A defluorination roasting device and process for lithium-containing minerals

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...

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