SU1299998A1 - Raw mixture for producing keramzit - Google Patents

Abstract

The invention relates to the production of building materials and can be used in the manufacture of expanded clay obtained by firing in a rotary kiln. To reduce the bulk density of haydite and expand the temperature range of swelling, the raw mix for the manufacture of haydite contains, in wt.%: - clay raw material 30-93; dust entraining of ferrosilicon production 7-70. 1 tab.

Description

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The invention relates to the production of building materials and can be used in the manufacture of expanded clay obtained by burning pellets in a rotary kiln.

The purpose of the invention is to reduce the bulk density of expanded clay and the expansion of the temperature range of swelling.

The raw material mixture for the manufacture of expanded clay includes, by weight,%: clay raw material 30-93; dust entraining of ferrosilicon production 7-70.

Dust ablation is a finely dispersed gas cleaning dust from furnaces during the production of ferrosilicon, which consists of a base of amorphous silica. Pypy particles are in the shape of

zhinok, specific surface 25,000 - 100000 cm / g and more, and a bulk density of 150-300 kg / m.

The chemical composition of dust, wt.%: SiOj 85-94; , 1.3-2; ) 0.3-4 CaO 0.3-2; MgO 1.7-3.1; , 0.2-0.6 SOj 0.7-1.5; 0.1-0.6; 0.2 - 1.8; 0.05-0.2; ppt 0.2-2.3. °

Drinking is formed as a waste of production at the factories of ferroalloys and electrometallurgical plants.

Drinking is introduced into the clay raw material at the beginning of the technological process of making the aggregate, for example, before the raw materials are fed to the coarse grinding rolls. Further processing of the obtained raw material mixture is carried out as with conventional claydite technology.

Content of clay component raw materials

dust entraining of ferrosilicon production

expanded clay dust

temperature interval of expanded clay expanded, with

nasty density of keramite, kg / m

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five

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Examples of the composition of the raw material mixture and the properties of the filler are presented in the table in comparison with the known composition using one type of clay raw material.

The use of fly ash from the production of ferrosilicon 7-70 wt.% In the composition of the clay raw material allows reducing the bulk density of expanded clay to the level of 250-350 kg / m, and an increase in the temperature interval of

33-75 ° C provides the possibility of burning the granules of expanded clay in an advanced rotary kiln. The high dispersion of the sandy ash ensures the most complete flow of physical and chemical reactions during sintering and swelling of the clay raw material.

Claims (1)

Invention Formula The clay mixture for the manufacture of expanded clay, including clay raw materials and waste from the production flya, characterized in that, in order to reduce the total density of the clay and increase the temperature range of swelling, it contains as a waste of dust-like production of ferrosilicon at the following ratio of components, wt%: Clay raw material 30-93 Dust-ash production of ferrosilicon 7-70 thirty 70 93 70 70 thirty thirty 35 75 33 15 356,249 343 443