共查询到19条相似文献,搜索用时 171 毫秒
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研究使用P204[二-(2-乙基己基)磷酸]与NSpa(芳香酯类萃取剂)进行协同萃取,以除去磷酸中的铁杂质。考察了萃取剂配比、相比(有机相与水相的体积比)、萃取时间、萃取温度、震荡转速等因素对磷酸中铁萃取率的影响。实验结果表明,铁的单级萃取率最高可达83.93%。实验条件:萃取时间为50 min,萃取温度为303 K,震荡转速为200 r/min,萃取剂配比为0.6 mol/L NSpa、1.4 mol/L P204,相比为5∶1,使用磺化煤油作为稀释剂。这一研究结果对于高浓度磷酸的净化与杂质铁的回收及综合利用具有重要价值。 相似文献
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泡沫浮选萃取法分离精氨酸 总被引:1,自引:0,他引:1
以精氨酸水溶液为研究体系,采用十二烷基苯磺酸为起泡剂,以二(2-乙基已基)磷酸(P204)为萃取剂,对泡沫浮选萃取法分离提取水溶液中微量精氨酸的工艺进行了研究,考察了溶液中pH、鼓泡气体流量、表面活性剂浓度、萃取剂浓度的影响.结果表明在常温条件下,水相初始pH为7.0,萃取剂P204(稀释剂:正庚烷)体积分数为30%,水相和有机相的相比为17:1,十二烷基苯磺酸浓度为0.15 g/L,气体流量为200 mL/min时,溶液中精氨酸能达到满意的分离效果(富集比16.2,回收率97.2%). 相似文献
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赤泥是铝土矿生产氧化铝过程中产生的固体残渣,含有铁、硅、铝、钛及稀土等多种有价组分。在已预先分离赤泥中大部分铁、硅、铝、钛的前提下,采取溶剂萃取的方式对赤泥磷酸浸出液中的稀土作进一步分离与纯化,研究了在中性磷型萃取剂TBP、酸性磷型萃取剂P204和P507分别作用下,稀土La、Ce、Sc、Y以及主要杂质组分Al、Fe、Ti、Ca的萃取行为,结果表明:TBP对稀土的萃取效果较差,P507对稀土Sc、Y及杂质Fe、Ti的萃取能力较强,P204萃取稀土的能力优于P507;采用质量分数2%P204作为萃取剂,在溶液pH为1.5、相比为1∶3的条件下,磷酸浸出液中Sc、Y的萃取率分别为90%、99%,La、Ce及杂质Fe、Al、Ti、Ca萃取率均低于5%;将P204质量分数升至20%,La、Ce萃取率可分别达到85%、95%。因此可通过采用P204分步萃取的方式有效分离磷酸浸出液中的稀土。 相似文献
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研究了以N205为表面活性剂,磺酸基络合剂为流动载体,液体石蜡为膜增强剂,磺化煤油为膜溶剂,盐酸加氯化钠为内水相的乳状液膜在湿法磷酸体系中捕获镁离子时的稳定性。结果表明,表面活性剂用量、内水相反萃剂浓度、萃取时间、萃取转速等对液膜的稳定性均有显著影响。在一定的范围内,随着表面活性剂用量的增加,液膜的稳定性增加。适宜的操作条件为:在1 000 r/min下加内水相,3 000 r/min下制乳15 min,萃取转速为200 r/min。 相似文献
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该文介绍了乳状液膜法分离富集废旧镍镉电池中的镉离子。乳状液膜主要由溶剂(煤油)、表面活性剂(Span80)、载体〔二(2-乙基己基)膦酸,P204〕和内水相氨水组成。对影响镉离子渗透和分离过程的重要变量进行了考察,分析了乳状液膜的载体体积分数、外水相pH、搅拌时间、乳水比(乳液与外水相体积比)及Span80体积分数对镍镉分离效果的影响,从而选择出最佳的分离条件为:φ(P204)=4.4%,φ(Span80)=8.8%,pH=5.5,乳水比0.5,搅拌时间10min。用此乳状液膜进行100L反应釜的工业放大实验,镉的迁移率可达93.3%,而镍的迁移率仅为14.6%。 相似文献
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Experiments were conducted to investigate the separation of cadmium(II) from spent nickel/cadmium battery by emulsion liquid membrane. Liquid membrane mainly consisted of a diluent (kerosene), a surfactant (Span 80), a carrier (di(2‐ethylhexyl) phosphoric acid, D2EHPA) and an internal phase (sulfuric acid). Main research effort was focused on the identification of optimal parameters affecting the separation process, such as D2EHPA (4.4 vol%), Span 80 (6.6 vol%), pH in the external phase (3.0), treat ratio (0.4), agitation time (10 min), and sulfuric acid concentration (1500 mol / m3). With the selected emulsion liquid membrane to separate cadmium(II) from the leaching solution of spent nickel/cadmium battery, the fraction extracted of cadmium(II) ions (0.963) was much more than that of nickel(II) ions (0.026). The organic membrane phase after demulsification was re‐mulsification and recycled up to eight times. 相似文献
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湿法磷酸中有机物的脱除方法 总被引:1,自引:0,他引:1
