Study on the Activation of Scheelite and Wolframite by Lead Nitrate

Abstract

Abstract:The activation of scheelite and wolframite by lead nitrate with benzohydroxamic acid (BHA) as collector was investigated by means of micro flotation test, zeta potential measurement, X-ray photoelectron spectroscopy (XPS) analyses and density functional theory (DFT) calculation. The flotation results confirmed that the addition of lead nitrate can markedly enhance the recovery of scheelite and wolframite. In the zeta potential curves obvious positive shifts were observed with the presence of lead nitrate. Lead was detected on mineral surface in microscopic analysis and the survey XP spectra. Both the electrokinetic study and XPS analyses indicated that lead ion can be adsorbed onto mineral surface. In DFT calculation, the coordination model of BHA with metal hydroxyl ions (Ca (

Novel Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous: A Combined Experimental and Computational Study

“…The PXRD results of BHA crystal structure in our results coincided with those results from Podlaha et al, showing similar spectra of an iron-BHA crystal[53]. Pb(II)-BHA complexes may contribute to these peaks at 5.5°, 7.5°, 9.9°, 11.1°, 14.2°, and16.6°, which were reassembled with the metal-organic frame network of metal-BHA frame system with a typical π-π stacking structure[54]. Unfortunately, our attempts to grow a single crystal of the Pb(II)-BHA complex in aqueous solution to validate this hypothesis were unsuccessful.…”

“…Fortunately, our group first introduced the Pb complexes of benzohydroxamic acid (Pb(II)-BHA complexes) to effectively separate scheelite from calcium-bearing gangues by properly regulating the Pb/BHA ratio and pH [9,11]. Furthermore, as displayed in Figure 1(b), the novel flotation scheme (i in Figure 1 [a]), with Pb(II)-BHA complexes used as the collector, has shown better performance than the traditional activation flotation scheme (ii in Figure 1 [a]), which first added Pb(II) as the activator and subsequently added BHA as the collector [10,[12][13][14][15][16][17][18][19][20]. However, the effective microstructures of Pb(II)-BHA complexes in the solution and their interaction mechanisms with oxide minerals remain unclear.…”

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

“…Therefore, it is crucial to eliminate these minerals during mineral processing. Though new fatty acids formulations allowed to enhance significantly the separation contrast [12], an acceptable flotation selectivity cannot be attained without either a high energy consumption-e.g., using the Petrov's process that consists in heating the pulp to 80 • C [18]-or using ecotoxic reagents as lead-benzohydroxamic acid (Pb-BHA) complexes [19,20]. Thus, finding efficient, low cost, and environment friendly processes to beneficiate W-skarn ores is a real challenge for the next decades.…”

Novel Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study

“…Fortunately, our group first introduced the Pb complexes of benzohydroxamic acid (Pb(II)-BHA complexes) to effectively separate scheelite from calcium-bearing gangues by properly regulating the Pb/BHA ratio and pH [9,11]. Furthermore, as displayed in Figure 1(a), the novel flotation scheme (i in Figure 1 [b]), with Pb(II)-BHA complexes used as the collector, has shown better performance than the traditional activation flotation scheme (ii in Figure 1 (b)), which first added Pb(II) as the activator and subsequently added BHA as the collector [10,[14][15][16][17][18][19][20][21][22][23]. The effective microstructures of Pb(II)-BHA complexes in the solution, however, as well as their interaction mechanisms with oxide minerals remain unclear.…”