SU1747193A1 - Method of screen sizing of materials and sizing screen for it - Google Patents

Abstract

Use: classification of material by size. SUMMARY OF THE INVENTION: The starting material is fed to a sieve 2 and moves along its length from the loading part to the unloading part. The material is affected by an electro magnetic field by means of electromagnets 6 installed under the sieve 2 to the closed shells 7. The intensity of the field is periodically changed along the length of the sieve 2 from its discharge part to the loading part. 2 sec. f-ly, 1 ill.

Description

The invention relates to mechanical equipment of mining and processing enterprises and can be used at mining and processing enterprises for the operation of thin and especially thin screening of concentrates in order to increase the iron content in the concentrate.

Self-balancing screen is known.

The disadvantage of this screen is the low extraction of the useful component due to its large losses with an oversize product.

A known screen is used for wet screening of small and thin materials.

A disadvantage of the known screen is the low extraction of the useful component due to its large losses with an oversize product.

For example, with especially thin screening, a sieve is installed at a large angle of inclination, due to which the processed material (pulp) has a high speed of movement. As a result of this, over-sieve product is milled, i.e., part of the useful component is lost with above the sieve product, and a decrease in the angle of inclination of the sieve leads to a decrease in the speed of movement of the processed material along the screen and, therefore, to a decrease in screening efficiency due to coarsening of the under-sieve product.

Closest to the proposed one is a screening method, including supplying the starting material to the sieve, moving the processed material along the sieve from loading to unloading, directed movement of the fractions of the sieve size through the layer to contact with the sieve and through its openings unloading of oversize and sieve products.

The disadvantage of this method is the low extraction of the useful component due to its large losses with an oversize product.

The purpose of the invention is to increase the extraction of a useful component by reducing its loss with an oversize product.

This goal is achieved by the fact that the processed material from the sieve is affected by an electromagnetic field, and the force of action periodically varies from the unloading part of the sieve to the loading one.

This goal is also achieved by the fact that the screen for the implementation of the screening method is equipped with electromagnets that are installed under the sieve in shelters, and the shelters are made of non-magnetic material.

The impact of the electromagnetic field from under the sieve on the processed material provides intensive movement of the useful component through the layer of the processed material on contact with the sieve and through its openings. A periodic change in the force of exposure to the processed material by the electromagnetic field from the sieve from the unloading part of the sieve to the loading increases the residence time of the useful component on the sieve, i.e. reduces the speed of movement of the useful component in the direction of unloading and thereby increases the yield of the useful component in the under-sieve product. Installation under a sieve of electromagnets provides an increase in the extraction of the useful component by reducing its loss with the oversize product by intensifying the movement of the useful component through the layer of the processed material to contact the sieve and through its openings. Installation of electromagnets in shelters. made of non-magnetic material, prevents adhesion of the undersized product on the electromagnets. Thus, the invention provides an increase in the recovery of the useful component.

The drawing shows a diagram of a screen for implementing a method of screening finely divided magnetically susceptible materials.

The essence of the method of screening finely ground magnetically susceptible materials is that they feed the material (pulp) to a sieve, move the material to be processed by loading from unloading, carry out directional fractions of the under-grain size through the layer to contact with the sieve and through its openings, while the processed material from under the sieve is affected by an electromagnetic field, and the force of exposure periodically varies from the unloading part of the sieve to the loading.

The screen for implementing the screening method of finely divided magnetically susceptible materials consists of a box 1 with a sieve 2 and a loading chute 3 made of non-magnetic materials, an alarm vibrocar 4 and supporting elastic elements 5. Under the sieve 2, electromagnets 6 are installed in shelters 7 made of non-magnetic material.

Claims (2)

Four mule isobet retin 1. The method of screening, including feeding the source material to the stu, moving the material from the loading to the unloading end with the separation of the oversize and sublattice fractions, characterized in that, in order to increase the efficiency of the screening of finely ground magnetically susceptible materials, 5 onto the transported material from under the sieves are affected by an electromagnetic field, and the field strength is periodically changed along the length of the sieve from its discharge to the loading part. 10 2. A screen including a box mounted on elastic supports with a sieve located in it, a vibration exciter associated with the box, characterized in that, in order to increase efficiency when screening finely divided magnetically susceptible materials, it is equipped with electromagnets and casings made of non-magnetic material, and the electromagnets are mounted on the length of the sieve under the covers.