Leaching of a low grade hematitic laterite ore using fungi and biologically produced acid metabolites

Tzeferis, PG

dc.contributor.author	Tzeferis, PG	en
dc.date.accessioned	2014-03-01T01:09:58Z
dc.date.available	2014-03-01T01:09:58Z
dc.date.issued	1994	en
dc.identifier.issn	0301-7516	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11264
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0028728302&partnerID=40&md5=902b04ce99012da1c87368f88329fc15	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Mineralogy	en
dc.subject.classification	Mining & Mineral Processing	en
dc.subject.other	Carboxylic acids	en
dc.subject.other	Cobalt	en
dc.subject.other	Fungi	en
dc.subject.other	Glucose	en
dc.subject.other	High temperature applications	en
dc.subject.other	Metabolites	en
dc.subject.other	Minerals	en
dc.subject.other	Nickel	en
dc.subject.other	Sugar (sucrose)	en
dc.subject.other	Aspergillus species	en
dc.subject.other	Bioleaching	en
dc.subject.other	Citric acids	en
dc.subject.other	Hematitic laterite ore	en
dc.subject.other	Microbial screening	en
dc.subject.other	Penicillium species	en
dc.subject.other	Leaching	en
dc.title	Leaching of a low grade hematitic laterite ore using fungi and biologically produced acid metabolites	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	Heterotrophic microbial leaching of Greek nickeliferous laterites was investigated. A variety of microbial screening, adaptation and leaching techniques were used to determine microorganisms, media and optimum conditions for nickel and cobalt recoveries. Two bioleaching techniques were developed: (a) leaching in the presence of microorganisms and (b) chemical leaching at high temperature (95-degrees-C) with a solution consisted of the metabolic products obtained from the cultivation of fungus strains at 30-degrees-C in glucose and sucrose carbohydrate media. It was found that up to 55-60% of the nickel was extracted using the first technique (a) with fungi strains P2 (Penicillium sp.) and A3 (Aspergillus sp.) in almost 50 days. Losses of soluble nickel in the fungal biomass were found to be 3.5% and 10.8%, respectively. The cobalt recovery achieved was around 50%. Nickel recoveries obtained by the second technique (b) were in the range of 70-72%. Effectiveness of strains used was found to depend on their ability to produce hydroxycarboxylic acids, especially citric acid, and also other metabolites. Possibilities for future investigations are discussed.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	International Journal of Mineral Processing	en
dc.identifier.isi	ISI:A1994QA91200009	en
dc.identifier.volume	42	en
dc.identifier.issue	3-4	en
dc.identifier.spage	267	en
dc.identifier.epage	283	en