采用N235从镍钼矿盐酸浸出液中萃取钼的研究

采用N235对镍钼矿盐酸浸出液进行了萃取钼的研究。试验结果表明,在最佳工艺条件下,5级逆流钼萃取率可达98%以上,镍损失率小于1%,负载有机相经稀酸洗涤除铁后采用氨水反萃,1级反萃率达97%以上,反萃液钼浓度为50 g/L左右,达到了钼镍分离及钼富集转型的目的。     

HBL101从镍钼矿焙烧料高酸浸出液中直接萃取钼的研究

采用新型萃取剂HBL101从镍钼矿焙烧料高酸浸出液中直接萃取钼。考察有机相组成、料液酸度、相比、振荡频率、平衡时间、温度对钼萃取过程的影响,并绘制了HBL101萃钼等温曲线。结果表明,在优化的工艺条件下,钼萃取率达96.8%以上,有机相饱和容量为12.09g/L;负载有机相用纯水洗涤后经3级逆流氨水反萃,钼反萃率达99.9%以上,实现了钼镍分离及钼的富集转型。     

从石煤酸浸液中萃取分离钒钼

采用P204作为萃取剂富集分离石煤酸浸液中的钒和钼,考察了溶液pH值、反萃剂种类、反萃剂浓度、反萃相比对钒钼富集分离的影响.研究结果表明：经过Na2S2O3还原后的溶液,钒的萃取率可以达到84.1%,钼的萃取率可以达到81.1%;采用1.5 mol/L的硫酸溶液反萃负载钒和钼的有机相,钒的反萃率可以达到99%以上,钼不能被反萃;在O/A为（体积比）3∶1的条件下采用60 g/L的碳酸氢铵溶液可以将钼反萃,其反萃率为76.4%.采用不同的反萃剂,可以实现钒和钼的分离.     

废炼油催化剂酸浸液中镍的选择性萃取

针对废炼油催化剂酸浸液中的镍,研究了以HBL110为萃取剂进行直接选择性萃取。优化了萃取剂皂化率、萃取剂浓度、萃取平衡时间,确定了萃取与反萃取级数,并进行了实验室多级逆流串联萃取模拟试验及线上流程的连续萃取试验。结果表明：在皂化率40%、HBL110浓度25%、萃取时间10 min条件下,经五级逆流萃取,萃余液中镍质量浓度低于30 mg/L,镍萃取率达98%以上,Al、Fe萃取率低于3%;以75 g/L硫酸对镍负载有机相进行三级逆流反萃取可100%实现镍的反萃取;对废催化剂酸浸液进行线上萃取流程连续运行5 d,萃余液中镍质量浓度稳定在5 mg/L,镍萃取率达99%,反萃取液中镍质量浓度稳定在8 g/L,镍反萃取率为100%,有机相可以实现有效的循环再利用。     

从镍钼矿酸浸液中萃取钼的工艺研究

研究了异辛醇、仲辛醇、TBP和酒精作为改性剂对N235从镍钼矿酸浸液中萃取Mo的作用,并确定了最佳萃取温度和时间以及反萃剂浓度和反萃时间。结果表明,TBP消除萃取过程所产生第三相的效果最佳,是最适宜的改性剂。最佳萃取体系组成(体积分数)为20%N235+20%TBP+煤油,该萃取体系在20℃时萃Mo效果最佳,60s内即达到萃取平衡;经三级逆流萃取后,该萃取体系对Mo的萃取率为98.84%。反萃剂氨水的最佳浓度为8mol/L,反萃达到平衡所需时间为5min;经两级逆流反萃后,氨水可将99%以上的Mo反萃下来。     

钼精矿氨加压浸出钼铼分离试验研究

通过对某企业自产钼精矿进行氨加压浸出依赖性参数试验研究和分析,得出了优化条件。综合试验表明,钼精矿经氨加压浸出后,钼、铼、铜的浸出率分别可达96%、98%和60%以上。氨浸液经酸沉后,钼酸铵结晶率可达98%以上。溶剂萃取试验表明,含铼滤液通过两段萃取和反萃取后,铜、钼、铼将得到彻底分离,铼的萃取率可达98%以上,经二次反萃之后,溶液中铼可富集到20 g/L以上,为铼的进一步提纯创造了有利条件。     

