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

Abstract

In this paper, a detailed study of the influence of Mn 2+ ions on quartz and hematite flotation (at pH 10.5 with starch/amine as depressor/collector) in the absence and presence of ethylenediaminetetraacetic acid (EDTA) is presented. By using zeta potential measurement and a careful analysis of manganese species present in water for dosages in which manganese hydroxide precipitated, we confirmed that the depression of both minerals by Mn 2+ ions is due to the following: (i) the adsorption of Mn hydroxy complexes (Mn 2 (OH) 3+ and Mn(OH) +); (ii) Mn 2+ and mainly (iii) the precipitation of Mn(OH) 2 on mineral surfaces. These effects hindered the adsorption of amine species on the surfaces of the minerals (quartz and hematite). EDTA was used to complex Mn 2+ to restore the recoveries of both minerals. This was confirmed by the species distribution diagrams of Mn and EDTA-Mn in water. Conditioning with starch followed by amine at pH 10.5 enabled a selective separation of these minerals.

Water Quality Assessment of Tekala River, Selangor, Malaysia

“…pH can also affect the solubility and toxicity of chemicals and heavy metals in the water. Various concentration of solution, solid or gaseous that enters into river can influence pH of the river due to reaction of dissociation which may produce H+ or OH-ions (Chang et al, 1983;Lelis et al, 2016). Based on the result, pH ranged from 5.00 to 6.88.…”