SU555069A1 - Easy placeholder - Google Patents

Description

(54) EASY FILLER

one

The invention relates to the building materials industry and can be used in the production of porous aggregates of the ash type.

A lightweight aggregate is known, consisting of a core and a shell.

Due to the different coefficient of expansion of the charge of the core and the shell with different volatile contents, the quality of the aggregate obtained is unsatisfactory: there are significant defects in the structure of the granules, such as grooves, shells, shells, which reduces their strength properties.

A disadvantage of the known aggregate is the presence of various structural defects, and the more volatiles are introduced into the mixture and the greater the coefficients of expansion of the inner core of the granule and the outer shell, the more significant the defects.

The purpose of the invention is to reduce structural defects in the granules.

This is achieved by the fact that the core is made of a mixture of expanded finely dispersed material, for example, perlite sand and clay, and the shell is

from a mixture of dry ash TPP and powdered clay.

Thin pre-expanded mother:. Titus sand) should have a bulk volume of c,; and.-,; .. ;;: cv not more than 200 kg / m, specific surface area not less than 800, humidity not more than 2%, maximum grain size 0.15 mm, content which in the mixture of fractions should be no more than 5%,

Powdered powder, used as a binder for rolling in the inner core of the granules, should have a plasticity number of at least 18, with a specific surface area of 3000-4000.

The composition of the mixture for the preparation of the internal core of the granules is as follows, wt%:

Expanded perlite sand80-86

Clay14-20

The water consumption for the pelletizing is 16-20% of the dry weight of the mixture.

For the manufacture of the outer structural shell of the granules, it is necessary to use ash of thermal power plants of medium fusibility or low-melting with softening temperature And 00-1250 ° С, specific surface area

not less than 2000 cm / g, the content of unburned fuel is not more than 5%

The clay used to make a constructive shell should have a plasticity number of at least 12, the specific surface area should be at least ZOOOcm.

The composition of the mixture for the structural shell is the following, wt.%:

Ash TPP 60-80

Clay20-40

Water consumption for knurling the outer layer of granules 12-15% by weight of the dry mixture.

An example of obtaining a lightweight filler.

Pre-expanded fine perlite sand and finely ground dry clay with previously specified quality characteristics are mixed together in a dry form. The optimal composition of the following filler, wt.%;

Pearlite Sand 83

Clay17

In the weight parts, this ratio will be 6: 1.

From this mixture, granules are scattered on a plate granulator in a known manner, which are dispersed into fractions so as to obtain one or several batches of granules whose diameter would differ by no more than 2 mm, for example, batches of granules with a diameter of 8.10 and 12mm. For variations in size, granules with a tolerance of ± 0.5 mm are considered suitable.

At the same time, ITI .iiuiicHuiKXiii; i; (H of an anesthetized layer of granules, -i.v., a basis of TPP ash for clay, previously specified properties, a dry powder mixture of the composition is prepared, wt.%:

Ash TPP 70

Clay30

Granules of a semi-finished product of one fraction are fed into the granulator and the mixture and sprayed water is fed continuously. When the naked outer layer reaches a thickness of 2-3 mm, the granulator turns off, the granules are placed in a sintering cylinder and fired in a known manner. Roasting Q is carried out at the temperature of the beginning of softening of the charge of the outer layer of granules. The firing parameters in each case are determined empirically. It should be ensured that the pellets do not melt together. The pellets are cooled when the fuel supply is turned off by blowing the pellets between themselves in the firing process, and they are separated from each other by dropping the fused pieces from a small height onto a wooden floor. Sifting Q pellets are fractionated into fractions. The finished product: chi is a regular-shaped round grains with minor traces on the surface of the gluing sites with neighboring grains. The surface of the granules is smooth, without cracks and other defects.

Claims (1)

Invention Formula A lightweight aggregate consisting of a core and a shell, characterized in that, in order to reduce structural defects in the granules, it is cracked from a mixture of expanded finely dispersed material, for example, perlite sand and clay, and the shell is made from a mixture of dry ash from TES and powdered clay.