Experimental Study on Hydrogen Direct Reduction of Hematite in a Lab Scale Fluidized Bed Reactor by Estimating the Gas Consumption Rate

Abstract

: Hematite reduction using hydrogen was conducted and the various process parameters were closely observed. A lab scale fluidized bed unit was designed especially for this study. The optimal values of the gas velocity, reduction time and temperature were evaluated. The values which indicated the highest reduction rate were set as fixed parameters for the following tests starting with the reduction time of 30 minutes and 750 ℃ of temperature. Among these variables the one with the highest interest was the gas specific consumption. It will tell the amount of the gas which is required to achieve a reduction rate of over 90% at the optimal conditions. This parameter is important for the scale up of the lab scale unit. 1,500 Nm 3 /ton-ore was found to be the optimal specific gas consumption rate at which the reduction rates exhibit the highest values for hematite.

Utilization of High-Zn Content Ferrous Landfill Sludge with the Use of Hydrogen

“…In works [38][39][40][41], the authors researched the direct reduction of iron ore using hydrogen. Synthetic hematite samples were reduced using a mixture of pure hydrogen with 10% helium in the 550-900 • C temperature range [38].…”

“…Hematite ore samples and hydrogen have also been examined as a reducing agent [39]. The temperature range was between 500 and 900 • C. The sample amount varied between 80, 100, and 140 g, with an average particle size of 69 µm.…”