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Study on Extraction of Tea Saponin from Camellia oleifera Cake Using Water as Extraction Solvent 被引量:7
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作者 马力 陈永忠 +5 位作者 彭邵锋 王湘南 陈隆升 王瑞 杨小胡 罗健 《Agricultural Science & Technology》 CAS 2015年第5期1078-1080,共3页
This paper studied the effects of liquid-solid ratio, temperature, time and pH value on the extraction rate of tea saponin from the cake of Camellia oleifera seeds by using single factor experiment with the cake of Ca... This paper studied the effects of liquid-solid ratio, temperature, time and pH value on the extraction rate of tea saponin from the cake of Camellia oleifera seeds by using single factor experiment with the cake of Camellia oleifera seeds as the raw materials, and water as the extraction solvent, and orthogonal test was used to determine the optimal extraction process conditions. The results showed that the extraction ratio of tea saponin could reach up to 95.50% when the liquidsolid ratio was 11:1, extracting temperature of 80 ℃, extraction time of 6 h, and pH value of 9. 展开更多
关键词 Camellia oleifera cake Tea saponin Extraction solvent
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Precursor solution prepared by evaporation deamination complex method for solvent separation of Mo and W by H_2O_2-complexation 被引量:7
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作者 关文娟 张贵清 高从堦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期1139-1146,共8页
An novel method on preparation of precursor solution for solvent separation of molybdenum (Mo) and tungsten (W) by hydrogen peroxide (H2O2)-complexation from the ammonium tungstate solution containing high Mo wa... An novel method on preparation of precursor solution for solvent separation of molybdenum (Mo) and tungsten (W) by hydrogen peroxide (H2O2)-complexation from the ammonium tungstate solution containing high Mo was studied. The precursor solution was obtained via evaporation deamination and H202-complex transformation processes. Then it was extracted with a mixture extractant of tri-alkyl phosphine oxide (TRPO) and tributyl phosphate (TBP) to separate Mo and W. The results indicated that the evaporation deamination complex method reduced the acid consumption by more than 90% in comparison with the traditional directly acid regulation complex method. The transformation rates of W and Mo were higher than 95% and the decomposition rate of H202 was less than 15% at a 1.8-1.9 times H202 dosage, 45-50 ℃, initial pH of 1.80-1.90, and transformation volume ratio of 100% for 60 min in the H2O2-complexation transformation process. The minimum extraction rate of W was 2%, the maximum extraction rate of Mo was 82.6% and the highest separation coefficient was 76.7 in a single-stage extraction. 展开更多
关键词 TUNGSTEN MOLYBDENUM solvent extraction separation precursor solution H202
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Removal of chromium(Ⅲ) from aqueous waste solution by predispersed solvent extraction 被引量:1
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作者 罗建洪 李军 +1 位作者 杨兆鹏 刘雪峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第2期524-529,共6页
The extraction experiments of chromium(W) from aqueous waste solution by predispersed solvent extraction (PDSE) process with extractant (HEHPEHE) and its mixture, including acidic extractant (D2EHPA), alkaline... The extraction experiments of chromium(W) from aqueous waste solution by predispersed solvent extraction (PDSE) process with extractant (HEHPEHE) and its mixture, including acidic extractant (D2EHPA), alkaline extractant (TOA) and neutral extractant (TBP) were carried out respectively. It is found that the extractant HEHPEHE exhibited high extraction selectivity to chromium(III) from aqueous waste solution. The colloidal liquid aphrons (CLAs) were successfully generated using kerosene as a solvent, HEHPEHE as an extractant, sodium dodecyl benzene sulphate (SDBS) as a surfactant in aqueous phase and polyoxyethylene sorbitol anhydride monolaurate (Tween-20) in oil phase. To study the extraction efficiency and advantages of the PDSE process in the removal of chromium(III), the effects of major factors, such as initial chromium(III) concentration, volume of colloidal gas aphrons (CGAs), HEHPEHE volume fraction, phase ratio (solvent phase to water phase), mass fraction of dodecyl trimethylammonium bromide (HTAB), mass fraction of SDBS, mass fraction of Tween-20 and initial pH of aqueous waste solution were also investigated and the appropriate process conditions were obtained. Under the appropriate conditions, the extraction efficiency of chromium(III) above 99.9 % can be achieved and the treated aqueous waste solution can be discharged directly without polluting the environment. 展开更多
