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Flotation behavior and electronic simulations of rare earth minerals in the presence of dolomite supernatant using sodium oleate collector

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Journal of Rare Earths 2019年第1期37卷 101-112,M0005页

作者： E.R.L.Espiritu G.R.da Silva D.Azizi F.Larachi K.E.Waters Department of Mining and Materials Engineering McGill University Department of Chemical Engineering Université Laval

Common rare earth (RE) minerals, such as bastnasite and monazite, may be formed in deposits associated with carbonate gangue, such as calcite and dolomite. Sodium oleate is a widely used collector for the flotation of both RE and gangue minerals, which might, therefore, be an inefficient process due to the lack of selectivity of this collector. Since these minerals are also sparingly soluble in solution, they could release their constituent ions into the solution, which could affect the floatability of other minerals. In this study, the interactions of sodium oleate with bastn(a|¨)site and monazite in the presence of dissolved dolomite species have been investigated. Micro flotation tests were carried out to explore the effects of these dissolved species on the floatability of the RE minerals. Zeta potential measurements and XPS characterization were carried out to understand how the species affect the collector adsorption. To complement these characterizations, density functional theory (DFT) simulations were conducted to investigate the collector-mineral and collector-adsorbed species (on the mineral surface) interactions.The results show that collector-dolomite interaction energy is greater than that of collector-adsorbed species, but lower than collector-monazite interaction energy, explaining the decrease in the minerals’recovery upon exposure to the dissolved mineral species. It is also shown that oleate ions (OI^-) have the strongest interaction with the minerals compared to other oleate species such as acid soap (HOI_2^-) and oleate dimer (Ol_2^(2-)). The behavior (strength and selectivity) of sodium oleate towards RE minerals and dolomite, as compared to other RE mineral collectors (such as aromatic hydroxamate), is attributed mainly to the collector's and the minerals'structure. The long hydrocarbon chain of sodium oleate which imparts hydrophobic characteristic to the minerals, makes it stronger collector than benzohydroxamate.Moreover, sodium oleate (with linear structure), unlike the aromatic hydroxa

关键词： Rare earth minerals Bastnasite Monazite Dolomite Sodium oleate DFT simulation

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Adsorption effect mechanism of sodium oleate on feldspar and quartz

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中国有色金属学会会刊：英文版 1994年第3期4卷 53-56页

作者： Liu, Yachuan Gong, Huangao(Mineral Engineering Department, Northeasten University, Shenyang 110006)Tian, Xilin Zhang, Keren(Institute of Multipurpose Utilization of Mineral Resources)

ＡＤＳＯＲＰＴＩＯＮＥＦＦＥＣＴＭＥＣＨＡＮＩＳＭＯＦＳＯＤＩＵＭＯＬＥＡＴＥＯＮＦＥＬＤＳＰＡＲＡＮＤＱＵＡＲＴＺＬｉｕ，Ｙａｃｈｕａｎ；Ｇｏｎｇ，Ｈｕａｎｇａｏ（ＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍ... 详细信息

ＡＤＳＯＲＰＴＩＯＮＥＦＦＥＣＴＭＥＣＨＡＮＩＳＭＯＦＳＯＤＩＵＭＯＬＥＡＴＥＯＮＦＥＬＤＳＰＡＲＡＮＤＱＵＡＲＴＺＬｉｕ，Ｙａｃｈｕａｎ；Ｇｏｎｇ，Ｈｕａｎｇａｏ（ＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ，ＮｏｒｔｈｅａｓｔｅｎＵｎ...

