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Recovery of molybdenum from
spent
In the present study, a hydro-refining spent catalyst with an alumina base
has been taken into consideration. It is mostly used for the recovery of
molybdenum. The spent catalyst constitutes around 21 pct of molybdenum as
molybdenum oxide. The study has revealed that at temperature lower than
600oC, it is possible to recover an appreciable quantity of molybdenum from
the spent catalyst. The statistical experiments have been designed for the
study to optimize the process parameters during soda ash roasting, i.e.
roasting temperature, reaction time and percentage soda ash addition. In the
trial run, it has been found to extract about 81% of molybdenum with
temperature 500oC, soda ash 20wt% when roasted for 20 minutes.
The process has further been optimized and it has been possible to recover
about 94% of Mo as its oxide, from the spent hydro-refining catalyst, under
the optimum condition of reaction temperature 575oC with 10wt.
pct. soda ash addition and 45 minutes roasting time. |
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