A novel approach of utilizing the waste biomass in the magnetizing roasting for recovery of iron from goethitic iron ore

Improving the grindability of rice husk-based green silica through pyrolysis process optimization employing the Taguchi method and response surface methodology

“…Crucially, when SiO 2 particles are smaller and boast a larger SSA, their dispersion and affinity with the reinforcing matrix are enhanced, culminating in a significant reinforcement effect on the composite material. 45 The factors that influence the grindability of RHA-SiO 2 include the drying method, 46,47 pyrolysis temperature, 17,48 torrefaction treatment, 49 and pretreatment method. 50 Existing studies mainly concentrated on one or two of the influential factors, neglecting to consider all the above factors, let alone the main factors impacting the grindability of RHA-SiO 2 .…”

“…The factors that influence the grindability of RHA-SiO 2 include the drying method, 46,47 pyrolysis temperature, 17,48 torrefaction treatment, 49 and pretreatment method. 50 Existing studies mainly concentrated on one or two of the influential factors, neglecting to consider all the above factors, let alone the main factors impacting the grindability of RHA-SiO 2 .…”

Waste Corn Straw as a Green Reductant for Hematite Reduction Roasting: Phase Transformation, Microstructure Evolution and Process Mechanism

“…The characteristic diffraction peaks of hematite were significantly weakened at 500 • C, indicating that the reduction of hematite occurred mainly before 500 • C. At 700 • C, magnetite became the dominant phase, indicating that most of the hematite had been reduced to magnetite. At 800 • C, over-reduction occurred, resulting in the formation of wustite [19]. The characteristic diffraction peaks of carbon were also observed, indicating that carbon with great crystallization was deposited on the particle surface [16].…”

“…Qiu et al [16] further verified the feasibility of using fir sawdust as a reductant in iron tailings, and pointed out that the biomass oil generated during magnetization roasting would affect the operation of industrial equipment. In addition, sawdust [17,18], banana tree bark [19], leaf litters [19,20], etc., have been verified as green reductants that can be used for the reduction roasting of iron minerals, and can obtain good beneficiation indicators. Furthermore, these studies show that the reducing gases produced by pyrolysis during biomass roasting are mainly CO and H 2 , which are the main reductants for the reduction of iron minerals [13,15,16].…”

Beneficiation of Low-Grade Hematite Iron Ore Fines by Magnetizing Roasting and Magnetic Separation

“…The implementation of a multigravity separator significantly improved the quality of low-quality iron ore powders, elevating the ore of iron grade from 50.74 to 65.11% with an impressive iron retrieval rate of 71.88%. Several techniques have been utilized to improve the quality of inferior iron ores, encompassing magnetic separation, gravity separation using hydrocyclones, spiral concentrators, and jigs, as well as flotation processes. − Despite achieving iron ore concentrate grades comparable to those employed in blast furnace operations, the challenges of insufficient iron recovery and significant iron wastage persisted. This issue may stem from the intricate interactions among gangue minerals and the prevalence of abundant gangue materials and fine iron particles within low-quality iron ores.…”