关键词 predispersed solvent extraction (PDSE) process chromium(III) extraction mechanism EXTRACTANT
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SCREENING FOR ANTIBACTERIAL AND ANTIFUNGAL ACTIVITIES IN SOME MARINE ALGAE FROM THE FUJIAN COAST OF CHINA WITH THREE DIFFERENT SOLVENTS 被引量:37
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作者 郑怡 陈寅山 卢海声 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2001年第4期327-331,共5页
Three different solvents viz ethanol, acetone and methanol toluene (3:1) were used to extract antibiotics from 23 species of marine algae belonging to the Chlorophyta, Phaeophyta and Rhodophyta. Their crude extracts w... Three different solvents viz ethanol, acetone and methanol toluene (3:1) were used to extract antibiotics from 23 species of marine algae belonging to the Chlorophyta, Phaeophyta and Rhodophyta. Their crude extracts were tested for antibacterial and antifungal activities. Among them, the ethanol extract showed the strongest activity against the bacteria and fungi tested. Four species of the Rhodophyta ( Laurencia okamurai, Dasya scoparia, Grateloupia filicina and plocamium telfairiae ) showed a wide spectrum of antibacterial activity. Every solvent extract from the four species was active against all the bacteria tested. The test bacterium Pseudomonas solancearum and the fungus Penicilium citrinum were most sensitive to the extracts of marine algae. In general, the extracts of seaweeds inhibited bacteria more strongly than fungi and species of the Rhodophyta showed the greatest activity against the bacteria and fungi tested. 展开更多
关键词 marine algae antibacterial activity antifungal activity solvent extracts
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Recovery of Copper(II) and Nickel(II) from Plating Wastewater by Solvent Extraction 被引量:17
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作者 李立清 钟宏 +1 位作者 曹占芳 袁露 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第6期926-930,共5页
The solvent extraction technology, was applied to recover Cu^2+ and Ni^2+ from plating wastewater.Lix984N was chosen as the extractant due to-its gooff extraction performance. The influence parame-ters were examlned... The solvent extraction technology, was applied to recover Cu^2+ and Ni^2+ from plating wastewater.Lix984N was chosen as the extractant due to-its gooff extraction performance. The influence parame-ters were examlned. The results show that the separation of Cu^2+ and Ni" from sulphate medium can be realized by adjusting pH value with the help of Lix984N. For extracting Cu^2+ and Ni^2+, the optimal pH values are 4 and 10.5, and the maximal extraction percentages are 92.9% and 93.0%, respectively .With recovered Cu^2+ and Ni^2+ stripped in 170g.L^ -1 and 200 g.L^-1 H2SO4 medium, the stripping percentages of Cu^2+ and Ni^2+ are 92.9% and 93.0%, respectively. This method is simple and can be used to recover Cu^2+ and Ni^2+ from plating wastewater. And a flow sheet for separation of Cu^2+ and Ni^2+ is presented. 展开更多
关键词 RECOVERY COPPER NICKEL solvent extraction plating wastewater
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Extracting vanadium from stone-coal by oxygen pressure acid leaching and solvent extraction 被引量:16
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作者 邓志敢 魏昶 +3 位作者 樊刚 李旻廷 李存兄 李兴彬 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第S1期118-122,共5页
Vanadium extraction from stone-coal was investigated by oxygen pressure acid leaching and solvent extraction.The mineralogy of the stone-coal from Tongren City of Guizhou Province,China,was investigated by various det... Vanadium extraction from stone-coal was investigated by oxygen pressure acid leaching and solvent extraction.The mineralogy of the stone-coal from Tongren City of Guizhou Province,China,was investigated by various determination methods. The effects of leaching time,leaching temperature,leaching agent concentration,leaching L/S ratio,granularity of material,additive consumption were investigated based on the mineralogy.The results show that under the conditions of leaching time of 3-4 h, temperature of 150℃,sulfuric acid consumption of 25%?30%,ratio of liquid to solid of 1.2:1,the granularity less than 0.074 mm, additive consumption of 3%-5%,and oxygen pressure of 1.2 MPa,and the vanadium leaching rate can be more than 92%by the method of two-step pressurized acid leaching.The powdery V2O5 product with 99.52%in V2O5 content is obtained by the flowsheet of acid recovery,removing iron by reduction process,solvent extraction,precipitating vanadium with ammonium water,and pyrolysis from the stone-coal oxygen pressure acid-leaching solution.The total recovery efficiency of vanadium is above 85%,which is more than 20%higher than that obtained in the conventional process.Furthermore,the new process does not cause air pollution since no HCl or Cl2 is released by calcination of the raw material. 展开更多
