln and the air, the hot air can be used as combustion air of the roasting furnace, so that the magnetizing roasting process of the iron ore raw materials is energy-saving and efficient.
The invention uses a suspension oxidation-reduction roasting method to carry out magnetization roasting on the iron ore containing limonite, hematite and siderite, and has the following advantages:
(1) The iron ore is subjected to oxidizing roasting and then reduction roasting, and the carbon dioxide in the siderite, the water and the sulfur in the limonite are removed by oxidizing roasting, so that the consumption of heat energy during the decomposition of the carbon dioxide in the siderite and the crystallization water in the limonite in the blast furnace is reduced. The internal pores of the iron ore after the oxidizing roasting are increased, so that the subsequent reduction magnetization reaction is carried out more smoothly, and the energy consumption is saved.
(2) The invention utilizes the heat exchange between the materials from the solid separator and the coal dust, the temperature of the coal gas after the heat exchange is about 600 ℃ to reach the ignition point of the coal dust, the coal dust is completely gasified in the exothermic reactor, and the generated coal gas is introduced into the rotary kiln 8 to reduce iron ore, thereby not only solving the heat source required by the gasification of the coal dust and saving the energy consumption, but also providing the reducing agent for the rotary kiln.
(3) According to the invention, the discharged rotary kiln material exchanges heat with air, and the hot air after heat exchange is used as combustion air for burning the pulverized coal of the roasting furnace, so that the material is cooled and the energy consumption is saved.
(4) According to the invention, the temperature of each node in the system is regulated by controlling the relative proportion of the coal powder amount and the material amount in the roasting furnace, so that the roasting temperature in the rotary kiln 8 is less than 570 ℃, the generation of non-magnetic FeO is reduced, the magnetism of the roasted iron ore is improved, and the follow-up magnetic separation is facilitated.
(5) In the invention, the temperature of the material discharged from the solid separator 7 is about 680 ℃, the temperature of the flue gas discharged from the high-temperature fan is about 300 ℃, and the temperature of the iron ore discharged from the rotary kiln 8 is about 80 ℃.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a general assembly structure;
FIG. 2 is a schematic view of the roasting furnace and suspension preheater of FIG. 1;
FIG. 3 is a schematic view of the rotary kiln and heat exchanger of FIG. 1 and its piping structure;
in fig. 1, 2, 3: the device comprises a feed inlet 1, a lifting machine 2, a first suspension preheater 3, a second suspension preheater 4, a third suspension preheater 5, a roasting furnace 6, a first suspension preheating pipeline 6-1, a second suspension preheating pipeline 6-2, a third suspension preheating pipeline 6-3, a fourth suspension preheating conveying pipeline 6-4, a gas-solid separator 7, a rotary kiln 8, a rotary kiln tail smoke chamber 8-1, a rotary kiln head 8-2, a gas-solid heat exchanger 9, magnetized iron ore 10, a blower 11, a mixing chamber 12, a pulverized coal conveying pipeline 13, a pulverized coal gasification coil 14, a exothermic reactor 15, a gas pipeline 16, a normal temperature air inlet pipeline 17, a heat exchange air pipeline 17-1, a heat exchange coil group 17-2, a high-temperature fan 18, a negative pressure high-wind pipeline 18-1, a dust collector 19, an exhaust fan 20, a chimney 21, a coal feeding inlet 22, a blanking pipe 23 and a control console 24.
