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Study on the Recycling of Nuclear Graphite after Micro-Oxidation
Juan Liu,Chen Wang,Limin Dong,Tongxiang Liang 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.1
In this paper, a feasible strategy for the recycling of nuclear graphite is reported, based onthe formation mechanism and the removal of carbon-14 by micro-oxidation. We investigatedwhether ground micro-oxidation graphite could be used as a filler to make newrecycled graphite and which graphite/pitch coke ratio will give the recycled graphiteoutstanding properties (e.g., apparent density, flexural strength, compressive strength,and tensile strength). According to the existing properties of nuclear graphite, the ratio ofgraphite to pitch coke should not exceed 3. The recycled reactor graphite has been provensuperior in density, strength, and thermal conductivity. The micro-oxidation processenhances the strength of the recycled graphite because there are more pores andunsmooth surfaces on the oxidized graphite particles, which is beneficial for the access ofthe pitch binder and leads to efficient joint adhesion among the graphite particles.
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Study on the Recycling of Nuclear Graphite after Micro-Oxidation
Liu, Juan,Wang, Chen,Dong, Limin,Liang, Tongxiang Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.1
In this paper, a feasible strategy for the recycling of nuclear graphite is reported, based on the formation mechanism and the removal of carbon-14 by micro-oxidation. We investigated whether ground micro-oxidation graphite could be used as a filler to make new recycled graphite and which graphite/pitch coke ratio will give the recycled graphite outstanding properties (e.g., apparent density, flexural strength, compressive strength, and tensile strength). According to the existing properties of nuclear graphite, the ratio of graphite to pitch coke should not exceed 3. The recycled reactor graphite has been proven superior in density, strength, and thermal conductivity. The micro-oxidation process enhances the strength of the recycled graphite because there are more pores and unsmooth surfaces on the oxidized graphite particles, which is beneficial for the access of the pitch binder and leads to efficient joint adhesion among the graphite particles.
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