混合沉淀法制备氧化钕工艺研究

用草酸作为沉淀剂以氯化钕为原料生产氧化钕是较为传统的方法.近年来,有些企业为降低氧化钕的生产成本改用碳酸氢铵作为沉淀剂,用这种方法生产的氧化钕其部分物理性能达不到用户的要求.通过对草酸沉淀法制备氧化钕工艺进行研究,发现采用草酸与氨水混合沉淀剂制备氧化钕,得到的氧化钕产品的性能与单一用草酸作为沉淀剂得到的产品的性能完全相同.同时采用该方法与草酸沉淀法相比,制备每千克氧化钕其草酸单耗下降0.32 kg,氧化钕收率提高0.8%,生产每吨氧化钕产品其成本可降低3 240元,具有显著的经济效益.

Production technology of neodymia by mixed precipitation method

Using oxalic acid as precipitator and neodymium chloride as raw material to make neodymia (Nd2O3) is traditional method.In recent years,in order to reduce the cost of production,some enterprises selected ammonium hydrogen carbonate as precipitator.However,a part of physical properties of neodymia produced by this method can′t reach the consumer′s requirement.By means of making an intensive study on the technology about making neodymia via oxalic acid precipitation method,it was found that the product performances were totally identical while using mixed oxalic acid and ammonia as precipitator comparing with using single oxalic acid as precipitator.Meanwhile unit consumption of oxalic acid could be dropped by 0.32 kg/kg (Nd2O3),cost of production could be dropped by 3 240 yuan per ton,and yield of neodymia could be risen by 0.8%.So the method of using mixed precipitator has obvious economic benefits.