Detailed Description
The invention is further described in detail below with reference to examples and embodiments:
example 1
The feeding end of the rotary kiln 8 is provided with a rotary kiln tail smoke chamber 8-1, one side of the feeding port of the rotary kiln tail smoke chamber 8-1 is provided with a blanking pipe 23, a gas-solid separator 7 is arranged above the blanking pipe 23, a blanking pipeline is arranged between the feeding port at the upper end of the blanking pipe 23 and the blanking port at the lower end of the gas-solid separator 7, and a blanking pipeline is arranged between the lower end of the blanking pipe 23 and the feeding port of the rotary kiln tail smoke chamber 8-1; the blanking pipe 23 is internally provided with a pulverized coal gasification coil 14, the inlet end of the pulverized coal gasification coil 14 is provided with a mixing chamber 12, one side of the mixing chamber 12 is provided with a console 24, the inlet of the mixing chamber 12 is provided with a blower 11, the upper end of the mixing chamber 12 is reserved with a pulverized coal feeding port, and the pulverized coal feeding port is internally provided with a pulverized coal conveying pipeline 13; the discharging end of the rotary kiln 8 is arranged as a rotary kiln head 8-2, a gas-solid heat exchanger 9 is arranged at the lower end of the rotary kiln head 8-2, a heat exchange coil group 17-2 is arranged in the gas-solid heat exchanger 9, an inlet pipeline of the heat exchange coil group 17-2 is arranged as a normal temperature air inlet pipeline 17, a discharging opening is reserved at the lower end of the gas-solid heat exchanger 9, magnetized iron ore 10 is arranged in the discharging opening, and the magnetized iron ore 10 is arranged as a uniformly granular powdery iron ore raw material; the outlet end of the pulverized coal gasification coil 14 is provided with a thermal reactor 15, one side of the kiln head 8-2 of the rotary kiln is reserved with a gas pipeline opening, and a gas pipeline 16 is arranged between the gas pipeline opening and the thermal reactor 15; the rotary kiln 8 is arranged at an inclined angle that the feeding end is higher than the discharging end, and the middle part of the rotary kiln 8 is arranged as a rotary kiln body;
a roasting furnace 6 is arranged above the kiln tail smoke chamber 8-1 of the rotary kiln, a coal feeding port 22 is arranged at one side of the bottom of the roasting furnace 6, a coal feeding valve and a burner are arranged at the inlet of the coal feeding port 22, a hot air pipeline port is reserved at one side of the coal feeding port 22, and a heat exchange air pipeline 17-1 is arranged between the hot air pipeline port and the outlet of the heat exchange coil group 17-2; a material pipeline port is reserved at one side of the lower part of the roasting furnace 6, a rising negative pressure air flow pipeline is arranged between the lower end of the roasting furnace 6 and the top of a kiln tail smoke chamber 8-1 of the rotary kiln, a third suspension preheater 5 is arranged above the roasting furnace 6, and a blanking pipeline is arranged between the material pipeline port at one side of the roasting furnace 6 and a blanking port of the third suspension preheater 5; a gas-solid separator 7 is arranged on one side above the roasting furnace 6, and a fourth suspension preheating conveying pipeline 6-4 is arranged between the top of the roasting furnace 6 and one side of the gas-solid separator 7;
a first suspension preheater 3 is arranged above the third suspension preheater 5, a second suspension preheater 4 is arranged on one side between the third suspension preheater 5 and the first suspension preheater 3, a lifting machine 2 is arranged on one side of the second suspension preheater 4, a feed inlet 1 is arranged at the lower end of the lifting machine 2, and a feed conveying inlet is arranged at the upper end of the lifting machine 2; a second suspension preheating pipeline 6-2 is arranged between the top of the third suspension preheater 5 and one side of the upper part of the second suspension preheater 4, and a blanking feeding pipeline is arranged between the middle part of the second suspension preheating pipeline 6-2 and the blanking port of the first suspension preheater 3;
