Narrow-sized level multi-stage vortex air classifier classification system

Abstract

The invention provides a narrow-sized level multi-stage vortex air classifier classification system, belonging to the field of ultrafine powder preparation. The system comprises a motor, a feeder, an optional scatter device, a primary rotoclone collector, a flap valve, a primary vortex air classifier, a secondary rotoclone collector, two stages of vortex air classifiers, a bag type dust collectorand a centrifugal fan, wherein the two stages of vortex air classifiers are connected in series to realize multi-stage classification; the primary rotoclone collector and the first stage of vortex air classifier are separated through the flap valve to realize gas and solid separation and continuous and stable material feeding; the secondary rotoclone collector and the second stage of the vortex air classifier are separated through the flap valve with the same mode; a long and short blade alternate assembly mode or equal-length assembly mode is adopted on rotating cages in the two stages of vortex air classifiers; and air ducting blades are of stream line form or straight plate form. By the classification system, the materials are classified in two stages, so that the granularity range of classified fine powder products is remarkably narrowed, and the granularity of the classified fine powder products is reduced.

Description

technical field [0001] The invention relates to a dry method for preparing narrow grade ultrafine powder equipment, which belongs to the field of dry preparation of ultrafine powder. Background technique [0002] Narrow-grade ultrafine powder is the basis for the preparation of structural and functional materials, and is widely used in fine ceramics, electronic components, high-quality refractory materials, fine chemicals, and cutting-edge defense technologies. [0003] The vortex air classifier is an important dry classification equipment for preparing ultrafine powder. Its classification principle is: the air flow enters the volute of the classifier tangentially from two parallel and symmetrical air inlets, and is arranged along the spiral volute through a ring. The wind guide vanes enter the annular area between the outer edge of the drum and the inner edge of the wind guide vanes. Due to the suction effect of the centrifugal fan, a negative pressure is formed in the cen...

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Problems solved by technology

[0004] At present, the particle size distribution range of fine powder products obtained by grading by grading equipment is wide, which cannot meet the production needs of high-end products, and the added value of products is low. Various industries urgently need a large amount of narrow-grade ultra-fine powder materials, so there is an urgent need to solve narrow-grade ultra-fine powder. Theory, process and equipment problems of preparation technology, the key to solving this problem is the narrow-level classification of ultra-fine powder, and the ultra-fine powder classification to obtain narrow-level ultra-fine powder must adopt multi-stage classification in theory

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