湿法磷酸中含有多种杂质,有机杂质是其中的一种。介绍了采用活性炭和化学氧化相结合脱除湿法磷酸中有机杂质的方法,分别研究了试剂用量、反应温度、反应时间和搅拌速度对脱除湿法磷酸中有机杂质的影响。结果表明,采用活性炭吸附和化学氧化相结合的方法脱除湿法磷酸中的有机杂质,最显著的影响因素为活性炭用量和双氧水用量;在最佳工艺条件下,该法可以脱除湿法磷酸中80.2%的有机杂质,净化后磷酸中残余的有机杂质含量低于食品级磷酸对有机杂质所要求的含量。该方法是脱除湿法磷酸中有机杂质的有效方法。 相似文献
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The novelty of this work is the selective extraction of bismuth ions from nitrate medium by emulsion liquid membrane. Di(2-ethylhexyl)phosphoric acid was used as extractant of bismuth ions from nitrate medium by emulsion liquid membrane, and Triton X-100 was used as the biodegradable surfactant in n-pantanol n-pentanol bulk membrane. The extraction of bismuth ions was evaluated by the yield of extraction. The experimental parameters were evaluated and were optimized. They included the ratio of di(2-ethylhexyl)phosphoric acid concentration to the concentration of /Triton X-100 concentration (1.0: 0.5% w/w), nature of diluents (n-pentanol), nature and concentration of the stripping solution (sulfuric acid, 0.5M), stirring speed (1,800 rpm) and equilibrium time of extraction (20min), initial feed solution of bismuth (350 ppm) and the volume ratio of the internal stripping phase to the membrane phase (14 times). The experimental parameters of kinetic extraction revealed that the bismuth ions were extracted at 100% 97%. 相似文献
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Di(2-ethylhexyl)phosphoric acid was used as extractant of bismuth ions from nitrate medium by emulsion liquid membrane, with Triton X-100 as the biodegradable surfactant in n-pentanol bulk membrane. The novelties and innovative points of this work are the application of emulsion liquid membrane for selective and efficient extraction of bismuth ions as wel as the relevant optimization procedures. The extraction of bismuth ions was evaluated by the yield of extraction. The experimental parameters were evaluated and optimized, including the ratio of di(2-ethylhexyl)phosphoric acid mass concentration to Triton X-100 (1.0%:0.5%), nature of diluent (n-pentanol), nature and concentration of stripping solution (sulfuric acid, 0.5 mol·L?1), stirring speed (1800 r·min?1) and equilibrium time of extraction (20 min), initial feed solution of bismuth (350 mg·L?1) and the volume ratio of internal stripping phase to membrane phase (14). The experimental parameters of kinetic extraction reveal that the bismuth ions can be extracted by 100%. 相似文献
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T-154为载体的微乳液膜处理焦化厂含酚废水 总被引:6,自引:0,他引:6
研究了以T-154为载体的P204/煤油/NaOH微乳液膜配方及其稳定性。采用该液膜体系处理含酚废水,探讨了载体浓度、分离时间、乳水比、油相的重复使用次数等对除酚率的影响。结果表明,微乳液膜不仅稳定性好,分离速度快,除酚效率高,而且可自动破乳,油相可重复使用。当T-154在油相中的质量浓度为5%,分离时间为20m in,乳水比为1∶4,废水的pH值为5时,一次性除酚率达99.95%。将该微乳体系用于处理某焦化厂中高浓度的含酚废水,一次性除酚率均高于97%,且对高浓度含酚废水的除酚效果更佳。 相似文献