SU1266876A1 - Charge for producing synthetic slag and liquid alloying composition - Google Patents

Abstract

The invention relates to the field of metallurgical production, more precisely to the production of synthetic slags of special composition and liquid master alloys, and is intended for use in the production of manganese-containing steels by mixing liquid precursors with deoxidizing and alloying metals; they are produced in the same smelter together with the synthetic slag. The aim of the invention is to reduce the phosphorus content in a liquid master alloy. In order to achieve the goal, the mixture for producing synthetic slag and liquid master alloy includes, in wt.%: Manganese concentrate 5-30; dump dump aluminum production 15-40; lime and s the rest is 6 tablo

Description

The invention relates to metallurgical production, more precisely to the production of synthetic slags of special composition, and is intended for use in the production of manganese-containing steels by mixing liquid billet with a deoxidizing and alloying alloy produced in the same smelting unit together with synthetic slag. The purpose of the invention is to reduce the phosphorus content in a liquid master alloy. The proposed mixture of dp for obtaining synthetic pshak and liquid ligature contains alumina-containing material, lime manganese concentrate and waste dump of secondary aluminum production in the following ratio of ingredients, wt.%: Margandy kondentrat 5-30 Dump slag of secondary aluminum production 15-40 Lime Total Margande concentrate on THE 14-9-173-79 has a chemical composition presented in table. 1. Used dump slag of secondary aluminum production has a chemical composition, presented in table. 2, In the dump slag of the production of recycled aluminum, aluminum has been found in the form of wrenches. Introduction to the composition of the charge of less than 5% manganese concentrate leads to an increase in lime. The slag becomes empty, immobile, which leads to a decrease in the desulfurizing ability of synthetic slag, the degree of desulfurization does not exceed 30%. With the introduction of more than 30% margand concentrate into the composition of the charge, the alumina content increases in the synthetic putty. In such a slag, the lime content decreases, which drastically reduces the desulfuradiya of the steel being treated. The introduction of less than 15 waste caps in the production of secondary aluminum into the composition of the charge does not ensure complete recovery of the manganese oxide margand because of the insufficient amount of aluminum. With the introduction of more than 40% of the dump production billet of the mountainous apyumini into the synthetic mixture, an excess of aluminum is formed, which does not ensure the stability of the chemical composition of the resulting synthetic slag. Liquid alloying alloy and synthetic slag are prepared in 160 kg of an induction furnace with a combined lining. The lower part of the furnace, where the liquid ligature melts, is lined with magnesite, and the upper part of the furnace, at the melting level of the synthetic shpak, is graphite. The data on the tested compositions of the proposed mixture for the production of synthetic slag and between the alloying alloy are given in Table. 3. Data on the tested compositions of the known slag mixture are given in table. 4. Data on the content of reduced manganese, as well as phosphorus in a liquid master alloy using the proposed mixture for producing synthetic slag and the known slag mixture, are given in Table. 5. In table. 6 shows the data on the composition of the synthetic slag obtained during smelting using the proposed charge. Thus, the use of the proposed mixture can reduce the phosphorus content in the ligature by 2-3 times in comparison with the use of the known mixture. Introduction to the composition of the mixture to obtain synthetic slag during co-smelting with a liquid ligature less than 5% manganese concentrate, although it leads to a decrease in the phosphorus content in the ligature, but does not provide a sufficient manganese content in it. Introduction to the composition of the mixture more than 30% manganese concentrate leads to a decrease in synthetic slag content of lime, which dramatically reduces the refining capacity of slag. The purpose of synthetic slag is to desulphurize steel, mainly due to the presence of lime in it. The use of the proposed mixture reduces the content in the resulting phosphorus ligature liquid compared with the use of the known mixture, which improves the quality of steel

T ab l and c and

Manganese concentrate 43-55 0.7-1.2 7.5-10.5 4.240-65 10

5 2.5

18 9

thirty

15

106

33 16.5

107

table 2

10-15

10-15

15-25 0.3-0.5

Table

50

50

50

50

50

22.5

11 1.6 0.9-1.3 0.2-0.8 0.1-0.3 0.130 Number of heats Manganese3.6 13.3 21.7 2.3 Phosphorus033 0.041 0.052 0, DZO Proposed 118 , 6570,208,101.80 224,761,759,252,40 334,0950,1010,402,72 415,175,676,301.75 534,649,4510,802.65 Known to 28.7 57.93 9.412.90

Table 4

Table 24.7 3.1 4.9 5.8 1.9 5.9 0.056 0.053 0.101 0.114 0.089 0.118 Table 6 0.17 0.63 0.010.520.017 0.23 0.74 0.030.870.035 0.30 0.87 0.051.120.053 0, 16 0.58 0,010,420,016 0,31 0,91 0,051,180,050 O.J9 0.84 0.02 ate. 0.012

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Claims (1)

The claims contain lime in the following The mixture to obtain a synthetic ratio of ingredients, wt.%: slag and liquid master alloys, including manganese con Manganese concentrate and dump centrate 5-30 New Aluminum Slag, 5 Dump Slag characterized in that, aluminum pros for the purpose of reducing the content of phospho-production 15-40 ra in liquid ligature, it will add Lime OcTajrbHoe