Reduction mechanisms of vanadium–titanomagnetite–non‐coking coal mixed pellet

Abstract

Experiments were carried out by testing the specimens of separate layers of iron and coal and single pellets thermogravimetrically in a nitrogen atmosphere to study the non‐isothermal reduction mechanisms of vanadium–titanomagnetite–non‐coking coal mixed pellets. The degree of reduction was measured by the weight loss. The E values of the pellet reduction were calculated based on the mass action law. It was found that with increasing temperature the reduction processes may be divided into four stages: reduction via CO and H₂ from volatiles at 400–650°C, reduction via H₂ and C generated by cracking of hydrocarbon at 650–850°C, direct reduction of carbon via gaseous intermediates at 850–1050°C and direct reduction of carbon above 1050°C.

Keywords:

• Vanadium–titanomagnetite–non‐coking mixed pellet
• Non‐isothermal reduction
• Reduction degree
• Reduction mechanism