A device and method for increasing the amount of graphite precipitation in molten iron

Abstract

This invention relates to the field of comprehensive resource utilization, specifically to an apparatus and method for increasing the amount of graphite precipitation in molten iron. The apparatus includes a blast furnace molten iron trough, with multiple injection pipes at the bottom. The other end of each injection pipe is connected to a pulverized coal feeding system via a conveying pipe. The method involves injecting pulverized coal into the molten iron trough through the injection pipes to increase the carbon content of the molten iron. As the molten iron cools, it becomes supersaturated with carbon, leading to graphite precipitation. This invention injects pulverized coal into the molten iron trough, utilizing the higher temperature of the molten iron and the stirring kinetic energy generated by the iron flow to promote rapid and efficient dissolution of the pulverized coal, increasing the carbon content. Furthermore, by employing a suitable blast furnace molten iron cooling rate, it significantly improves the subsequent graphite precipitation ratio under the same conditions. The carbon injected into the molten iron in the form of pulverized coal ultimately precipitates as graphite, greatly enhancing the added value of iron and steel metallurgy and resulting in significant economic benefits. It also has a significant impact on the development of emerging graphite resources.