Abstract
This paper presents the study results of Mn2+ ion influence on reverse cationic flotation of iron ore at pH 10.5. A small influence was observed on all response variables evaluated: mass recovery, Fe metallurgical recovery, grade of Fe and SiO2 in obtained concentrates for dosages of MnCl2 from 600 g/ton. The conditioning of pulp with ethylene diamine tetraacetic acid - EDTA complexing agent (720 g/ton) in presence of MnCl2 (600 g/ton) at natural pH, before the addition and conditioning with corn starch (400 g/ton) and amine (50 g/ton) at pH 10.5, produced a concentrate with 63% Fe, 5.1% SiO2, which is similar to results obtained in flotation test without manganese species present in pulp.
Highlights
The Brazilian iron ore reserves correspond to 13.6% of the total world reserves
The Brazilian production was of 386.3 Mt with an average content of 63.6% Fe split into pebble ore (10.7 %) and fine products (89.3 %)
About 70 % of Brazilian production comes from Minas Gerais State (60 Mt in 2012) (DNPM, 2014)
Summary
The Brazilian iron ore reserves correspond to 13.6% of the total world reserves. The world production of iron ore in 2013 was estimated at 3 billion tons (similar to the previous year). About 70 % of Brazilian production comes from Minas Gerais State (60 Mt in 2012) (DNPM, 2014) It is a common practice in Iron Quadrangle – Minas Gerais State to concentrate the fraction fines of iron ore by gravimetric, magnetic separation and flotation methods. The method choice to concentrate a specific iron ore depends on several factors such as its physical and mineralogical properties, and the liberation fraction size of quartz (Araujo et al, 2003; Filippov et al, 2014). The particles in fraction size smaller than 4 μm hamper the selectivity of this process route. To solve this problem a previous deslaming operation is used, which causes metal loss (Houot, 1983; Ma et al, 2011; Filippov et al, 2014)
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