Beneficiation of High Phosphorus Limonite Ore by Sodium-carbonate-added Carbothermic Reduction

Abstract

The characteristics of Huimin high phosphorus limonite ore and the beneficiation of this iron ore by sodium-carbonate-added carbothermic reduction, ultrafine grinding and magnetic separation were investigated. Iron particle size in reduced ore without Na2CO3 additive is tiny and the fayalite is abundant. It is indicated that the formation of fayalite is the main hindrance to accelerate the reduction of limonite. With a mass ratio of Na2O3 to ore of 10% additive, the reduction of limonite can be reinforced. The reinforcing affect may be caused by the increase of the reducing reaction activity of FeO and the acceleration of the carbon gasification reaction rate. Fluorapatite were not reduced in the low temperature reduction process and entered to gangue phases, after ultrafine grinding-magnetic separation process, a qualified iron concentrate with 76.47% Fe, a recovery of 73.20% is obtained with simultaneous decrease in the phosphorus content down to 0.25%.

Production of (Mn,Fe)-Carbide Containing Low Phosphorus by Carbothermic Reduction of Mn Oxide and Fe Oxide

“…19,20) In addition, the behavior of phosphorus in the progress of reduction with carbon can be estimated by XRD pattern of Ca3(PO4)2 and CaO. Some portion of Ca3(PO4)2 was about to decompose according to Reaction (10), which was noticed with CaO peak identified at the time of 40 min: 21) ..... (10) 22) ......... (11) That is, the reaction temperature of Ca3(PO4)2 with carbon at the standard conditions can be calculated to be 1 418°C from the value of the standard Gibbs free energy of reactions by Eq. (11).…”

“…Effect of Phosphorus on the Formation Mechanism of Carbide High P manganese ore has complex composition containing several gangue compounds such as SiO2, Al2O3, MgO, Na2O, etc. 10) Because the gangue components of relatively small amount might interact with phosphorus in ores during the formation of manganese iron carbide, the reactions among the major compounds should be studied prior to that of high P manganese ore. Based on the experimental results using the reagent-grade chemicals, the interaction between manganese iron carbide and phosphorus in high P manganese ore was investigated. That is, the carbothermic reduction of MnO2, Fe2O3 and Ca3(PO4)2 was carried out at several temperatures in H2 atmosphere.…”

Distribution Characteristics of Phosphorus in the Metallic Iron during Solid-State Reductive Roasting of Oolitic Hematite Ore

“…However, the previous literatures merely focus on the intensified effect of SiO 2 rather than Al 2 O 3 . 12,14,25,26) Hence, the effects of SiO 2 and Al 2 O 3 on the reduction of hematite and fluorapatite are imperative to be taken into account together, due to the high content of quartz in the raw oolitic hematite ore as well as the formation of amorphous SiO 2 and γ -Al 2 O 3 resulted from the thermal decomposition of kaolinite. It can be confirmed by Fig.…”

“…On the other hand, additives such as Na 2 SO 4 , Na 2 CO 3 , CaO and Ca(OH) 2 can be used to suppress the reduction of fluorapatite by consuming SiO 2 and Al 2 O 3 in advance. [12][13][14]26) In regard with the treatment of high-phosphorus oolitic hematite ore via carbothermic reduction, measures should be taken in accordance with the target products: 1) for dephosphorization, the selective reduction of hematite and fluorapatite should be achieved; 2) for phosphorus enrichment via ferrophosphorus production, the maximum reduction of fluorapatite and the affinity of gaseous phosphorus and metallic iron should be guaranteed. Moreover, to realize the goals mentioned above, the destruction of the alternatingconcentric layers composed of hematite, fluorapatite, quartz and kaolinite in the oolitic hematite ore is essential.…”

Iron recovery and phosphorus removal from oolitic high-phosphorus haematite using the FASTMELT® process: a comparative study of two reductants

“…These processes can be categorized as biological (Delvasto et al, 2008;Obot and Anyakwo, 2013), hydrometallurgical (Cheng et al, 1999;Fisher-White, Lovel, and Sparrow, 2012;Ionkov et al, 2013;Jin et al, 2006;Yu, Guo, and Tang, 2013), and pyrometallurgical routes (Bai et al, 2012;Sun et al, 2013;Yu et al, 2013b;Zhu et al, 2013). The pyrometallurgical routes are useful for industrial practice with respect to processing costs, scale, and duration.…”