SU1611956A1 - Method of producing fluxed sinter cake - Google Patents

Abstract

The invention relates to the preparation of iron ore to blast furnace smelting and can be used in sintering sinter. The aim of the invention is to increase the strength of the fluted agglomerate and reduce the fuel consumption during its production. Before its primary mixing, a pre-granulated mixture containing AL ₂ O ₃ and MGO in a ratio of 0.1-0.6 and solid fuel in an amount providing 0.5-10% of carbon in the mixture is introduced into the sintering mixture. The basicity of this mixture is 2.5-7. Before granulation, all components of the mixture are crushed together to a particle size of less than 1 mm. When using manganese ore, it is added to the same mixture in an amount that provides a ratio in the SIO ₂ / MNO mixture equal to 2-5. The consumption of the pre-granulated mixture is 30-100% by weight of the required fluxes. The use of the method allows to increase the strength of the agglomerate by 15% and reduce fuel consumption by 8-14%, as well as to increase productivity by up to 30%. 1 hp ff, 2 tab.

Description

The invention relates to the preparation of iron ore for blast furnace smelting and can be used in sintering sinter.

The aim of the invention is to increase the strength of the fluted agglomerate and reduce fuel consumption during its production.

In the production of fluxed agglomerate according to the proposed method, a pre-granulated mixture is introduced into the sintering mixture before its primary mixing and pelletizing, which intensifies the sintering process, improves the structure and quality of the agglomerate. The mixture also contains MgO at a ratio of 0.1-0.6, which is 2-10 times less than in the known method, and solid fuel, the content of which is 0.5-10% (by: 5, pullover). The high MgO content and the development of reduction processes in the granules of the mixture, caused by the presence of carbon, accelerate the formation of low-melting compounds (with a temperature of less than 1185–1250 ° C) as a result of solid-phase reactions, and

ate

but

The melt has a high reactivity with respect to the mineral particles of iron ore, concentrate and return. As a result, almost the entire mass of the a-gloschht passes through a liquid-phase sintering stage.

A distinctive characteristic of the composition of the mixture is a high CaO / SiOj ratio, equal to 2.5-7.0. This makes it possible to significantly increase the proportion of the ferritic binder in the structure of the agglomerate, and, consequently, to increase its strength and regrowth. Thus, the granules of the mixture containing the main pshakoobrazuyushchy oxides in the proposed ratios become centers of melt formation in the bulk of the agglomerate and provide a high degree of crystallization of the batch of the cake. When used in an agglomerate, manganese ore is added to the mixture in an amount that provides a ratio of SiO A-biO of 2.0-5.0. The method is as follows.

in a way.

The components of the mixture containing iron ore with aluminous rock, any kind of flux and solid fuel, are crushed together in an impact crusher to a particle size less than 1 mm and then granulated in any type of pelletizer. The consumption of the components of the pre-granulated mixture provides these ratios, and the consumption of the mixture itself to the remaining part of the sinter blend is 30-100% of the mass of flux required to obtain the agglomerate of a given basicity.

The method is carried out by sintering the fluxed agglomerate in an agglomeration of solid, comprising a pre-granulated mixture.

In tab. 1 shows the chemical composition of the mixture; in tab. 2 - results specanil.

Compositions of mixture 1 and II were prepared with additives of manganese ore, experience 1 - sintering the mixture with the addition of a pre-granulated mixture with a high content of alumina material, in which the ratio is 10 times greater than in the proposed mixture (known method), experience 2 - mixture without an additive granulated mixture.

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The use of a pre-granulated mixture of co-milled components in accordance with the proposed method improves the performance of the sintering process depending on the chemical composition s (tests 3-9), granule size (test 13), solid fuel consumption (tests 14-16), type of flux ( experiments 10-11).

The optimum ratios of the components of the mixture, which ensure the maximum increase in the strength of the agglomerate and the value of fuel economy, are achieved with the following: Al, 0.16, CaO / SiOj 5.5., SiO p / MnO 2.0, the content carbon fuel in a mixture of 5.0% and a mixture consumption of 100% by weight of fluxes required for the charge. Lime is used as flux;

The use of the proposed method will allow to increase the strength of the sinter by 15%, to reduce the consumption of solid fuel for sintering by 8-14% and to increase the productivity of the sintering plant by up to 30%.

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Claims (2)

1. A process for the production of fluxed sinter, including the introduction of a granulated mixture containing CaO, SiO, and MgO into the mixture, followed by mixing and pelletizing with the rest of the mixture, in order to increase the strength of the fluted sinter and reduce fuel consumption during its production, the pre-granulated mixture contains a solid fuel in an amount that provides the carbon content in the mixture of 0.5-10.0%, has a CaO./SiQ,j ratio equal to 2.5-7.0 and equal to 0.1 -0,6, and the mixture consumption composition is 30-100% by weight of the fluxes, and the components together prior to granulation mixture is milled to a particle size less than 1.0 mm. 2. Method of pop, 1, differing from that with the fact that the pre-granulated mixture contains -IftiO in an amount that provides a Si02 / MnO ratio of 2, P-5.0. Table 1