Kinetic Study on Copper Flash Smelting Process

为测定本然反应速率常数，将10 mg铜精矿颗粒喷入氧化铝棉中，在O_2-N_2气流中加热至1000K。在活化能为13 kcal/mol的条件下，由SO_2气体的析出量测定了颗粒在加热过程中的氧化速率，估计出速率常数的频率因子k_0为1.2x10^4。而k_0值随着升温速率和氧分压的降低而降低。另一方面，将4种不同成分的铜精矿送入高度为1.8 m的垂直反应管顶部。对反应管中下降过程中的颗粒进行了取样和S含量分析。从颗粒的脱硫率出发，计算了颗粒在下降过程中的温度变化。在离反应管顶部30 ~ 60 cm处，颗粒温度最高约为1800K，与观测结果一致。CuFeS_2组成的铜精矿k_0值约为lx10^5。当Cu_9Fe_9S_<16>和Cu_5FeS_4组成精矿时，其值约为lx10^4。

In order to measure the intrinsic reaction rate constant, an amount of 10 mg of copper concentrate Particles was sprayed in alumina wool and it was heated up to 1000K in an O_2-N_2 gas flow. The oxidation rate of the particles during the heating was measured from the amount of SO_2 gas evolved and the frequency factor k_0 of rate constant was estimated as 1.2x10^4 at an activation energy of 13 kcal/mol. However, the k_0-value decreased at lower heating rate and lower oxygen partial pressure.On the other hand, four kinds fo copper concentrate of different composition were fed to the top of a vertical reaction tube of 1.8 m height. The particles during the descent in the reaction tube were sampled and analyzed for S content. From the fraction desulfurized of the particles, the variation of particle temperature during the descent was calculated. The maximum particle temperature of about 1800K was attained at a position of 30 to 60 cm from the top of reaction tube, which was in agreement with the observation. The k_0-value of copper concentrate composed of CuFeS_2 was about lx10^5. Its value decreased with the amount of FeS_2 contained in the concentrate and that for the concentrate composed of Cu_9Fe_9S_<16> and Cu_5FeS_4 was about lx10^4.