SU1719373A1 - Refractory body for plugging blast furnace iron tap-holes - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to compositions of refractory materials, in particular, refractory masses for the closure of cast-iron sockets of blast furnaces. The purpose of the invention is to increase the mechanical strength at normal temperature and after heating to 1500 ° C, reducing shrinkage and cheapening. Refractory mass contains, wt.% Waste siliconizing filling production of silicon carbide products fr. 5-0,5 mm - 36,5-41, fr. less than 0.5 mm - 19.5-22, coal tar pitch 7-9, clay the rest is refractory. The introduction of waste siliconizing filling production carbide silicon products contributes to the rapid sintering of the masses during heating, high bulk stability, and also increases the strength at service temperature and gas permeability of the masses 2 tab. SO with

Description

FIELD OF THE INVENTION The invention relates to compositions of refractory materials, in particular, refractory masses for the closure of cast-iron sockets of blast furnaces.

The aim of the invention is to increase the gas permeability, mechanical strength at normal temperature and after heating to 1500 ° C, reducing shrinkage and cheapening of the mass.

The chemical composition of spent siliconizing backfill is as follows,%: SfO 60-70; SiC10-15; C 10-20; CaF2 3-4.

The use of the heat-treated material at 2300 ° C as a component of the pulp mass, during which all carcinogenic and toxic substances are removed.

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substances, significantly reduces their release during mass service in the blast furnace voucher, which improves the working conditions of service personnel.

The use of heat-treated material makes it possible to obtain a non-shrinking mass. The lack of mass shrinkage ensures high volumetric stability and, at the service temperature, contributes to the compaction of the mass in the orifice of the tap hole, which creates trouble-free tap hole operation.

Silica, silicon carbide, and carbon, which are part of the waste, form, in the process of mass service, a complex composition based on SlC-SIOz, providing

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high mechanical strength and resistance to molten iron and slag.

Due to the balanced grain composition of the waste siliconizing backfill of the production of carbide silicon products, the mass has good formability, high gas permeability, contributing to the rapid removal of volatile. During service, the mass does not show a tendency to cracking and flaking.

The components of the charge are crushed, scatter and mix the necessary fractions.

From the resulting mixture is pressed billet at a specific pressure of 40 MPa. An aqueous solution of lignosulfonate with a density of 1.23 g / cm3 is used as a temporary binder. Next, the workpiece is subjected to firing at 1370 ° C in the backfill of cryptol.

The composition of the charge and the properties of the products are given in table 1 and 2.

Claims (1)

Claims Refractory mass for closing pig iron notches of blast furnaces, including refractory clay, coal tar pitch and silica-containing aggregate of 5 5 mm fraction, characterized in that, in order to increase gas permeability, increase mechanical strength at normal temperature and after heating to 1500 ° C, reduce shrinkage and reduce the weight of the mass, it contains as silica filler waste siliconizing backfill production of carbide silicon products of a fraction of 0.5-5 mm and less than 0.5 mm in the following ratio of components in May. %: Coal tar 7-9 Siliconizing charge backfill for carbide-silicon production products of fraction 0.5-5 mm 36.5-41 Waste of siliconizing backfill of production silicon carbide products with a fraction less than 0.5 mm19.5-22 Refractory clay Else Table 1 table 2