Biomining by Pieter C. van Aswegen, Jan van Niekerk, Waldemar Olivier

By Pieter C. van Aswegen, Jan van Niekerk, Waldemar Olivier (auth.), Douglas E. Rawlings, D. Barrie Johnson (eds.)

Biomining is the biotechnology that makes use of microorganisms to get well metals, particularly copper and gold, from ores and concentrates. Having built from an easy operational (in phrases of either engineering and biology) procedure, biomining has constructed right into a multifaceted know-how, to the level that some of the greatest commercial stirred tanks and tons through the global are hired for bioprocessing minerals.

This ebook has a powerful utilized technique and describes rising and tested business strategies, in addition to the underlying conception of the method, and the biology of the microorganisms concerned. Chapters were written by way of team of workers from prime biomining businesses, experts and the world over famous researchers and academics.

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Reagents that may typically show toxic effects toward the BIOX™ culture include: ● ● ● ● ● Cyanide and thiocyanate (at very low concentrations) Grease and oil Detergents, solvents and degreasing components Biocide descaling reagents and other water-treatment reagents Certain flocculants, flotation reagents and nutrients All new reagents to be used on the plant, including flotation reagents, nutrients and flocculants, must undergo toxicity testing prior to implementation. 4. 00 Na 500 Ca 250 Cl 5,000 Total dissolved solids 2,100 18 Pieter C.

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. The power input for the design of the agitator is normally determined by either the oxygen mass transfer rate required or the aeration rate, to prevent flooding of the impeller.

The impeller circulates the slurry in a downward motion with the objective of increasing the gas retention time in the reactor. Alternative agitation systems are being developed in an effort to reduce the overall power input required for aeration and air dispersion. One of the options under investigation is the use of an up-pumping axial-flow impeller in biooxidation reactors. The reactor is designed with a height-to-diameter ratio of 1:1 and is equipped with two or three A340 impellers. The top impeller is situated just below the surface of the reactor.

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