alexa Recovery Of Molybdates From An Alkaline Leachate Of Spent Hydrodesulphurisation Catalyst E Proposal Of A Nearly-closed Process | 21464
ISSN:2157-7463

Journal of Petroleum & Environmental Biotechnology
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2nd World Congress on Petrochemistry and Chemical Engineering

Helena M V M Soares and Isabel S S Pinto
Accepted Abstracts: J Pet Environ Biotechnol
DOI: 10.4172/2157-7463.S1.008
Abstract
In this work, we developed a simple, effective, low-cost and more environmentally friendly process (with low energy requirements and minimized effluent emissions) to recover molybdenum from an alkaline leaching solution of a spent hydrodesulphurisation catalyst, as a final product with high purity and in high yield. Alkaline leaching of spent NieMo hydrodesulphurisation catalysts results in a solution that mainly contains molybdenum and aluminum. Before recovering molybdenum, previous separation of aluminum from the solution, as a precipitate of aluminum hydroxide, was performed by lowering the pH to 8, at room temperature, with a yield of 99.2%. Recovery of molybdenum was studied by precipitation in the form of a salt of strontium or lead molybdate. The first process allowed a recovery of 96% of Mo at 25 0 C, as tetragonal SrMoO 4 , with high purity (99%). Precipitation with lead at 25 0 C resulted in a maximum recovery of 99.8% of the molybdenum, as tetragonal PbMoO 4 , with a purity of 99.5%. Finally, the destination of the final solution is discussed and a flow sheet considering the production of strontium/ lead molybdate is proposed.
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