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Cleaner production of ammonium paratungstate by membrane electrolysis-precipitation of sodium tungstate solution

Tungsten 2023年第1期5卷 145-159页

作者： afolabi uthmon olayiwola Hao Du Shao-Na Wang Biao Liu Ye-Qing Lv Bo Pan University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The production of ammonium paratungstate(APT) is riddled with the generation of wastewater,which causes environmental problems.To solve the problem of wastewater generation at source,a membrane electrolysis-NH3·H2O precipitation method,which prevents wastewater generation and recycles the reagents used in the process,was proposed and investigated in this study.The electrolysis process was investigated based on parameters such as initial cathodic and anodic NaOH concentrations,and current density.The results showed that an increase in current density and initial cathodic NaOH concentration and a decrease in the initial anodic NaOH concentration would enhance the separation of tungsten and sodium.The optimum condition was found at a current density of 666 A·m^(-2),initial anodic and cathodic NaOH concentrations of 69 g·L^(-1) and 40 g·L^(-1),with a current efficiency of 75.40%,and energy consumption for producing 1 ton of NaOH was 2184 kW·h.The precipitation process was investigated based on the acidic high W/Na molar ratio solution obtained by the electrolysis process with NH3·H2O as the precipitant.Parameters such as excessive coefficient,temperature,and W/Na molar ratio were studied.The result showed that the variation of excessive coefficient and solution temperature had an opposite effect on the purity of the APT,while an increase in the W/Na molar ratio would increase the product purity.The precipitation product obtained had a purity of 99.6% and was characterized using X-ray diffraction,inductively coupled plasma,and scanning electron microscopy.The methods proposed in this study could provide fundamental information for the design of a cleaner APT production process.

关键词： Membrane electrolysis Ammonium paratungstate Separation of sodium and tungsten ions Ion states of tungsten Cleaner production

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Recent advances in the recovery of transition metals from spent hydrodesulfurization catalysts

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Tungsten 2021年第3期3卷 305-328页

作者： Jian-Zhang Wang Hao Du afolabi olayiwola Biao Liu Feng Gao Mei-Li Jia Ming-Hua Wang Ming-Lei Gao Xin-Dong Wang Shao-Na Wang School of Metallurgy Northeastern UniversityShenyang 110819China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Chengde V and Ti New Material Co. Ltd.HBIS Group Co.Ltd.Shijiazhuang 050023China

Hydrodesulfurization(HDS)catalysts are widely used in petrochemical industries,playing a crucial role in desulfurization process to get high-quality oil.The generation of Al-based spent HDS catalyst is estimated to be 1.2×105 tons per year around the world.The spent HDS catalysts have been regarded as an important secondary resource due to their abundant output,considerable metal value,and regeneration potential;however,if improperly handled,it would severely pollute the environment due to high content of heavy metals.Thus,the recovery of valuable metals from spent HDS catalysts is of great importance from both resource utilization and environmental protection points of view.In this work,recent advances in the spent HDS catalyst treatment technologies have been reviewed,focusing on the recovery of valuable transition metals and environmental impacts.Finally,typical commercial processes have been discussed,providing in-depth information for peer researchers to facilitate their future research work in designing more effective and environmentally friendly recycling processes.

关键词： Spent hydrodesulfurization catalyst Recycling Hydrometallurgical and pyrometallurgical processes Valuable metals

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The Horizontal Loop Electromagnetic(HLEM)Response of Ifewara Transcurrent Fault,Southwestern Nigeria:A Computational Results

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Journal of Geological Research 2021年第3期3卷 3-13页

作者： A.A.Adepelumi O.B.olayiwola D.E.Falebita O.afolabi B.O Soyinka J.Obokoh Department of Geology Obafemi Awolowo UniversityIle-IfeNigeria Nigerian Defence Academy KadunaNigeria Terracon SeattleWashington DCUSA Sam Houston State University SpringTexasUSA

The need to accurately interpret geological models that approximate mineralized zones in a Basement Complex terrain necessitate the development of horizon loop electromagnetic method(HLEM)forward modeling solutions for such scenarios.The focus of the present work is on finding rapid forward modeling solutions for synthetic HLEM data as an aid in exploration for moderate to deep conductive mineral exploration targets.The main thrust is obtaining idealized HLEM models that are required for geological interpretation of the subsurface in such environment.The original HLEM equations developed by Wesley were extended to represent a horizontally stratified earth with a conductive approximated by shear zone.From these equations a computer program was written to calculate the HLEM responses for optimal conductor model with known values of coil separations(L),depth of burial(z)and angle of dip of the target.The thin conductive model was used because it is simple and suitable for different geological scenarios.The accuracy of the approximate forward solution has been confirmed for HLEM systems with various geometric ranges,frequencies and conductivities.Three models having varying overburden thickness,dip angle of target and source-receiver separation were used in the forward modeling.The effect of varying the dip angle,overburden thickness and coil separation was studied in all the three models used.The result obtained from the forward modeling showed that variation of the dip angle gave rise to changes in the amplitudes of the anomalies generated,while that of overburden and coil separation gave rise to changes in anomaly shape.Also,the geometry and position of the causative body were precisely delineated.

关键词： Mineralized Conductor Overburden HLEM Modeling Basement complex

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Bilirubin Lowering Potential of Aqueous Carica Papaya Extract in Induced Jaundice in Rats

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Journal of Pharmacy and Pharmacology 2017年第7期5卷 457-466页

作者： M. I. Ayeni M. A. Akanmu O. O. Bolaji S. A. Osasan G. olayiwola1, M. O. afolabi1, A. M. Morohunfola Department of Clinical Pharmacy and Pharm Admin ObafemiAwolowo University Ile-Ife 220282 Nigeria Department of Pharmacology ObafemiAwolowo University Ile-Ife 220282 Nigeria Department of Pharmaceutical Chemistry ObafemiAwolowo University Ile-Ife 220282 Nigeria Department of Pathology Ondo State Hospitals Management Board Akure 340Nigeria Tots & Tykes Pediatrics 3750 S University Dr Ste 200 Fort Worth Arlington TX 76006 USA

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