合成异极矿元素硫水热硫化动力学(英文)

Kinetics of hydrothermal sulfidation of synthetic hemimorphite with elemental sulfur

研究了元素硫水热硫化合成异极矿的动力学研究,考察了搅拌转速(100～600r/min)、温度(120～220℃)、硫磺用量(摩尔比为0.6～1.6)和矿物粒度(48～246μm)对异极矿转化率的影响。结果表明:随着转化温度的升高和矿物粒度的减小,异极矿的转化率不断增大。当搅拌转速大于400r/min,硫磺理论摩尔比大于1时,其对异极矿的转化率影响不明显。异极矿元素硫水热硫化转化反应初期受化学反应控制,该过程的表观活化能为50.23kJ/mol,后期逐步转变为受固体产物层的扩散控制,其表观活化能为11.12kJ/mol。

The kinetics of hydrothermal sulfidation of synthetic hemimorphite with elemental sulfur was investigated. The effects of stirring speed (100?600 r/min), temperature (120?220 °C), sulfur dosage (mole ratio of 0.6?1.6), and particle size (48?246μm) on the hemimorphite conversion rate were studied. The results show that the conversion rate of hemimorphite increases with increasing temperature and decreasing particle size. A stirring speed above 400 r/min and a sulfur dosage above 1 have very little effect on the conversion rate. The kinetics analyses of the experimental data under various conditions indicate that the sulfidation process is controlled by the chemical reaction at the early stage of process with activation energy of 50.23 kJ/mol, and then controlled by diffusion through the product layer with activation energy of 11.12 kJ/mol.