SU1458411A1 - Method of melting high-carbon ferromanganese - Google Patents

Abstract

The invention relates to ferrous metallurgy, specifically to the production of manganese ferrosplaze. The aim of the invention is to reduce the phosphorus content in the alloy and to increase the manganese recovery. Proposed in. Furnace to load 3-95% of iron-containing raw material and part of the flux, ensure that the ratio of CaO and BiO in the mixture is OG-1JO, and calcine the rest of the mixture of flux and iron-containing raw material and set uniformly in .KOBL4 during 5t of metal production from the “For due to the silicon content in the alloy in the furnace, 11 refining it to the standard content during production, the phosphorus content in the alloy decreases in comparison with the 1-weighted method by 0, -0ji3 abss%, and the extraction of manganese increases by 1., 5-3.3 2 table „f

Description

The invention relates to ferrous metallurgy, namely the production of ferroalloys with manganese.

The purpose of the invention is to reduce the phosphorus content in the alloy and increase the manganese recovery.

Since the increased silicon content in the alloy during its accumulation in the furnace is favorable for reducing the phosphorus content in the metal and increasing the extraction of manganese from the oxide melt, it is recommended to remove 3-95% of the iron-containing raw material and a part of the flux from the composition of the melted mixture then set uniformly in the bucket during release

metal from a furnace for refining the resulting alloy from excessive silicon content. At the same time, the amount of the flux melted should ensure the maintenance of CaO / Si07. in Gaihte O56-1.05 a, the flux5 loaded into KOBiij should ensure this ratio B of the final slag 1.1 1525,

The refining of silicon from silicon is due to the oxidation of iron oxides with oxygen by it.

When used to melt less than 3% of iron-containing raw materials, it is not possible to obtain a standard silicon alloy for refining

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When using more than 9f)%, the setpoint is not reached.

- With a CaO / SiO ratio in the blend of less than 0.6, the silicon content in metagsh increases unacceptably, and with a ratio of more than 1.0, the quality of the phosphorus alloy.

To prevent discharges from interfacial and solid interactions

demolish the agrom aemey into the ladle; it is preliminarily calcined in a conventional manner.

The total consumable cooTHoraei of the charge components was determined by calculation based on the initial basicity of the manganese-containing raw material, its quality and the requirements of GOST 4755--80 on the content of silicon and phosphorus in ferromanganese. The total amount of the flux of the lean additive was calculated on the basicity of the final slag 1,} - 1.25.

Examples of testing the previous method.

In identical labs () p5lgc conditions, comparative melts of high-carbon ferromanganese were carried out according to the methods and methods proposed.

The ferromanganese smelting was carried out in a laboratory ore-producing anovi-3-phase 3-phase furnace with a capacity of 160 kVA. The furnace is powered from a 3-phase transformer of the TPS-1000-ZU 1 type with a supply voltage of 380 li at a frequency of 50 Hz, consumed by the ocean 245 A ,, current of the secondary circuit A. Depending on Eflavlzhgmy alloy, charge materials and D1), process parameters, the voltage in the secondary circuit at different voltage levels varies from 47.5 to 5) B.

Marble agglomerate of grade ASHV-1 (STP 1 46-28-82), limestone (OST. 1 464-80), coking (GOST 8188-74), kefluous iron ore pellets ( TU 1 4--9--1 32-78 J ,, the quality of the specified materials met the technical conditions for high-carbon fer1) lobster manganese melting according to ТЙ-146-Ф-33-82.

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The chemical composition of the starting materials is given in Table “1.

There are no other tests to follow.

The calculated weight of charge materials was divided into two parts according to the proposed method of smelting. The mixture to be introduced into the ladle, was placed in a muffle furnace, and the rest of the mixture was smelted in a furnace, keeping the furnace top level. After removal of 280 - 320 kWh of electricity, the melt was released from the furnace into a cascade-mounted ladle - the ashakov mold.

As the melt was released from the furnace, the calcined part of the charge was gradually introduced into the ladder through the refractory funnel. In the course of production and after a short period of time, metal and slag extracts were sampled for analysis.

In tab. 2 shows comparative indicators of the tests performed.

The use of the proposed method in comparison with the known allowed phosphorus content in the alloy on O ,, 1 - 0.13 abs.%, To increase the extraction of manganese by 1.5 - 3.3 abs,%.

Claims (1)

Invention Formula The method of smelting high-carbon ferromanganese, including loading manganese and iron-containing raw materials, flux and reducing agent into an electric furnace, melting them and periodically melt from the furnace into the ladle, maintaining the CaO / SiO / j ratio in the final slag 1.1-1.25, differing from that, in order to reduce: i in the alloy the phosphorus content and increase the extraction of manganese, 3-95% of iron-containing raw material and a part of the flux are loaded into the furnace, ensuring the ratio of CaO / SiOj in the charge of 056-1.0, and the rest of the mixture of mineral and iron-containing raw material pre preliminarily calcined uniformly and ask the ladle during vshuska metal from the furnace. T. A b l and c a Manganese , about eat oats oven ladle 100 98 1,151,1 too . 33 100 Coke 20 Electrical Parameter Actual power n & (and, kW 110 Voltage level {secondary voltage B) 3 (47.5) 3 (49.8) 6 (56.4) Sod w 0.850.87 98 95 49 1.0 1.0 0,80,6n, 4 100 100 100 too 20 20 20 20 117. 121 130129 120 (56,4) 0.9 4 (56.1) 5 (59.0) 4 (52.8) I, 910,90,89