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A roasting defluorination device and process

A roasting and defluorination technology, which is applied in the processing field of mineral raw materials, can solve problems such as the inability to utilize high-temperature tail gas energy, and achieve the effects of promoting migration and transformation, preventing sintering and ring formation, and high heat utilization rate

Active Publication Date: 2017-12-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple and the technology is mature, but this method cannot use the energy of high-temperature tail gas due to the use of wet lye absorption

Method used

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  • A roasting defluorination device and process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] figure 1 Provides a structural schematic diagram of a lepidolite fluidized bed roasting defluorination device, the device includes: feeding system, mineral powder preheating system, fluidized roasting system, water vapor preheating system, gas absorption system, cooling system and ventilation system.

[0109] The feeding system is used to transport lepidolite mineral powder to the mineral powder preheating system, including hopper 1 and screw feeder 2;

[0110] Mineral powder preheating system is used to preheat lepidolite ore to make its temperature reach 800-850℃, including coal-fired fluidized bed 12, coal-fired fluidized bed separator 12-1, four-stage cyclone preheater and cyclone separation 13, the four-stage cyclone preheater includes the first-stage cyclone preheater 3-1, the second-stage cyclone preheater 3-2, the third-stage cyclone preheater 3-3 and the fourth-stage cyclone preheater connected in sequence Preheater 3-4;

[0111] The fluidized roasting syste...

Embodiment 2

[0132] Utilize the device that embodiment 1 provides to carry out lepidolite roasting defluorination, comprise the steps:

[0133] (1) Add lepidolite ore powder into the hopper 1, send it to the fourth-stage cyclone preheater 3-4 through the screw feeder 2, and pass through the third-stage cyclone preheater 3-3 and the second-stage cyclone preheater successively. The heater 3-2 and the first-stage cyclone preheater 3-1 exchange heat with the high-temperature hot flue gas from the coal-fired fluidized bed 12; at the same time, the steam boiler 9 and the combustion chamber 8 generate high-temperature steam;

[0134] (2) The temperature of the preheated lepidolite ore powder rises to 800°C, and is sent into the fluidized bed roaster 5, where it is fully contacted with the high-temperature water vapor (900°C) from the combustion chamber 8 to carry out the roasting defluorination reaction, and its roasting The reaction conditions are: the fluidized bed roaster 5 is a 5-stage fluidi...

Embodiment 3

[0146] Utilize the device that embodiment 1 provides to carry out lepidolite roasting defluorination, comprise the steps:

[0147] (1) Add lepidolite ore powder into the hopper 1, send it to the fourth-stage cyclone preheater 3-4 through the screw feeder 2, and pass through the third-stage cyclone preheater 3-3 and the second-stage cyclone preheater successively. The heater 3-2 and the first-stage cyclone preheater 3-1 exchange heat with the high-temperature hot flue gas from the coal-fired fluidized bed 12; at the same time, the steam boiler 9 and the combustion chamber 8 generate high-temperature steam;

[0148] (2) The temperature of the preheated lepidolite ore powder rises to 850°C, and it is sent into the fluidized bed roaster 5, and fully contacts with the high-temperature water vapor (1000°C) from the combustion chamber 8 to carry out the roasting defluorination reaction, and the roasting The reaction conditions are: the fluidized bed roaster 5 is a three-stage fluidiz...

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Abstract

The invention provides a roasting defluorination device and technology. The roasting defluorination device comprises a feeding system, a mineral powder preheating system, a fluidized-bed roasting system and a vapor preheating system. The fluidized-bed roasting system comprises a fluidized-bed roasting furnace. The feeding system is connected with the mineral powder preheating system. The mineral powder preheating system and the vapor preheating system are connected with the fluidized-bed roasting system. Optionally, the device further comprises a gas absorption system, a cooling system and an air guiding system, the gas absorbing system and the cooling system are connected with the fluidized-bed roasting system, and the air guiding system and the gas absorbing system are connected. The defluorination rate of the roasting defluorination device reaches more than 85%. A solid fluorine fixing agent is used for absorbing fluorine containing tail gas to recycle fluorine resources. Water of a vapor boiler is preheated by heat generated in the high-temperature defluorination tail gas and defluorination material cooling process to generate high-temperature vapor, the heat utilization rate is high, and vapor consumption is low. The roasting process is good in economical efficiency, and the roasting defluorination device and technology are suitable for large-scale continuous industrial production.

Description

technical field [0001] The invention belongs to the technical field of processing methods for mineral raw materials, and relates to a new method for processing fluorine-containing minerals, in particular to a roasting defluorination device and process. Background technique [0002] Lithium is known as the energy element of the 21st century. Lithium and its compounds are widely used in industrial fields such as lithium batteries, ceramics, glass, aluminum smelting, and medicine. In recent years, the demand for lithium has increased due to the widespread use of lithium-ion batteries in portable electronic devices, electric vehicles, space technology and the defense industry. my country is rich in mica resources, among which 2 O content is generally 4-5%. Therefore, how to develop and utilize lepidolite ore economically and efficiently is of great significance to my country's lithium industry. [0003] At present, the lime roasting method is widely used in the industry to e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/10C22B26/12
CPCC22B1/10C22B26/12
Inventor 李军朱庆山孔景李洪钟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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