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7804螯合萃取剂对铜铁钴镍萃取性能的研究 总被引:3,自引:0,他引:3
本文研究了新型羟肟萃取剂7804对Cu(Ⅱ)、Ni(Ⅱ)、Co(Ⅱ)和Fe(Ⅲ)等在酸性和氨性硫酸盐体系中的萃取性能,并用它实现了混合液中铜镍的分离。 相似文献
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萃取光度法测定微量铜 总被引:3,自引:0,他引:3
以三氯甲烷作萃取剂,PAN作显色剂,通过光度法测定镀铜废水中的微量铜,选择了适合的测量波长,讨论了酸度,萃取剂用量及振荡时间对萃取率的影响,分析了干扰元素的影响及消除,该方法准确度高,可测量0.01-1.00μg/mL的微量铜。 相似文献
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铜工业萃取剂及其应用 总被引:1,自引:0,他引:1
本文详述了国内外用于湿法冶金的铜萃取剂的研制进展,介绍了萃取剂的性能及其在铜的浸出-溶剂萃取-电积法提取工艺中的应用情况;指出浸出-溶剂萃取-电积(L-SX-EW)技术在我国铜工业领域中的前景十分广阔。 相似文献
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协同萃取剂负载泡沫塑料萃取微量稀土素的性能研究 总被引:1,自引:0,他引:1
本文提出了一个新的萃取稀土元素的方法。以1-苯基-3-甲基-4-苯甲酰-吡唑啉酮(5)(PMBP)为萃取剂,以磷酸三丁酯(TBP)为协萃剂,并负载在泡沫塑料上,从大体积水相中萃取微量Sm、Eu、Gd。其协萃剂重量比为3:7,水相酸度为pH=3时,分配比为7.29X10~4,萃取百分率为98%。 相似文献
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《Journal of the European Ceramic Society》2022,42(5):2449-2463
Although phase relations in the Na2O-CaO-SiO2 system are vital to melting and thermal treatments in glass and glass-ceramics industries, the available data for thermodynamic modeling are mostly based on reports published in 1920s and 1950s. The present investigation verifies the formation of solid solutions of Na2CaSiO4 and Na2Ca2Si2O7 which have previously assumed to be stoichiometric compounds. The impact of these solid solutions on the features of the phase diagram were investigated using the equilibration-quenching-EDS/EPMA technique. The data were reported as liquidus projections and in isothermal sections within the temperature range of 1000 and 1400 °C. Ten primary phase fields were identified, namely SiO2, Na2Ca3Si6O16, combeite, Na4CaSi3O9ss, CaSiO3, Na2CaSiO4ss, Na2Ca2Si2O7ss, Na2Ca6Si4O15, Ca3Si2O7 and Ca2SiO4. In addition, some novel liquidus data and invariants points were examined in more detail. The fundamental data obtained can be employed for the thermodynamic reassessment of the Na2O-CaO-SiO2 system. The present study also discusses the findings and their impact on melting and annealing processes during the manufacture of glass and glass-ceramics. 相似文献
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《Ceramics International》2023,49(4):6113-6118
The present work adopts a combination of theoretical calculation and experiment. Firstly, the Gibbs free energy enthalpy change of Ti doped B4C/Al composites is calculated by thermodynamic principle, revealing the principle that Ti will preferentially combine with Al and B4C to form TiB2 with excellent performance. Secondly, with the help of spark plasma sintering (SPS) process, pure Al and 4 vol%Ti–Al was used to discuss the degree of interfacial reaction and diffusion between Al–B4C and Ti/Al–B4C. It is found that the addition of Ti effectively inhibits the interfacial reaction between Al–B4C. The kinetic equation of Al diffusion distance and holding time is lnd = 0.66lnt+0.24. Finally, the phase and mechanical properties of two groups of B4C/Al–Ti and B4C/Al composites were analyzed. The results showed that the impurity phase of sintering products of Ti doped samples was greatly reduced compared with that of the non doped group, and the mechanical properties were also significantly improved. Ti doping effectively regulates the interfacial reaction of B4C/Al composites, inhibits the formation of impurity brittle phase in the system, and optimizes the mechanical properties of the composites. 相似文献
