特种树脂吸附沉淀法从钨酸铵溶液中分离钼的研究

以某厂含钼5.0～6.0 g/L、WO3为120～160 g/L的反萃液为原料液,经硫化后,加入一种国产的特种树脂进行吸附沉淀除钼。研究了料液pH、树脂可交换活性基团、反应固液以及反应时间对钨钼分离效果的影响,研究了除钼反应后WO3的洗脱和树脂的解吸,以及特种树脂的循环使用性能。结果表明:除钼反应前无需调节料液pH;Cl型树脂的钨钼分离效果优于CO3型树脂;增加反应固液比能提高钨钼分离效果;最佳除钼反应时间为2.5 h;除钼反应后增加洗脱步骤可以显著提高WO3收率。在最佳条件下,特种树脂的除钼率可达96%～97%,WO3回收率96%～98%,除钼后溶液中Mo/WO3低于0.2%,钨钼分离系数稳定在30左右,钨钼分离效果良好。

Study on Separation Molybdenum with Special Resin Adsorption Precipitation Method from Ammonium Tungstate Solution

special resin was used to remove molybdenum from a sulfurized strip liquor containing 5.0～6.0 g/L Mo and 120～160 g/L WO3 by adsorption precipitation.The effects of pH value of feed solution,the function group of resin,the solid/liquor ratio and the time of reaction on the separation of molybdenum and tungsten were investigated.In addition,the elution of WO3 after removing molybdenum,desorption of loaded resin and reusability of resin was also studied.The results showed that the feed solution can be directly treated without pH adjustment.The resin with Cl-type exhibited a better performance than resin with CO3-type on the separation of molybdenum and tungsten.The increase of solid/liquor ratio also improved the separation of both metals.The best reaction time for removing molybdenum was 2.5 hours.The recovery of WO3 was sharply increased with the increase of elution times after removing molybdenum.More than 96% of Mo was removed and around 98% of WO3 was recovered using the resin under optimum condition with a very good separation result of molybdenum and tungsten.