关键词： feldspar quartz sodium oleate adsorption XPS analysis

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Effect of Sodium oleate Concentration Variations on Froth Flotation of Manganese Ore

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International Journal of Nonferrous Metallurgy 2019年第3期8卷 25-33页

作者： Ogundeji Frncis Oladapo Alabi Oladunni Department of Metallurgical and Materials Engineering Federal University of Technology Akure Nigeria

Each type of a manganese deposit is a problem by itself in the matter of selection of a proper method of concentration, depending on the manganese minerals and their gangue constituents. Hence, this work studied the effect of sodium oleate concentration variation on the froth flotation of manganese ore obtained from Madaka, Niger State, Nigeria. The chemical analysis of the ore shows that it contains 48.4% MnO (37.5% Mn). Peaks were identified in XRD analysis of the crude sample as that of magnosite (MnO), hausmannite (Mn3O4), spessartine and vemuculite (Mg, Fe2+, Fe3+)3[(AlSiO4)O10](OH)2·4H2O. The ore was beneficiated by froth flotation using sodium oleate as collector at varied concentrations of 3 g/kg, 7 g/kg and 10 g/kg. Other chemical reagents used were sodium silicate, fuel oil and calcium hydroxide as dispersant, frother and pH modifier respectively. Results obtained showed percentage metal recoveries of 9.29%, 14.30% and 19.61%, assaying 65.20%, 62.03% and 61.30% Mn respectively. This indicates that at sodium oleate concentration of 3 g/kg, high grade-concentrate can be obtained.

关键词： Manganese Ore Sodium oleate Comminution Beneficiation Recovery

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Effectively enhancing recovery of fine spodumene via aggregation flotation

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Rare Metals 2020年第3期39卷 316-326页

作者： He-Peng Zhou Jie Hu Yong-Bing Zhang Yi-Jun Cao Xian-Ping Luo Xue-Kun Tang School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou221116China Faculty of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou341000China Chinese National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou221116China Henan Province Industrial Technology Research Institute of Resources and Materials Zhengzhou UniversityZhengzhou450001China Western Mining Co. Ltd.Xining810006China

The effects of shear strength on aggregation flotation processes for fine spodumene(particle size less than 19μm)were investigated in this study.Sodium oleate was used as a surfactant and collector.The shear strength was controlled by varying the agitation speed of a selfmade stirring apparatus.The aggregation process was studied by measuring the continuous transformations in the size distribution and shape of flocs.The results showed that as the shear strength increased,the distribution of fine spodumene transformed from bimodal to unimodal mode.The flocs tended to bridge more branches with a high shear strength and form globule-like flocs with very high strengths.The parameter"aggregation degree"was introduced to evaluate the aggregation process as a function of shear strength.The flotation rate of flocs formed with different shear strengths was also studied.These results demonstrated that the flotation rate was closely related to shear strength and that there was a close correlation between this and aggregation degree.These results could be used to guide the actual production of fine particles via shear aggregation flotation.

关键词： Shear strength Fine spodumene Flotation rate Shear aggregation Sodium oleate

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ADSORPTION AND ACTIVATION OF METAL IONS ON KYANITE

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中国有色金属学会会刊：英文版 1996年第3期6卷 22-24页

作者： Dong Hongjun Chen Jin(Department of Mineral Engineering,Central South University of Technology, Changsha 410083) Department of Mineral Engineering Central South University of Technology Changsha 410083 China

ＡＤＳＯＲＰＴＩＯＮＡＮＤＡＣＴＩＶＡＴＩＯＮＯＦＭＥＴＡＬＩＯＮＳＯＮＫＹＡＮＩＴＥ￥ＤｏｎｇＨｏｎｇｊｕｎ；ＣｈｅｎＪｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵ... 详细信息

ＡＤＳＯＲＰＴＩＯＮＡＮＤＡＣＴＩＶＡＴＩＯＮＯＦＭＥＴＡＬＩＯＮＳＯＮＫＹＡＮＩＴＥ￥ＤｏｎｇＨｏｎｇｊｕｎ；ＣｈｅｎＪｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏ...