a first suspension preheating pipeline 6-1 is arranged between the top of the second suspension preheater 4 and one side of the upper part of the first suspension preheater 3, and a blanking feeding pipeline is arranged between the middle part of the first suspension preheating pipeline 6-1 and a conveying port at the upper end of the lifting machine 2; a gas-solid separator 7 is arranged below the second suspension preheater 4, a third suspension preheating pipeline 6-3 is arranged between the top of the gas-solid separator 7 and one side of the upper part of the third suspension preheater 5, and a blanking feeding pipeline is arranged between the middle part of the third suspension preheating pipeline 6-3 and a blanking port of the second suspension preheater 4; the first suspension preheating pipeline 6-1, the second suspension preheating pipeline 6-2, the third suspension preheating pipeline 6-3, the fourth suspension preheating conveying pipeline 6-4 and the normal temperature air inlet pipeline 17 are respectively set to be negative pressure, and the air inlet of the normal temperature air inlet pipeline 17 is set to be positive pressure; the cavities of the first suspension preheater 3, the second suspension preheater 4, the third suspension preheater 5, the roasting furnace 6, the gas-solid separator 7 and the rotary kiln 8 are all set to be negative pressure;
a high-temperature fan 18 is arranged on one side of the first suspension preheater 3, a negative pressure high-air pipeline 18-1 is arranged between the outlet of the first suspension preheater 3 and the high-temperature fan 18, a chimney 21 is arranged on one side of the outlet end of the high-temperature fan 18, and a dust collector 19 and an exhaust fan 20 are sequentially arranged between the high-temperature fan 18 and the chimney 21; one side of the second suspension preheater 4 is provided with a lifting machine 2, and a material conveying pipeline is arranged between the second suspension preheater 4 and a conveying port at the upper end of the lifting machine 2;
before the iron ore raw material is subjected to oxidation-reduction magnetization processing, the roasting furnace 6 is heated by coal dust; the coal feeding valve and the burner of the coal feeding port 22 are opened through the control console 24, the coal powder continuously enters the roasting furnace 6 through the coal feeding port 22 and is heated and ignited through the burner, the heated and ignited coal powder rapidly rises in the roasting furnace 6, and the temperature in the roasting furnace 6 rises to 800-805 ℃; starting the high-temperature fan 18 and the exhaust fan 20 through the console 24, and sucking air at the inlet end of the high-temperature fan 18 after the high-temperature fan 18 and the exhaust fan 20 are started, wherein the sucked air of the high-temperature fan 18 is sucked into normal-temperature air through the air inlet of the normal-temperature air inlet pipeline 17; the air inlet of the normal temperature air inlet pipeline 17 is used for sucking normal temperature air and sequentially enters the heat exchange coil group 17-2, the heat exchange air pipeline 17-1, the roasting furnace 6, the floating preheating conveying pipeline 6-4, the gas-solid separator 7, the third floating preheating pipeline 6-3, the third floating preheater 5, the second floating preheating pipeline 6-2, the second floating preheater 4, the first floating preheating pipeline 6-1, the first floating preheater 3, the negative pressure high air pipeline 18-1 and the high temperature fan 18; when the high-temperature fan 18 sucks air in the negative-pressure high-air pipeline 18-1, the air flow between the negative-pressure high-air pipeline 18-1 and the normal-temperature air inlet pipeline 17 is rising negative-pressure air flow, the negative-pressure air flow is discharged into the dust collector 19 through an outlet sucked by the high-temperature fan 18, and the purified air is sucked by the exhaust fan 20 and discharged into the chimney 21 for discharge;
when the rising negative pressure air flow passes through the roasting furnace 6, the negative pressure air flow is heated to be suspension preheating air flow at 800-805 ℃ in the roasting furnace 6, the suspension preheating air flow sequentially passes through the suspension preheating conveying pipeline 6-4, the gas-solid separator 7, the third suspension preheating pipeline 6-3, the third suspension preheater 5, the second suspension preheating pipeline 6-2, the second suspension preheater 4, the first suspension preheating pipeline 6-1, the first suspension preheater 3 and the negative pressure high-wind pipeline 18-1 from bottom to top, when the suspension preheating air flow is discharged into the dust collector 19 through the high-temperature fan 18, the dust collector 19 performs dust removal purification on the suspension preheating air flow to be purified air, and the exhaust fan 20 sucks the purified air and discharges the purified air into the chimney 21 for discharging; the suspended pre-heat air stream is discharged from the stack 21 through the negative pressure high wind conduit 18-1.
