SU1761811A1 - Method for baking sulfur-containing charge - Google Patents

Abstract

Use: preparation of iron ore raw materials, namely sintering of metallurgical raw materials by the method of agglomeration. Essence: during agglomeration of iron ore materials containing sulphate and sulphidic sulfur, a borecontaining material is introduced into the mixture, and for each% increase in the content of barium sulphate in the mixture, within 1-6%, the content of boron oxide in the mixture increases by 0.1%, starting with 0.3%. 1 tab.

Description

The invention relates to the field of preparation of iron ore raw materials in ferrous metallurgy, namely, to the area of agglomeration agglomeration of metallurgical raw materials.

There is a method of sintering iron ores with the introduction into the mixture of boron-containing materials in the amount of 0.5-1.5% of the weight of the ore part of the components of the mixture ). The disadvantage of this method is the lack of a rational choice of the ratio between the boron oxide content and the VAZO content, which has a significant effect on the degree of sulfur removal.

The prototype is based on the method of agglomeration of atasuisky ores mixed with Sokolovskiy ore (see Nam tov GN, Feschenko II, Glovatsky AB. Removal of sulphide and sulphate sulfur during sintering of iron ore, Steel, 1965, no. 11, pp. 974-976).

The disadvantage of this method is the low degree of sulfur removal, which is associated with various conditions for the removal of sulfate and sulfide sulfur. The limiting element in the sulfur removal process is the decomposition of barium sulfate. The temperature increase in the layer, which promotes the removal of sulfate sulfur, is limited by the conditions for the removal of sulfide sulfur and the melting of the agglomerate.

The aim of the proposed invention is to reduce the sulfur content in the resulting agglomerate while maintaining its strength.

This goal is achieved by the fact that during the agglomeration of iron ore materials containing sulfate (BaS04) and sulfide sulfur, 0.3% may be introduced into the mixture. boron oxide, while increasing its content by 0.1% for each percentage increase in the content of barium sulphate in the charge in the range of 1-6 wt.%.

Compliance with this ratio provides favorable conditions for

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removal of sulfate sulfur by lowering the temperature of the beginning of the intensive decomposition of BaSCk without worsening the condition of removing sulfide sulfur.

The addition of BaOZ below or above the specified limit leads to a decrease in the degree of sulfur removal. In the first case, due to an insufficient decrease in the decomposition temperature of VAZOz, and in the second, due to the melting of the agglomerate, which makes it difficult to remove the reaction products.

The processing of ores containing more than 6% of BaSCM is limited by the deterioration of the blast furnace slag regime.

An example of a specific implementation of the proposed method of sintering sulphurous ores.

The sintering of the sintering mixture was performed on a laboratory sintering pan with a diameter of 250 mm with a constant decomposition of 900 mm of water under the grate. Art. The composition of the charge included atasuysk ore with a particle size of 0-8 mm (52.4% Fe; 14.7% Si02; 0.8% CaO; 50bg - 0.58%). Known to (53.75% CaO; 1.39% SiOa; additive-powders VAZSm, boric anhydride brand H.C. and coke fines. Were obtained fluxed agglomerates with basicity CaO / Si02 1.15. The content of VAZSm was changed from 1 to 6 , 0%. The results of sintering are given in the table.

Example. Atayu ores mixed with Sokolovskys were tested by a known method (option 1) and the proposed method with BaSCU content in the iron ore portion of charge 1, 3, and 6% (option 3, 6, 9). The degree of sulfur removal in the proposed method has increased compared to the known by 5-8% (abs.).

With a higher or lower BaOZ content in the charge, the degree of sulfur removal decreases (option 2, 4, 5, 7, 8, 10).

Thus, the proposed technical solution is realized only if the stated ratio in the charge between the content of BaS04 and BaOz is observed.

Sokolovska ore (55.6% Fe; 3.7% CaO; 8.8% SiOa; 0.82% 80bg).

Claims (1)

Invention Formula A method of sintering sulfurous charges consisting of iron ore components containing sulphate sulfur in the form of barium sulphate and sulphide sulfur, including preparation of the charge and sintering thereof, characterized in that, in order to reduce the sulfur content in the obtained agglomerate while maintaining its strength, The mixture is introduced with 0.3 wt.% boron oxide, while increasing its content by 0.1% for each percent increase in the content of sulfuric acid in the charge in the range of 1-6 wt.%.