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Патент US Chemical/biological process to oxidize multimetallic

Gibbons report mediation

Thiooxidans, T. ferrooxidans, and. At present the only other known commercial application of biological leaching is at the Denison Mine in the Elliot Lake area of Ontario, Canada, where the bacterium T. ferrooxidans is used to. As a result of such laboratory work, Duncan et al., in U.S. Pat. No. 3,607,235,describe a biological leaching process for sulphide minerals. The metal sulphide, in finely ground form, is suspended in. CROSS -REFERENCE TO RELATED APPLICATIONS This application is a divisional of earlier application Ser. No. 07/071,968 filed July 10, 1987, now U.S. Pat. No. 4,888,293. This application relates to an improved method. Additionally, many sulphide ores and concentrates are sufficiently high in sulphide content that the biologically produced sulphuric acid lowers the pH below 1.2, effectively stopping the biological leaching process. U.S. Pat. Since ferric iron is an oxidant which assists in the oxidation of mineral sulphides and since the solubility of ferric iron increases with decreasing pH, the organism's pH sensitivity prevents its use.

“The extraction of metals from sulphide minerals through the mediation of the bacterium Thiobacillus ferrooxidans has been known for many years. It appears that as much as one quarter of the copper.”
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to arsenic <i>mediation</i> concentrations <u>report</u> <i>report</i> as <i>report</i> high <strong>report</strong> <em>mediation</em> as <i>gibbons</i> 4,000 <em>report</em> mg/l. While <i>gibbons</i> leaching arsenopyrite with <em>gibbons</em> <i>gibbons</i> Thiobacillus. In a solution <i>mediation</i> of pH 1.7, ferrooxidans, during <em>report</em> <i>gibbons</i> the Sixth <i>gibbons</i> International Symposium on Biohydrometallurgy (1985 <i>mediation</i> Karavaiko (12)) <i>mediation</i> <strong>mediation</strong> reported that, 990

Norris also reports that there are some indications that Leptospirillum can oxidize pyrite as well as does Thiobacillus ferrooxidans. At present, no one has been able to develop an economically viable biological.

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Gibbons report mediation
Although biological leaching methods have been developed for the oxidation of sulphide minerals in low grade waste ores, a process taking place naturally, the kinetics of such processes are so slow that.
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