By Douglas E. Rawlings, D. Barrie Johnson

ISBN-10: 354034909X

ISBN-13: 9783540349099

Biomining is the biotechnology that makes use of microorganisms to get better metals, specifically copper and gold, from ores and concentrates. Having built from an easy operational (in phrases of either engineering and biology) technique, biomining has constructed right into a multifaceted know-how, to the level that the various biggest business stirred tanks and lots in the course of the international are hired for bioprocessing minerals.

This ebook has a powerful utilized strategy and describes rising and verified commercial procedures, in addition to the underlying thought of the method, and the biology of the microorganisms concerned. Chapters were written by way of body of workers from best biomining businesses, experts and across the world famous researchers and academics.

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1 Capital Cost Breakdown The capital cost breakdown generated for a recent feasibility study of a potential BIOX™ project is used as an example. 5. The mechanical equipment supply cost is based on budget quotes obtained for all major equipment units and can be classified as a preliminary estimation with a target accuracy of −15 to +25%. The total capital cost estimate is an order of magnitude estimation and is based on cost data from previous cost studies. 7, respectively. The biooxidation section contributes to more than 50% of the total BIOX™ plant equipment cost, with the BIOX™ reactors and the BIOX™ agitator costs contributing the bulk of this cost.

Arsenopyrite) did not influence the optimal nutrient requirements of the bacterial population. After the screening, the most critical operating parameters in batch cultures were further investigated in more detail in continuous operations with agitated tank reactors at laboratory (80 L), pilot (4 m3) and semi-industrial (65 m3) scales (Morin et al. 1995; d’Hugues et al. 1997). It was found that the mineral oxidation rate was at least 30% faster in continuous mode than in batch conditions, showing the importance of running continuous bioleaching tests when the objective is to evaluate performances with a view to application at an industrial scale.

Sufficient power must be provided to the impeller to prevent flooding. 2. a, determined by the oxygen demand of the process. 3. The impeller pumping rate must be sufficient to achieve uniform solids suspension and to maintain uniform temperature, pH and concentration profiles through the reactor. Flooding of an impeller occurs when the air passes through the impeller and is not dispersed by the fluid flow. This is accompanied by a decrease in the agitator power draw, the oxygen transfer rate achieved and a reduction in the solids suspension capability of the impeller.

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Biomining by Douglas E. Rawlings, D. Barrie Johnson

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