SU1477509A1 - Slag-forming constituent mixture - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular, to compositions of slag-forming thermal insulation mixtures used for warming a metal mirror during its transportation in a cast-iron ladle. The purpose of the invention is to reduce the loss of iron with slag and reduce overgrowth of the bucket neck - achieved using a slag-forming mixture containing, in wt.%: Abrasive production waste 5-50

spent coal lining of aluminum electrolysis cells 50-95. As a result of the interaction of the mixture with the blast-furnace slag, a liquid-mobile heat-insulating slag layer is formed, which has a lower thermal conductivity and viscosity. Due to this, the heat loss through the metal mirror is reduced, the iron content in the slag is reduced to 20-32%, and the overgrowth of the neck of the cast iron dipper is reduced. Mix consumption - 2-5 kg / t of pig iron. 3 hp f-ly, 2 tab.

Description

one

The invention relates to the field of metallurgy, namely to compositions of silt-forming mixtures used for warming a metal mirror during its transportation in a cast iron ladle.

The aim of the invention is to reduce losses of iron with slag and reduce overgrowth of the bucket neck.

Table 1 shows examples of the composition of the proposed slag-forming mixture.

The mixture, made by mechanical mixing of the components crushed to the desired fractions, is fed to the bottom of the cast iron ladle before starting.

cast iron drain. In the process of filling the ladle, the low-melting components of the mixture are melted and they interact with the blast-furnace slag to form a liquid-mobile insulating layer in which the refractory components of the mixture are uniformly distributed (silicon carbide, graphite).

Table 2 presents the properties of the product of the interaction of the slag-forming mixture with the blast-furnace slag, as well as the results of using the proposed mixture.

As follows from Table 2, as a result of lower viscosity values

1 1 1

cl

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and the thermal conductivity of the heat insulating coating formed on the surface of the cast iron in the ladle, reduces heat loss, which provides a small amount of metal in the galaxy and minimal overgrowth of mountains. halovoy chugovoznogo bucket. Mixture consumption 2-5 kg / t of pig iron.

Claims (4)

1. Slag-forming mixture, predominantly for insulated metal mirrors during iron transportation in a cast-iron ladle, including carbon-containing and fluorine-containing materials, which in order to reduce losses of iron with slag and reduce overgrowth of the neck of the bucket, the mixture contains carbonaceous material abrasive production, and as a fluorine-containing material - spent coal lining of aluminum electrolysis cells in the following ratio of ingredients, wt.%: 0 Abrasive production waste 5-50 Waste coal cutting aluminum electrolysis cells 50-95 2. The mixture according to claim 1, about tlitch a rant and the fact that the waste abrasive production contain, wt.%: Graphite 60-75 Carbide silicon 5 - 20 Ash10 - 20 3. A mixture of PP. 1 and 2, characterized in that the spent coal lining of aluminum electrolysis cells contains, in wt%: 0 five Carbon Silica Alumina sodium thoride Calcium oxide Sulfur 20 - 30 10-20 10-30 10-20 5-15 0.1-0.4 4. A mixture of PP. 1-3, characterized in that the ingredients have a fraction of 0.1-10.0 mm. IT a b l and c a 1 Waste abrasive production Waste coal lining of aluminum The viscosity of the blast furnace slag after the mixture is applied, Pz. Heat conductivity coefficient of the heat insulating coating, W / m ° C. The rate of decrease in the temperature of the cast iron, ° C / min The iron content in the blast furnace slag,% Overgrowing (narrowing) of the neck of the cast iron ladle, mm 20 40 50 0.56 0.56 0.58 0.60 0,150,140,140,13 0.3-0.3-0.20-0.30, 40,40,350,4 20-2821-3024-2826-32 15-26 18-30 24-37 25-36