SU1657539A1 - Method of producing manganese ferroalloys - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the smelting of manganese ferroalloys in ore-smelting furnaces. The purpose of the invention is to reduce manganese burnout and energy consumption, increase furnace productivity. New is that coke is charged to residues of unmelted charge in an amount of 10-50% of its mass, which is necessary to recover elements from the charge, and the rest is coke. before melting it. The method makes it possible to reduce the waste of the charge / increase the productivity of the furnace, reduce energy consumption, and reduce the specific consumption of coke. 1 tab

Description

The invention relates to ferrous metallurgy, in particular to the smelting of manganese ferroalloys in ore-smelting furnaces.

The aim of the invention is to reduce manganese burnout and energy consumption, to increase the productivity of the furnace.

The method consists in that the coke for the residues of the unmelted charge is loaded in the amount of 10-50% of its mass, necessary for the recovery of elements from the charge, and the rest of the coke is introduced into the composition of the charge before it is melted.

Loading into the furnace on the remnants of the unmelted charge of the preceding coke smelting in the amount of 10-50% of the total coke mass necessary to restore the leading elements from the subsequent smelting charge makes it possible to form a coke layer in the furnace and thereby increase the contact surface of the coke with the melting mixture . In addition, it allows to reduce the amount of coke in the furnace and reduce its combustion due to the oxygen of the air.

The lower and upper limits of the amount of coke extracted from the charge and loaded into the furnace are determined empirically. The upper limit (50%) limits the area of increase in the thickness of the coke layer, resulting in a decrease in the extraction of the driving elements. The lower limit (10%) limits the minimum thickness of the coke layer in the furnace, less than which the extraction of the driving elements from the slag begins to decrease sharply.

Continuous loading and penetration of the charge, containing 50-90% of coke on the amount needed to restore the leading elements from the current smelting charge, allows to conduct smelting at higher power (high voltage), with a deep fit of the electrodes and, as a result, increase productivity furnace and extraction of the leading elements

WITH/

with

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h

oh h

The upper and lower limits of the amount of coke contained in the charge are determined by calculation. At the same time, the sum of the mass of coke removed from the charge and loaded separately, and the mass of coke remaining in the charge, is 100% of the mass needed to restore the leading elements from the charge / melt mixture. For example, 30% of coke is removed from the charge and charged separately into the furnace. Then, the amount of coke loaded with the charge is 70%.

PRI me R. In a 1600 kVA ore-smelting furnace, manganese silicate is smelted. The mixture consists of manganese sinter (69.4%), quartzite (13.3%) and coke (17.3%). 1690 kg of charge are used for melting. 10-50% of coke (24-120 kg) is extracted from the charge and loaded onto the remnants of the unmelted charge of the preceding smelting. Then, a charge containing 50-90% coke (120-216 kg) is continuously charged and smelted. Melting products are released after coke loading.

For comparison, melting is carried out by a known method. Coke is loaded under one

electrode, and the charge without coke - under the other two electrodes. Indicators of heats are shown in the table.

As follows from the table, the method allows reducing the waste of charge by 4.3–5.5%, increasing the furnace productivity by 0.28–0.46 b-t / day, and reducing the power consumption by 130–220 kWh / t alloy, reduce the specific consumption of coke by 21-26 kg / t.

Claims (1)

Claims method of smelting manganese ferroalloys, including alternating charging of coke and charge to non-melted residues in the furnace, melting and periodically releasing the melt from the furnace, characterized in that, in order to reduce the manganese burnout and energy consumption, to increase furnace productivity, the coke to the remains of unmelted melts 10-50% of its mass is required to recover the elements, and the rest of the coke is introduced into the composition of the mixture before it is melted.