Continuous bacterial leaching of a low-grade manganese dioxide ore

Zafiratos, JG; Agatzini-Leonardou, S

dc.contributor.author	Zafiratos, JG	en
dc.contributor.author	Agatzini-Leonardou, S	en
dc.date.accessioned	2014-03-01T02:48:30Z
dc.date.available	2014-03-01T02:48:30Z
dc.date.issued	1997	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33872
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031339676&partnerID=40&md5=967c487daad2389e13e003ac14d2aab3	en
dc.subject.other	Bacteria	en
dc.subject.other	Dissolution	en
dc.subject.other	Extractive metallurgy	en
dc.subject.other	Grain size and shape	en
dc.subject.other	Iron	en
dc.subject.other	Leaching	en
dc.subject.other	Metal recovery	en
dc.subject.other	pH	en
dc.subject.other	Sulfur	en
dc.subject.other	Continuous bacterial leaching	en
dc.subject.other	Dilution	en
dc.subject.other	Ferric ion concentration	en
dc.subject.other	Leach solution pH	en
dc.subject.other	Manganese dioxide ore	en
dc.subject.other	Manganese ore treatment	en
dc.title	Continuous bacterial leaching of a low-grade manganese dioxide ore	en
heal.type	conferenceItem	en
heal.publicationDate	1997	en
heal.abstract	The leaching of a Greek low-grade manganese dioxide ore, not amenable to conventional mineral processing operations, was studied using a mixed culture of Thiobacillus sp. bacteria. The experiments were carried out in specially designed continuously aerated and stirred tank reactors arranged in two-tank series. The first tank of each series was loaded with an elemental sulfur culture suspension while the second was loaded with a manganese ore high density slurry. The bacterial culture had been previously adapted to grow on elemental sulfur and also in the presence of manganese ore and dissolved manganous ion. A two level full factorial design was constructed in order to study the effects of the ferric ion concentration in the leach solution, the 'elemental sulfur weight to ore weight' ratio, the ore pulp density and the composition of the dispersed gas. The responses which were investigated included percentage manganese recovery, co-dissolution of iron and manganese dissolution rate. Parameters with constant values throughout the experiments were the leach solution pH, the nutrient medium composition, the dilution rate and the ore and sulfur grain sizes. It was found that the ferric ion concentration was the most significant factor and had a positive effect on the final percentage extraction of manganese from the ore and also on the rate of manganese solubilization from the ore. The effects of the other factors studied are discussed in detail.	en
heal.publisher	Minerals, Metals & Materials Soc (TMS), Warrendale, PA, United States	en
heal.journalName	TMS Annual Meeting	en
dc.identifier.spage	535	en
dc.identifier.epage	551	en