By Z. Sadowski (auth.), Dr. G. P. Gallios, Prof. K. A. Matis (eds.)
Mineral processing applied sciences were used for many years to guard the surroundings and lots of examples of such functions are given the following. The ebook covers 4 significant topic parts: basics; environmental toxins and its prevention; separation techniques; and leading edge innovations.
Audience: Scientists, engineers and technologists accomplishing either utilized and easy learn into the various environmental points of mineral processing.
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Extra resources for Mineral Processing and the Environment
Example text
It was shown that ageing results in iron release from the sulphide lattice with the subsequent formation of a ferric hydroxide film on the pyrite surface. The ageing effect may be simulated by the addition of ferric ions in the pulp solution. In the case of arsenopyrite, however, iron was incorporated onto the surface, probably as ferric arsenate compounds. 28 An investigation of the effective removal by sorption of arsenic anions, existing in both main valency states (III or V), from dilute aqueous solutions by the addition of pyrite fine particles was reported [15]; pyrite was considered as an industrial by-product or solid waste and was examined as possible cheap adsorbent of arsenic oxyanions.
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All the species grow well under mixotrophic conditions with various minerals, in the presence of yeast extract, some sugars, amino acids or more complex organic substrates. They are strict aerobes and extreme acidophiles. Their optimum temperatures for growth lie between 37-42°C for S. thermosulfidooxidans subsp. thermotolerans, to 50°C for the other two species; with maximum temperatures which allow growth of 58-60°C for all three species. Bacteria of this genus are widespread in nature. They occur in dumps of sulphide ores and in volcanic regions.