Example 2
When the suspension preheating airflow sequentially passes through the suspension preheating pipeline and the suspension preheater to normally run, the control console 24 starts the lifting machine 2, the iron ore raw material is fed through the feed inlet 1, the lifting machine 2 conveys the raw material to the conveying port at the upper end, the iron ore raw material enters the first suspension preheating pipeline 6-1 through the blanking feed pipeline of the conveying port, the temperature of the suspension flue gas with 280-287 ℃ after the iron ore raw material in the first suspension preheating pipeline 6-1 exchanges heat with the suspension preheating airflow is 280-287 ℃, the negative pressure airflow drives the iron ore raw material to upwards enter the first suspension preheater 3, the temperature of the iron ore raw material discharged out of the first suspension preheater 3 is 210 ℃, and the 300 ℃ high temperature flue gas discharged out of the first suspension preheater 3 is discharged through the negative pressure high air pipeline 18-1; the iron ore raw materials subjected to suspension processing in the first suspension preheater 3 fall to a blanking port at the bottom, the iron ore raw materials enter a second suspension preheating pipeline 6-2 through a blanking feeding pipeline of the blanking port, and the second suspension preheating pipeline 6-2 drives the iron ore raw materials to enter the second suspension preheater 4 upwards through negative pressure air flow;
the second suspension preheater 4 carries out suspension processing of preheating, dewatering and pre-decomposing on the iron ore raw material at the temperature of 496-490 ℃, impurities in the iron ore raw material after suspension processing are high-temperature flue gas, and the high-temperature flue gas in the second suspension preheater 4 is discharged into the first suspension preheater 3 through the first suspension preheating pipeline 6-1; the iron ore raw materials subjected to suspension processing in the second suspension preheater 4 fall to a blanking port at the bottom, the iron ore raw materials enter a third suspension preheating pipeline 6-3 through a blanking feeding pipeline of the blanking port, and the third suspension preheating pipeline 6-3 drives the iron ore raw materials to enter the third suspension preheater 5 upwards through negative pressure air flow;
the third suspension preheater 5 carries out suspension processing of preheating, dewatering and pre-decomposing on the iron ore raw materials at the temperature of 650-660 ℃, impurities in the iron ore raw materials after suspension processing are high-temperature flue gas, the high-temperature flue gas in the third suspension preheater 5 is discharged into the second suspension preheater 4 through the second suspension preheating pipeline 6-2, the iron ore raw materials after suspension processing in the third suspension preheater 5 fall to a blanking port at the bottom, and the iron ore raw materials enter the roasting furnace 6 through a blanking feeding pipeline of the blanking port;
the roasting furnace 6 carries out oxidation reaction on the iron ore raw materials at 800-805 ℃, the oxidation reaction is carried out to remove carbon dioxide, moisture and sulfur in the iron ore raw materials, the iron ore raw materials are driven to enter the gas-solid separator 7 by negative pressure air flow of the floating preheating conveying pipeline 6-4 after the oxidation reaction, the iron ore raw materials enter the blanking pipe 23 through a blanking port of the gas-solid separator 7, and the rotary kiln 8 enters the gas-solid heat exchanger 9 through a kiln head 8-2 of the rotary kiln; the temperature of the iron ore raw material subjected to gas-solid separation in the gas-solid separator 7 is 750-760 ℃, the iron ore raw material enters the blanking pipe 23 after oxidation reaction at 655 ℃, the temperature of the iron ore raw material after heat exchange of the pulverized coal gasification coil 14 by the blanking pipe 23 is 508 ℃, and the iron ore raw material at 508 ℃ enters the rotary kiln 8 and gradually falls into the kiln head 8-2 of the rotary kiln for magnetization reduction roasting by the rotation of the rotary kiln 8.
Example 3
While the iron ore raw material exchanges heat to the coal powder gasification coil 14 through the blanking pipe 23, coal powder is fed into the coal powder through the coal powder conveying pipeline 13 from a coal feeding port above the mixing chamber 12, an exhaust port of the air blower 11 corresponds to high-speed air flow in the mixing chamber 12, the coal powder in the mixing chamber 12 is mixed with the air flow to form mixed gas, the mixed gas passes through the coal powder gasification coil 14, the temperature of the mixed gas is 420 ℃ to 430 ℃, the mixed gas at 420 ℃ to 430 ℃ enters the exothermic gas of gasification in the exothermic reactor 15, the gas temperature in the gas pipeline 16 is 550 ℃ to 558 ℃, the gas is the reducing agent gas after heat release, and the reducing agent gas enters the rotary kiln 8 through the gas pipeline 16 to carry out magnetization reduction roasting with the iron ore raw material; iron ore raw materials fall into the gas-solid heat exchanger 9 through a discharge port at the lower end after magnetized reduction roasting at 550-558 ℃, and the iron ore raw materials are discharged through the discharge port of the gas-solid heat exchanger 9 to be magnetized iron ore 10 finished products;
in the process of high-temperature magnetization reduction roasting of iron ore raw materials at 550-558 ℃ in the rotary kiln 8, high temperature at 520 ℃ in a kiln tail smoke chamber 8-1 of the rotary kiln enters a roasting furnace 6 through a rising negative pressure air flow pipeline at the top to support combustion of coal dust;
the magnetized iron ore 10 of the gas-solid heat exchanger 9 exchanges heat and cools through normal-temperature air flowing in the heat exchange coil group 17-2, the air after the heat exchange of the flowing air at the outlet of the heat exchange coil group 17-2 is hot air with the temperature of more than 240 ℃, and the hot air sequentially enters the roasting furnace 6 through the air heat exchange pipeline 17-1 to support combustion of coal dust.
