Recovery of Mo from Ni-Mo ore leach solution with carrier co-precipitation method

In this paper, “nascent” Fe(OH)₃ as carrier precipitation and NaHCO₃ as buffer agent were used to extract molybdenum from the complex Ni-Mo ore leach solution. The effects of different variables on the molybdenum extraction, such as the dosage of FeCl₃ and NaHCO₃ and the reaction temperature and time, were studied. The results showed that over 99% of molybdenum were extracted in 2 h at 25 ± 1 °C under the conditions of mole ratio of Fe³⁺/Mo 2.2-2.5 and mass ratio of NaHCO₃/Mo 0.7-1.5. About 92% of Mo in the Fe(OH)₃ precipitation can be leached by NH₃⋅H₂O to prepare the ammonium molybdate solution with about 100 g/L Mo. After treating with NH₃⋅H₂O, the Fe(OH)₃ precipitation was dissolved with HCl to obtain the FeCl₃ solution (FeCl₃ 500 g/L) which can be reused for the next round of experiments.     

微波等离子体炬摄谱特性的初步研究

微波等离子体是新研制的一种原子发射光谱分析激发源,其特点是结构简单、造价低、激发效率高,是一种有实际开发价值的分析光源。我们用摄谱法对其性能作了初步研究,主要是酸性、气流量、输入功率的影响,其目的在于探索把它应用于摄谱分析的可能性。