关键词 stone-coal extracting vanadium oxygen pressure acid leaching acid recovery solvent extraction
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Distribution and sources of solvent extractable organic compounds in PM_(2.5) during 2007 Chinese Spring Festival in Beijing 被引量:17
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作者 LI Xingru GUO Xueqing +3 位作者 LIU Xinran LIU Chenshu ZHANG Shanshan WANG Yuesi 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第2期142-149,共8页
The solvent extractable organic compounds (SEOC), including n-alkanes, polycylic aromatic hydrocarbons, fatty acids, and dicarboxylic acids in PM2.5 during the 2007 Chinese Spring Festival in Beijing, were measured ... The solvent extractable organic compounds (SEOC), including n-alkanes, polycylic aromatic hydrocarbons, fatty acids, and dicarboxylic acids in PM2.5 during the 2007 Chinese Spring Festival in Beijing, were measured via gas chromatography-mass spectrometry for determining the characteristics and sources of these organic pollutants. The concentrations of total n-alkanes, PAHs, and organic acids before Chinese Spring Festival Eve (1025.5, 95.9, and 543.3 ng/m3, respectively) were higher than those after (536.6, 58.9, and 331.8 ng/m3, respectively), n-Aalkanes and PAHs had much higher concentration in nighttime than those in daytime because of high relative humidity and low wind speed during the night. Combustion of coal and exhaust emission were major sources of n- alkanes. It could be concluded by the characteristic ratios that the primary source of PAHs in fine particles was the combustion of coal, but the combustion of gasoline was in the next place. The ratios of C18:0/C16 indicated the contribution of vehicular emissions to the fatty acids. Dicarboxylic and aromatic acids were abundant in daytime than in nighttime because these acids were secondary organic acid and the photochemical degradation of aromatic hydrocarbons was the main source. 展开更多
关键词 AEROSOL PM2.5 Chinese Spring Festival solvent extractable organic compounds
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Recovery of nickel,cobalt,copper and zinc in sulphate and chloride solutions using synergistic solvent extraction 被引量:10
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作者 chu yong cheng keith r.barnard +2 位作者 wensheng zhang zhaowu zhu yoko pranolo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第2期237-248,共12页
A number of synergistic solvent extraction (SSX) systems have been developed to recover nickel, cobalt, zinc and copper from sulphuric and chloride leach solutions by the solvent extraction team of CSIRO, Australia.... A number of synergistic solvent extraction (SSX) systems have been developed to recover nickel, cobalt, zinc and copper from sulphuric and chloride leach solutions by the solvent extraction team of CSIRO, Australia. These in- clude (1) Versatic 10/CLXS0 system for the separation of Ni from Ca in sulphate solutions, (2) Versatic 10/4PC system for the separation of Ni and Co from Mn/Mg/Ca in sulphate solutions, (3) Cyanex 471X/HRJ-4277 system for the separation of Zn from Cd in sulphate solutions, (4) Versatic 10/LIX63 system for the separation of Co from Mn/Mg/Ca in sulphate solutions, (5) Versatic 10/LIX63/TBP system for separation of Ni and Co from Mn/Mg/Ca in sulphate solutions, (6) Versatic 10/LIX63 system for the separation of cobalt from nickel in sulphate solutions by difference in kinetics, (7) Cyanex 272/LIX84 system for the separation of Cu/Fe/Zn from Ni/Co in sulphate solutions, (8) Versatic 10/LIX63fFBP system to recover Cu/Ni from strong chloride solutions, and [9) Versatic 10/LIX63 system to separate Cu from Fe in strong chloride solutions. The synergistic effect on metal separation and efficiency is presented and possible industrial applications are demonstrated. The chemical stability of selected SSX systems is also reported. 展开更多
关键词 Synergistic solvent extraction NICKEL COBALT COPPER ZINC
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Solvent extraction of vanadium from sulfuric acid solution 被引量:11
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作者 WANG Mingyu ZHANG Guiqing WANG Xuewen ZHANG Jialiang 《Rare Metals》 SCIE EI CAS CSCD 2009年第3期209-211,共3页
