SU1468945A1 - Method of producing sinter cake with residual carbon - Google Patents

Abstract

The invention relates to the field of preparation of charge materials for metallurgical processing and can be used in ferrous and non-ferrous metallurgy during their agglomeration. The aim of the invention is to add 1 The invention relates to the preparation of charge materials for metallurgy. redistribution and can be used in ferrous and nonferrous metallurgy during their agglomeration. The purpose of the invention is to increase the efficiency of carbon use in the charge. The essence of the method lies in the fact that a large fraction of the aglotoplis; VA, which reduces the performance of the agloprocess, is used as centers of carbon utilization efficiency in the charge. When preparing the sintering sinter charge with residual carbon, the fuel is classified on a mechanical screen or pneumatic classifier with a separation of two to three parts according to the boundary grain size of 1.5-3.0 mm. The sublattice part of the fuel in the amount of 3–15% of the mass of the mixture is processed by the fine iron ore component. The resulting pelletizing centers are introduced into the charge and pelletized. From the total charge, 1.5-2.5% by volume is previously deduced from one percent of the injected fuel. The sublattice part of the fuel is introduced into the charge at the end of the pelletizing. The mixture prepared in this way is sintered in the usual way. The unburned fuel rolled into charge is stored as residual carbon. A thin portion of the fuel, rolled on the charge, is used most efficiently. 1 tab. § (The clumping of the charge after it is treated with a fine iron-containing component of the charge. The fine component that is treated with fuel does not additionally add compounds that adversely affect the production of the final product to the mixture, which is a component. Rolled onto the pelletizing centers, the mixture prevents active diffusion oxygen to the fuel particles and their combustion.The optimal amount of knurled mixture of: 00 co (ate

Description

It is possible by removing from the charge a part of its component that is capable of forming charge granules. The unburned fuel rolled into the charge is retained as residual carbon in the formed structure of the agglomerate and is able to enhance its reducing properties in the subsequent metallurgical transformation. A thin fraction of the fuel rolled onto the surface of the charge grains does not negatively influence the behavior of the mixture inside the grains and is used most efficiently.

The method is carried out as follows.

Agglomerative fuel is classified according to the boundary grain size of 1.5-3 mm at the mechanical screen or pneumatic grader. The superlattice product is processed by a fine iron-containing component of the charge, and a layer of this material is formed on its surface. The treatment of fuel and the formation of a layer of material can be performed, for example, on a two-shaft blade mixer or other apparatus in which an active influence on the material is carried out. The resultant crumpling centers are fed to the aggregate. From the aggregate charge, it is preliminarily derived from the required amount of aggregation of its constituent, for example, large fractions of sinter ore or return. The agglomerate is mixed with the resulting crushing centers and the subsequent mixing of the entire charge is carried out in a drum mixer or on a plate granulator.

The sublattice product of agrofuel separation in the amount necessary for sintering the agglomerate is fed into it at the end of the pelletizing process. This can be done by rolling fuel by known methods at the final stage of crumpling.

The resultant so much agglomerates are baked using conventional technology.

Sinter fuels are classified according to a boundary fraction of 1.5-3 mm from those considerations that granules with a diameter of less than 1.5 mm do not have a clodding structure and are not capable of becoming a pelletizing center. However, the use in the fuel mixture of a fraction of more than 3 mm, introduced at the end of its clumping, adversely affects

agloprocess, contributing to the expansion of the combustion zone.

The supply of a fine iron ore component for mixing with fuel and forming crumpling centers in an amount of more than 150% leads to the formation, when mixing the prepared centers, not containing internal fuels. The supply of the same iron-ore component in an amount of less than 50% does not ensure uniform coverage of large fuel particles, does not give them sufficient lumping properties, which make them reliable centers of clumping. As a fine iron ore material, for example, blast-furnace sludge with a moisture content of 20%, steelmaking sludge with a moisture content of 35–40%, sludge aspiration systems at a sintering plant with a moisture content of 20%, and a wet moisture content of 12–13% can be used.

When the superlattice fuel is supplied to the mixture by more than 15%, the charge transfer rate of the charge fuel to the residual carbon of the agglomerate decreases because, due to an excess of the crumpling centers, the layer rolled onto the crumpling centers of the blend is insufficient and does not actively adhere oxygen diffusion to particles fuel. The supply of less than 3% to the mixture of upstream fuel is impractical because the content of residual carbon in the sinter in this case will be low and ineffective. for subsequent redistribution.

