Vibratory fluidized bed reactor for continuous production of rare earth fluorides and production method

Abstract

The invention discloses a vibratory fluidized bed reactor for continuous production of rare earth fluorides. The vibratory fluidized bed reactor comprises a feeding device, a discharging device, a fluidized bed, a vibrator and a heating device, wherein a rare-earth-containing material feeding hole is formed in the upper part of a fluidized bed body; a rare earth fluoride product discharge opening communicated with the discharging device is formed in the lower part of the fluidized bed body; a hydrogen-fluoride-containing gas inlet is formed in the bottom of the fluidized bed body; gas distribution plates through which hydrogen-fluoride-containing gas passes and uniform air distribution is realized are arranged in the cavity of the fluidized bed body; an exhaust pipe is arranged on the top of the fluidized bed body; the heating device is arranged on the outer side of the fluidized bed body and covers the fluidized bed body; the vibrator is arranged on the outer wall of the fluidized bed body; the bottom of the fluidized bed body is connected to supports through elastic supporting pieces. According to the scheme in the invention, the fluidization quality can be improved, the mass transfer and heat transfer effects are improved, the production efficiency is high, and the product is uniform and stable in quality, high in fluorination rate and low in process cost.

Description

technical field [0001] The invention relates to a fluidized bed reactor and its application, in particular to a vibrating fluidized bed reactor and a method for producing rare earth fluorides. Background technique [0002] Rare earth fluoride is an important raw material for the production of rare earth metals and alloys by molten electrolysis and calcithermal reduction. In addition, it is also used as an additive for steel and non-ferrous alloys, as an additive for rare earth polishing powder, and as a fluorescent powder. It has a wide range of uses. The production methods of rare earth fluoride mainly include wet method and dry method. Due to the long process of producing rare earth fluoride by wet method, heavy pollution, and high content of crystal water and impurities in the product, it has been gradually listed at home and abroad. Into the elimination process. Dry production has the advantages of simple process, less pollution, no crystal water, and low impurity conte...

AI Technical Summary

Problems solved by technology

The control step of the rare earth oxide fluorination reaction is the internal and external diffusion process, but the average particle size of the industrially produced rare earth oxide is very small (2-11 μm), so the gaps between the particles are also small, and the bed is static, resulting in gas diffusion resistance Therefore, the mass transfer and heat transfer effects of the reaction process are very poor, and the quality of the prepared rare earth fluoride is difficult to ensure uniformity, so the packing height of the general fixed bed rarely exceeds 40mm

In addition, the heating and cooling time of the heating furnace is long, resulting in a production cycle ranging from more than ten hours to forty hours, resulting in low efficiency and high energy consumption in the production process

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