SU1281592A1 - Mixture for treatment of molten metal outside furnace - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular to the compositions of the mixtures used to process iron-carbon alloys in ladles. The purpose of the invention is to increase the refining capacity of the mixture and reduce the cost of processing the liquid metal by reducing the viscosity of the resulting slag and using liquid final steelmaking slag. The mixture contains, wt.%: Aluminum 5-10, lime 5-10, fluorspar 2-10, turnaround mixture of graphitization furnaces 2-5, liquid finite steelmaking slag - the rest. Reducing the viscosity of the refining slag is provided by the addition of fluorspar to the mixture, and the use of liquid final steelmaking slag and the recycle blend of graphitization furnaces reduces the material costs of processing the liquid metal. 2 tab. from the next

Description

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The invention relates to metallurgy, in particular to compositions of mixtures used to treat iron-carbon alloys in ladles.

The purpose of the invention is to increase the refining capacity of the mixture and reduce processing costs.

According to the invention, aluminum is used in the composition of the ingots or screenings of aluminum shavings.

As liquid final stacking slag, slags from hearth furnaces or converters are used.

.1 shows the composition of the proposed mixture.

Table 1

Ingredients

Content, wt.%

in a mix20

86

75

65

Slag viscosity

at,

Pas 0.15 0.12 0.10

Content,% sulfur in metal:

before processing 0.044 0.044 0.039

after treatment 0.014 0.013 0.012

Quantity, pieces / mm of thin section, non-metallic inclusions in steel:

oxides before processing 54 8

after processing22 1

sulphides before treatment 25 22 27

after processing6 49 Processing costs, rubles / t 1.24 1.62 1.67

Before discharging the melt, a mixture of sifting aluminum chips, lime, fluorspar and graphitization charge in the proportions indicated in Table 1 is loaded into a ladle-reactor heated to 600 ° C.

The final slag of open-hearth smelting is poured into the heated slag-like mixture, the latter interacting with reducing agents and slag-forming for 15–20 min. The slag temperature as a result of the reduction reactions is increased by 30-40 ° C. The associated metal, containing about 5% silicon and 12-15% Mn, is separated from the refining slag, and the slag is poured into an alloy bucket with a melting output in an amount of 4% by weight of the metal.

Table 2 presents the properties of the slag melts of the mixtures and the results of their treatment in the ladle of steels of two grades.

As follows from the data of Table 2, the reduced viscosities of the refining slags from the proposed mixtures contribute to sushi, a natural decrease in the sulfur content and nonmetallic inclusions in steel treated in the ladle with these mixtures, and the use of a liquid final steel-correct slag to prepare a mixture insignificant costs for the processing of liquid metal.

Formula of invention

The mixture for secondary treatment of liquid metal, including aluminum, lime, fluorspar, steelmaking slag, is characterized in that, in order to increase the refining capacity of the mixture and reduce processing costs, the mixture additionally contains recyclable mixture of graphitization furnaces, and as steelmaking slag - liquid final steelmaking slag in the following ratio of ingredients, wt.%:

31281592 4

Aluminum 5-10 graphitization 2-5

Lime 5-10 Liquid end

Fluorspar2-10 Smelting

Slag turnover mixture

Claims (1)

The formula of the invention as a result of reduction reactions increases by 30-40 ° C. The associated metal, containing about 5% silicon and 12-15% Mp, is separated from the refining slag, and the slag is poured into the steel pouring ladle when smelting is released in an amount of 4% by weight of the metal. Table 2 presents the properties of slag melts of mixtures and the results of their processing in a ladle of two steel A mixture for the out-of-furnace treatment of liquid metal, including aluminum, lime, fluorspar, steelmaking slag, characterized in that, in order to increase the refining ability of the mixture and reduce processing costs, the mixture additionally contains a reverse charge of 55 graphitization furnaces, and as a steelmaking slag - liquid final steelmaking slag during the following grades. the total ratio of ingredients, wt.%: Aluminum 5-10 graphitization furnaces 2-5 Lime 5-10 Liquid final Fluorspar 2-10 steelmaking Reverse charge slag Rest