DEVELOPMENT OF A CLASSIFIER WITH COAXIALLY AR-RANGED PIPES FOR THE SEPARATION OF BULK MATERIAL BASED ON SILICA GEL

doi: 10.25712/ASTU.2072-8921.2021.02.029

Abstract

An important task when grinding bulk material based on silica gel in a mill is its further separation into two fractions with a boundary grain of 30 microns. The paper considers the most common classifiers used in industry for the separation of bulk materials. Their use to solve the problem is impossible, due to the low selectivity. The authors of the work proposed the design of the classifier with coaxially arranged pipes. A three-dimensional model of the classifier is presented. The mechanism of separation of bulk material into different fractions is described. The novelty of the classifier is its design, which al-lows creating a stable vortex structure in the inter-tube space with high values of central forces. At the same time, each swirl additionally accelerates the neighboring ones. The paper presents a calculation method that allows you to assemble a classifier from cylindrical pipes of any dimeter. Several variations of creating a classifier from pipes of different diameters according to GOST 3262 – 75 are considered. At the same time, it is shown that with an increase in the area in the intetubular space, i.e., by increasing the distance between the outer and inner cylindrical pipes, the number of swirls decreases, and their diameter increases. A decrease in the width of the gap leads to an increase in the number of vortices in the inter-tube space. The absence of moving parts, ease of manufacture and application, and high selectivity are the main advantages of the developed classifier with coaxially arranged pipes.