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"USE OF MEMBRANE EMULSION SPAN 80 AND TOPO IN URANIUM EXTRACTION AND STRIPPING. Membrane emulsion span 80 and TOPO used in uranium extraction and stripping has been done. The extraction was carried outby emulsion membrane H3PO4 in TOPO-Kerosene. The feed or external aqueous phase was uranium in HNO3. The emulgator span-80 was used to obtain a stable emulsion membrane system. The influence factors were percentage of TOPO-Kerosene, time extraction, molarity of external aqueous phase and molarity of internal aqueous. After the emulsion membrane was formed, the extractionand stripping process was performed. The ratio volume feed : volume membrane phase equal to 1 : 1 and volume of 5 % TOPO-Kerosene : Volume 3 M H3PO4 equal 1 : 1 were used. The relative good yield were obtained at concentration of TOPO in Kerosene and 3 M H3PO4 was 5 %, molarity of internal aqueous phase equal to 1 M, molarity of external aqueous phase 3 M H3PO4 and time extraction equalto 10 minutes with the speed of emulsification was 8000 rpm. At this condition the extraction efficiency of uranium obtained was 97.8 %, the stripping efficiency 52.56 %, and the total efficiency was 53.80 %.PENGGUNAAN MEMBRAN EMULSI SPAN 80 DAN TOPO UNTUK EKSTRASI DAN STRIPPING URANIUM. Telah dilakukan penelitian membran emulsi span 80 dan TOPO yang digunakan untuk ekstraksi uranium. Extraksi dengan membran emulsi H3PO4 dalam TOPO-Kerosen. Larutan umpan untuk fasa air eksternal adalah uranium dalam asam nitrat. Untuk memperoleh sistem emulsi yang stabil dipakai emulgator Span 80. Parameter yang berpengaruh adalah persen TOPO-Kerosene, molaritas fasa air internal H3PO4, molaritas fasa air eksternal HNO3 dan waktu ekstraksi. Setelah diperoleh membran emulsi, kemudian dilakukan proses ekstraksi dan stripping, dengan rasio volume umpan : volume membran sebesar 1 : 1; volume 5% TOPO-Kerose : volume 3M H3PO4 sebesar 1 : 1. Hasil relatif lebih baik diperoleh pada konsen-trasi TOPO Kerosene: volume 3 M H3PO4 adalah 5 %, molaritas larutan fasa internal sebesar 1 M, molaritas larutan fasa eksternal adalah 3 M H3PO4 dan waktu ekstraksi sebesar 10 menit dengan kecepatan emulsi 8000 rpm. Pada kondisi ini diperoleh effisiensi ekstraksi uranium 97,8 %, efisiensi stripping 52,56 % dan efisiensi total adalah 53,8 %."

"In Mentawa areas there are indications that the U mineralization associated with tourmaline, quartz, sulfide minerals that fill the fracture aperture, on the rocks metasilt, and filit with the direction of WNW-ESE, the thickness milimetric-centrimetic with radioactivity 500-15000 c/s SPP 2 NF. The purpose of this study is to know the characters, parageneses and the process of formation of uranium minerals. The method used by microscopic observation of several examples of thin sections and polished sections of the previous research results. The study shows that uranium minerals are uraninite, associated with molybdenite, magnetite, rutile, ilmenite, pyrite, pyrrhotite, tourmaline, garnet, quartz and mineral pikblende associated with arsenopyrite, covelite, hematite, chalcopyrite, pyrite, pyrrhotite, tourmaline, quartz fill in cracks in rocks biotite and biotite schist. Mineral associations indicate that the process of formation of uranium mineralization occurs in three phases: pegmatik pneumatolitik, and hydrothermal alteration."

"The influence of U3 O8 and U3 Si2 powder diffrence toward the formation of porosity, uranium homogeneity and cladding thickness of U3 O8 -Al and U3 Si2 - Al fuel plate product. Research of raw material influence of U3 O8 and U3 Si2 in the making of U3 O8 - Al and U3 Si2 - Al fuel plate has been conducted. The U3 O8 represent result of the amonium uranil carbonate calcination process, while U3 Si2 powder result by milling ingot U3 Si2 (U - 7,5 w%)...."

"ABSTRAKMetode pemisahan antara pelarut dengan bitumen yang saat ini digunakan dalam industri aspal dari aspal alam menimbulkan banyak permasalahan sehingga perlu dikembangkan metode pemisahan yang lebih ramah lingkungan dan menggunakan konsumsi energi yang rendah yaitu dengan menggunakan membran. Penelitian ini memisahkan kerosin dengan bitumen pada ekstraksi aspal alam menggunakan membran hollow fiber polipropilen. Tujuan penelitian ini adalah mendapatkan kerosin dengan konsentrasi bitumen paling kecil sehingga kerosin dapat digunakan kembali sebagai pelarut. Penelitian ini dilakukan dengan 3 variasi, yaitu pressure drop, laju alir larutan dan volume pelarut. Perbedaan konsentrasi awal dengan konsentrasi bitumen di permeat yang terbesar yaitu sebesar 0,01197 gr/mL didapatkan pada rasio volume pelarut per berat bitumen yang paling kecil yaitu 60 mL/gr, sedangkan konsentrasi bitumen di permeat terkecil sebesar 0,0046 gr/mL didapatkan pada laju alir yang paling besar yaitu 300 mL/menit serta sebesar 0,0034 gr/mL pada pressure drop yang paling kecil yaitu 3 mmHg. Persamaan yang menyatakan hubungan volume pelarut dengan konsentrasi bitumen di permeat adalah , hubungan antara laju alir dengan konsentrasi bitumen di permeat adalah , hubungan antara pressure drop dengan konsentrasi bitumen di permeat adalah dengan Y adalah konsentrasi bitumen di permeat, X1 adalah volume pelarut, X2 adalah laju alir, dan X3 adalah pressure drop.

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ABSTRACTMethod of separation between solvent with bitumen that is currently used in asphalt industry of natural asphalt raises many issues so more environmentally friendly separation method and uses low energy consumption need to be developed by using membrane. This study separates kerosene with bitumen on extraction of natural asphalt using polypropylene hollow fiber membranes. The purpose of this study is to get kerosene with a small concentration of bitumen so that kerosene can be reused as a solvent. This study was conducted with three variations, namely the pressure drop, flow rate and volume of the solvent. The largest differences of initial concentration and the bitumen concentration in permeate is equal to 0.01197 g/mL that obtained on the smallest solvent volume ratio by weight of bitumen of 60 mL/g, while the smallest bitumen concentration in permeate at 0.0046 g/mL was found in the greatest flow rate of 300 mL/min and at 0.0034 g/mL was found in the smallest pressure drop of 3 mmHg. The equation that expresses the relation of solvent volume ratio with bitumen concentration in the permeate is , the relation of flow rate with bitumen concentration in the permeate is , the relation of pressure drop with the bitumen in the permeate is with Y is bitumen concentration in permeate, X1 is the volume of solvent, X2 is the flow rate, and X3 is the pressure drop."