SU1701675A1 - Stock for producing agglomerated porous filler - Google Patents

Abstract

The invention relates to building materials and can be used to obtain agloporite based on industrial wastes. To increase the vertical speed of sintering and reduce the bulk density of agloporite and save natural clay raw materials, the raw material for the production of agloporite includes, in wt.%: 82.5-84.5 departure from burning coal in the furnaces of the fluidized bed; refund 7-8; coal 5.5-6 and lignin 3-3.5. Agloporite in fractions of 5-20 mm has a bulk density of 445-525 kg / m3, the vertical sintering rate of the charge is 10.9-11.3 mm / min. 4 tab.

Description

The invention relates to mixtures for the manufacture of agloporite, an artificial porous aggregate for lightweight concrete, and can be used in the building materials industry.

The aim of the invention is to increase the vertical sintering rate, reduce the bulk density of agloporite and save natural clay raw materials.

As a main component, residues from the combustion of coal grade GR mine them. 26th Congress of the CPSU in the city of Pavlograd, Dnipropetrovsk region. Coal is burned in a fluidized bed or a fluidized bed furnace.

The grain composition of residues from the combustion of coal in the fluidized bed furnaces are presented in Table 1.

The bulk density is 1000-1150 kg / m3.

The chemical composition of residues from the combustion of coal in a fluidized bed furnace is as follows, wt%: Sl02

60.45; A120Z 19.48; TlCfcOJI; Рв20з5,89; Cao 2.25; MDO 1.56; SO3 0.92; Na2O 1.78; K2O 2.05; ppt 1.56.

The fuel used is coal grade ASH, the grain composition of which is presented in Table 2.

In addition, lignin, which is a waste from hydrolysis production, is introduced into the charge. The chemical composition of lignin ash is as follows, wt%: SI02 34.46; A12OZZ, 51; Re203 25.68; CaO 22.70; MDO 2.56; 8Oe5.34; Na20 1.74; 1.32; ppt 0.23.

To improve the gas permeability of the sintered layer, a return is introduced into the charge. The latter is an agloporite poorly grained grain, which, after the sintering process has been completed, is on a knockout grid specially installed for this purpose in the production line.

The grain composition of the return is presented in table 3.

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I

The preparation and sintering of the charge are as follows.

Components of the charge: residues from burning coal, lignin, coal, returning, dosing to a common collecting conveyor (mass dosing), are fed to a pre-dump clay mixer, where they are mixed and moistened to a moisture content of 10-11%. The granulation of the mixture is carried out in a drum granulator. The bulk density of such a mixture is 945-950 kg / m.

The sintering of the prepared batch is performed at the sintering plant. The ignition temperature of the charge is 1060-1070 ° C, the vacuum in the vacuum chambers is 180- 190mm water.

In the sintering process, the temperature of the charge ignition, the temperature of the exhaust gases is controlled, and the vacuum under the grate is controlled. After the end of the process, the vertical sintering rate, the sintering process productivity and the quality indicators of the material obtained are determined.

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The results of sintering are presented in table 4.

Agloporite bulk density of 445-525 kg / m3 in fractions of 5-20 mm is obtained from the raw mix. The vertical sintering rate is 10.9-11.3 mm / min. In the raw mix is completely excluded natural clay raw materials.

Claims (1)

Invention Formula The raw material mixture for the production of agglomerate, which includes waste from burning coal, return and addition, characterized in that, in order to increase the vertical sintering rate, reduce the bulk density of agloporite and save natural clay raw materials, it contains from burning coal in boiling furnaces cros, a as an additive coal and lignin in the following ratio, wt.%: Burn Burn coal in the furnaces fluidized bed 82,5-84,5 Return 7-8 Ugsl5,5-6 Lignin3-3.5 Fractions, mm More than 10 Grain content, May. % Table 1 thirty table 2 Table 3 Table 4