SU1005882A1 - Method of producing granules mainly of expanded clay aggregate - Google Patents

Abstract

METHOD OF OBTAINING GRANULES, PREVIOUSLY, KERAMZIT,. including pressing of the raw material and its simultaneous heat treatment, characterized in that, with a chain of improved quality of the granules, pressing is carried out in cells, the walls of which are heated to 12 ° -25 ° C.

Description

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The invention relates to the manufacturing process of the construction materials for the manufacture of granules, mainly the raw material GLISCO1CH.

There is a known method of molding plastic granules, which implies that the raw material is placed in a cell, extruded, dried and burned tl.

Ned1kh; tatka this method are the low quality of the resulting claydite and the complexity of the molding operation

Thus, when the raw material is pushed through the cell and the subsequent separation of the granules, due to the considerable forces of adhesion of the clay particles to the cell surface, cracks are formed on the surface of the granules. In the course of further processing, the gases formed as a result of the thermal reaction are used for them, which leads to an increase in the bulk density and decrease in the density of the claydite. Raw material comes out of the press cells in the form of cylinders of indeterminate length). Subsequently, during transport and in the drum, the cylinders break off along the cracks to form granules of various sizes. In the process of rolling, not all cracks are closed, which deteriorates the quality of the semi-finished product. Expanded clay obtained from a screw press and perforated shafts has deep cracks and a shape factor (the ratio of the largest size to the smallest) does not meet the requirements of GOST 9759-76.

The closest technical solution to the proposed 4y is a method and device for granulating wet clay or similar material, including pressing the raw material and its single-item heat treatment, removing the granules from the holes with an air stream or using an elastic roll surface t2j.

The disadvantage of this method is the complexity of its implementation and the impossibility of preserving the integrity and shape of the granules, since removing them from the holes of the forming cylinder with a stream of air results in a sensation of the middle part of the granules due to the considerable forces of adhesion of the raw material to the forming surface of the cylinder.

In addition, in the case of the use of the elastic surface of the roll to remove the granules, the elastic surface is subject to deformatins, which reduce its service life and reliability of the device

Heating a cylinder with holes helps to separate the granules, but it does not ensure the preservation of the shape and integrity of the granules, since drying of the granules does not result in the formation of a compacted surface that ensures preservation.

The purpose of the invention is to improve the quality of the granules.

The goal is achieved by the fact that according to the method, which includes pressing the raw material and its simultaneous heat treatment, pressing is done in cells, the walls of which are heated to 120-250 C.

Heating the cell walls to 120-250 ° C causes the creation of contact heat exchange, in which moisture evaporates from the surface of the raw granules with the formation of an elastic vapor layer, which, when opening the cells, pushes the granules. In addition, the granules acquire a compacted dried crust, which protects them from deformation and helps to preserve their integrity and shape. The compacted dried crust allows, in the process of heating, to retain more intumescent products, which reduces the mass and thermal conductivity of claydite and increases its strength.

The drawing shows a device, with which it is possible to carry out the proposed method under industrial conditions.

In case 1, through a pipe 2, a supply carrier is supplied and, in the event of a shortage of heat, a radiator 3 is turned on. The heat transfer medium, flushing of the V6SCHC, heats them up to 12О250 ° С. The spent coolant is discharged through pipe 4. Raw materials are fed through chute 5 and the granules are removed through chute 6. Raw materials are fed to roller 7 in cells 8. By rotating roller 9, the raw material is pressed and dried from the surface to form an elastic vapor-air layer, which as the rollers rotate pushes molded granules. The latter are removed through the chute 6 and transported to the calcination.

Under laboratory conditions, the proposed method was carried out as follows.

Granules of d-ti 13 mm were molded from the clay material of the Smyshl field with a device containing a cylinder-shaped cell and a puavson. Before forming the matrix was heated in a muffle furnace to

3 10058824

of various temperatures (from 7 ° C) to haydite according to the prevailing oftooo; Then, in the cell of the Shdavalp gypsum, the SBU decreased from 0.52 to O, 37 g / cm

26% humidity. After filing glidomao-by compared with the bale obtained by

sy in the cell of the matrix hit whether poise-apv known spphdab molded into

H “vi and then it was withdrawn. With mold-5 (0.56 g / cm), and the ratio of granules, the granules were monitored and their separation quality increased by 19%.

from the cell.

For comparison, the granules were molded in the manner proposed method

known method. The shape grains are simple to implement, allows for

the zeros were burned in a laboratory furnace to pick up pellets from the raw materials, which were used to increase the technological regime. In addition, it allows

After firing, the density was determined and the drying time was reduced before firing.

Shchiznost polucheno1X) expanded clay. Raft "molded graiul.

Claims (1)

METHOD FOR PRODUCING GRANULES, PREFERREDLY, KERAMZIT, including pressing the feedstock and its simultaneous heat treatment, characterized in that, in order to improve the quality of the granules, the pressing is carried out in cells whose walls are heated to 120-250 * C. 1 1005882