CN1097637C - 从碱性氰化液中萃取金的方法 - Google Patents
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Abstract
从碱性氰化液中萃取金的方法。金以氰化亚金配合物形式存在,溶液PH值9-12,温度10-50℃,向水相溶液中加入表面活性剂做添加剂,用含磷类萃取剂如磷酸三丁酯或亚砜类萃取剂如二异辛基亚砜的磺化煤油溶液或正烷烃溶液中任选一种做萃取剂,一级萃取率>96%。
Description
从碱性氰化液中萃取金的方法。本发明是属于贵金属冶金。
本发明的目的是研究探索出碱性氰化亚金配离子选择性较好,值较高,能在碱性溶液中萃取金的萃取剂体系和方法。
本发明的技术方法,其特征是水相溶液中,金以氰化亚金配合物形式存在,萃取剂为从磷酸三丁酯或二异辛基亚砜中任选一种,稀释剂为从磺化煤油或正烷烃中任选一种,在萃取金前,先向水相溶液中加入表面活性剂溶液,表面活性剂的分子结构是阳离子带有体积庞大的疏水基,阴离子为卤素负离子或硫酸根,疏水基可以是直链或支链烷烃,或带芳环,吡啶环及杂环的有机机团,其分子式为Rn(CH3)4-nN+X-(n=1-3),
N+X-,表面活性剂可从卤化十六烷基三甲基胺、卤化十八烷基三甲基胺、卤化十六烷基吡啶中任选一种,表面活性剂配为水或乙醇溶液,按mol比(β)表面活性剂:氰化亚金=1-2∶1加入水相溶液,萃取条件为:水相溶液pH值=9-12,温度10-50℃,混相时间2-10分钟,一级萃取,金萃取率均为96-99%,金萃取容量38g/L-50g/L。若不加表面活性剂,在pH10.5,纯磷酸三丁酯萃取氰化亚金的萃取率仅60%左右,加入50%正十二烷稀释剂,金萃取率降到20%,都不能定量萃取。
结合附图说明发明的特点。由图1说明,不加添加剂时,纯TBP的萃取率(E)在pH=6左右出现凹谷,低至60%左右,加入添加剂后,在pH=2-12范围内,萃取率均>99.8%。由图2说明,不加添加剂,在pH=3-13范围,金萃取率<30%,加入添加剂,萃取率提高至>96%。由图3说明,无添加剂时,金的萃取率很低,即便100%TBP也仅50%左右,加添加剂后,TBP浓度在10%以上后,金萃取率均>99%。由图4看出,固定待萃液浓度,随添加剂用量上升,金萃取率呈直线上升。
本发明的优点是:1、能在碱性氰化液中定量萃取金,萃取pH范围较广,萃取饱和容量高,2、萃取反应动力学速度快,几分钟即达平衡,有利于工业实现和缩短流程。3、可以采用小体积有机相处理大体积水相,有利于采用适宜的萃取设备,4、采用的表面活性剂和萃取剂为一般试剂,价格较便宜,工业应用成本较低。
附图说明:图1为不同pH值时,用溴化十六烷基三甲基胺(ST)做添加剂,其用量对磷酸三丁酯(TBP)萃取金的影响,图2为平衡pH对有无添加剂溴化十六烷基吡啶(SP)时金萃取率的影响,图3为有无添加剂ST时,TBP浓度(正十二烷做稀释剂)对金萃取率影响,图4表明了在平衡pH10.5时ST添加剂用量对TBP萃取金的影响。
实施例:
实施例1用化学试剂合成含有Au、Cu、Ni、Zn、Ag、Fe等元素的氰化液,调整pH=10.5,表面活性剂为氯化十六烷基三甲胺,按mpl比(β)表面活性剂:金=1.1∶1将氯化十六烷基三甲铵加入氰化液中,用50%磷酸三丁酯+50%正十二烷作有机相,相比=1∶1,室温下混相10分钟,萃取结果列入表中,
表1合成样萃取结果待萃液组分 Au Ag Cu Ni Zn Fe金属浓度(mg/l) 1944.0 455.5 257.0 102.0 168.5 94.0萃残液金属浓度(mg/l) 2.5 455.5 256.0 102.0 168.4 94.0萃取率(%) 99.9 0 0 0 0 0
实施例2料液为载金炭氰化物解吸液,表面活性剂及萃取剂、萃取条件同例
1.结果列入表2
表2 载金炭氰化物解吸液的萃取结果待萃液组分 Au Ag CU Ni Zn Fe金属浓度(mg/l) 2846.0 72.0 118.0 740.0 11.0 144.0萃残液金属浓度(mg/l) 1.0 72.0 118.6 741.0 11.0 144.0萃取率(%) >99.9 0 0 0 0 0
从例1和例2看出,金的一次萃取率99.9%,且有很高选择性。
实施例3料液为镀金用氰化物废液,只含金,表面活性剂及萃取剂、萃取条件同例1,萃取结果为:料液含Au 6870.0mg/l,萃残液含Au 2.1mg/l,萃取率为99.97%。
实施例4料液为氰亚金酸钾KAu(CN)2溶液,萃取剂为30%磷酸三丁酯+70%磺化煤油溶液,表面活性剂添加剂为溴化十六烷基吡啶,调溶液pH=10.5,一组萃取,按mol比(β)表面活性剂:金=1.05∶1将表面活性剂加入水相,混相时间5分钟,温度室温,一级萃取率>98%。
实施例5料液为氰亚金酸钾KAu(CN)2溶液,金浓度0.2g/l,萃取剂为20%二异辛基亚砜+80%正十二烷(体积比)溶液,表面活性剂添加剂为溴化十六烷基吡啶,调溶液pH=10.3,按mol比(β),表面活性剂:金=1∶1将表面活性剂加入水相,混相时间6分钟,一级萃取,金萃取率97.50%。
Claims (1)
1、从碱性氰化液中萃取金的方法,其特征是金以氰化亚金配合物形式存在于水溶液中,萃取剂为从磷酸三丁酯或二异辛基亚砜中任选一种,稀释剂为从磺化煤油或正烷烃中任选一种,在萃取金前,先向水相溶液中加入表面活性剂溶液,表面活性剂为从卤化十六烷基三甲基胺、卤化十八烷基三甲基胺、卤化十六烷基吡啶中任选一种,表面活性剂配为水或乙醇溶液,按mol比表面活性剂:氰化亚金=1-2∶1加入水相溶液,萃取条件为:水相溶液pH值=9-12,温度10-50℃,混相时间2-10分钟。
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CN101603123B (zh) * | 2009-06-26 | 2011-04-20 | 云南大学 | 用大孔吸附树脂从碱性氰化液中固相萃取金的方法 |
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