The behaviour of vanadium(V) extracted from sulfuric acid solution was investigated using Cyanex 923 as an extractant. The effects of the concentration of Cyanex 923 and the pH of the solution were studied. The extr... The behaviour of vanadium(V) extracted from sulfuric acid solution was investigated using Cyanex 923 as an extractant. The effects of the concentration of Cyanex 923 and the pH of the solution were studied. The extraction of vanadium(V) increases with the increase of Cyanex 923 concentration and shaking time. Cyanex 923 can extract vanadium(V) from sulfuric acid solution at low pH conditions, and the best pH conditions for extraction of vanadium(V) are at pH 1.0-2.0. The species extracted into the organic phase is VO2HSO4 with one molecule of Cyanex 923. Equilibrium studies were used to assess the extraction efficiency of vanadium(V) recovery from the sulfuric acid solution. 展开更多
关键词 solvent extraction vanadium(V) Cyanex 923 sulfuric acid solution
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Selective separation of Cu(Ⅱ),Zn(Ⅱ),and Cd(Ⅱ)by solvent extraction 被引量:11
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作者 XIE Keng WEN Jiankang +1 位作者 HUA Yixin RUAN Renman 《Rare Metals》 SCIE EI CAS CSCD 2008年第3期228-232,共5页
An experimental investigation was presented on the separation of Cu(Ⅱ), Zn(Ⅱ), and Cd(Ⅱ) from a rich sulfate leachate of zinc slag by solvent extraction. The results of orthogonal experiments indicate that LI... An experimental investigation was presented on the separation of Cu(Ⅱ), Zn(Ⅱ), and Cd(Ⅱ) from a rich sulfate leachate of zinc slag by solvent extraction. The results of orthogonal experiments indicate that LIX 984N is highly selective and very efficient in the extraction of Cu(Ⅱ), and the analysis of variance indicates that the sequence of parameters according to their influence on the separation efficiency is phase ratio 〉 LIX 984N concentration 〉 pH value 〉 extraction time. The optimal condition for copper extraction is obtained as 25% of LIX 984N concentration, 7 rain of extraction time, 3:2 of phase ratio O/A, and pH = 1.7. The separation of Zn(Ⅱ) and Cd(Ⅱ) was performed after the copper extraction from the raffinate. Comparative analysis of the separation with di-2-ethylhexyl phosphoric acid (D2EHPA), D2EHPA-tributyl- phosophate (TBP) synergistic extracting system, and 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester (HEHEHP) was made at pH = 2.0. It is demonstrated that the extraction efficiency with D2EHPA is improved after being saponified by sodium hydroxide, and D2EHPA-TBP synergistic extracting, as well as HEHEHP, has a superior selectivity to Zn(Ⅱ) over Cd(Ⅱ). 展开更多
关键词 solvent extraction selective separation copper(Ⅱ) zinc(Ⅱ) cadmium(Ⅱ) orthogonal experiment
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Extraction of Organochlorine Pesticides in Sediments Using Soxhlet,Ultrasonic and Accelerated Solvent Extraction Techniques 被引量:9
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作者 LANGYinhai CAOZhengmei NIEXinhua 《Journal of Ocean University of China》 SCIE CAS 2005年第2期173-176,共4页
The application of soxhlet, ultrasonic and accelerated solvent extractiontechniques to the analysis of six organochlorine pesticides (α-HCH, β-HCH, γ-HCH, o, p'-DDT,p,p'-DDT and p,p'-DDE) in Taihu Lake ... The application of soxhlet, ultrasonic and accelerated solvent extractiontechniques to the analysis of six organochlorine pesticides (α-HCH, β-HCH, γ-HCH, o, p'-DDT,p,p'-DDT and p,p'-DDE) in Taihu Lake sediment samples is described. It was found that the limits ofquantification ranged from 0.002 μg g^(-1) to 0.004 μg g^(-1), and the recoveries oforganochlorine pesticides with the three extraction techniques were acceptable ( 】80.7%). With amass selective detector, better results were obtained by accelerated solvent extraction usinghexane-acetone (1:1) as compared with soxhlet and ultrasonic extraction. It was shown that theaccelerated solvent extraction was the optimum technique for the analysis of organochlorinepesticides in sediments. The general features of the three extraction techniques are also presented. 展开更多
关键词 organochlorine pesticides Taihu Lake sediments soxhlet extraction ultrasonic extraction accelerated solvent extraction
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Process development for the direct solvent extraction of nickel and cobalt from nitrate solution:aluminum,cobalt,and nickel separation using Cyanex 272 被引量:7
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作者 Zela T.Ichlas Don C.lbana 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第1期37-46,共10页
