Dephosphorization Treatment of High Phosphorus Iron Ore by Pre-reduction, Air Jet Milling and Screening Methods

Abstract

This paper proposes a novel process for the pre-treatment of high phosphorus iron ore by pre-reduction, air jet milling and screening methods. The dephosphorization behavior was evaluated as a function of such parameters as the milling gas kinetic energy, Ek and specific energy consumption, Esp. At a fixed milling gas kinetic energy, the dephosphorization treatment behavior was highly dependent on the solids feed rate and the degree of sintering of the pre-reduced phases. The proposed pre-treatment process involves a pre-reduction process by carbonaceous materials at 1200°C, and air jet milling using Ek of 325.24 kJ and Esp of 3.24 kJkg -1 h followed by fine screen separation using a 25 μm screen size.KEY WORDS: high phosphorus iron ore; solid state carbothermic reduction; sintering degree; dephosphorization treatment; air jet milling; specific energy consumption; milling gas kinetic energy; solids feed rate.

Dephosphorization of Iron Ore Bearing High Phosphorous by Carbothermic Reduction Assisted with Microwave and Magnetic Separation

“…The reduction process was proved to be beneficial for iron recovery though, the authors found that it is very difficult to separate the ferrous phase with the P-containing gangue, this phenomenon was also found in other researchers' work. 13,14) Besides, most of the P exists in the form of inter-grew structure with hematite hampering the mechanical separation. It seems that the smelting process is necessary in order to separate the P from the Fe.…”

“…MATINDE et al also found the contradictory relation and pointed out the difficulty of P-Fe separation due to the phenomenon that powdery gangue surrounded reduced iron. 14) From this point of view, a integrated process combines pre-reduction (solid state) and mechanical separation methods could not separate the Fe and Pcontaining phases efficiently.…”

“…Wu et al 12) put forward a integrated dressing process-Magnetizing roasting, magnetic separation and reverse flotation dressing considering the influences of temperature, basicity and coal ratio. Matinde and Hino 13,14) investigated the possibility of dephosphorization by using pre-reduction and screening methods combined with mechanical crushing or air jet milling.…”

Concentrating of Iron, Slag and Apatite Phases from High Phosphorous Iron Ore Gaseous Reduction Product at 1473 K by Super Gravity

“…Conversely, lower the reduction temperature is beneficial for the dephosphorization during the coal-based reduction process, while it will hinder the reduction rate of the reduced product. Therefore, E. Matinde, 16,17) S. J. Bai 18) and W. Yu 19) have widely investigated the function of dephosphorization by adding Ca(OH) 2 and Na 2 CO 3 on the coal-based reduction, the experiment results show that the additives is beneficial for the dephosphorization during the ore-carbon reduction in a semi-molten state.…”

Dephosphorization Treatment of High Phosphorus Oolitic Iron Ore by Hydrometallurgical Process and Leaching Kinetics

“…Therefore, the abundant high phosphorus oolitic iron ore reserves have remained largely unexploited. The dephosphorization of high phosphorus iron ore has been researched in many countries, such as physical separation, [6][7][8][9][10] bio-leaching, 11,12) flotation, 13,14) hydrometallurgical process. 15,16) But the oolitic structure of the ore prevents the effective use of physical concentration and flotation separation, and necessitates the use of chemical leaching.…”