SU1694677A1 - Method of melting ferromanganese - Google Patents

Abstract

The invention relates to metallurgy, specifically to ferroalloy production, and can be used in the smelting of ferromanganese. The aim of the invention is to reduce the specific energy consumption. In the smelting process, the ratio of the distance between the axes of the paired electrodes to the distance from the lower ends of the electrodes to the metal level in the bath is maintained at 1.94-3.3. Due to a more uniform distribution of thermal power in the reaction zone of the furnace, reducing the loss of manganese, the specific energy consumption is reduced by 6.0-6.5% and the ratio of slag to metal from 1.6 to 1.2 compared with the known. 1 tab., 1 Il.

Description

-g

Yo

The invention relates to metallurgy, specifically to ferroalloy production, and can be used in the smelting of ferromanganese.

The aim of the invention is to reduce the specific energy consumption.

According to the invention, during the smelting process, the ratio of the distance between the axes of the paired electrodes to the distance from the lower ends of the electrodes to the metal level in the bath L / h0 is equal to 1.94-3.3. While maintaining the ratio less than 1.94, the hot zones move to the higher horizons of the furnace bath, which leads to early slagging, reduced extraction of the driving elements, increased power consumption, slag viscosity, and difficulties in melt production from the furnace. When L / h0 is more than 3.3, the volume of the reaction zone decreases, the manganese flyoff rises, which leads to an increase in specific energy consumption and a decrease in the productivity of the plant.

The drawing shows the implementation of the proposed method.

about

A rectangular electric furnace of the RPZ-48 type with six rectangular electrodes 1 arranged in-line and connected in pairs to single-phase transformers 2 with a power of 21 MVA, a comparative analysis of the technical and economic indicators of SMP smelting of ferromanganese was carried out. 17 at different ratios of the interelectrode distance in phases L to the distance from the lower ends of the electrodes to the metal level in the furnace after the melt is released h0 (I is the distance between the pairs of electrodes).

Os

h

four

СЬ VJ

VI

For the known furnace of the type RPZ-48 L it is equal to 3300 mm, I-3000 mm.

The transformer power was equal to 44 MVD, 10 kbs 82 kA, U 210 V.

In the furnace, covered with casing 3 with lining 4, and from the top, vault 5, blend materials were supplied by tube 6 based on 1 ton of melted metal, kg:

Agglomerate B-12100

Koksik400

Known to 800

Iron ore pellets110

Through the contact cheeks 7, a voltage of 220 V was applied to the electrodes 1 while maintaining the ratio I / U equal to 390.

The optimal ratio L / ho was determined by the difference in the height of the furnace bath, equal to 4250 mm, and the height of the charged part of the electrode hi, which was determined by probing and other methods. The ratio L / ho determines the ratio of the current la, which branches off at the bottom of the furnace (metal melt), and the current And flowing through the coke layer on the slag surface.

The data of the experimental heats are presented in the table.

The tests carried out showed that the choice of the ratio of the distance between the vertical axes of the electrodes of one phase to the distance between their lower ends and the level of the metal after the melt was released (the level of the bore holes) equal to 1.94-3.3 reduces the specific consumption

electricity 6-6.5% and reduce the rate of slag to metal from 1.6 to 1.2.

The optimal mode is the No. 3 series, in which the electric power consumption is equal to 4,100 kWh / t of alloy with a slag ratio of 1.2.

As the metal in the bath 2 was directed, the distance h0 decreased and, in order to maintain optimal ratios of the currents 12 and I, the electrodes were raised to a height equal to the height of the deposited metal hz.

In this way, the optimality of the selected relations was maintained.

Claims (1)

Invention Formula The method of smelting ferromanganese predominantly in a rectangular ore-making furnace with pairs of electrodes arranged in a row and their individual connection to transformers, including loading charge materials into the furnace bath, melting the alloy with maintaining the electric and thermal field of the reaction space, adjusting the ratio of the electrode electrode to distance from the metal level to the lower ends of the electrodes and their movement, the release of the melt from the furnace, characterized in that, in order to reduce the specific the course of electric power, the ratio of the distances between the axes of the paired electrodes to the distances from the lower ends of the electrodes to the level of the metal in the bath is maintained at 1.94-3.3.