SU1564137A1 - Method of manufacturing keramzit - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the production of expanded clay. In order to simplify the technology, reduce the cost and improve the swelling conditions in the method of manufacturing expanded clay, together with the granules, high-ash coal in a granular form is introduced into the rotary kiln in an amount of 3-15 wt.% (The grain size of the coal does not exceed the size of the baking granules). The method provides an increase in the productivity of the furnace to 12.6-13.8 m ³ / h, reducing the cost of expanded clay, reducing the consumption of process fuel and simplifying the technology by eliminating the grinding operation during the preparation of powder additives. 2 tab.

Description

The invention relates to the building materials industry, namely the production of expanded clay.

The purpose of the invention is to simplify the technology, reduce the cost and improve the conditions for swelling.

Coal from Ekibastuz and Karaganda deposits is used as coal with a refractory mineral component.

The chemical composition and temperature properties (fusibility) of the mineral component — the ashes of the coal used are presented in Table. one.

Example. For the manufacture of claydite, low-flowing clay raw materials from the Omsk deposit are used. The clay is dried, crushed, molded raw granules with a diameter of 12 mm and served for firing into a rotary kiln simultaneously with coal from Ekibastuz or Karaganda deposits after coarse grinding. The coal supply can be carried out together with the granules from the cold end of the furnace or separately, raw granules are fed from the cold end, and coal through tuyeres. Coal is fed in the amount of 3-15% by weight of the granules and is burned according to the mode of the rotary kiln 2, m. The fraction from the coal should not exceed the size of the calcined raw granules. Specific examples of the implementation of the method are presented in Table. 2

The proposed method, in comparison with the known method, provides an increase in the productivity of the furnace up to 12.6 - 13.8 m3 / h and a decrease in the activity of manufacturing claydite, in particular brand 400, to 5.79-6.16 rubles / m3.

Serving coal as a dusting granular material,

(L

with

ate

oh

Ј

CO 1

containing a mineral component, the refractoriness of which in T 1370 - 1400 ° C (softening temperature) exceeds the expansion temperature of 1050 - 1150 C of the calcined material - raw granules, simplifies the technological process by eliminating preparatory operations for dusting, such as grinding granulation and bonding, since the coal is fed in its natural granular form after coarse grinding, which reduces the cost of the product. In addition, fuel costs for heating and burning the material due to the heat generated in the granulated material layer as a result of burning the organic carbon component are reduced, and the firing conditions are improved and the firing temperature is reduced by creating a reducing medium.

Since the coal fed to the furnace is in a coarse state and contains a refractory component, this causes a gradual heat generation and ash formation to dust in the heating and bulging zones due to the considerable duration of its combustion. The refractory ash residue generated during combustion covers the surface of the firing pellets.

Thus, the use of high-ash coal as a powder

0

five

after burning it gives a whole range of effects.

The supply of coal in the amount of 3-15% ensures a reduction in fuel costs due to the complete burnout of the organic component of the coal with obtaining the maximum heat release.

The grain size of the coal should not exceed the size of the baking granules due to the fact that the duration of the burning of an individual grain is proportional to the square of its transverse size.

An increase in the grain size of the coal leads to the formation of coked particles due to incomplete burnout of its organic component, which reduces the quality of the finished product.

Claims (1)

Invention Formula A method of making claydite, which includes molding granules, swelling them in a rotary kiln with the introduction of 3-15% of the mass of granules of a dusting additive from a mixture of a refractory component and coal, characterized in that, in order to simplify technology, reduce costs and improve conditions swelling, as a dusting additive, coal is introduced into the furnace in granular form, containing the mineral component with a refractoriness greater than the refractoriness of the granules, and the grain size of the coal does not exceed the size of the granules. Table 1 kibas hSuzsky Karaganda 64 29 3.8 1.9 0.7 0.6 t 1300 1400 Over 53 1500 62 27 6.5 1.6 2.5 0.4 1230 1370 Over 30 1500 Serving for firing together with granules filler, wt.% Coal with mineral refractory part with a grain size of 0-15 mm Karaganda Ekibastuz Table 2 Kind of coal is not normalized Kind of coal is not normalized