印度尼西亚海砂氧化性球团氢气还原机理

对印度尼西亚海砂矿氧化性球团氢气还原的规律做了较详细的研究。实验采用失重的方法,通过对反应过程的物相变化、热力学以及动力学方面的分析,探究了海砂球团矿氢气还原的机理。结果表明：温度在800℃和850℃,还原反应的最终产物主要是FeTiO3,整个反应限制环节是由两个不同阶段的过程组成,反应开始阶段由界面化学反应控制,之后由界面化学反应与内扩散共同控制；在900、950和1000℃三个温度下,反应产物中有钛氧化物出现,整个还原反应由三个不同的限制性环节组成,开始由界面化学反应控制,反应中间阶段是由界面化学反应和内扩散共同控制,反应后期则是由内扩散控制为主。

Hydrogen reduction mechanism of Indonesia ironsand oxidized pellets

This article is focused on the reduction law of Indonesia ironsand oxidized pellets by hydrogen. Reduction experiment was performed with a thermogravimetric analyzer. The hydrogen reduction mechanism of the oxidized pellets was studied by the phase change, thermodynamic and kinetic analyses of the reaction process. It is found that the final products are FeTiO3 at 800℃ and 850℃, and the restrictive step of reduction is composed of two different stages, which are chemical reaction in the early stage of reduction and the mixed-control of chemical reaction and intraparticle diffusion in the subsequent reaction. Titanium oxide appears at 900, 950 and 1000℃, and the restrictive step of reduction is composed of three stages, which are chemical reaction, the mixed-control of chem-ical reaction and intraparticle diffusion, and intraparticle diffusion.