Claims (3)
1. A roasting process of a thermal cycle type iron ore oxidation-reduction magnetization roasting device comprises a feed inlet (1), a lifting machine (2), a first suspension preheater (3), a second suspension preheater (4), a third suspension preheater (5), a roasting furnace (6), a first suspension preheating pipeline (6-1), a second suspension preheating pipeline (6-2), a third suspension preheating pipeline (6-3), a fourth suspension preheating conveying pipeline (6-4), a gas-solid separator (7), a rotary kiln (8), a rotary kiln tail smoke chamber (8-1), a rotary kiln head (8-2), a gas-solid heat exchanger (9), a magnetized iron ore (10), a blower (11), a mixing chamber (12), a pulverized coal conveying pipeline (13), a pulverized coal gasification coil (14), a heat release reactor (15), a gas pipeline (16), a normal temperature air inlet pipeline (17), a heat exchange rear air pipeline (17-1), a heat exchange coil group (17-2), a high temperature fan (18), a negative pressure high air pipeline (18-1), a device (19), a machine (20), a chimney (21), a dust collection pipe (22) and a dust collection pipe (23) below the dust collection pipe, A console (24); the method is characterized in that: the feeding end of the rotary kiln (8) is provided with a rotary kiln tail smoke chamber (8-1), one side of a feeding hole of the rotary kiln tail smoke chamber (8-1) is provided with a blanking pipe (23), a gas-solid separator (7) is arranged above the blanking pipe (23), a blanking pipeline is arranged between the feeding hole at the upper end of the blanking pipe (23) and the blanking hole at the lower end of the gas-solid separator (7), and a blanking pipeline is arranged between the lower end of the blanking pipe (23) and the feeding hole of the rotary kiln tail smoke chamber (8-1); a pulverized coal gasification coil pipe (14) is arranged in the blanking pipe (23), a mixing chamber (12) is arranged at the inlet end of the pulverized coal gasification coil pipe (14), a control console (24) is arranged at one side of the mixing chamber (12), a blower (11) is arranged at the inlet of the mixing chamber (12), a pulverized coal feeding port is reserved at the upper end of the mixing chamber (12), and a pulverized coal conveying pipeline (13) is arranged in the pulverized coal feeding port; the discharging end of the rotary kiln (8) is arranged as a rotary kiln head (8-2), the lower end of the rotary kiln head (8-2) is provided with a gas-solid heat exchanger (9), a heat exchange coil group (17-2) is arranged in the gas-solid heat exchanger (9), an inlet pipeline of the heat exchange coil group (17-2) is arranged as a normal temperature air inlet pipeline (17), a discharging opening is reserved at the lower end of the gas-solid heat exchanger (9), magnetized iron ore (10) is arranged in the discharging opening, and the magnetized iron ore (10) is arranged as a uniform granular powdery iron ore raw material; the outlet end of the pulverized coal gasification coil pipe (14) is provided with a thermal reactor (15), one side of the kiln head (8-2) of the rotary kiln is reserved with a gas pipeline opening, and a gas pipeline (16) is arranged between the gas pipeline opening and the thermal reactor (15); the rotary kiln (8) is arranged at an inclination angle that the feeding end is higher than the discharging end, and the middle part of the rotary kiln (8) is arranged as a rotary kiln body;
a roasting furnace (6) is arranged above a kiln tail smoke chamber (8-1) of the rotary kiln, a coal feeding port (22) is arranged on one side of the bottom of the roasting furnace (6), a coal feeding valve and a burner are arranged at an inlet of the coal feeding port (22), a hot air pipeline port is reserved on one side of the coal feeding port (22), and a heat exchange rear air pipeline (17-1) is arranged between the hot air pipeline port and an outlet of a heat exchange coil group (17-2); a material pipeline port is reserved at one side of the lower part of the roasting furnace (6), a rising negative pressure air flow pipeline is arranged between the lower end of the roasting furnace (6) and the top of a kiln tail smoke chamber (8-1) of the rotary kiln, a third suspension preheater (5) is arranged above the roasting furnace (6), and a blanking pipeline is arranged between the material pipeline port at one side of the roasting furnace (6) and a blanking port of the third suspension preheater (5); a gas-solid separator (7) is arranged on one side above the roasting furnace (6), and a fourth suspension preheating conveying pipeline (6-4) is arranged between the top of the roasting furnace (6) and one side of the gas-solid separator (7);
