SU1041579A1 - Mixture for desulfuring ferrous metals - Google Patents

Abstract

1. MIXTURE FOR DESULPTION OF FERROUS METALS, including nepheline-containing material and iron oxides that is different. in order to increase the reactivity of slagKa, as well as to improve the mechanical properties and impact toughness of the metal, it additionally contains limestone and cryolite in the following ratio of components, in May.%: Non-reflux-containing matter - 35-52 Known for 38-52 Iron oxides 3-8 Cryolite 5- 7 2. Mixture POP.1, characterized in that, it contains nepheline sludge as nepheline-containing material.

Description

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The invention relates to metallurgy, in particular to the treatment of ferrous metals by sludge, and {Zafiniuyi and complex mixtures, and can be used in the foundry industry, in ferrous metallurgy in the smelting of steel and iron. The known mixture for the processing and refining of ferrous metals, which contains limestone, sylvinite, calcined lime and nepheline at different ratios of components with Si and l. . The disadvantage of the mixture is that it provides a heat-absorbing slag slag within 1680-1790 ° C, as a result of which there is a significant overheating of the metal with the required liquid mobility of the slag, which entails an increase in the carbon monoxide. At such a high melting point, the slag activity is low and insufficiently absorbing the effect on the melt. Moreover, this mixture should be used only in electric arc and open-hearth furnaces, where the slag temperature is higher than the melt temperature. Closest to the proposed technical essence and the achieved result is a mixture for desulfurization of ferrous metals containing nepheline ore and iron oxides in the following ratio of components, in May.%: Nepheline ore 95-98 Iron oxides 2-5 2J. The melting point of a known mixture lies in the temperature range of the mixture, which is around 1420-1510 ° C, which expands its scope. However, such a mixture is also advisable to use in arc and open-hearth furnaces where the slag temperature is higher than that of the melt and its activity is greatest. The use of this mixture in induction furnaces does not lead to sufficient desulfurization and refining of the metal due to the fact that it was cold and inactive. The purpose of the invention is to increase the reactivity of the slag, increase the mechanical properties and impact strength of the metal. This goal is achieved by the fact that the known mixture containing nepheline-containing material and iron oxides, additionally contains known and cryolite in the following ratio of components. May.%: Nepheline containing material 35-52 Known for 38-52 Iron oxides 3-8 Cryolite5-7 Mixture as Mefelin-containing material may contain production wastes - nepheline sludge, containing-. AljOi, 310l, FeO, FejO,. Nepheline sludge is introduced into the mixture as the main slag-forming component, which has a high desulfurization ability. The presence of oxides such as KjO and NasO in the amount of IS in its composition, 7%, makes it possible to increase the activity of the Baltic herring, which remains so for almost the entire smelting time. Simultaneously with an increase in slag activity, these oxides reduce the melting point of the slag. The use of nepheline sludge in an amount of 35-52% in the mixture is justified by the fact that, with an increased content of nepheline sludge (over 52%), it leads to a decrease in the basicity of the slag, and in an amount less than 35% it sharply reduces the slag activity while increasing its melting temperature entails limiting its use and increasing melt processing costs to achieve the same effect. The introduction of 38–52% limestone into the composition of the mixture allows obtaining slag basicity of about 1.5–1.7 npfti 3–8% of iron oxides and increasing the liquid mobility of the slag. The presence of a mixture of cryolite () in an amount of 5-7% makes it possible to reduce the melting point, to increase its reactivity, which intensifies the process of melt desulfurization. The release of fluorine from cryolite additionally refines the melt from non-metallic inclusions. The melting point of the proposed mixture is 5 in the range of 12801360 0, which makes it possible to use the mixture not only in electric arc and open-hearth furnaces, but also in induction melting units for the smelting of steel, as well as cast iron. Table 1 shows the compositions of the mixtures that process the melt. This & l.2 presents comparative data on the results of melting steel 45L in an induction furnace with the use of the mixture being compared with the known and melted slag processing. From Table 2, it can be seen that when using the slag mixture in the proposed content range of the components, the steel has the highest strength properties and impact strength. Extensive use of the proposed mixture for the treatment of molten black metals during their smelting. in inuction furnaces it allows to increase

the quality of the castings, their fissure. The proposed mixture can be successfully used in smelting in other types of furnaces. .

The economic effect due to the use of cheap production waste will be 1 rub. on 1t. liquid metal.

Table 1

table 2

Claims (2)

. 1. MIXTURE FOR DESULFURATION OF BLACK METALS, including nepheline-containing material and iron oxides, characterized in that, in order to increase the reactivity of slag, as well as to increase the mechanical properties and impact strength of the metal, it additionally contains limestone and cryolite in the following ratio of components, May. %: Nepheline-containing material 35-52 Limestone38-52 Iron Acids 3-8 Cryolite 5-7 2. A mixture of pop. 1, characterized in that, as' nepheline-containing material, it contains nepheline sludge.