For each percent of the superlattice fuel introduced into the charge, charge of 1.5–2.5% (volume) of the crumpling component from the charge occurs because the surface on which the combustible part of the charge is formed must remain constant and optimal for the specific conditions of the process. . When less than 1.5% of the lumping component is introduced into the mixture for each percent of the superlattice fuel introduced into the mixture, the value of the fuel transfer coefficient of the charge into the residual carbon decreases, because, as a result of the excess crumpling centers, the layer of combusted components formed on them is insufficient to resist active diffusion

oxygen to the fuel particles. When more than 2.5% of crumpling material is removed from the charge, each percent of the introduced superlattice fuel is reduced due to the lack of crumpling centers, and the productivity of the sintering unit decreases.

Studies on obtaining sinter with residual carbon were carried out on an experimental sinter plant of the Donetsk Polytechnic Institute with a sintered area of 0.028 m.

Sinter fuel (a mixture of coke breeze and anthracite shtab 1: 1) was classified on a mechanical rumble with openings with diameters of 0.8: 1.5: 3.5: 2.5 and 3 mm.

The treatment of the fuel with a finely divided M component of the charge (steel-smelting ash with a moisture content of 40%; it was carried out in a special mixing tank.

The mixing and pelletizing of the charge was carried out in a drum-hopper, and the sub-grid fuel was introduced into the charge after the completion of the pelletizing process.

A return fraction of 0–5 mm was used as a component of the charge,

The mass of the charge is constant and equal to 18 kg.

The composition of the charge,%:

Agglomeration

fuel6.0-19.5

Steelmaking sludge 1.13-26.4

Aspiration

limestone

dust 5

Return to 27.5

Concentrate TsGOK Else

The results of the experiment are the average of three sintering experiments of the agglomerate.

The specific productivity of the sinter plant and the yield were calculated by a fraction of sinter more than 5 mm.

The results of the experiments for obtaining sinter with residual carbon are given in the table.

The highest results were achieved in a series of experiments 1-3. The conversion ratio of the fuel mixture to the residual carbon of the agglomerate in the proposed method (.0.82) and in the known (0.815) is approximately the same.

The highest value of the charge fuel transfer ratio to the residual carbon of the agglomerate was achieved with 7.4% of residual carbon, which makes it possible to produce more efficient chemicals for the metallurgical industry.

Q redistribution. The proposed method, while maintaining the value of the conversion factor of the fuel to the residual carbon of the agglomerate, increases the absolute value of the residual carbon in the agglomerate by 3.9%.

The close contact of the agglomerate with the residual carbon and on, which are hygienic in the agglomerate of calcium and iron oxides, ensures a high reactivity

0 ability to balance full-time carbon. In the subsequent metallurgical redistribution, the residual carbon is completely assimilated by the metallurgical unit and does not impair the indicators of the subsequent redistribution.

Claims (2)

1. A method of producing sinter with 0 residual carbon, including fuel separation, processing its parts with fine material, then mixing with other components of the charge, pelletizing, rolling necessary for sintering the untreated part of the fuel on the pelletized mixture and sintering To increase the efficiency of carbon utilization of carbon in the charge, the fuel is classified in two parts according to. the grain boundary size is 1.5–3 mm; in the amount of 3–15% of the mass of the mixture, the superlattice part is processed with the fine iron-containing component of the mixture, 50–150% of the solid mass of the treated fuel, and introduced into the agglomerate, and the sublattice part is introduced into the mixers at the end of the pelletizing process. five 0 2. A method according to Claim 1, characterized in that for each percent of the superlattice part of the fuel introduced into the charge, 1.5 to 2.5% by volume of a combining component is extracted from the charge. exact carbon of agglomerate () Specific capacity of the sintering plant, Yield (I-5 mm),% 0.815 0.82 0.82 0.82 0.71 0.75 1.25 1.51 1.52 1.51 1.41 1.40 72.1 80.1 80.1 80.1 78.2 77.9 0.75 MKC is the mass of the lumping component, M is the mass of the rolled fuel. Only carbon rolled in charge is taken into account.