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A defluorination roasting device and process for lithium-containing minerals

A roasting device and defluorination technology, which is applied in the defluorination roasting device and the field of defluorination of fluorine-containing minerals, and can solve the problems of large water vapor consumption and low energy utilization rate

Active Publication Date: 2019-06-21
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

[0011] Aiming at the problems of low energy utilization rate and large water vapor consumption in the existing lepidolite roasting and defluorination technology, the object of the present invention is to provide a defluorination roasting device and process for lithium-containing minerals. The defluorination roasting device has High defluorination efficiency, recyclable steam, high energy utilization, etc., especially suitable for large-scale continuous industrial production

Method used

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  • A defluorination roasting device and process for lithium-containing minerals
  • A defluorination roasting device and process for lithium-containing minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] figure 1 Provides a schematic structural diagram of a lepidolite fluidized bed defluorination roasting device, the device includes: a feeding system, a mineral powder preheating system, a fluidized roasting system, a water vapor preheating system, a gas absorption system, and a cooling system and steam circulation system.

[0083] The feeding system is used to transport the materials to be defluorinated to the mineral powder preheating system, including raw material bin 1, hopper 2, and screw feeder 3;

[0084] The mineral powder preheating system is used to preheat the material to be defluorinated to a temperature of 800-850°C, including a combustion chamber 11, a four-stage cyclone preheater and a cyclone separator 15, and the four-stage cyclone preheater includes sequentially connected The first stage cyclone preheater 4-1, the second stage cyclone preheater 4-2, the third stage cyclone preheater 4-3 and the fourth stage cyclone preheater 4-4;

[0085] The fluidize...

Embodiment 2

[0104] Utilize the device that embodiment 1 provides to carry out lepidolite roasting defluorination, comprise the steps:

[0105] (1) Add lepidolite ore powder from the raw material bin 1 into the hopper 2, send it to the first-stage cyclone preheater 4-1 through the screw feeder 3, and pass through the second-stage cyclone preheater 4-2, The third-stage cyclone preheater 4-3 and the fourth-stage cyclone preheater 4-4 exchange heat with the high-temperature hot flue gas from the combustion chamber 11; at the same time, the steam boiler 14 and the hot blast stove 12 generate high-temperature steam ;

[0106] (2) The temperature of the preheated lepidolite ore powder rises to 800°C, and it is sent into the fluidized bed roaster 6, and fully contacts with the high-temperature water vapor (1000°C) from the hot blast stove 12 to carry out the roasting defluorination reaction, and the roasting The reaction conditions are: the fluidized bed roaster 6 is a 5-stage fluidized bed reac...

Embodiment 3

[0118] Utilize the device that embodiment 1 provides to carry out lepidolite roasting defluorination, comprise the steps:

[0119] (1) Add lepidolite ore powder from the raw material bin 1 into the hopper 2, send it to the first-stage cyclone preheater 4-1 through the screw feeder 3, and pass through the second-stage cyclone preheater 4-2, The third-stage cyclone preheater 4-3 and the fourth-stage cyclone preheater 4-4 exchange heat with the high-temperature hot flue gas from the combustion chamber 11; at the same time, the steam boiler 14 and the hot blast stove 12 generate high-temperature steam ;

[0120] (2) The temperature of the preheated lepidolite ore powder rises to 850°C, and is sent into the fluidized bed roaster 6, and fully contacts with the high-temperature water vapor (1000°C) from the hot blast stove 12 to carry out the roasting defluorination reaction, and the roasting The reaction conditions are: the fluidized bed roaster 6 is a three-stage fluidized bed rea...

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Abstract

The invention provides a defluorination calcination device and technology for minerals containing lithium. The defluorination calcination device comprises a mineral powder preheating system, a vapor preheating system, a fluidized bed calcination system and a vapor circulating system, wherein the fluidized bed calcination system comprises a fluidized bed calcination furnace; the mineral powder preheating system and the vapor preheating system are separately connected with the fluidized bed calcination system; the vapor circulating system comprises a steam boiler and a compressor; an air inlet of the steam boiler is connected with the fluidized bed calcination system; a water outlet and a flue gas outlet of the steam boiler are separately connected with an air inlet of the compressor; the air outlet of the compressor is connected with the vapor preheating system; and optionally, the defluorination calcination device also comprises a feeding system, a gas absorbing system and a cooling system. The defluorination rate of the defluorination calcination device achieves 85% or above, and the calcination process is good in economical efficiency; the circulation of a part of vapor is adopted, so that the vapor consumption is reduced; and besides, the cooling of high-temperature defluorination materials is utilized to preheat circulating vapor to generate high-temperature vapor, and the heat utilization ratio is high.

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 defluorination roasting device and process using a fluidized bed. 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 use...

Claims

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Application Information

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