Utilização do coque verde de petróleo sob a forma de small no alto-forno

Abstract

One of the ways to try to minimize the impact of the hot metal producing cost is the proper use of small coke, considering, of course, the balance between generation and consumption of each industry. When distributed into the metallic charge, this material acts as a source of gas regeneration, improving the reduction of iron oxide. However, its mechanism is not well defined, a fact that still limits its use industrially. At Usiminas, the balance between generation and consumption of this material limits its use at rates below the national average, actually in 45 kg/t. Therefore, it was evaluated the effect of pet coke to replace small coke in fuel consumption and blast furnace operational stability. The industrial test results indicated the possibility of replacement up to 45 kg/t hot metal, with fuel rate maintenance, burden permeability and blast furnace productivity.