关键词： metal ion kyanite sodium oleate adsorption flotation

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Effects of Nitrogen-Containing Biodegradation Enhancers on Sorption of n-Hexadecane in Soil-Water System

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China Petroleum Processing & Petrochemical Technology 2019年第1期21卷 110-116页

作者： Fan Xingyu Wu Jiang Chen Boshui Gu Kecheng Ding Jianhua Wu Ke Department of Petroleum Army Logistics University

Effects of nitrogen-containing biodegradation enhancers(methyl diethanolamine oleate(MDEAO) and oleic diethanolamide(ODEA)) on the adsorption of n-hexadecane in soil were studied by laboratory batch experiments. The partition coefficients(K_d values) of n-hexadecane sorption in soil-water system and those partition coefficients normalized to organic matter(K_(oc) values) were both determined. The adsorption isotherm curve of n-hexadecane in soil-water system was plotted. The measured results demonstrated that K_(oc) values changed in the soil-water system with different enhancers but are relatively invariant for the soil at the same site. The K_d values rose with the increase of the organic matter content in different soil. The average values of K_(oc) in the soil-water system with MDEAO, ODEA,and blank soil were 0.412, 0.252,and 0.309, respectively. The critical micelle concentration of ODEA and MDEAO was 0.7 mg/L and 1.9 mg/L, respectively,denoting that the solubilization capacity of ODEA was much stronger than MDEAO in the soil-water system. Consequently,the adsorption of MDEAO onto the solid surface increased the organic matter content in soil,which could make it more effective in enhancing the n-hexadecane adsorption. On the contrary, ODEA could inhibit the adsorption of n-hexadecane because of its less adsorption rate onto the soil particle surface and higher concentration in the soil-water system. According to the correlation coefficients, it was found that both the Henry linear and the Freundlich nonlinear isotherm sorption models were fitted to the data very well, however the Freundlich model was better than the Henry model.

关键词： methyl diethanolamine oleate oleic diethanolamide adsorption isothermal curve soil

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DRIFT SPECTROSCOPIC STUDY OF THE MECHANISM OF SELECTIVE SHEAR-FLOCCULATION OF HEMATITE FROM KAOLINITE

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Journal of Wuhan University of Technology(Materials Science) 1997年第Z1期12卷 83-93页

作者：龚文琪 Wuhan Univereity of Technology

The mechanism of separating hematite from kaolinite by shear-flocculation and the reason responsible for the selectivity of shear-flocculation was studied by using diffuse reflectance infrared Fourier transform (DRIFT) spec-troscopy, which was found to be effective for analysing adsorbed oleate species on the highly absorbing mineral hematite. The spectra suggest that chemisorption of oleate on hematite took place under shear-flocculation condition and that the chemisorbed species was bridged bidentate, corresponding to a peak at 1580 cm-1. Dimers of oleic acid, corresponding to a peak at 1710 cm-1, adsorbed via hydrocarbon chain association with the chemisorbed oleate. The coexistance of physically adsorbed oleic acid dimers and chemisorbed oleate ions made the surface of hematite hydrophobic, which would remain under the shear field. Under the same condition , the surface of kaolinite did not adsorb oleic acid or oleate and remained hydrophilic. The shear field of sufficient magnitude made the hydrophobic ultrafine particles of hematite to aggregate, whereas the hydrophilic ultrafine particles of kaolinite remained suspended in solution. This explains the mechanism of selective shear-flocculation of hematite from kaolinite.

关键词： DRIFT study, shear-flocculation chemisorption physical adsorption oleate hematite kaolinite

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Improving chemical and sensory quality of high-oleic peanut by application of foliar fertilizer

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Oil Crop Science 2021年第1期6卷 50-52页

作者： Chuantang Wang Feifei Wang Zhiwei Wang Ying Wei Ning Chen Zubo Du Yueyi Tang Lijun Wu Shandong Peanut Research Institute QingdaoChina Fengsheng Sci.&Tech.Co.Ltd.Fuxin 123000China Jinsheng Group Co.Ltd. Jvnan276600China Shandong Luhua Group Co.Ltd. Laiyang265200China