a first suspension preheater (3) is arranged above the third suspension preheater (5), a second suspension preheater (4) is arranged on one side between the third suspension preheater (5) and the first suspension preheater (3), a lifting machine (2) is arranged on one side of the second suspension preheater (4), a feed inlet (1) is arranged at the lower end of the lifting machine (2), and a feed conveying inlet is arranged at the upper end of the lifting machine (2); a second suspension preheating pipeline (6-2) is arranged between the top of the third suspension preheater (5) and one side of the upper part of the second suspension preheater (4), and a blanking feeding pipeline is arranged between the middle part of the second suspension preheating pipeline (6-2) and the blanking port of the first suspension preheater (3);
a first suspension preheating pipeline (6-1) is arranged between the top of the second suspension preheater (4) and one side of the upper part of the first suspension preheater (3), and a blanking feeding pipeline is arranged between the middle part of the first suspension preheating pipeline (6-1) and a conveying port at the upper end of the lifting machine (2); a gas-solid separator (7) is arranged below the second suspension preheater (4), a third suspension preheating pipeline (6-3) is arranged between the top of the gas-solid separator (7) and one side of the upper part of the third suspension preheater (5), and a blanking feeding pipeline is arranged between the middle part of the third suspension preheating pipeline (6-3) and a blanking port of the second suspension preheater (4); the first suspension preheating pipeline (6-1), the second suspension preheating pipeline (6-2), the third suspension preheating pipeline (6-3), the fourth suspension preheating conveying pipeline (6-4) and the normal temperature air inlet pipeline (17) are respectively set to be negative pressure, and the air inlet of the normal temperature air inlet pipeline (17) is set to be positive pressure; the cavities of the first suspension preheater (3), the second suspension preheater (4), the third suspension preheater (5), the roasting furnace (6), the gas-solid separator (7) and the rotary kiln (8) are all set to be negative pressure;
a high-temperature fan (18) is arranged on one side of the first suspension preheater (3), a negative-pressure high-air pipeline (18-1) is arranged between the outlet of the first suspension preheater (3) and the high-temperature fan (18), a chimney (21) is arranged on one side of the outlet end of the high-temperature fan (18), and a dust collector (19) and an exhaust fan (20) are sequentially arranged between the high-temperature fan (18) and the chimney (21); one side of the second suspension preheater (4) is provided with a lifting machine (2), and a material conveying pipeline is arranged between the second suspension preheater (4) and a conveying port at the upper end of the lifting machine (2);
before the iron ore raw material is subjected to oxidation-reduction magnetization processing, the roasting furnace (6) is heated by coal dust; the coal feeding valve and the burner of the coal feeding port (22) are opened through the control console (24), coal powder continuously enters the roasting furnace (6) through the coal feeding port (22) and is heated and ignited through the burner, the heated and ignited coal powder rapidly rises in the roasting furnace (6), and the temperature in the roasting furnace (6) rises to 800-805 ℃; starting a high-temperature fan (18) and an exhaust fan (20) through a control console (24), and sucking air at the inlet end of the high-temperature fan (18) after the high-temperature fan (18) and the exhaust fan (20) are started, wherein the sucked air of the high-temperature fan (18) is sucked into normal-temperature air through an air inlet of a normal-temperature air inlet pipeline (17); the air inlet of the normal temperature air inlet pipeline (17) is used for sucking normal temperature air and sequentially enters a heat exchange coil group (17-2), a heat exchange air pipeline (17-1), a roasting furnace (6), a fourth suspension preheating conveying pipeline (6-4), a gas-solid separator (7), a third suspension preheating pipeline (6-3), a third suspension