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A roasting defluorination device and process

A roasting and defluorination technology, applied in lepidolite fluidized bed roasting defluorination device and process field, can solve the problems affecting the normal operation of the rotary kiln process, unreasonable recovery and utilization of fluorine resources, and inability to use high-temperature tail gas energy, etc., to achieve Reduce corrosion and environmental pollution, promote migration and transformation, and improve defluorination efficiency

Active Publication Date: 2018-04-03
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

[0007] (2) Problems such as ringing of charge at high temperature: Due to the existence of low-melting point substances in lepidolite, when the roasting temperature is too high when processing lepidolite in a rotary kiln, it is inevitable that the charge will melt and form rings on the furnace wall , which seriously affects the normal operation of the rotary kiln process; if the roasting temperature is too low, it will affect the defluorination efficiency of lepidolite
[0008] (3) The utilization rate of high-temperature defluorination tail gas is low, and there are disadvantages of high energy consumption, large steam consumption and poor economy, which are also unfavorable factors restricting the industrial application and promotion of rotary kiln roasting defluorination
[0009] (4) The recovery and utilization of fluorine resources is unreasonable. During the defluorination and roasting process of lepidolite, fluorine escapes mainly in the form of HF. If it is not treated and directly discharged into the atmosphere, it will cause harm to the environment.
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
  • A roasting defluorination device and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] figure 1 Provides a schematic structural diagram of a lepidolite ore fluidized bed roasting defluorination device, the device includes: a material mixing system, a mixed material preheating system, a fluidized roasting system, a water vapor preheating system, a gas absorption system, and a cooling system and ventilation system.

[0129] The material mixing system is used to mix lepidolite ore powder and defluorinating agent and transport them to the mixed material preheating system, including mixing bin 1, hopper 2 and screw feeder 3;

[0130] The mixture preheating system is used to preheat the mixture of lepidolite powder and defluorinating agent to make the temperature reach 800-850°C, including coal-fired fluidized bed 13, coal-fired fluidized bed separator 13-1, four The first-stage cyclone preheater and cyclone separator 14, the four-stage cyclone preheater includes the first-stage cyclone preheater 4-1, the second-stage cyclone preheater 4-2, and the third-stage...

Embodiment 2

[0154] figure 2 Provides a schematic structural diagram of a lepidolite ore fluidized bed roasting defluorination device, the device includes: a material mixing system, a mixed material preheating system, a fluidized roasting system, a water vapor preheating system, a gas absorption system, and a cooling system and ventilation system.

[0155] The material mixing system is used to mix lepidolite ore powder and defluorinating agent and transport them to the mixed material preheating system, including mixing bin 1, hopper 2 and screw feeder 3;

[0156] The mixture preheating system is used to preheat the mixture of lepidolite powder and defluorinating agent to reach a temperature of 800-850°C, including coal-fired fluidized bed 13, coal-fired fluidized bed separator 13-1, four-stage Cyclone preheater and cyclone separator 14, the four-stage cyclone preheater includes the first-stage cyclone preheater 4-1, the second-stage cyclone preheater 4-2, and the third-stage cyclone preh...

Embodiment 3

[0179] Utilize the device that embodiment 1 provides to carry out lepidolite roasting defluorination, comprise the steps:

[0180] (1) Fully mix lepidolite ore powder and defluorinating agent in the mixing chamber 1, then send them into the hopper 2, send them to the fourth-stage cyclone preheater 4-4 through the screw feeder 3, and pass through the third stage in turn The cyclone preheater 4-3, the second-stage cyclone preheater 4-2 and the first-stage cyclone preheater 4-1 exchange heat with the high-temperature hot flue gas from the coal-fired fluidized bed 13; at the same time, The steam boiler 10 and the combustion chamber 9 produce high-temperature steam;

[0181] (2) The temperature of the preheated lepidolite ore powder and defluorinating agent rises to 800°C, and they are sent to the fluidized bed roaster 6, and fully contact with the high-temperature water vapor (900°C) from the combustion chamber 9 for roasting and defluorination. The fluorine reaction changes the ...

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Abstract

The invention provides a roasting defluorination device and process. The roasting defluorination device includes a material mixing system, a mixture preheating system, a water vapor preheating system and a fluidized bed roasting system. The fluidized bed roasting system includes a fluidized bed Roasting furnace, the material mixing system is connected with the mixture preheating system, the mixture preheating system and the steam preheating system are connected with the fluidized bed roasting system; optionally, the device also includes a gas absorption system, a cooling system and an induction The wind system, the gas absorption system and the cooling system are connected with the fluidized bed roasting system, and the air induction system is connected with the gas absorption system. The device can achieve in-situ defluorination, with a fluorine fixation rate of over 95%, and a defluorination rate of over 90%. High-temperature water is produced by using high-temperature defluorination tail gas, high-temperature flue gas generated by the combustion chamber, and heat generated by cooling defluorinated materials Steam, high heat utilization rate; low water vapor consumption, good economical roasting process, 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 roasting defluorination device and process, in particular to a lepidolite fluidized bed roasting defluorination device and process. Background technique [0002] Lithium and its compounds are important basic raw materials for lithium battery new energy materials. The main storage methods of lithium resources in nature are salt lake brine and pegmatite ore. Among them, lepidolite is generally only produced in pegmatite ore, and is one of the two most important industrial lithium minerals. In order to effectively utilize lepidolite, domestic and foreign scientific workers have carried out a lot of research work and obtained a lot of experience in producing lithium salt from lepidolite. However, since the American Potash and Chemical Company San Antonio lithium plant stopped production in 1966, the world There is no large-scale processing lepid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B26/12
Inventor 朱庆山李军孔景李洪钟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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