High-oleic peanut is favored by consumers because its a longer shelf life and benefits for cardiovascular health.Up to the high-oleic standard and with good taste is essential for peanut products in food processing.The aim of present study was to explore the effect of foliar fertilizers on chemical and eating quality of high-oleic peanuts.Three high-oleic peanut cultivars,namely Huayu 09C2,Huayu 9621,and Huayu 962,were used as materials.Huayu 09C2 and Huayu 9621 were planted in Fuxin,Liaoning,foliar sprayed with Fosforil at 2250 mL/ha,and Huayu 962 was sown in Jvnan,Shandong,foliar sprayed with Foliplus at 1500/3000 mL/ha.The chemical and sensory quality of peanut harvested from the treatment plots and controls was evaluated.Results showed that,Huayu 09C2 and Huayu 9621,foliar spraying with Fosforil in Fuxin,Huayu 962,foliar spraying with Foliplus in Jvnan,all still maintained high oleate content levels,and the Fosforil treatment was effective in raising the intensity of sweetness of roasted kernels.This study demonstrated the feasibility of improving chemical and sensory quality of high-oleic peanut through foliar fertilizer.

关键词： High-oleic Groundnut oleate Stability Eating quality Sucrose Sweetness Roasted peanut

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STUDY　ON　BONDING　MECHANISM　BETWEEN　SILLIMANITE　AND　COLLECTORS　BY　QUANTUM　CHEMISTRY　CALCULATION

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Journal of Central South University 1995年第2期7卷 66-70页

作者： Dong Hongjun Chen Jin(Department of Mineral Engineering, Central South University of Technology, Changsha, 410083, China) Department of Mineral Engineering Central South University of Technology Changsha China

The charge distribution of ions in sillimanite crystal, diatomic energy, and the heat of absorption of sillimanite on collectors such as sodium oleate,sodium dodecyl sulfonate, and tetradecyl amine are evaluated in th... 详细信息

关键词： sillimanite sodium oleate sodium dodecyl sulfonate tetradecyl amine flotation CNDO/2

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Emergency balloon-occluded retrograde transvenous obliteration of ruptured gastric varices

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World Journal of Gastroenterology 2013年第31期19卷 5125-5130页

作者： Tetsuo Sonomura Wataru Ono Morio Sato Shinya Sahara Kouhei Nakata Hiroki Sanda Nobuyuki Kawai Hiroki Minamiguchi Motoki Nakai Kazushi Kishi Department of Radiology Wakayama Medical University Wakayama 641-8510 Japan Department of Gastroenterology Kishiwada Tokushukai Hospital Kishiwada 596-8522 Japan Department of Radiology Kishiwada Tokushukai Hospital Kishiwada 596-8522 Japan

AIM: To evaluate the effectiveness and safety of emergency balloon-occluded retrograde transvenous obliteration(BRTO) for ruptured gastric varices.METHODS: Emergency BRTO was performed in 17 patients with gastric varices and gastrorenal or gastrocaval shunts within 24 h of hematemesis and/or tarry stool.The gastric varices were confirmed by endoscopy,and the gastrorenal or gastrocaval shunts were identified by contrast-enhanced computed tomography(CE-CT).A 6-Fr balloon catheter(Cobra type) was inserted into the gastrorenal shunt via the right internal jugular vein,or into the gastrocaval shunt via the right femoral vein,depending on the varices drainage route.The sclerosant,5% ethanolamine oleate iopamidol,was injected into the gastric varices through the catheter during balloon occlusion.In patients with incom plete thrombosis of the varices after the first BRTO,a second BRTO was performed the following day.Patients were followed up by endoscopy and CE-CT at 1 d,1 wk,and 1,3 and 6 mo after the procedure,and every 6 mo thereafter.RESULTS: Complete thrombosis of the gastric varices was not achieved with the first BRTO in 7/17 patients because of large gastric varices.These patients underwent a second BRTO on the next day,and additional sclerosant was injected through the catheter.Complete thrombosis which led to disappearance of the varices was achieved in 16/17 patients,while the remaining patient had incomplete thrombosis of the varices.None of the patients experienced rebleeding or recurrence of the gastric varices after a median follow-up of 1130 d(range 8-2739 d).No major complications occurred after the procedure.However,esophageal varices worsened in 5/17 patients after a mean follow-up of 8.6 mo.CONCLUSION: Emergency BRTO is an effective and safe treatment for ruptured gastric varices.

关键词： Emergency balloon-occluded retrograde transvenous obliteration Gastric varices Bleeding Portal hypertension Ethanolamine oleate

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