CN218969324U - Aerobic cooling system for suspension magnetization roasting ore - Google Patents
Aerobic cooling system for suspension magnetization roasting ore Download PDFInfo
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- CN218969324U CN218969324U CN202223224231.XU CN202223224231U CN218969324U CN 218969324 U CN218969324 U CN 218969324U CN 202223224231 U CN202223224231 U CN 202223224231U CN 218969324 U CN218969324 U CN 218969324U
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Abstract
The utility model provides an aerobic cooling system for suspension magnetization roasting ores, which comprises a first material sealing device, wherein an outlet of the first material sealing device is sequentially connected with a fluidized bed, a second material sealing device and a slurry making tank, a flue gas outlet of the fluidized bed is sequentially connected with a gas cooling device, a dust remover, a fan and a pressure stabilizing tank, and an inlet of the dust remover is also connected with a first flow regulating device and a second flow regulating device which are arranged in parallel. The mixed gas introduced into the cooler can be recycled, and air can be used as the circulating gas of the fluidized bed to replace the reducing agent and the inert gas, so that the magnetism of magnetite is ensured, the energy cost is low, and the purposes of circulating cooling and waste heat recovery are realized.
Description
Technical Field
The utility model belongs to the technical field of metal smelting, and relates to an aerobic cooling system for suspension magnetization roasting ores.
Background
The complex refractory iron oxide ore in China has very rich resources, low iron grade, complex mineral composition, weak magnetism and finer embedded granularity, and ideal sorting indexes are difficult to obtain by adopting a conventional ore dressing process. If the ore is subjected to magnetizing roasting treatment, the obtained artificial magnetite is subjected to magnetic separation, reverse flotation and other processes, so that good ore dressing indexes can be obtained.
In recent years, the flash magnetization roasting and suspension magnetization roasting technology has been greatly researched and developed, and the fluidization magnetization roasting technology has been industrially applied. Compared with the traditional rotary kiln, shaft furnace and other magnetic roasting modes, the method has a higher application prospect. The cooling mode is also greatly improved, the traditional water cooling mode has good cooling effect and high metal recovery rate, but magnetite has large remanence and is difficult to sort.
The artificial magnetite obtained from different iron ores by adopting a magnetizing roasting process can undergo reoxidation reaction to generate gamma-Fe when contacting with air in the fluidization cooling process 2 O 3 Or alpha-Fe 2 O 3 And releases a large amount of reaction heat. gamma-Fe 2 O 3 Belongs to a strong magnetic mineral, can be effectively recovered by adopting weak magnetic separation, and the alpha-Fe 2 O 3 Belongs to weak magnetic minerals, can not be recovered by weak magnetic separation, and is easy to cause metal loss.
In recent years, with the development of magnetizing roasting technology, iron ore is made into powder, and a fluidized roasting method is gradually applied. The fluidization magnetization roasting technology has the characteristics of low energy consumption, large treatment capacity, small occupied area, high utilization rate of waste heat, capability of treating powder ore and the like. However, the powder high-temperature material waste heat cooling system is not mature in technology, the risk of generating weak magnetic hematite through peroxidation reaction when reducing calcine contacts with air at high temperature is restrained by adopting a reducing agent or inert gas, the industrial cost is increased, and meanwhile, waste gas returns into the furnace, so that the load of the magnetizing roasting furnace is increased.
Thus, for the above-mentioned failureThe method adopts air and circulating waste gas as mixed gas and reduced ferromagnetic mineral Fe 3 O 4 Fully contacting, precisely regulating and controlling the fluidization condition, controlling the oxygen content in the fluidization gas, avoiding peroxidation, enabling partial ferromagnetic iron minerals to only undergo micro oxidation reaction, and converting the crystal structure into magnetite gamma-Fe 2 O 3 On one hand, the economic problem caused by using inert gas or reducing gas to inhibit the peroxidation of the high-temperature magnetite is solved, on the other hand, the oxidation atmosphere is manually regulated to ensure that partial magnetite only undergoes 'micro-oxidation' reaction, and the crystal structure is converted into magnetite gamma-Fe 2 O 3 The selectivity of the artificial magnetite is improved.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and provides an aerobic cooling system for a suspension magnetized roasting ore, which is used for reducing the cost of a high-temperature powdery magnetite cooling stage of a magnetized roasting plan and creating a condition for reoxidation of the high-temperature magnetite.
For this purpose, the utility model adopts the following technical scheme:
the utility model provides a suspension magnetization calcination ore deposit aerobic cooling system, includes first material sealing device, the export of first material sealing device has connected gradually fluidized bed, second material sealing device and slurrying groove, the export of fluidized bed has connected gradually gas cooling device, dust remover, fan and surge tank, the import of dust remover still is connected with first flow adjusting device and the second flow adjusting device that is parallelly connected setting.
Further, the outlet of the surge tank is sequentially connected with a second flow adjusting device and a fluidized bed.
Further, the outlet of the dust remover is also connected with a slurry making tank.
The utility model has the beneficial effects that:
the utility model is different from the traditional magnetizing roasting system that inert gas passing through the fluidized bed is directly discharged, the gas passing through the fluidized bed can be recycled, the nitrogen dosage is reduced, the recycling of air and nitrogen can be realized, and the nitrogen is greatly reducedGas consumption, O in air with prolonged cycle time 2 The method can effectively avoid the peroxidation of the high-temperature magnetite by gradually reducing, and can gradually supplement fresh air in the later stage so as to oxidize the high-temperature magnetite into maghemite or artefact hematite (gamma-Fe) by utilizing oxygen in the fresh air 2 O 3 ) The method can improve the ore selectivity, solves the problem of high-temperature oxidation, reduces the production cost and has remarkable benefit.