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碳酸铈是生产CeO2的重要前驱体,对其性质具有决定性影响。碳酸铈的结晶特征取决于反应结晶过程中过饱和度的控制,其在NaCl-H2O体系中的相平衡数据是关键基础数据。本工作首先在298.15~363.15 K温度范围内合成了碳酸铈,XRD分析结果显示,323.15 K及以下得到的产品为八水碳酸铈[Ce2(CO3)3?8H2O],343.15 K及以上得到的产品为碱式碳酸铈[CeCO3OH]。本工作采用经典等温法测定了这两种碳酸铈化合物在NaCl-H2O体系中的相平衡数据,并利用Aspen Plus平台的ELEC-NRTL方程建立了可准确预测Ce2(CO3)3?8H2O和CeCO3OH在NaCl-H2O体系中相平衡数据的热力学模型。在无限稀释假设的基础上,通过回归Ce2(CO3)3?8H2O和CeCO3OH在水中的溶解度数据,确定了这两种化合物的溶度积。采用赋存形态分析方法,将CeCO3+, CeOH2+, CeHCO32+等组分引入热力学模型。利用实验数据获得了新的离子对(Ce3+-HCO3-和Ce3+-Cl-)参数,提高了新模型的预测能力,所建立的热力学模型预测值与实验数据吻合较好。 相似文献
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石蜡热性能的研究 总被引:2,自引:0,他引:2
以柴油作原料,反应温度分别在20℃、40℃、60℃下,通过尿素络合法恒温反应4 h制备石蜡,用气相色谱和差示扫描量热计(DSC)分析所制备的石蜡和市售25#、30#石蜡的正构烷烃组成和相变热并进行比较.通过比较发现,尿素络合石蜡含有多种正构烷烃,而25#、30#石蜡的组分少并集中在两种组分上,且25#、30#石蜡的相变热较高,更符合相变材料的要求.单体正构烷烃虽然满足储能要求,但其价格昂贵,因此可将烷烃组成较多的石蜡通过进一步分离使其正构烷烃组分数减少且集中在一两种组分上,来提高石蜡的相变热从而达到储能的要求.通过使用一种热力学模型预测石蜡的初始结晶点,和实验值对比证明模型能较好地预测石蜡的初始结晶点.因此可以通过调节石蜡的正构烷烃的组成及含量,使用该模型预测其初始结晶点而达到设计储能石蜡的目的. 相似文献
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含盐流动相损坏色谱柱原因探讨 总被引:1,自引:0,他引:1
用高压液相色谱(HPLC)分析某种原料药的实验过程中,采用KH2PO4缓冲液(pH值6.5)和甲醇组成的流动相进行梯度洗脱时,连续损坏两根新的色谱柱。经柱外梯度洗脱模拟实验发现了原因:流动相pH值随着有机相在流动相中体积百分数的上升而上升,最终超过色谱柱允许的pH值上限而造成色谱柱的损坏;同时,当有机相的比例超过80%时,有磷酸盐晶体析出,堵塞色谱柱,这也是损坏色谱柱的另一原因。 相似文献
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Phase stability diagrams of V–C–N and V–O–C–N systems were constructed as a function of carbon activity, nitrogen partial pressure, oxygen partial pressure, and solution formation characteristics to determine the conditions for the formation of V(C,N) via the carburization of vanadium or carbothermal reduction of V2O5 under nitrogen. The diagram showed that only V, V2C, and V(C,N) phases would be stable in the V–C–N system. From the diagram, it was also observed that only V(C,N) exists after the carburization of vanadium under nitrogen atmosphere more than 10?5 atm. The diagram of V–O–C–N system suggests that V2O5 can be reduced to V(C,N) without forming VO, owing to the high stability of the V(C,N) phase. Using these stability diagrams, the conditions for preparing V(C,N) from vanadium or V2O5 were deduced and the validity of the diagrams was verified using the experimental results. 相似文献
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含盐流动相损坏色谱柱原因分析 总被引:2,自引:0,他引:2
用高压液相色谱(HPLC)分析某种原料药,采用KH2PO4缓冲液(pH值6.5)和甲醇组成的流动相进行梯度洗脱时,连续损坏两根新的色谱柱。经柱外梯度洗脱模拟实验发现:流动相pH值随着有机相比例的上升而上升,最终超过色谱柱允许的pH值上限而使色谱柱损坏;同时,当有机相的比例超过80%(体积比)时,有磷酸盐晶体析出,发生堵塞,从而加重了色谱柱的损坏。所以,在梯度洗脱时,应该做柱外模拟试验,确定有机相最高比例,以保护色谱柱。 相似文献