Method for melting molten iron

Abstract

The invention relates to a method for melting molten iron. The method comprises the following steps: adding cast iron into a furnace bottom and placing densely, then adding one part of waste steel, and electrifying and melting; continuously adding the remaining waste steel in the electrifying and melting process; after the cast iron and the waste steel are melted completely, increasing the temperature of molten iron in an electric furnace to be above 1,520 DEG C, adding silicon iron, ferromanganese, ferrochrome and copper alloy, and powering off and standing after 2 to 5 minutes; and adding recirculated iron in an amount which is 3 to 10% of the total weight of all the furnace materials into the power-off and standing molten iron, tapping and pouring after the furnace temperature reaches the tapping temperature. According to the method, the recirculated iron is added into the power-off high-temperature molten iron and is melted by utilizing the heat of the high-temperature molten iron, and the recirculated iron achieves an effect of reducing the temperature of the molten iron as quickly as possible to reach the requirement of tapping temperature, so that electricity is saved by 10 to 15% in the melting process of the molten iron and melting efficiency is increased by 8 to 10%. The molten iron of the electric furnace needs to be electrified and melted for 3 to 5 minutes before tapping, so that the components of the molten iron of the whole furnace are uniform through electromagnetic stirring.

Description

technical field [0001] The invention relates to a melting method of molten iron. Background technique [0002] The conventional method of melting molten iron in an electric furnace is: put pig iron, scrap steel, returned iron, ferrosilicon, ferromanganese, ferrochrome, copper alloy and other required alloy materials into the electric furnace according to a certain ratio and in a certain order for electric melting. At the same time, in order to eliminate the genetic characteristics of raw materials (especially pig iron), it is necessary to raise the temperature of the molten iron to above 1520°C, then turn off the power and let it stand for a certain period of time. Since the returned iron in this conventional electric furnace melting method has undergone at least one high-temperature melting, its bad genetic characteristics have been reorganized, that is, the returned furnace iron no longer needs to be subjected to a high-temperature melting process, therefore, this convent...

AI Technical Summary

Problems solved by technology

Since the returned iron in this conventional electric furnace melting method has undergone at least one high-temperature melting, its bad genetic characteristics have been reorganized, that is, the returned furnace iron no longer needs to be subjected to a high-temperature melting process, therefore, this conventional electric furnace melting molten iron The method will increase the power consumption of the electric furnace for melting molten iron, which is not energy-saving and environmentally friendly.