钒渣无焙烧酸浸液萃取分离试验研究

系统研究了转炉钒渣无焙烧酸浸液中钒与铁的萃取分离情况。进行萃取-反萃单因素试验,分别考察萃取温度、初始p H值,萃取剂组成、萃取相比,萃取、反萃时间,反萃剂浓度、反萃相比等因素对萃取和反萃结果的影响。萃取试验结果表明:在常温(20℃),浸出液p H2.0,有机相组成20%P204+5%TBP+75%磺化煤油,相比(O/A)1∶1,震荡时间5 min条件下,钒的一级萃取率达到74.49%,铁的萃取率仅为1.92%,其他离子不进入有机相;该条件下进行四级错流萃取,钒的总萃取率可达97.89%。反萃试验结果表明:反萃时间4 min,反萃剂浓度200g/L,反萃相比(O/A)5∶1时,钒的反萃率达98.58%,有机相中的铁不进入反萃水相,提钒酸浸液得到净化。     

石煤氧压酸浸液萃钒除铁工艺研究

研究了从石煤氧压酸浸液中萃钒除铁的工艺过程,从萃取和反萃的相比、试剂组成、pH值、澄清时间等方面进行了详细试验.研究表明:浸出液经中和还原处理后,采用10%P204+5%TBP+85%煤油萃取钒时.经六级逆流萃取后萃取率为95%以上;负载有机相用15%H2SO4反萃时,经五级逆流反萃后反萃率可达99%以上.经萃取后,浸出液中的钒可富集到37 g·L-1以上,铁可缩减至以O.6 g·L-1以下,反萃水相中钒铁质量比大于60,钒铁分离效果较好.     

从铀钼矿石碱浸液中分离铀钼试验研究

研究了从某铀钼矿石碱浸液中分离回收钼和铀,确定了碱浸液酸化—溶剂萃取钼—沉淀钼、铀工艺流程,考察了萃原液酸度、酸洗相比等参数对铀、钼分离的影响,绘制了钼萃取平衡曲线。试验结果表明:碱浸液酸化至pH=2.5,用三脂肪胺萃取钼、硫酸洗涤负载有机相,可以实现钼与铀的分离,反萃取液可直接沉淀钼,钼萃余水相可直接沉淀铀产品。     

全湿法处理钼镍矿的新工艺

本文针对钼镍矿难处理的技术现状,提出了一种加压酸浸、常压碱浸、萃取相结合的全湿法处理镍钼矿的新工艺。试验结果表明,在加压酸浸时,钼的转化率可以达到98.3%以上,镍的浸出率达到98.7%。经过碱浸、萃取后钼镍综合回收率达92%以上。     

硫酸钴浸出液中用N902萃取铜生产试验研究

采用N902对硫酸钴浸出液中铜的萃取进行了研究,考察了萃取相比（O∶A）、萃原液中铜含量、萃取时间对铜萃取率的影响,以及反萃相比（O∶A）、反萃时间、酸度、反萃液铜浓度对铜反萃率的影响,确定了适宜的铜萃取生产条件,当铜离子浓度为6～7g/L时,用15%的N902萃取硫酸介质中的铜,1级铜萃取率可达95%;用新配制的200 g/L的硫酸对负载铜有机相进行循环反萃,1级铜反萃率可达95%。     

Extraction of molybdenum from acidic leach solution of Ni–Mo ore by solvent extraction using tertiary amine N235

Tertiary amine N235 diluted with sulphonated kerosene containing sec-octyl alcohol as a phase modifier was used to directly extract molybdenum from the acidic leach solution of Ni–Mo ore. The results indicated that the extraction of molybdenum can reach more than 88% using a solvent extraction system consisting of 10?vol.-% N235 and 10?vol.-% sec-octyl alcohol in sulphonated kerosene with an O/A ratio of 1:2 at room temperature for 20?min. The extracted molybdenum species of Mo₇O₂₁(OH)₃^3–, MoO₂(SO₄)₂^2– and MoO₂(HSO₄)₄^2– in loaded organic phase were identified, and the predominant species was Mo₇O₂₁(OH)₃^3–. Molybdenum in the loaded organic phase can be stripped with ammonia solution, and the stripping of molybdenum can reach 95.8% at an O/A ratio of 7:1, phase contact time of 10?min, and the ammonia concentration of 6?mol?L^?1.     

