SU1666566A1 - Method of conditioning slags for silicomanganese production - Google Patents

Abstract

This invention relates to ferrous metallurgy, specifically to the production of silicomanganese. The purpose of the invention is to reduce the consumption of manganese ore raw materials, to stabilize the granulometric composition of the charge materials. The method consists in pouring low-phosphorous slag MFSH into a ladle with a ferromanganese spack with more than 99 basicity to ensure the basicity of the slag mixture in the range of 0.27 ... 0.9. Slag ferromanganese use the following composition, wt.%: MNO 12 ... 15

CAO 30 ... 40

SIO ₂ 30 - 40

MNO 3 - 5

FEO - the rest. The use of a mixture of ferromanganese slag and MFSH allowed us to stabilize the granulometric composition of the charge materials, reduce the consumption of sinter by 81 kg / ton of silicomanganese, and reduce the phosphorus content in the alloy from 0.55 to 0.35%. 1 hp ff, 1 tab.

Description

The invention relates to ferrous metallurgy and specifically to the production of silica-manganese.

The aim of the invention is to reduce the consumption of manganese ore raw materials, to stabilize the granulometric composition of the charge materials.

The method consists in pouring low-phosphorus MFS slag into the ladle with conversion manganese-containing slag with a basicity greater than 0.9. To ensure the basicity of the slag mixture in the range of 0.27 ... 0.9, Ferromanganese slag of the following composition is used as the manganese-containing slag, %: 12 ... 15 MpO; 30 ... 40 CaO; 30-40 S10; 3-5 MgO, FeO - the rest.

MFSH is poured into a ladle with ferromanganese slag. Such a sequence is caused by the fact that a hotter slag must be at the bottom of the bucket. Otherwise, the cold one would freeze to the bottom, reducing productivity and worsening the service of the buckets.

Studies have shown that manganese-containing slag does not scatter when the basicity is less than 0.9. This is due to the fact that, up to the basicity of 0.9 (the effect of MgO) in the melt there are mainly strong calcium silicates of the CaO-SI02 type. With a basicity above 0.9, free CaO begins to combine into less durable CaO MnO type compounds, reducing the degree of manganese recovery.

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A mixture of ferromanganese slag and MFSH in a ratio of 1: 3 after casting and crushing to a fraction of 25-80 mm was used for smelting marketable silicomanganese in the RPZ-48 furnace. When the ratio of ferromanganese slag to the MFSH was greater than 1: 2, the viscosity of the first slag increased rapidly and it did not spread well. The ratio of less than 1: 3 did not allow to completely utilize the whole slag of the ferromanganese.

PRI me R. In the RPG-48 ore mining and extraction center, the ferromanganese bezuglerododisty is smelted. The melt is discharged every 2 hours into a three-bucket cascade. In a ladle filled 1/3 with ferromanganese slag with a basicity of 1.15, the MSF with a basicity of 0.27 is melted in a ratio of 1: 3. The resulting mixture is poured and crushed to a particle size of 25-80 mm, and then, mixed with other charge materials, is loaded into the RPZ-48 ore recovery furnace, where silicon-manganese is obtained.

Approximate composition of the charge according to the offer and technology, kg;

Agglomerate from a mixture of I and And grades 800 Manganese concentrate1060

A mixture of ferromanganese slag with low-phosphorus slag400

Coking, 490

Quartzite470

Dolomit125

/ Zl of receiving 1 ton of standard silicomanganese needed to be spent, kg: Agglomerate from a mixture of Grade I and II 10.25 Manganese concentrate 1 with 946 Quartzite470

Coxica (dry) 486

Dolomite171

Ferromanganese slag, due to high basicity after casting, self-destructs, which makes it unsuitable when turned on as charge materials for smelting and leads to pollution of the environment, creates difficulties in storage.

The composition of the slags used as charge materials. Is given in the table,

Low-phosphorus slag (MFSH) is released from the furnace at a lower temperature (1,450 ° C) than ferromanganese slag (1560-1580 ° C). Therefore, the FSM has a higher viscosity than ferromanganese slag. This determines the order in which the slag is poured into the ladle when mixed.

As tests have shown, manganese-containing slag does not crumble with a core less than 0.9.

Mixing liquid slags to reduce their basicity allows:

increase the temperature of the less heated slag, which improves its casting; 0 has a basic slag mixture of less than 0.9;

to use in smelting rich MnO and CaO slags;

reduce the consumption of manganese and CaO containing batch components.

When slags are mixed, the main controlled parameter is the fluidity of the slag mixture (temperature) for the possibility of pouring them on a casting machine. With an increase in the basicity of a mixture of 0, its temperature should increase.

To maintain the necessary fluidity, the slag mixture (temperatures) control the ratio of the slags to be mixed.

Depending on the basicity, the temperature of the mixture should be in the range of 1280-1350 ° C.

The use of a mixture of slag for smelting

silico manganese reduces consumption

manganese-containing raw materials (agglomerate)

0 to 81 kg, to get a standard alloy

phosphorus (0.35, instead of 0.55%).

Claims (2)

1. A method for preparing waste slag for smelting silicomanganese, including discharging melts into a ladle, separating slag from metal, casting and crushing slags to the optimum size for its remelting, characterized in that In order to reduce the consumption of manganese ore raw materials, stabilize the granulometric composition of the charge materials, a small amount of phosphorous slag in the amount providing the basicity of the slag mixture in the range of 0.27 ... 0.9 is poured into the ladle with basic manganese-containing slag with basicity more than 0.9. 2. A method according to claim 1, characterized in that as a manganese-containing 0 slag use ferromanganese slag of the following composition, wt.%: MpO 12-15; CaO 30-40; SiOa 30-40; MgO 3-5; FeO - the rest.