Metallurgical effect of microwave-hydrogen synergistic reduction for vanadium-titanium magnetite concentrate

In order to realize the efficient and reasonable utilization of vanadium-titanium magnetite resources, microwave-hydrogen synergistic reduction of vanadium-titanium magnetite concentrate powder/briquette and biomass composite briquette were adopted, and the metallurgical effect of reduction was analyzed. The results show that the reduction product has high metallization rate, with an average value of over 94%. The reduction product metallic iron of concentrate powder/briquetting is porous and spongy. The titanium and iron oxides in the incompletely reduced titanium-iron paragenetic ore are staggered with holes, but the pore structure of reduced metallic iron after briquetting is more developed and dense. There are developed cracks in the reduction products of biomass composite briquetting, metallic iron is in large-diameter granules, and some refractory oxides are wrapped by metallic iron. The addition of biomass plays a reducing role and creates gaps for gas diffusion. Based on this, the "two-step" separation process strategy of "concentrate pellets/biomass composite pellets-microwave hydrogen reduction-ball milling and magnetic separation-tailings high-temperature reduction" is put forward. Although this strategy is only general concept at present, the microwave-hydrogen synergistic reduction method not only ensures the high metallization rate of the product, but also promotes the formation of holes and cracks in the product, which provides favorable mineralogical conditions for the separation of titanium and iron.