SU661020A1 - Refractory compound for stopping up blast furnace tapholes - Google Patents

Description

The invention relates to compositions of a refractory mass and can be used to close the cast iron of the blast furnaces.

Closest to the proposed technical essence and the achieved results are refractory mass for sealing the taphole of blast furnaces, containing ground coke, refractory ground clay, ground HopOHjoK and binder 1.

The disadvantage of the known mass is the low resistance to the effects of slag, iron and gaseous gases and low temperature resistance due to its high humidity and low content of carbon-containing substances.

The purpose of the invention is to increase the heat resistance, heat resistance and increase the plasticity of the refractory mass.

The goal is achieved by the fact that the composition of the mass containing coke, ground, refractory ground clay and ngamot powder, as a binder, was introduced coal preparation resin in the following ratio of components, weight. %:

Fireproof hammer

clay 20-30

Fireclay powder 10-15

Carboniferous prepared resin20-25

Ground coke Else.

The input of MILK coke in the amount of 30-50 wt. ° / o is chosen from the conditions for achieving the resistance of the corrosive action of the liquid (h) in).

A decrease in the percentage of ground coke leads to a decrease in the stability of the mass, and an increase in the content of coke is not economically feasible.

Enter refractory ground clay in an amount of 20-30 weight. The ° / o is explained by the best indicators of the plasticity of the mass. A decrease in the percentage content of the CLAY refractory ground leads to a decrease in plasticity and, accordingly, to loosening of the mass, and an increase leads to a decrease in the strength properties of the mass.

Enter chamotte powder in the amount of 10-15 wt. ° / o is selected from the conditions for obtaining the required heat resistance and heat resistance. A decrease in the percentage of chamotte powder leads to a decrease in heat resistance and heat resistance of the mass, and an increase to a decrease in its plasticity. Entering the binder of coal prepared resin in the amount of 20-25 weight. The% is explained by the best bonding conditions for all components and the lowest moisture content in the mass. A decrease in the percentage of the prepared resin leads to a decrease in the resistance of the mass due to the low carbon dioxide content, their weight, and an increase leads to destruction due to the formation of a large number of volatile substances. , The mass is prepared by grinding the coke and refractory clay and mixing them with chamotte powder and coal-tar prepared resin, preheated to 100-120 ° C. The humidity of the finished mass is not more than 3 ° / o. The prepared mass is loaded into closed containers and fed to the workplace, the blast furnace of blast furnaces. Example. Tests were carried out on a 3000 m blast furnace of three compositions of the proposed refractory mass and one known mass at the following ratio, the ratio of components, weight. % Offered massI II III Ground coke50 39 30 Refractory clay hammer 20 25 30 Chamotte powder 10 14 15 Mass composition A "2

Oz CaO feOgeOz p.p.p.p.p Carboniferous prepared resin20 22 25 Mass humidity 1.5 1.0 1.0 Mass of Hammer refractory clay20 Coxyc65 Peck ground 15 Mass humidity 20–22% of the table shows the chemical composition of the known refractory masses. The proposed mass after firing has the following indicators of properties: volume shrinkage of 0.57%, apparent density of 1.9 g / cm2, porosity of 24%, gas permeability of 0.06 pm / m mm water column. hour, cast iron resistance 0.47 mg / cm min, slag resistance 0.27 mg / cm min. The known mass after firing has the following properties: 0.78% Volume shrinkage 1.4 g / cm 2 Apparently with a density of 26.2% Porosity Gas permeability 0.1 water meter.hour Cast iron resistance 0.98 m g / cm 2 min Slag resistance 0 44 mg / cm 2 min. The proposed refractory mass makes it possible to exclude the spontaneous release of the guna from the blast furnace, to maintain the constant shape of the casting hole, and to increase the durability of the case and its flight 4-5 times. Chemical composition, %