Kinetic model for direct smelting reduction process of Huimin iron ore

Abstract

A series of experiments have been carried out to investigate the direct melting reduction process of high phosphorus iron in a nitrogen atmosphere with non-isothermal heating. The weight loss factor of the iron ore can be considered as a function of the temperature in the reduction progress. The kinetic parameters of the model can be determined by the data in a single test with a non-isothermal heating rate. With the temperature increasing, the reduction process can be divided into decrystal water phase of limonite, the pre-reduced phase of hematite, and finally reduced phase. The final reduction can be divided into three sections. On this basis, functions of the reaction mechanism and apparent activation energy in each stage are expected to be investigated. Then, the compensation effect of the whole reaction process is presented. Finally, the relationship of apparent activation energy and pre-exponential factor are also analysed.

Experimental Study on Efficient Recovery of High-Grade Sulfide Ore

“…According to the occurrence status of gold, the method of reselection + flotation test is selected [8][9][10] . KC-MD3 Nielsen concentrator is selected.…”

Kinetics for Reduction of Iron Ore Based on the Phase Space Reconstruction

“…Considering that higher degree agreement of the most probable mechanism functions with the experimental data [19], which was from thermal analysis in the various stages of reaction, its function models were employed to establish the structural equation of the attractor, so that to explore the equations of mathematical physics of the graphic structure. The measured and calculated results of various stages were shown in Figure 11.…”

“…Taken prereduction stage as an example, the reaction mechanism function ( ) = [− ln(1 − )] 4 was obtained. The relationship of the reaction fraction changed with temperature was shown in (5) [19]. Consider…”

“…After substituting (5) with = 1 /( 2 − ) [19] and = / , where ( ) is the integral mechanism function; Journal of Applied Mathematics implies the preexponential factor; is the apparent activation energy, represents the gas constant 8.314; is the heating temperature; and is the heating rate. So (6) is got by finishing.…”