Activation effect of lead ions on scheelite flotation: Adsorption mechanism, AFM imaging and adsorption model

Laboratory Testing of Scheelite Flotation from Raw Ore in Sangdong Mine for Process Development

“…The adsorption mechanism of oleic acid with Ca-bearing minerals was investigated through zeta potential and FTIR analysis. The surface charge of mineral particles is changed by pulp pH value and affects the adsorption of the collector on mineral surfaces [33,34]. To investigate the adsorption mechanism of the reagents on the mineral surface, the effects of zeta potential are shown in Figure 2.…”

“…Oleic acid was used as a collector to react with all minerals and to measure the zeta potential again to confirm that the zeta potential values in all minerals were significantly negatively shifted. As a result, the reaction between these Ca-bearing minerals and oleic acid was found to be chemical adsorption, not physical adsorption with different pH and surface charges of minerals [34,35]. In order to further determination, the adsorption mechanism of flotation reagents on Ca-bearing mineral surfaces, the FTIR spectra of scheelite, calcite and fluorite before and after treating with flotation reagents were measured.…”

“…Corresponding to the preliminary experiment result, the pH of the pulp was adjusted to 11 and the experiments were conducted using NaOH, Na 2 S, CaO, and Na 2 CO 3 as pH modifiers. For a depressant and a collector of scheelite flotation, Na 2 SiO 3 and oleic acid were selected due to the preliminary experimental results and they are widely used in many conventional processes [5,23,24,34,[36][37][38]. Figures S1-S3 show the results of the experiment with the variable type of depressant, collector, and frother in this study.…”

“…is depressed, and remains in the flotation cell without floating. Oleic acid is one of the fatty acids with aliphatic tails and is known to have excellent performance in collecting the scheelite in froth flotation [1,34]. Figure 5d shows the WO3 grade and recovery of the concentrate with respect to the additional amount when oleic acid was used as a collector.…”

“…Based on the XRD analysis results in Figure 7, SEM-EDS analysis was carried out to determine the more accurate characteristics of the final concentrate, and it was confirmed that most of the composition was Ca, W and O in the scheelite (CaWO4) and very small impurities such as Mo and Si existed (Figure 8.). Oleic acid is one of the fatty acids with aliphatic tails and is known to have excellent performance in collecting the scheelite in froth flotation [1,34]. Figure 5d shows the WO 3 grade and recovery of the concentrate with respect to the additional amount when oleic acid was used as a collector.…”