SU1252377A1 - Charge for smelting high-carbon ferromanganese - Google Patents

Description

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Invention to ferrous metallurgy, namely to electrometallurgy of ferroalloys, and can be used in the smelting of high-carbon ferromanganese.

The purpose of the invention is to increase the extraction of manganese, the performance of the electric furnace, reducing the specific energy consumption.

The mixture for smelting high-carbon ferromanganese containing manganese raw materials, reducing agent, as fluxing and iron-containing materials, contains fluxed ferromanganese spec.

Manganese raw materials Rest Fluxed ferromanganese sintered has the following chemical composition, wt.%:

Iron3-12

Alumina 1-6 Silica 11-18

Calcium Oxide 27-34 Magnesium Oxide 2-5

Manganese Else

Iron-manganese sinter with a basicity of 1.61-3.54 is introduced into the composition of the charge, which became possible due to the establishment of the thermodynamic and kinetic dependences of the extraction of manganese into the alloy on the basicity of phth and slag.

The use of the charge, which includes iron-manganese sinter basicity (CaO + MgO): SiOj more than 3.54, leads to a violation of the gas and electric modes of operation of an electric furnace due to the deterioration of its physical and mechanical properties. The smelting of high-carbon ferromanganese with the use of ferromanganese cake with a basicity of less than 1.61 does not provide the necessary strength, vapor resistance and physical properties (electrical conductivity, viscosity, and initial melting point).

The selected amount of manganese raw materials in the composition of the proposed mixture is justified by the content of manganese in it

five

3

five

0 5 0

772

tsa (38-30 Mac.Z), as well as the necessary amount of it to produce high carbon ferromanganese.

The amount of reducing agent in the offered charge is determined by the electric mode and the completeness of the reduction processes in the reaction zone. When the content of the reducing agent in the charge is less than 10 wt.%, The extraction of manganese into the alloy is significantly reduced (no more than 68%) and its concentration in the slag increases (more than 16%), the slag multiplicity and loss of manganese increase. The content of the reducing agent in the charge of more than 14 wt.% Impairs the electric mode due to an increase in the electrical conductivity of the charge, a high fit of the electrodes, a decrease in temperature in the furnace and, consequently, the extraction of manganese into the alloy.

1 The values of the selected parameters of the content of ferromanganese sinter in the proposed blend composition are related to the content of silica and iron oxides in the manganese raw material, the need to maintain optimal basicity of slag (CaO + MgO): SiU 1.0-1.5, as well as to obtain standard high carbon ferromanganese.

In addition, the selected sinter composition promotes the formation in it of a sufficiently stable Fe 0 PsaO content, which prevents the destruction of the sinter in the conditions of ore-recovery smelting.

Under identical conditions, comparative melting of high-carbon ferromanganese is carried out in an ore-building electric furnace using the proposed and known charge.

The test results of the proposed charge for smelting ferromanganese are given in the table.

It has been established that the furnace productivity has risen by 20%, the specific energy consumption is reduced by 700 kWh / t of alloy, and the extraction of manganese is increased by 6.1%. The expected economic effect from the use of the proposed charge for the annual production of ferromanganese will be more than 1.0 million rubles. in year.

Iron Ore Pellets

Reducer (dry)

Fluxed ferromanganese

Editor A.Shishkin

Compiled by O. Veretennikov

Tehred M. Khodanich Proof-reader I. Erdeyi

Order 4591/29 Circulation 567 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

 -. . - - - - - -.-. - - - - - - - - - - - - - - - - - Production and printing company, Uzhgorod, Projecto st., 4

ten

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Claims (2)

1. The mixture for smelting high- COUGHLERIDE FERROMARGANese, co containing manganese raw materials, reducing agent, flux (limestone, dolomite) and ferrous additives, characterized in that, in order to increase manganese extraction, furnace productivity and reduce specific energy consumption, it contains fluxed ferromanganese as a flux and ferrous additives spec at the following components, wt.%: Reducing agent Fluxed ferromanganese spec Manganese raw materials 2. The mixture according to claim 1, with the fact that the fluxed ferromanganese cake has the following chemical composition, wt.%: Iron Alumina ratio 10-14 32-48 Else l and h a3-12 1-6 Silica Calcium Oxide Magnesium Oxide Manganese 11-18 27-34 2-5 Else