镍钼共生矿加压酸浸动力学研究

采用氧压酸浸工艺处理镍钼共生矿。结果表明,钼、镍、铁的浸出率均随着温度的升高、时间的延长基本呈线性上升的趋势,钼、镍的浸出率最高分别达到67.50%、99.62%,而铁的浸出率被抑制在50%以下。经氧压酸浸处理得到的钼渣基本以H_2MO_4形态存在,常规碱浸工艺能将其高效浸出且碱耗量大大降低。动力学研究表明,镍钼共生矿氧压酸浸过程中钼、镍、铁浸出反应的表观活化能分别为11.37、34.95、18.44kJ/mol,钼、镍、铁的浸出反应速率受内扩散控制。

Study on Kinetics of Oxygen Pressure Acid Leaching of Ni-Mo Ore

Ni-Mo ore was treated by oxygen pressure acid leaching. The results show that leaching rate of Mo, Ni and Fe rise with increase of temperature and time. The maximum leaching rate of Mo and Ni is 67.50% and 99.62% respectively, while leaching rate of Fe is 50% below. Most of molybdenum in residue exists in form of H2MoO4, which can be effectively leached by conventional alkali leaching process with lower alkali consumption. The apparent activation energy of Mo, Ni, and Fe is 11.37, 34.95, and 18.44 kJ/mol respectively. Leaching reaction of Mo, Ni, and Fe is controlled by internal diffusion.