A direct solvent extraction(DSX) process for purifying nickel and cobalt from the nitric acid leach solution of nickel laterite ores was conceived and experimentally probed. The proposed process consists of two solv... A direct solvent extraction(DSX) process for purifying nickel and cobalt from the nitric acid leach solution of nickel laterite ores was conceived and experimentally probed. The proposed process consists of two solvent extraction(SX) steps but with only one extractant - bis(2,4,4-trimethylpentyl)phosphinic acid(Cyanex? 272) - used in both steps. The first extraction step involved the removal of aluminum and zinc, whereas the second extraction step involved the separation of cobalt along with manganese from nickel. The experimental results showed essentially quantitative removal of aluminum(〉97%) and zinc(〉99%) in a single extraction stage using 20vol% Cyanex 272 at pH 2.1. Some cobalt(32%) and manganese(55%) were co-extracted but were easily scrubbed out completely from the loaded organic phase using dilute sulfuric acid at pH ≤ 1.38. Cobalt and manganese in the first extraction raffinate were extracted completely in four extraction stages at staggered pH values of 4.0, 4.4, 4.5, and 4.0 in the first, second, third, and fourth stages, respectively, using also 20vol% Cyanex 272. A small amount of nickel(up to 6.6%) was co-extracted but was easily scrubbed out completely with dilute sulfuric acid at pH 2.0. A flow diagram showing the input and output conditions and the metals separated under the deduced optimum conditions is presented. 展开更多
关键词 solvent extraction ALUMINUM COBALT NICKEL nickel laterite ores
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The use of environmentally sustainable bio-derived solvents in solvent extraction applications——A review 被引量:7
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作者 Zheng Li Kathryn H.Smith Geoffrey W.Stevens 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第2期215-220,共6页
Replacement of volatile organic compounds (VOCs) by greener or more environmentally sustainable solvents is becoming increasingly important due to the increasing health and environmental concerns as well as economic... Replacement of volatile organic compounds (VOCs) by greener or more environmentally sustainable solvents is becoming increasingly important due to the increasing health and environmental concerns as well as economic pressures associated with VOCs. Solvents that are derived from biomass, namely bio-derived solvents, are a type of green solvent that have attracted intensive investigations in recent years because of their advantages over con- ventional VOCs, such as low toxicity, biodegradability and renewability. This review aims to summarize the use of bio-derived solvents in solvent extraction applications, with special emphasis given to utilization of biodiesels and terpenes. Compared with the conventional VOCs, the overall performance of these bio-derived solvents is comparable in terms of extraction yields and selectivity for natural product extraction and no difference was found for metal extraction. To date most researchers have focused on laboratory scale thermodynamics studies. Future work is required to develop and test new bio-derived solvents and understand the kinetic performance as well as solvent extraction nilnt nlant studies. 展开更多
关键词 solvent extraction Bio-derived solvents Green solvents BIODIESELS TERPENES
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Copper solvent extraction from alkaline cyanide solution with guanidine extractant LIX 7950 被引量:6
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作者 F.XIE D.B.DREISINGER 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第6期1136-1140,共5页
The use of the guanidine extractant LIX 7950 extracting copper and cyanide from alkaline cyanide solution was investigated.The extraction of copper and cyanide under different initial copper and extractant concentrati... The use of the guanidine extractant LIX 7950 extracting copper and cyanide from alkaline cyanide solution was investigated.The extraction of copper and cyanide under different initial copper and extractant concentrations was examined and the stoichiometric extraction constant of Cu(CN)32- with LIX 7950 was calculated.Both the distribution coefficient and the stoichiometric extraction constant of Cu(CN)3 2-with LIX 7950 decrease when the temperature is varied from 25℃to 45℃, indicating the extraction process is exothermic.The calculated enthalpy change of the reaction(-HΘ)is about-190 kJ/mol.The copper extraction isotherms under different molar ratios of cyanide to copper are established.The preferential extraction of Cu(CN)32- over Cu(CN)4 3-and CN -has been confirmed and a high cyanide-to-copper molar ratio tends to suppress copper loading. The loaded copper and cyanide can be stripped efficiently by the moderately strong NaOH solutions(0.5-1.0 mol/L)and the presence of NaCN in the stripping solution facilitates copper stripping. 展开更多