Hydrometallurgical Process for Copper Recovery from Waste Printed Circuit Boards (PCBs)

Present paper focuses on the selective recovery of copper from the enriched ground printed circuit boards (PCBs) using leaching and solvent extraction. The metal-enriched ground sample obtained from the beneficiation of the sized PCBs in a laboratory scale column type air separator contained mainly 49.3% Cu, 3.83% Fe, 1.51% Ni, 5.45% Sn, 4.71% Pb, and 1.85% Zn. The leaching of the enriched sample with 3.5 mol/L nitric acid dissolved 99% copper along with other metals at 323 K temperature and 120 g/L pulp density in 1 h time. The composition of the leach liquor with wash solution was found to be 42.11 g/L Cu, 2.12 g/L Fe, 4.02 g/L Pb, 1.58 g/L Zn, and 0.4 g/L Ni. The McCabe–Thiele plot indicated the requirements of three counter-current stages for maximum extraction of copper from the leach liquor at pH 1.5 using 30, 40, and 50% (v/v) LIX 984 N at the phase ratios (A/O) of 1:3, 1:2, and 1:1.5, respectively. The counter-current simulation studies show the selective extraction of 99.7% copper from the leach liquor feed of 1.5 pH in three stages with 50% LIX 984 N at A/O phase ratio of 1:1.5. The stripping of copper from the loaded organic with sulfuric acid produced copper sulfate solution from which copper metal/powder could be recovered by electrolysis/ hydrogen reduction.     

N235萃取脱除锌溶液中氟氯

采用N235萃取含氟、氯的锌浸出液,氟、氯被萃取到有机相中,锌留存于萃余液中,锌萃取率低于5%,氟脱除率高于80%,氯脱除率高于94%。在N235有机相中加入异辛醇,萃取、水洗、反萃温度控制在40~45℃,可避免出现有机相乳化和分相时间长的问题。萃余液中锌、氟、氯浓度分别为55.54、0.011、0.082 g/L,可返回锌冶炼系统配入浸出、净化或送锌电解配液。     

P507+N235双溶剂萃取除铁生产实践

介绍了在硫酸介质中使用P507+N235双溶剂萃取体系萃取除铁的工艺应用。通过生产实践发现,铁以三价态被萃取,有机相由15%P507+5%N235+80%260#稀释剂组成,相比2∶1,铁萃取率达到98%以上,在反萃剂为250g/L稀硫酸溶液,相比4∶1的条件下反萃,铁反萃率达到98%以上,反萃液经均相渗析膜分离回收酸,渗析残液通过控制pH,可采用铁矾法、中和除铁和砷酸铁等工艺除铁,铁脱除率均可达到90%以上。     

攀枝花硫钴精矿浸出净化液镍钴分离及钴产品制备的试验研究

本文介绍了攀枝花硫钴精矿浸出净化液镍钴分离及钴产品制备的试验研究。钴镍分离采用P507萃取，钴的萃取率大于99．5％，镍的萃取率在0．01％以下。有机相用硫酸反萃得到硫酸钴溶液，用盐酸反萃得到氯化钴溶液。由氯化钴溶液可制取纯氧化钴粉；由硫酸钴溶液可制备结晶硫酸钴；由萃余液可沉淀出碳酸镍粗产品。     

Separation of trivalent rare earths from nitrate medium using solvent extraction with a novel extractant 2-ethylhexyl ((2-ethylhexylamino)methyl) phosphonic acid

By introducing the amine group into the structure of P227, a novel extractant 2-ethylhexyl ((2-ethylhexylamino)methyl) phosphonic acid (EEAMPA, abbreviated as HA) was synthesized for the extraction and separation of trivalent rare earths (REs) from nitrate medium. The influence factors including extractant concentration, equilibrium time, HNO₃ concentration, separation factors, cycle regeneration, stripping acidity, and actual leach liquor of metal ions, were studied systematically. The results show that the extraction ability of EEAMPA for REs decreases with increasing acidity. A possible extraction mechanism is proposed and the extracted species as REHA₃(NO₃) are confirmed by the slope analysis method. The extraction equilibrium can reach faster than P227. It shows good chemical stability and cycling regeneration. Stripping studies show that HCl is an excellent stripping agent and REs can be effectively stripped from the organic phase.     

从贫锰矿中提取钪的试验研究

试验采用化学处理方法，通过硫酸浸出、浸出液萃取、有机相提取钪，萃取余液回收钴镍，净化液制碳酸锰。获得粗钪品位Ｓｃ２Ｏ３９６．７５％，回收率７５．５７％；钴镍混合精矿回收率８０％；碳酸锰含锰４３．７３％，回收率９０％。