Cleaner production of soapstone in the Ouro Preto region of Brazil : a case study.

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dc.contributor.authorRodrigues, Michael Leonardo Marques
dc.contributor.authorLima, Rosa Malena Fernandes
dc.date.accessioned2015-04-24T18:21:26Z
dc.date.available2015-04-24T18:21:26Z
dc.date.issued2012
dc.description.abstractSoapstone is a metamorphic rock that is used for ornamental and construction purposes. Rock recovery during the exploitation process is low. Quarries in the state of Minas Gerais in Brazil sell small and lowquality blocks to artisans, who produce pans and souvenirs. This activity constitutes the main economic activity in several places within the Ouro Preto region, such as Santa Rita. Soapstone artisan workshops produce a large quantity of powder (approximately 10e15% rock recovery), which is discarded carelessly, often causing environmental problems. The objective of this study was to characterise and purify soapstone powder from the workshop of an artisan who works exclusively with rocks from Bandeiras-Santa Rita de Ouro Preto in order to identify potential applications for the residues and purified products. First, the mineralogical composition was determined by X-ray diffractometry, the size distribution was determined by sieving and the chemical composition of the residue was determined by inductively coupled plasmaeoptical emission spectroscopy (ICP-OES). Next, purification tests were performed by magnetic separation for fraction sizes larger than 74 mm. Fraction sizes smaller than 74 mm were purified by flotation and leaching with hydrochloric acid. This research shows that it is possible to recover almost all residues of both small and large size distributions for use as insecticide filler. In addition, it is possible to recover 100% and 96% of fraction sizes larger and smaller than 74 mm, respectively, for use in the paper industry (wallpaper and packaging). For more valuable applications, it is necessary to leach the purified material from flotation using hydrochloric acid. In addition to decreasing the environmental impact of soapstone powder discharge, it is possible for soapstone artisans to sell this powder for a profit, whether it is purified or not.pt_BR
dc.identifier.citationRODRIGUES, M. L. M.; LIMA, R. M. F. Cleaner production of soapstone in the Ouro Preto region of Brazil: a case study. Journal of Cleaner Production, v. 32, p. 149-156, 2012. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0959652612001758>. Acesso em: 06 mar. 2015.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.jclepro.2012.03.028
dc.identifier.issn0959-6526
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/5159
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico Journal of Cleaner Production concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3585901062707.pt_BR
dc.subjectSoapstone residuespt_BR
dc.subjectTalcpt_BR
dc.subjectIndustrial mineralpt_BR
dc.subjectResidue characterisationpt_BR
dc.subjectResidue recoverypt_BR
dc.titleCleaner production of soapstone in the Ouro Preto region of Brazil : a case study.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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