某废旧高温合金浸出液净化工艺研究

摘要

The leachate of a nickel-base superalloy scrap containing a large quantity of impurities, such as Cr、Al、Fe, was treated by adopting the process of hydrolysis precipitation-extraction for impurities removal. In the preliminary process for removing impurities, hydrolysis at a temperature of 80℃, with dosage of oxidant at 30, concentration of NaOH at 10%, and pH=4.5 at the terminal of hydrolysis, with mechanical stirring speed at 300 r/min, removal rate of Cr, Al, Fe were 97.8%, 98.6% and 99.0%, respectively. Then, a further extraction process adopted 10-stage countercurrent extraction at room temperature, with the volume fraction of P204 at 15%, addition of Butanol around 5%, O/A=1/2, initial pH=1.0 for extraction, removal rate of Cr, Al, Fe reached 93.8%, 90.0%and 92.0%, respectively, after extraction for 2 min. This technique not only realized removing of Cr, Al and Fe impurities from Ni and Co, but also the liquid after impurity removal can be directly subjected to Ni/Co separation process for recovery of Ni and Co.%某镍基废旧高温合金酸浸液中含有Cr、Al、Fe等杂质元素，采用“水解沉淀初步除杂-萃取深度除杂”法处理此浸出液。水解初步除杂过程中，水解温度为80℃，氧化剂用量系数为30，NaOH浓度为10％，水解终点pH＝4．5，机械搅拌速率为300 r/min， Cr、Al、Fe的除杂率分别为97．8％、98．6％和99％；萃取深度除杂过程中采用常温下10级逆流萃取，P204的浓度为15％，正丁醇加入量为5％，萃取相比O/A＝1/2，萃取初始pH＝1．0，萃取时间2 min时， Cr、Al、Fe除杂率分别为93．8％、90％和92．0％。该工艺有效实现了杂质Cr、Al、Fe与Ni、Co的分离，除杂后液可直接进行镍钴分离，回收镍、钴。