摘要
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。
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.
出处
《矿冶工程》
CAS
CSCD
北大核心
2014年第4期70-74,共5页
Mining and Metallurgical Engineering
基金
国家科技部高技术研究发展计划(2012AA063204)
关键词
废旧高温合金
净化
水解
萃取
镍
铬
superalloy scrap
purify
hydrolysis
extraction
Ni
Co
