SU605839A1 - Method of smelting vanadium-containing steels and alloying-reducing mixture for effecting same - Google Patents

Description

lost m; to a significant increase in the viscosity of the furnace slag, which drastically reduces the absorption of vanadium and metal from the vanadium shpak and makes it difficult to produce and cast metal.

With the chain of increasing the physicomechanical CBOifejTB metal, the degree of vanadium slag extraction from vanadium slag, and the reduction of manganese oxide, it was proposed to introduce vanadium cong slag into the reducing agent after the reduction of silicon together with the reducing agents and alloying elements.

For the implementation of the method, a hand-de-reducing mixture is used, consisting of Shuya from vanadium converter slag, aerobenzoic ferromanganese or silicomanganese, aluminum powder or grits and lime or lime, with the components B taken as follows (l-kg per 1 t metalfill):

Vanaaiesh 1b converter slag 10-20 Crushed ferromanganese or sipicomargane5-15

Aluminum powder or

Krupka, 1-1.0

Lime to or lime1-3

The method consists in the following: The metal charge is loaded into an electric arc furnace and is melted in the usual manner before the oxidation period. Then pagreya

After the silicon has been reduced during the recovery period of smelting, a doping mixture of the following composition is added (l kg per ton of metal dumping): vanadium slag 10-20, crushed ferromanganese or silicomanganese 5-15, aluminum powder or grit 0.1-1. , 0 and limestone or lime 1-3. This reduces the viscosity of the furnace slag, which leads to an increase in the recovery of vanadium from vanadium slag, an improvement in the deoxidation of steel, as well as a decrease in the oxidation of manganese. The slag is not downloaded and then the smelting is carried out and the metal is released under an acidic slag.

When conducting melts used vanadium slag NTMK of the following composition,%

45

, 65

Sel about

3.85

Geo 38.20

6.50

MPO 7.45 Other Inclusions 1.90

The degree of assimilation of vanadium from vanadium slag in this method of steelmaking is 97-98%.

The chemical composition of melted melts is presented in the table.

The table shows that in the steelmaking method, the vanadium slag introduced is not

influence on chemical composition change

steel, and also confirms the assimilation of vanadium metal and; from the vanadium sandstone in the range of 97-98%.

The proposed method for smelting vanadium-containing steels was tested in laboratory and factory conditions. Steel was smelted in six-ton electric arc furnaces with acid lining under one slag. The composition of the charge was taken according to the existing technology at the plant.

Claims (3)

1. The method of smelting vanadium-containing steels, which involves melting the charge, carrying out oxidation and reduction periods, deoxidation with aluminum and silicocalcium, using vanadium converter slag for vanadium doping, in order to improve the physical and mechanical properties of the metal, the degree of vanadium extraction from vanadium slag and reducing the oxidation of manganese, vanadium converter slag is introduced into the reducing period after the reduction of silicon along with reducing L E and alloying elements. 2. Alloying-bcc: a fusible mixture, for carrying out the method according to claim 1, consisting of vanaya converter slag, shot-1 molten ferromanganese or silicomanganese, aluminum powder or grains, and lime or lime, wherein the components are in the following ratio (l kg per 1 ton of metal dumping): Vanadium Converter Slag 10-20 Crushed ferromanganese or silica gel5-1.5 Aluminum powder or grit 0.1-1.0 Lime to or lime1-3 Sources of information taken into account in the examination: 1. Authors certificate USSR 196064, C 21 C 5/52, 1964. 2. Author's certificate of the USSR 285822, C 21 C 5/52, 1970. 3. Authors certificate of the USSR Ms 394437, C 21 C 5/52, 1973.