Kinetic Study of the Oxidation and Fusion of Copper Concentrate Particles in a Gas Stream.

在较低的温度下（在此温度下，铜精矿颗粒不会着火），测定铜精矿颗粒的氧化速率，为分析铜闪速熔炼炉中的反应提供基础知识。当转化率小于0.2时，氧化反应受化学反应控制，而当转化率大于0.2时，氧化反应受气体通过氧化层的扩散控制。建立了氧化反应动力学数学模型，模型中考虑了颗粒、气流和垂直反应管之间的传热传质过程。通过实验观察和数学模型计算发现，只要精矿颗粒达到点火温度，并有足够的氧气，精矿颗粒就会被快速氧化产生的反应热熔化。浓缩物颗粒的融合在约0.4秒的非常短的时间内发生。

It was intended in this work to measure the oxidation rate of copper concentrate particles at rather lower temperature at which the ignition of particles did not occur, in order to get fundamental knowledge for the analysis of reactions in copper flash smelting furnace. When the conversion was less than 0.2, theoxidation was controlled by chemical step, while it was controlled by gas diffusion through the formed oxide layer when the conversion was higher than 0.2.Kinetic parameters were determined based on the experimental observations.On the other hand, the oxidation and fusion of copper concentrate particles falling in a vertical tube were also studied. A mathematical model was developed in which the oxidation kinetics, and heat and mass transfer between particles, gas stream and vertical reaction tube were included. It was found from the experimental observations and computation based on the mathematical model that the concentrate particles were melted by the heat of reaction due to a very rapid oxidation provided that the particles attained at an ignition temperature and enough amount of oxygen was available. The fusion of concentrate particles took place in a very short time of about 0.4 seconds.