preheater (5), a second suspension preheating pipeline (6-2), a second suspension preheater (4), a first suspension preheating pipeline (6-1), a first suspension preheater (3), a negative pressure high-wind pipeline (18-1) and a high-temperature fan (18); when the high-temperature fan (18) sucks air in the negative-pressure high-air pipeline (18-1), the air flow between the negative-pressure high-air pipeline (18-1) and the normal-temperature air inlet pipeline (17) is rising negative-pressure air flow, the negative-pressure air flow is discharged into the dust collector (19) through an outlet sucked by the high-temperature fan (18), and purified air is sucked by the exhaust fan (20) and discharged into the chimney (21);
when the rising negative pressure air flow passes through the roasting furnace (6), the negative pressure air flow is heated to be suspension preheating air flow at 800-805 ℃ in the roasting furnace (6), the suspension preheating air flow sequentially passes through a fourth suspension preheating conveying pipeline (6-4), a gas-solid separator (7), a third suspension preheating pipeline (6-3), a third suspension preheater (5), a second suspension preheating pipeline (6-2), a second suspension preheater (4), a first suspension preheating pipeline (6-1), a first suspension preheater (3) and a negative pressure high air pipeline (18-1) from bottom to top, when the suspension preheating air flow is discharged into a dust collector (19) through a high temperature fan (18), the dust collector (19) removes dust and purifies the suspension preheating air flow into purified air, and an exhaust fan (20) sucks the purified air and discharges the purified air into a chimney (21); the suspension preheating air flow is discharged from a chimney (21) through a negative pressure high wind pipeline (18-1).
2. The roasting process of the thermal cycle type iron ore oxidation-reduction magnetization roasting device according to claim 1, wherein: when the suspension preheating airflow sequentially passes through the suspension preheating pipeline and the suspension preheater to normally run, a control console (24) starts a lifting machine (2), iron ore raw materials are fed through a feed inlet (1), the lifting machine (2) conveys raw materials to a conveying port at the upper end, the iron ore raw materials enter a first suspension preheating pipeline (6-1) through a blanking feeding pipeline of the conveying port, the iron ore raw materials in the first suspension preheating pipeline (6-1) and the suspension preheating airflow exchange heat to form suspension flue gas with the temperature of 280-287 ℃, the negative pressure airflow drives the iron ore raw materials to upwards enter the first suspension preheater (3), after gas-solid separation, the temperature of the iron ore raw materials discharged out of the first suspension preheater (3) is 210 ℃, and 300 ℃ high-temperature flue gas discharged out of the first suspension preheater (3) is discharged through a negative pressure high-wind pipeline (18-1); the iron ore raw materials after suspension processing in the first suspension preheater (3) fall to a blanking port at the bottom, the iron ore raw materials enter a second suspension preheating pipeline (6-2) through a blanking feeding pipeline of the blanking port, and the second suspension preheating pipeline (6-2) drives the iron ore raw materials to upwards enter the second suspension preheater (4) through negative pressure airflow;
the second suspension preheater (4) carries out suspension processing of preheating, dewatering and pre-decomposing on the iron ore raw material at the temperature of 496-490 ℃, impurities in the iron ore raw material after suspension processing are high-temperature flue gas, and the high-temperature flue gas in the second suspension preheater (4) is discharged into the first suspension preheater (3) through the first suspension preheating pipeline (6-1); the iron ore raw materials after suspension processing in the second suspension preheater (4) fall to a blanking port at the bottom, the iron ore raw materials enter a third suspension preheating pipeline (6-3) through a blanking feeding pipeline of the blanking port, and the third suspension preheating pipeline (6-3) drives the iron ore raw materials to upwards enter a third suspension preheater (5) through negative pressure airflow;
