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Dissolution Kinetics of Spent Petroleum Catalyst using Two Different Acidophiles

IR@IMMT: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar


Field	Value

Title	Dissolution Kinetics of Spent Petroleum Catalyst using Two Different Acidophiles

Creator	Pradhan, D Mishra, D Kim, D J Choudhury, G R Lee, S W

Subject	Hydro and Electro Metallurgy

Description	Leaching studies using spent petroleum catalyst containing Ni, V and Mo were carried out using two different acidophiles, iron oxidizing (IOB) and sulfur oxidizing (SOB) bacteria. XRD analysis proved the existence of V in oxide form, Ni in sulfide form, Mo both in oxide and sulfide forms, and sulfur in elemental state. Both bacteria showed similar leaching kinetics at the same leaching parameters, such as pH, nutrient concentration, pulp density, particle size and temperature. The dissolution kinetics for Ni and V was much higher than Mo. Bioleaching kinetics was observed to follow dual rates, initially faster followed by a slower rate. So, dissolution mechanism was based on surface- and pore-diffusion rate. The dissolution process was found to follow 1st order kinetics. Unified dissolution rate kinetics equations were developed using 1st order rate kinetics. Various thermodynamic parameters were also calculated. Rate determining step for both the bacteria were evaluated and the average D1 (surface) and D2 (pore) values were found to be around 7 × 10− 9 and 1 × 10− 10 cm2 respectively. The lower value of D2 suggested that the pore diffusion is the rate determining step during bioleaching process.

Publisher	Elsevier

Date	2009

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://eprints.immt.res.in/28/1/pradhan.pdf Pradhan, D and Mishra, D and Kim, D J and Choudhury, G R and Lee, S W (2009) Dissolution Kinetics of Spent Petroleum Catalyst using Two Different Acidophiles. Hydrometallurgy .

Relation	http://dx.doi.org/10.1016/j.hydromet.2009.07.014 http://eprints.immt.res.in/28/