Drawings
Fig. 1 is a schematic diagram of a system structure according to the present utility model.
In the figure, a first material sealing device, a 2-fluidized bed, a 3-second material sealing device, a 4-slurry making tank, a 5-gas cooling device, a 6-dust remover, a 7-fan, an 8-surge tank, a 9-first flow regulating device, a 10-second flow regulating device and 11-oxygen content detection equipment are arranged.
Detailed Description
The technical scheme of the utility model is described in the following with reference to the accompanying drawings and the implementation method.
As shown in fig. 1, an aerobic cooling system for suspended magnetized roasting ore comprises a first material sealing device 1, wherein an outlet of the first material sealing device 1 is sequentially connected with a fluidized bed 2, a second material sealing device 3 and a slurry making tank 4, a flue gas outlet of the fluidized bed 2 is sequentially connected with a gas cooling device 5, a dust remover 6, a fan 7 and a pressure stabilizing tank 8, an inlet of the dust remover 6 is further connected with a first flow regulating device 9, an outlet of the pressure stabilizing tank 8 is sequentially connected with a second flow regulating device 10, an oxygen content detecting device 11 and the fluidized bed 2, and an outlet of the dust remover 6 is further connected with the slurry making tank 4.
The mixed gas introduced into the gas cooling device 5 contains compressed air, and belongs to an aerobic cooling mode, wherein the aerobic cooling mode can utilize oxygen in the air to convert partial magnetite into maghemite or artefact hematite (gamma-Fe) in a high temperature environment 2 O 3 ) The method comprises the steps of carrying out a first treatment on the surface of the In addition, the ratio of nitrogen to air entering the circulating pressurizing unit can be adjusted, and the micro-oxidation reaction in the cooler can be controlled to inhibit the peroxidation reaction.
The application process of the utility model is as follows: the reduced calcine of 2mm enters the fluidized bed 2 through the first material sealing device 1 to be cooled to a certain temperature, and then enters the pulping tank 4 through the second material sealing device 3 at the outlet of the fluidized bed 2 to be subjected to water-cooling pulping, wherein the first material sealing device 1 and the second material sealing device 3 are used for sealing the front and rear gases of the device and preventing mutual channeling; then, a certain amount of nitrogen is introduced into the system, enters the dust remover 6 for filtration, is pressurized by a fan 7, enters a pressure stabilizing tank 8, is sent into the bottom of the fluidized bed 2 through a gas conveying pipeline to serve as fluidizing air, and after being cooled by a gas cooling device 5, the flue gas at the top of the fluidized bed 2 is collected and enters the dust remover 6 for circulation in sequence.
Specifically, an air and nitrogen supplementing device is arranged at the inlet of the dust remover 6, a differential pressure detecting device is arranged on the body, and a particulate matter detecting device is arranged at the flue gas outlet; the pressure stabilizing tank 8 body is provided with a circulating gas exhausting device, a pressure monitoring device, a flow regulating device and an oxygen content detecting device.
The utility model uses nitrogen as the gas for circulating gas in the initial stage of operation, high-temperature powdered magnetite enters the fluidized bed 2 and is fluidized under the action of the nitrogen, waste gas generated by the fluidized bed 2 is cooled to below 200 ℃ by the gas cooling device 5 and enters the dust remover 6, after a period of operation, the circulating gas flow and the temperature are stable, a proper amount of air enters the dust remover 6 through the first flow regulating device 9 and is mixed with the circulating gas to form mixed gas, oxygen in the mixed gas contacts with the high-temperature magnetite to generate micro-oxidation reaction, and part of magnetite is converted into maghemite or artefact hematite (gamma-Fe) 2 O 3 ) The waste heat is discharged through the second material sealing device 3 after being cooled, enters the pulping tank 4 for water cooling and pulping, and is conveyed to the weak magnetic separation system through the slurry pump, so that the purposes of circulating cooling and waste heat recovery are realized.
Claims (3)
1. The utility model provides a suspension magnetization calcination ore deposit aerobic cooling system, its characterized in that includes first material sealing device, the export of first material sealing device has connected gradually fluidized bed, second material sealing device and slurry making groove, the flue gas export of fluidized bed has connected gradually gas cooling device, dust remover, fan and surge tank, the import of dust remover still is connected with first flow adjusting device and the second flow adjusting device that is parallelly connected setting.
2. The aerobic cooling system for suspended magnetized roasted ores according to claim 1, wherein the outlet of the surge tank is sequentially connected with a second flow regulating device and a fluidized bed.
3. The aerobic cooling system for suspended magnetized roasted ores according to claim 1, wherein the outlet of the dust remover is further connected with a slurry making tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223224231.XU CN218969324U (en) | 2022-12-02 | 2022-12-02 | Aerobic cooling system for suspension magnetization roasting ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223224231.XU CN218969324U (en) | 2022-12-02 | 2022-12-02 | Aerobic cooling system for suspension magnetization roasting ore |
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| Publication Number | Publication Date |
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| CN218969324U true CN218969324U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223224231.XU Active CN218969324U (en) | 2022-12-02 | 2022-12-02 | Aerobic cooling system for suspension magnetization roasting ore |
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2022
- 2022-12-02 CN CN202223224231.XU patent/CN218969324U/en active Active
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