the third suspension preheater (5) carries out suspension processing of preheating, dewatering and pre-decomposing on the iron ore raw material at the temperature of 650-660 ℃, impurities in the iron ore raw material after suspension processing are high-temperature flue gas, the high-temperature flue gas in the third suspension preheater (5) is discharged into the second suspension preheater (4) through a second suspension preheating pipeline (6-2), the iron ore raw material after suspension processing in the third suspension preheater (5) falls to a feed opening at the bottom, and the iron ore raw material enters a roasting furnace (6) through a feed pipeline at the feed opening;
the roasting furnace (6) carries out oxidation reaction on iron ore raw materials at 800-805 ℃, carbon dioxide, moisture and sulfur in the iron ore raw materials are removed through oxidation reaction, the iron ore raw materials are driven to enter a gas-solid separator (7) through a negative pressure air flow of a fourth suspension preheating conveying pipeline (6-4), the iron ore raw materials enter a blanking pipe (23) through a blanking port of the gas-solid separator (7), and enter a gas-solid heat exchanger (9) through a kiln head (8-2) of the rotary kiln (8); the temperature of the iron ore raw material subjected to gas-solid separation in the gas-solid separator (7) is 750-760 ℃, the iron ore raw material enters the blanking pipe (23) after undergoing oxidation reaction at 655 ℃, the temperature of the iron ore raw material after undergoing heat exchange on the pulverized coal gasification coil (14) by the blanking pipe (23) is 508 ℃, and the iron ore raw material at 508 ℃ enters the rotary kiln (8) and gradually falls into the kiln head (8-2) of the rotary kiln through the rotation of the rotary kiln (8) to be subjected to magnetized reduction roasting.
3. The roasting process of the thermal cycle type iron ore oxidation-reduction magnetization roasting device according to claim 1, wherein: while the iron ore raw material exchanges heat to the coal powder gasification coil pipe (14) through the blanking pipe (23), coal powder is fed into the coal powder through a coal powder conveying pipeline (13) from a coal feeding port above the mixing chamber (12), an exhaust port of the air blower (11) corresponds to high-speed air flow in the mixing chamber (12), the coal powder in the mixing chamber (12) is mixed with the air flow to form mixed coal gas, the mixed coal gas with the temperature of 420 ℃ to 430 ℃ after passing through the coal powder gasification coil pipe (14) enters a coal gas pipeline (16) after gasification and heat release of 420 ℃ to 430 ℃, the coal gas in the coal gas pipeline (16) has the temperature of 550 ℃ to 558 ℃, the coal gas releases heat to form reducer coal gas, and the reducer coal gas enters a rotary kiln (8) through the coal gas pipeline (16) to carry out magnetization reduction roasting with the iron ore raw material; the iron ore raw materials fall into the gas-solid heat exchanger (9) through a discharge port at the lower end after magnetized reduction roasting at 550-558 ℃, and the iron ore raw materials are discharged into a magnetized iron ore (10) finished product through the discharge port of the gas-solid heat exchanger (9);
in the process of high-temperature magnetization reduction roasting of iron ore raw materials at 550-558 ℃ in a rotary kiln (8), high temperature at 520 ℃ in a kiln tail smoke chamber (8-1) of the rotary kiln enters a roasting furnace (6) through a rising negative pressure airflow pipeline at the top to support combustion of coal dust;
the magnetized iron ore (10) of the gas-solid heat exchanger (9) exchanges heat and cools through normal-temperature air flowing in the heat exchange coil group (17-2), the air after the flowing air at the outlet of the heat exchange coil group (17-2) exchanges heat is hot air with the temperature of more than 240 ℃, and the hot air sequentially enters the roasting furnace (6) through the air pipeline (17-1) after heat exchange to support combustion of coal dust.
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| CN202211224460.3A CN117887956A (en) | 2022-10-09 | 2022-10-09 | Roasting process of thermal cycle type iron ore oxidation-reduction magnetization roasting device |
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| CN202211224460.3A CN117887956A (en) | 2022-10-09 | 2022-10-09 | Roasting process of thermal cycle type iron ore oxidation-reduction magnetization roasting device |
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