Influence of Mn2+ ion in reverse cationic flotation of iron ore

Abstract

This paper presents the study results of Mn 2+ 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 SiO 2 in obtained concentrates for dosages of MnCl 2 from 600 g/ton. The conditioning of pulp with ethylene diamine tetraacetic acid -EDTA complexing agent (720 g/ton) in presence of MnCl 2 (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% SiO 2 , which is similar to results obtained in flotation test without manganese species present in pulp.keywords: Iron ore; reverse cationic flotation, Mn 2+ ion, EDTA.

Effect of EDTA on quartz and hematite flotation with starch/amine in an aqueous solution containing Mn2+ ions

“…The addition of corn starch after conditioning the minerals with EDTA (500 mg/L (135 mg/g) for quartz and 600 mg/L (162 mg/g) for hematite) results in high quartz recovery (90%) and very low hematite recovery because of the higher affinity of starch for hematite than for quartz. Based on these results, it is possible to restore the selectivity between quartz and hematite by reverse cationic flotation in an aqueous solution containing Mn 2+ after complexing it with EDTA, which is in accordance with the results of bench flotation tests of Cruz and Lima (2015) mentioned previously.…”

“…However, this reaction is very slow, with an equilibrium time of 4 days) . Cruz and Lima (2015) studied the influence of Mn 2+ ions in water on reverse cationic flotation of an iron ore sample (44.7% Fe and 31.8% SiO 2 ). They verified the minor influence of Mn 2+ ions on all response variables evaluated: mass recovery, Fe metallurgical recovery and the grade of Fe and SiO 2 in the obtained concentrates for MnCl 2 concentrations from 600 g/ton.…”

“…This study presents the influence of Mn 2+ ions on the floatability and zeta potential values of quartz and hematite, which are the main minerals present in the iron ore previously studied by Cruz and Lima (2015), at pH 10.5 with: i) ether amine, ii) starch/ether amine and iii) chelating EDTA)/starch/ether amine. The effects of manganese ions on both minerals' surface properties have not been deeply investigated.…”