Alaine Imbelloni - Academia.edu (original) (raw)

Papers by Alaine Imbelloni

Metallurgical and Materials Transactions B, 2016

Nickel ore dispersion before flotation using different reagents was investigated on a bench scale... more Nickel ore dispersion before flotation using different reagents was investigated on a bench scale to improve metallurgical recovery and selectivity. The nickel ore had a content of 0.8 pct nickel and 14.5 pct MgO. A positive linear correlation between MgO and Ni was found. Carboxy methyl cellulose, both pure and combined with Na2CO3, was the best dispersant used. The most efficient collector was potassium amyl xanthate combined with mercaptobenzothiazole, and the addition of xanthate was decisive for this good result because it is normally more stable in the pH range used in the tests. A pH change from 7 to 9 resulted in a metal recovery increase of 49.3 pct, together with an increase of 6.25 pct of MgO in the concentrate.

Rem: Revista Escola de Minas, 2014

This study describes the application of an empirical method to estimate the energy consumption in... more This study describes the application of an empirical method to estimate the energy consumption in laboratory of the primary grinding of nickel ore with a specific mineralogical texture. This method developed by Donda was previously used in iron ore from the Iron Quadrangle (Minas Gerais, Brasil) with the same purpose. Through the grinding test, performed under standard conditions and based on the degree of liberation and percentage retained on 0.074 mm, it is possible to obtain the energy consumption for grinding. The results mean a validation of the method with a good approximation between industrial and laboratory values. In practice the energy consumption is 26.6 kWh/t and through Donda's method, when using the liberation degree as a parameter, the energy found was 26.8 kWh/t.

Tecnologia em Metalurgia Materiais e Mineração, 2013

Este trabalho tem como objetivo avaliar o desempenho da flotação reversa de minério de ferro, usa... more Este trabalho tem como objetivo avaliar o desempenho da flotação reversa de minério de ferro, usando coletor (amina), na presença e na ausência de extensor de cadeia (óleo diesel) e emulsificante (lauril sulfato de sódio). Foram realizados seis ensaios de flotação com duplicata. Os ensaios utilizando amina, óleo diesel e lauril sulfato de sódio são os que mostram um melhor resultando, apresentando recuperação metálica de 91,82% e sílica no concentrado igual a 1,68%. Assim, comprova-se que o uso do extensor de cadeia e emulsificante, em conjunto com a amina, evidencia um melhor resultado na flotação, em termos de recuperação metálica e seletividade, comparativamente ao uso de apenas amina, ou amina com óleo diesel.

Metallurgical and Materials Transactions B, 2016

Nickel ore dispersion before flotation using different reagents was investigated on a bench scale... more Nickel ore dispersion before flotation using different reagents was investigated on a bench scale to improve metallurgical recovery and selectivity. The nickel ore had a content of 0.8 pct nickel and 14.5 pct MgO. A positive linear correlation between MgO and Ni was found. Carboxy methyl cellulose, both pure and combined with Na2CO3, was the best dispersant used. The most efficient collector was potassium amyl xanthate combined with mercaptobenzothiazole, and the addition of xanthate was decisive for this good result because it is normally more stable in the pH range used in the tests. A pH change from 7 to 9 resulted in a metal recovery increase of 49.3 pct, together with an increase of 6.25 pct of MgO in the concentrate.

Rem: Revista Escola de Minas, 2014

This study describes the application of an empirical method to estimate the energy consumption in... more This study describes the application of an empirical method to estimate the energy consumption in laboratory of the primary grinding of nickel ore with a specific mineralogical texture. This method developed by Donda was previously used in iron ore from the Iron Quadrangle (Minas Gerais, Brasil) with the same purpose. Through the grinding test, performed under standard conditions and based on the degree of liberation and percentage retained on 0.074 mm, it is possible to obtain the energy consumption for grinding. The results mean a validation of the method with a good approximation between industrial and laboratory values. In practice the energy consumption is 26.6 kWh/t and through Donda's method, when using the liberation degree as a parameter, the energy found was 26.8 kWh/t.

Tecnologia em Metalurgia Materiais e Mineração, 2013

Este trabalho tem como objetivo avaliar o desempenho da flotação reversa de minério de ferro, usa... more Este trabalho tem como objetivo avaliar o desempenho da flotação reversa de minério de ferro, usando coletor (amina), na presença e na ausência de extensor de cadeia (óleo diesel) e emulsificante (lauril sulfato de sódio). Foram realizados seis ensaios de flotação com duplicata. Os ensaios utilizando amina, óleo diesel e lauril sulfato de sódio são os que mostram um melhor resultando, apresentando recuperação metálica de 91,82% e sílica no concentrado igual a 1,68%. Assim, comprova-se que o uso do extensor de cadeia e emulsificante, em conjunto com a amina, evidencia um melhor resultado na flotação, em termos de recuperação metálica e seletividade, comparativamente ao uso de apenas amina, ou amina com óleo diesel.