Assessment and Characterization of REE Minerals from an Alkali-Carbonatitic Complex

Antoniassi, Juliana Lívi; Uliana, Daniel; Kahn, Henrique; Tassinari, Maria Manuela Maia Lé; Ulsen, Carina

doi:10.1007/978-3-319-13948-7_18

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“…Dependendo da composição mineralógica do material, algumas substâncias (reagentes) podem ser introduzidas ao sistema para adsorver à superfície de determinadas espécies e torná-las hidrofóbicas ou hidrófilicas (afinidade pela fase líquida), atuando como reagentes seletivos (coletores ou depressores) e viabilizando sua separação (LUZ et al, 2010). As principais características mineralógicas levantadas nesses estudos estão sumariadas a seguir (WEDOW JUNIOR, 1967;MARIANO, 1989;LAPIDO-LOUREIRO, 1994;MORTEANI;PREINFALK, 1996;VIERA;LINS, 1997;NEUMANN, 1999;TASSINARI et al, 2001;MORAIS et al, 2001;NEUMANN;VALARELLI, 2001;TASSINARI, 2001;TOLEDO et al, 2004;KAHN et al, 2012;ANTONIASSI et al, 2015;NEUMANN;MEDEIROS, 2015;TESTA et al, 2017 Tabela 3 -Descrição das amostras estudadas.…”

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Caracterização tecnológica de recursos minerais de terras raras em complexos alcalinos e alcalino-carbonatíticos do Brasil.

Antoniassi¹

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This work focused on the acquisition of chemical and mineralogical detailed information in samples from Brazilian alkaline and alkaline-carbonatitic deposits containing rare earths, in order to provide subsidies for process development. These deposits present high volumes of resources, low contents of rare earth elements (essentially light rare earths) and high mineralogical complexity. The studied samples are lateritic materials, with a total content of rare earth oxides between 1.27 and 6.45%, being monazite the main rare earth bearing mineral, except in one of the samples, where bastnaesite is predominant; cerianite, xenotime and a scandium-phosphate occur as trace. Rare earth minerals tend to enrich toward the finest sieve fractions with an medium grain size of 15 μm in the fractions greater than 0.008 mm and decreasing below 0.1 μm in finer fractions. These minerals occur preferentially in intimate associations with the gangue; liberation greater than 60% (in area) are observed under 0.020 mm fractions. The concentration potential of these minerals was evaluated through physical separation and hydrometallurgical extraction. Physical separations (heavy liquid and magnetic) did not succeed in obtaining products enriched in rare earths. The most promising result were the possibility of removing magnetic phases above 0.020 mm (responsible for 30%, on average, of the total Fe2O3 contained in the samples) without significant losses of rare earths. The rare earths acid leaching protocols and conditions were established by statistical experimental design. For samples comminuted below 0.30 mm, the best rare earths solubilization (77%) and with minimum gangue leaching was obtained in concentrate sulfuric acid, low solids concentration, environmental temperature and four hours of reaction. Higher levels of rare earths solubilization can be achieved, however accompanied by higher gangue solubilization.

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“…-fosfato mostrando finos veios enriquecidos em uma fase portadora de ETR (a; imagens de BSE ao MEV), mas abaixo do limite de resolução da análise de imagen por MLA (b; imagem classificada). Espectro de EDS mostrando a composição química da partícula em (c).Fonte:(ANTONIASSI et al, 2015).…”

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Caracterização tecnológica de recursos minerais de terras raras em complexos alcalinos e alcalino-carbonatíticos do Brasil.

Antoniassi¹

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Assessment and Characterization of REE Minerals from an Alkali-Carbonatitic Complex

Cited by 1 publication

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Caracterização tecnológica de recursos minerais de terras raras em complexos alcalinos e alcalino-carbonatíticos do Brasil.

Caracterização tecnológica de recursos minerais de terras raras em complexos alcalinos e alcalino-carbonatíticos do Brasil.

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