Recovery of iron from iron tailings by suspension magnetization roasting with biomass-derived pyrolytic gas

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

“…During the MPT process, the of corn straw was a critical factor in determining the concentration of reducing gas [16]. Compared with the time and temperature factors, the same phase transformation trend was observed (Figure 4c,f).…”

“…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]. These observations suggest that during the MPT process of corn straw and hematite, hematite was first reduced to magnetite, followed by the formation of wustite at higher temperatures.…”

“…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].…”

“…Deng et al [15] explored the effects of different types of biomass on magnetization roasting of iron tailings, and found that woody biomass is better than straw biomass, and when fir sawdust was the reductant, iron concentrate with an iron grade of 62.04% and an iron recovery of 95.29% could be obtained. 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.…”

Transforming Mining Waste to Wealth: A Novel Process for the Sustainable Recovery and Utilization of Iron Tailings through HCl Leaching and MOFs Absorption

“…Combined with Figure 7 and Table 3, it can be seen that the influences on the extraction efficiency of V are time, liquid-solid ratio, temperature, and pH. p value of time (C) was less than 0.0001, and the p value of time and liquid-solid ratio interaction term (CD) was 0.0128 [53]. The interaction of surface time and liquid-solid ratio has a great influence on the extraction efficiency of V [54].…”