关键词 COPPER CYANIDE solvent extraction GUANIDINE
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Separation of middle rare earths by solvent extraction using 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester as an extractant 被引量:7
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作者 Danilo Fontana Loris Pietrelli 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第5期830-833,共4页
The extraction of the trivalent middle rare earths from chloride media by kerosene solutions of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester as an extractant was studied. The separation factors between the elem... The extraction of the trivalent middle rare earths from chloride media by kerosene solutions of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester as an extractant was studied. The separation factors between the elements using solution simulating wastes from NiMH spent batteries have been evaluated: the order of the extractive ability of extractant can be confirmed in Tb>Gd>Eu>Sm. 展开更多
关键词 solvent extraction rare earths SEPARATION
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Phase separation in solvent extraction of cobalt from acidic sulfate solution using synergistic mixture containing dinonylnaphthalene sulfonic acid and 2-ethylhexyl 4-pyridinecarboxylate ester 被引量:6
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作者 Ting HUANG Yong-xi WANG +3 位作者 Hui-ping HU Fang HU Yu-qing LUO Shi-jun LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第5期1107-1116,共10页
Phase separation rate is a critical character in determining the usefulness of a solvent extraction system in hydrometallurgy. A survey of the synergistic mixture containing dinonylnaphthalene sulfonic acid (HDNNS) an... Phase separation rate is a critical character in determining the usefulness of a solvent extraction system in hydrometallurgy. A survey of the synergistic mixture containing dinonylnaphthalene sulfonic acid (HDNNS) and 2-ethylhexly 4-pyridinecarboxylate ester (4PC) for the extraction of cobalt from acidic single metal sulfate solution was carried out to suggest how the physicochemical properties and the morphology of the reverse micelles in the loaded organic phase affect the phase separation. The results show that effective parameters affecting the phase separation are the viscosity and the excess water uptake of the loaded organic phase. It is obvious that the specific settling rate (SSR) decreases with the apparent increase of these two parameters. The measurement of small angle X-ray scattering (SAXS) proves that the morphology of the reversed micelles in the loaded organic phase changes evidently with the change of the specific settling rate (SSR). 展开更多
关键词 synergistic solvent extraction phase separation specific settling rate reverse micelle COBALT
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Separation and purification of tantalum from plumbomicrolite of amazonite deposit in Kola Peninsula by acid leaching and solvent extraction 被引量:5
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作者 S M MASLOBOEVA L G ARUTYUNYAN +1 位作者 M N PALATNIKOV D V MANUKOVSKAYA 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第1期72-88,共17页
A plumbomicrolite concentrate(PMC)was leached with the mixture of HF and H2SO4,HF and HNO3 acids,respectively.Optimal conditions ensuring high recovery of tantalum and niobium(up to 99%)into solution,and radionuclides... A plumbomicrolite concentrate(PMC)was leached with the mixture of HF and H2SO4,HF and HNO3 acids,respectively.Optimal conditions ensuring high recovery of tantalum and niobium(up to 99%)into solution,and radionuclides into insoluble residue were determined.Fluoride-sulfuric acid and fluoride-nitric acid schemes were proposed for PMC leaching by an extractive separation of tantalum form niobium,lead and impurities,and production of high-purity tantalum compounds.Octanol-1 was used as an extractant.Optimal conditions for production of high-purity tantalum strip solutions were defined for all stages(extraction-scrubbing-stripping).Produced tantalum compounds,such as tantalum pentoxide and potassium heptafluotanthalate,comply with the norms for high-purity substances in terms of impurities content.Final choice of the PMC processing scheme is determined by its profitability. 展开更多
