BIOMINING RAWLINGS PDF

Biomining-A useful approach toward metal extraction Abstract: Biomining is the extraction of specific metals from their ores through .. Rawlings, D.E., Biomining [Douglas E. Rawlings, D. Barrie Johnson] on *FREE* shipping on qualifying offers. Biomining uses microorganisms to recover metals, . Editorial Reviews. From the Back Cover. Biomining is the biotechnology that uses Biomining – Kindle edition by Douglas E. Rawlings, D. Barrie Johnson.

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Influence of impeller type on mass transfer in fermentation vessels.

The ores obtained from mining are crushed and piled up to 10 meters high atop plastic irrigation pads, whereupon water seeded with acid, called the lixiviant, is irrigated through the heaps and collected Fig. Oxygen transfer limitation of bio-oxidation at high solids concentration. The biofilm also helps to retain the bacterial cultures in heaps during irrigation Sand and Gehrke The book describes several industrial bioleaching and biooxidation processes as well as the underlying theory and biology of the microbes involved.

The raffinate from the SE section is recycled to the heap or dump and the biommining liquor of the EW section is recycled to the SE operation Montealegre et al.

The use of reactors in biomining processes | Acevedo | Electronic Journal of Biotechnology

Dispatched from the UK in 3 business days When will my order arrive? The bioleaching process can be represented by a stoichiometric equation Acevedo, ; Acevedo and Gentina, In the case of a leaching organism such as Thiobacillus ferrooxidans growing in a simple defined culture media with ferrous iron as the energy source, the following equation can be written: In the last few years a number of interesting papers have been published on agitation of slurries in bioreactors for the biooxidation of gold concentrates Fraser, ; Kubera and Oldshue, ; Fraser, ; Oolman, ; Dew, ; Howk et al.

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rawlinsg Some of the hydrofoil designs developed in the mid-eighties Lally, present convenient characteristics for their use in bioleaching reactors. Kananaskis, Canada, 18 th rd May.

Biomining : Theory, Microbes and Industrial Processes

This cycling of iron and sulfur maintains an biominkng favorable situation for the bacteria; any ferric iron or sulfuric acid produced tends to undergo reduction with mineral ores to be subsequently re-oxidized by At.

Biomining, the use of micro-organisms to recover precious and base metals from mineral ores and concentrates, has developed into a successful and expanding area of biotechnology. Present and future commercial applications of biohydrometallurgy. The leach liquor obtained after heap irrigation has a very low concentration of copper dissolved into it, around 0. In the biooxidation process, bacteria partially oxidize the sulfide coating covering the rawllings microparticles in ores and concentrates.

Comparison biominjng performance for continuous bio-oxidation of refractory gold ore flotation concentrates. Special attention is given to the influence of oxygen and carbon dioxide mass transfer, process stoichiometry, solids suspension and slurry homogeneity, and the use of bioreactors in gold mining.

Leaching is the solubilization of one or more components of a complex solid by contact with a liquid phase. A study done raslings the copper solubilizing activity of At. The required k L a’s for oxygen are of the same order of magnitude or less than those that have been obtained experimentally in bioreactors Acevedo et al.

Therapeutic Protein Production Fidel O. Inhibition of microbial growth and metabolism by excess turbulence.

Biotechnology comes of age. Effect of carbon dioxide concentration on the bioleaching of a pyrite-arsenopyrite ore concentrate. Comparison of bacterial reactors biomuning in the oxidation of sulphide concentrates.

Effects of ferrous iron, dissolved oxygen, and inert solidas concentrations on the growth of Thiobacillus ferrooxidans. Table 3 lists the most commonly used type of impellers.

Biomining – Google Books

Check out the top books of the year on our page Best Books of Microbial processes are gaining increasing interest in the mining industry. Suspending of solid particles in liquid by agitators. American Institute of Chemical Engineering Journal Product details Format Paperback pages Dimensions x x Shake flask to fermentor: Rather, it occurs through an abiotic reaction between the copper ores and the ferric ions and protons produced by the metabolic activities of the bacteria.

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Ferrous sulphate oxidation using Thiobacillus ferrooxidans: The use of reactors in biomining processes. This involves using harsh chemical reagents to pull the ore from the rock, and subsequent treatment to further isolate the metal and extract pure copper.

Parameters such as volumetric productivity and degree of extraction can be significantly increased Pinches et al. Bacterial leaching of copper is usually performed in heaps raalings ground ore or in dumps of waste or spent material.

Progress in Industrial Microbiology 8: An important consideration in selecting a suitable reactor refers to the autocatalytic nature of microbial growth. Heap Leaching of Gold-Bearing Deposits: Journal of Biotechnology Adequate attention should be paid to the complex nature of the reacting sludge, composed by an aqueous liquid, suspended and attached cells, suspended solids, and air bubbles Gormely and Brannion, Inglobal bio,ining consumption topped 21 billion tons Copper Development Associationand that kind of demand has led to the development of sophisticated mining techniques.

The effect of mixing impeller rawlinge and pumping direction on solids suspension homogeneity. Physical Chemistry of Bacterial Leaching.