The enormous demand for and consumption of nickel in industrial applications has induced the depletion of high-grade nickel sulfide ore, which has inevitably led to the utilization of the substantial deposits of depreciated low-grade nickel-copper sulfide ore. In this work, the mineral phase transformation and sulfation kinetics of nickel, copper, iron, and magnesium in the roasting process were studied. The kinetic parameters of the metals were calculated by using the sulfation rates under different roasting temperatures, ratios of acid to ore and particle size of ore. The results showed that the sulfation process of metals is fit well by the kinetic function \(1 - {{\text{2}} \mathord{\left/ {\vphantom {{\text{2}} 3}} \right. \kern-0em} 3}x - {{(1 - x)}^{{{{\text{2}} \mathord{\left/ {\vphantom {{\text{2}} 3}} \right. \kern-0em} 3}}}} = kt\) (G–B equation) over 0–20 min and 30–150 min for nickel, copper, and iron, as well as over 5–30 min in the case of magnesium. Furthermore, internal diffusion (three-dimensional diffusion, D₄) was the restricting factor in the sulfation processes of the metals, as suggested by experimental data regarding the ratio of acid to ore and the particle size of ore.

中文翻译：

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硫酸焙烧过程中低品位镍铜硫化矿的硫化动力学

工业应用中对镍的巨大需求和消耗已导致高品位硫化镍矿的枯竭，这不可避免地导致了对折旧低品位镍铜硫化矿矿石的大量沉积物的利用。在这项工作中，研究了焙烧过程中镍，铜，铁和镁的矿物相变和硫化动力学。金属的动力学参数是通过使用不同焙烧温度下的硫酸化速率，酸与矿石的比例以及矿石的粒径来计算的。结果表明，金属的硫酸盐化过程具有良好的动力学函数。\（1-{{\ text {2}} \ mathord {\ left / {\ vphantom {{\ text {2}} 3}} \ right。\ kern-0em} 3} x-{{（1-x }} {{{{{\ text {2}} \ mathord {\ left / {\ vphantom {{\ text {2}} 3}} \ right。\ kern-0em} 3}}}} = kt \）（G–B方程）对于镍，铜和铁在0–20分钟和30–150分钟之间，对于镁，则在5–30分钟以上。此外，内部扩散（三维扩散，D ₄）是金属硫酸化过程的限制因素，这是关于酸与矿石的比例和矿石的粒径的实验数据表明的。