关键词 mineral plumbomicrolite TANTALUM NIOBIUM acid leaching RADIOACTIVITY solvent extraction
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Influences of solid particles on the formation of the third phase crud during solvent extraction 被引量:6
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作者 ZHENG Qi RUAN Renman WEN Jiankang SONG Yongsheng DONG Qinghai WU Minglin YAO Guocheng 《Rare Metals》 SCIE EI CAS CSCD 2007年第1期89-96,共8页
The influences of solid particles in leach solution on the formation of the third phase crud during solvent extraction of copper were studied. Analyzed from the point of view of pH value and surface tension, the study... The influences of solid particles in leach solution on the formation of the third phase crud during solvent extraction of copper were studied. Analyzed from the point of view of pH value and surface tension, the study results showed that the solid particle is one of the most important contributors for the formation of the third phase crud. During solvent extraction, if the pH value was greater than 2.30, the number of solid particles in the mother solution increased, in which case the possibility of forming the third phase crud could also increase, and the interface tension value might grow in pace with the quantity of the third phase crud. 展开更多
关键词 solvent extraction solid particle the third phase crud surface tension
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Solvent extraction of copper and zinc from bioleaching solutions with LIX984 and D2EHPA 被引量:6
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作者 蓝卓越 胡岳华 +1 位作者 柳建设 王军 《Journal of Central South University of Technology》 2005年第1期45-49,共5页
The solvent extraction of copper and zinc from the bioleaching solutions of low-grade sulfide ores with LIX984 and D2EHPA was investigated. The influences of extractant content, aqueous pH value, phase ratio and (equi... The solvent extraction of copper and zinc from the bioleaching solutions of low-grade sulfide ores with LIX984 and D2EHPA was investigated. The influences of extractant content, aqueous pH value, phase ratio and (equilibration) time on metals extraction were studied. The results show that LIX984 has a higher selectivity for copper than for iron, zinc and other metals, and has the copper extraction rate above 97%, while the zinc and iron extraction rate is less than 1.6% respectively. Zinc extraction is carried out following the copper extraction from the raffinate. The zinc extraction with di(2-ethylhexyl) phosphoric acid(D2EHPA) is low due to its poor cation exchange. A sodium salt of D2EHPA is used and the zinc extraction rate is enhanced to above 98%. Though iron (Ⅲ) is strongly extracted before the extraction of zinc by D2EHPA, it is difficult to strip iron from the organic phase by sulfuric acid. The zinc stripping rate is above 99% with 100g/L sulfuric acid, while that of iron is 0.16%. Hence, the separation of zinc from iron can be achieved by the selective stripping. 展开更多
关键词 solvent extraction BIOLEACHING COPPER ZINC LIX984 D2EHPA
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Separation of nickel, cobalt and copper by solvent extraction with P204 被引量:4
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作者 钱东 王开毅 +3 位作者 潘春跃 唐有根 蔡春林 蒋金枝 《中国有色金属学会会刊:英文版》 CSCD 2001年第5期803-805,共3页
Nickel, cobalt and copper were separated by solvent extraction with P204. The experimental results show that [Co(NH 3) 6] 3+ is an inert complex in extraction kinetics, therefore cobalt can be separated from nickel an... Nickel, cobalt and copper were separated by solvent extraction with P204. The experimental results show that [Co(NH 3) 6] 3+ is an inert complex in extraction kinetics, therefore cobalt can be separated from nickel and copper by non equilibrium solvent extraction. Under the conditions of temperature 25?℃, contact time of two phases 10?min, phase ratio 1∶1, aqueous pH 10.10 and concentration of P204 20%, [Co(NH 3) 6] 3+ is hardly extracted by P204, while the percentage extractions of nickel and copper are 79.3% and 93.9% respectively. Nickel and copper are separated by equilibrium solvent extraction with P204. Under the conditions of temperature 25?℃, contact time of two phases 1?min, phase ratio 1∶1, equilibrium pH 4.01 and concentration of P204 20%, the separation factor of copper and nickel is 216. 展开更多
关键词 non equilibrium solvent extraction equilibrium solvent extraction NICKEL COBALT COPPER di(2 ethylhexyl) phosphate
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