摘要
由于催化剂损耗,某大型环氧丙烷生产废液中含Mo 4.97 g/L,主要以钼酸铵的形式分散于有机相中。由于钼酸铵与乙二醇和水形成较稳定的络合物而难以分离,使得钼金属的回收难度较大。本文采用氨水反萃-硝酸铅沉淀法处理该含钼废液,在最佳工艺条件下,即Pb∶Mo(摩尔比)为1.5∶1、氨水体积∶废液体积为1∶2、氨水初始浓度为7%、反应温度为40℃、反应时间20 min条件下,可获得含钼23.37%的产品,且钼的回收率达到98.44%。
; A large epoxy propane production waste water contains 4. 97 g/L of molybdenum, and molybdenum is mainly in the form of ammonium molybdate dispersed in the organic phase. Due to ammonium molybdate and ethyl-ene glycol and water to form a stable coordination compound and hard to separate, making molybdenum metal recy-cling is difficult. The method of ammonia reverse extraction- lead nitrate precipitation was used to deal with the mo-lybdenum waste water. Results showed that under the optimum process conditions, i. e. ,Pb Mo （ mole ratio） is 1.5＊1, ammonia volume＊ liquid volume is 1 ： 2, the initial concentration of ammonia is 4 % , reaction temperature is 40 ° C,reaction time is 20 min, it can obtain products containing 23. 3 7 % molybdenum, and recovery of molybde-num is 98. 44%.
出处
《中国钼业》
2017年第1期5-7,共3页
China Molybdenum Industry
关键词
环氧丙烷
钼基催化剂
反萃
沉淀
epoxy propane
molybdenum catalysts
reverse extraction
precipitation
