废氨水洗涤N1923负载有机相降钼试验研究

Experimental Study on Reducing Molybdenum by Washing N1923 Loaded Organic Phase with Waste Ammonia Water

N1923+异辛醇+磺化煤油体系萃取的负载有机相中,低钨钼比是制约后续反萃液中钨钼蒸发结晶分离效率的关键因素。研究了用车间废氨水作为洗涤剂,从N1923负载有机相中洗脱钼,提高钨钼比的工艺方法;考察了pH值、反应温度、反应时间、水油比对钼洗脱率的影响。结果表明:在pH=9.0、反应温度25℃、反应时间25 min、水油比4∶1、静置时间10 min条件下,钼的单极洗脱率高达88.18%。对洗脱后的负载有机相进行二级逆流洗涤,发现继续增加洗涤次数对钼洗脱率影响甚微。采用车间废氨水洗涤N1923负载有机相提高钨钼比经济可行、环境友好、简单有效、钼洗脱率高、钨损失少。本研究对N1923负载有机相中钨钼分离具有一定参考意义。

In the loaded organic phase extracted by N1923+isooctanol+sulphonated kerosene system,the low W/Mo ratio was the key factor limiting the separation efficiency of evaporative crystallization of W/Mo in the subsequent strip liquor.The process of eluting molybdenum from N1923 loaded organic phase by using workshop waste ammonia water as detergent to improve the W/Mo ratio was studied.The effects of pH value,reaction temperature,reaction time,and water to oil ratio on molybdenum elution rate were also investigated.The results show that under the conditions of pH=9.0,reaction temperature of 25℃,reaction time of 25 min,water to oil ratio of 4∶1,and standing time of 10 min,the unipolar elution rate of molybdenum reaches 88.18%.The secondary countercurrent washing of the eluted organic phase is found to have little effect on the elution rate of molybdenum with the increase of washing times.Using workshop waste ammonia water to wash the N1923 loaded organic phase to improve the W/Mo ratio is economically feasible,environmentally friendly,simple and effective,with high molybdenum elution rate and less tungsten loss.This study has certain reference significance for the separation of tungsten and molybdenum in the N1923 loaded organic phase.