KINETIKA DAN MEKANISME TRANSPOR PADA REAKSI REDUKSI U3O8 DENGAN GAS H2
| Main Authors: | , ARIYANI KUSUMA DEWI, , Prof. Ir. Wahyudi Budi Sediawan, S.U., Ph.D. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2014
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/128542/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=68891 |
Daftar Isi:
- U3O8 reduction using H2 gas is an important step in the manufacture of High Temperature Reactor ( HTR ) nuclear fuel core. Preliminary studies in the reduction of U3O8 emphasized on the optimum conditions determination. This research aims to study the transport mechanism and reaction rate, to formulate mathematical models and to determine the process parameters of U3O8 reduction. U3O8 reduction performed in a high temperature furnace (Opale furnace) with H2 gas as reducing agent with the gas pressure was kept constantly 50 mmHg . From previous studies found that the optimum conditions of U3O8 reduction process at temperature range of 750-800 °C for 3-4 hours . It was used as basis of determining the research variables . Research variables that used in this study were temperatures: 700 °C, 800°C, 900 °C, and times: 10 minutes, 20 minutes, 1 hour, 2 hours, 3 hours, 4 hours. U3O8 kernels sample were weighed before and after the reduction process to determine the weight loss and the conversion of reaction . Measurement of O/U ratio performed on the reduction results sample to determine whether the reduction reaction has been occurred . This study showed that the reduction reaction rate could be approximated by the first order reaction to H2 gas and the volume reaction model for U3O8 reactants consumption, with changing particle size. From the simulation of mathematical models, it was known that diffusion regime controled the overall reaction, with the value of surface reaction rate constants () and effective diffusivity in the initial solid () were affected by temperature with equations: = 422.843 (� , ), and = 1.9810exp (� , ).