A kind of method of lepidolite multistage suspension roasting defluorination

Abstract

The invention discloses a method for defluorinating lepidolite through multi-stage suspension roasting. The method comprises the following steps: feeding lepidolite mineral powder into a two-stage suspension roasting furnace, performing dry preheating roasting on exhaust gas subjected to dust collection by the first-stage cyclone dust collector, separating the preheated mineral powder from the exhaust gas through a second-stage cyclone dust collector, feeding the separated mineral powder into the first-stage suspension roasting furnace, performing roasting defluorination on water vapor-containing combustion gas obtained from a combustion chamber and supplemented water vapor, then putting into the first-stage cyclone dust collector together with gas to complete gas-solid separation, enabling the separated gas to return into the second-stage suspension roasting furnace for preheating newly fed mineral powder, putting the mineral powder collected in the first-stage cyclone dust collectorinto a heat preservation tank, and further feeding water vapor for defluorination, thereby obtaining defluorinated lepidolite. According to the method disclosed by the invention, the defluorination can be quickly completed; compared with a conventional rotary kiln and fluidized bed defluorination process, the method has the advantages of low energy consumption, compact equipment, low investment, high treatment capacity, short defluorination time, precise temperature control, simple flow and thorough defluorination.

Description

technical field [0001] The invention belongs to the technical field of mineral raw material processing, and in particular relates to a multistage suspension roasting defluorination method of lepidolite. Background technique [0002] Lithium and lithium salts have been expanded from traditional application fields such as glass ceramics, electrolytic aluminum, grease, refrigeration, etc. to high-tech fields such as aluminum-lithium alloys, lithium batteries, nuclear fusion, etc., especially the explosive potential of new energy for high-efficiency batteries. The increase in demand poses an urgent challenge to the technological progress of the lithium salt industry. Research on new methods for defluorination of fluorine-containing minerals is of great significance to the subsequent extraction of lithium from ores and the development of new energy sources in the world. [0003] Lepidolite is a fluorine-containing lithium-containing mineral with a dense structure. The fluorine in...

AI Technical Summary

Problems solved by technology

At present, rotary kiln or fluidized bed is generally used to roast lepidolite ore for defluorination. In the defluorination process of rotary kiln, the lepidolite material is not in sufficient contact with water vapor, the furnace temperature is not easy to control, the material in the furnace is easy to melt and form rings, high energy consumption, and steam Large consumption and other outstanding problems; the fluidized bed defluorination system has a large amount of water vapor, complex fluorine-containing gas treatment process, failure to comprehensively utilize the enthalpy of the high-temperature gas in the fluidized bed, high energy consumption, and mineral powder in the fluidized bed Prominent problems such as long residence time in the defluorination process, large bed cross-sectional area in the fluidized bed, and prone to local high temperature

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