SU1666567A1 - Charge for producing silicomanganese - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used for the production of ferroalloys, specifically for the smelting of silicomanganese. The aim of the invention is to reduce the consumption of manganese raw materials, increase the extraction of manganese and silicon in the alloy and the productivity of the furnace. The mixture for smelting silicomanganese contains, wt%: manganese-containing briquettes 50 - 53

slag medium carbon ferromanganese 20-24

quartzite 10 - 12 and coking 14 - 17. At the same time, manganese-containing briquettes contain, by weight%, manganese concentrate of III grade 60 - 65

manganese dust filters ferroalloy furnaces 25 - 28

elimination of metal concentrate 4–8 and sulfite alcohol bard 4–6. Using the mixture reduces the consumption of manganese raw materials by 8%, increases the extraction of manganese and silicon, respectively, by 2 and 4.5% and increases the productivity of the furnace by 10%. 1 hp ff, 3 tab.

Description

The invention relates to ferrous metallurgy and can be used for the production of ferroalloys, specifically for the smelting of silicomanganese.

The aim of the invention is to reduce the consumption of manganese raw materials, increase the extraction of manganese and silicon in the alloy and the productivity of the furnace.

The mixture for making silicomanganese contains manganese-containing briquettes, medium carbon ferromanganese slag, quartzite and toxic in the following ratio of components, wt.%.

Manganese-containing briquettes 50-53

Medium-carbon ferromanganese slag20-24

Quartzite10-12

Koksik14-17

When this briquettes have the following composition, wt.%:

Manganese concentrate II (grades 60-65

Manganese dust from ferroalloy furnace filters25-28

Elimination of the metal concentrate 4-8 Sulfite-alcohol bard 4-6 In the production of silico-manganese, the waste of the ferroalloy production until now is cakes, which are selected from the buckets and exported with the rest of the slag to the slag storage facility. These cakes contain metalos OsO

ate

ON VJ

la silicomanganese entangled in the slag. In order to extract metal from cake layers, pneumatic separator installations of the specified cake layers were constructed and put into operation, in which they are crushed and enriched by pneumo separation. Three products are obtained: metal-metal concentrate, slag, which is shipped to construction organizations, and screening of metal concentrate, currently does not find application. The resulting screening of the metal concentrate is dispersed and contains small metal particles that are formed during crushing, so the resulting product is heavier than the slag. This difference in weight and content in the sifting of the metal concentrate of such components as Mn, SlOa, CaO, AlzOa, MgO made it possible to use it in a mixture of silicomanganese.

Elimination of the metal concentrate dispersed material and its use in the mixture is possible only after agglomeration; therefore, it is briquetted together with manganese raw materials and manganese-containing dust from filters of ferroalloy furnaces. The addition of metal concentrate sifting helps to obtain strong and heavy briquettes. These briquettes have a comparatively greater mass than the known briquettes to enter the reaction zone faster, which improves the thermodynamic and kinetic conditions for the reduction of manganese and silicon. In addition, briquettes with sifting of the metal concentrate in the reduction zone retain their strength, since sifting of the metal concentrate at high temperatures forms cells that retain the entire mass of the briquette, which also has a positive effect on the recovery of manganese and silicon.

Thus, the use of metaconcentrate in the mine of silicomanganese will allow to increase the extraction of manganese and silicon, as well as the productivity of the unit and to reduce the consumption of manganese raw materials.

A comparative melting of silico-manganese from the proposed charge and the known charge in the ore recovery electrical furnace with a power of 100 kW was carried out.

The known charge contains manganese-containing raw materials from 50% of briquettes containing slag of medium-carbon ferromanganese of small fraction (0-6 mm) and manganese-containing dust of ferroalloy furnaces and 50% of large (+8 mm) slag of medium carbon ferromanganese. As a silica-containing material

quartzite was used, and the Khoksik was used as a carbonaceous reductant.

The proposed charge has briquettes containing manganese concentrate III

grades, sifting of metal concentrate, manganese-containing dust from filters of ferroalloy furnaces and sulphate-alcohol bard, except for briquettes containing quartzite, carbon reducing agent, carbon-ferromanganese slag.

Table 1 shows the chemical compositions of the used charge materials, and Table 2 shows the composition of the mixtures for smelting manganese silicate, as well as the main indicators of smelting manganese silicate in a 100 kW furnace.

The composition of the proposed manganese-containing briquettes-2 is a new composition and the substantiation of the limits of the components in them was carried out by experimental verification. Experimental melting with the use of manganese-containing briquettes-2 - of variable composition was performed on the charge No. 4.

The results are shown in Table. 3

The proposed mixture for smelting silicomanganese, in comparison with the known, allows to increase the extraction of manganese and silicon, respectively, by 2 and 4.5%, to reduce the consumption of manganese raw materials by 8%, and the furnace productivity increases 1.1 times.

Claims (2)

Claim 1. Batch for melting silicomanganese, containing quartzite, coking, slag of medium-carbon ferromanganese v manganese-containing briquettes, characterized in that, in order to reduce the consumption of manganese raw material, increase the extraction of manganese and silicon in the alloy of furnace productivity, it contains components in the following ratio, wt. .%: Quartzite10-12 Koksik14-17 Manganese-containing briquettes 50-53 Slag of medium carbon ferromanganese20-24 2. The mixture according to claim 1, characterized in that the manganese-containing briquettes have the following composition, wt.%: Manganese concentrate III grade 60-65 Manganese-containing dust from filters of ferroalloy furnaces 25-28 Screening of metal concentrate 4-8 Sulfite-alcohol bard4-6, Table 1 38.0 18.0 5.5 Technical analysis of coke: ash, 10.5%, n Bj "- 1.8% moisture - 10%, series "- 1.5%  manganese-containing briquette-1 - known briquettes, composition, wt%: slag medium carbon ferromanganese 66; manganese-containing dust 28; sulphite-alcohol bard 6, 4.3 1.5 3.0 0.5 0.16 table 2 59.7 60.0 62.5 65.0 65.4 28.3 28.0 26.5 25.0 24.6 Table 3 3.6 4.0 5.0 6.0 6.2 72.2 74.3 72.5 74.0 71.6 40.6 43.5 44.0 43.7 41.0