SU269947A1 - METHOD OF METAL FLOAT IN A GAS VAGRANKA - Google Patents

Description

A known method of smelting a metal in a gas cupola is to create a reducing atmosphere, for example, in a blast furnace, by reducing iron oxides with carbon monoxide gas.

The proposed method differs from that in that, in order to reduce oxides, carburize the metal and create the reducing atmosphere of the furnace, hydrocarbons are introduced into the high-temperature areas of the furnace.

The essence of the proposed method is as follows.

In a gas cupola with two steps in the mine, hot gases, the passage between the steps, melt the metal that enters the pool at the bottom of the overheating chamber in the form of “rain. A large number of flares are directed at the boiling point, the metal surface, which creates a solid layer of hot gases above it with an air excess factor of a 0, 98 (the optimal value of a, which does not contain free oxygen in the combustion products, depends on the temperature in the overheating chamber ). Higher than the burner tunnels, the composition of the gas phase in the superheat chamber varies by the supply of natural gas. Here, the coefficient of excess air is 6-nO, 7. In the melting zone, 0.4-7-0.5. In this case, black carbon and free hydrogen are present in the gas phase, capable of reducing the metal from oxides (in this case, the saturation of the metal with carbon is also possible). The reducing gases unreacted with the metal oxides and the reducing carbon burn out in the upper part of the mine, where a is reduced to about 1.1 as a result of the supply of secondary air to the shaft. The heat released during this process is used to heat the shchi and it can also be used to heat the air and natural gas consumed for smelting.

Subject invention

A method of smelting metal in a gas cupola, characterized in that, in order to reduce oxides, carbonize the metal and create a reducing atmosphere of the furnace, hydrocarbons are introduced into the high-temperature areas of the furnace.