Role of decaethoxylated stearylamine in the selective flotation of hornblende and siderite: An experimental and molecular dynamics simulation study

Investigation of the specularite/chlorite separation using chitosan as a novel depressant by direct flotation

Selective adsorption mechanism of dodecylamine on the hydrated surface of hematite and quartz

Adsorption mechanism of water molecules on hematite (1 0 4) surface and the hydration microstructure

A scientific and rigorous study on the adsorption behavior and molecular mechanism of collector sodium oleate (NaOL) on a Ca2+-activated hydroxylated α-quartz surface was performed through experiments and density functional theory (DFT) simulations. The rarely reported hydroxylation behaviors of water molecules on the α-quartz (101) surface were first innovatively and systematically studied by DFT calculations. Both experimental and computational results consistently demonstrated that the adsorbed calcium species onto the hydroxylated structure can significantly enhance the adsorption of oleate ions, resulting in a higher quartz recovery. The calculated adsorption energies confirmed that the adsorbed hydrated Ca2+ in the form of Ca(H2O)3(OH)+ can greatly promote the adsorption of OL− on hydroxylated quartz (101). In addition, Mulliken population analysis together with electron density difference analysis intuitively illustrated the process of electron transfer and the Ca-bridge phenomenon between the hydroxylated surface and OL− ions. This work may offer new insights into the interaction mechanisms existing among oxidized minerals, aqueous medium, and flotation reagents.

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Interfacial microstructures and adsorption mechanisms of benzohydroxamic acid on Pb2+-activated cassiterite (1 1 0) surface

Sulfuration flotation is the most widely used technology in malachite beneficiation. However, the inhomogeneity of malachite surfaces usually results in a non-uniform sulfuration surface. The motivation of this work is attempt to adopt different functional combination collectors to enhance the sulfuration flotation of malachite. Accordingly, the flotation behaviors and adsorption mechanisms of benzohydroxamic acid (BHA) and sodium butyl-xanthate (SBX) on the surface of malachite were systematically investigated using flotation tests, zeta-potential measurements, Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and first-principle calculations. The test results of vulcanization flotation showed that the combined collectors of SBX with BHA possessed a higher recovery than only using SBH by 20%, indicating that there may be a synergistic effect between BHA and SBX. The IR and Raman spectroscopy demonstrated that both BHA and SBX could chemically adsorb onto the malachite surface. The density functional theory (DFT) calculation results further indicated that the combined adsorption energy of BHA and SBX was much lower than that of only BHA or SBX, which confirmed the synergistic effects of BHA and SBX on the malachite surface. This work may shed new light on the design and development of more efficient combined flotation reagents.

https://www.mdpi.com/2075-163X/11/1/59/pdf

Flotation Behavior and Synergistic Mechanism of Benzohydroxamic Acid and Sodium Butyl-Xanthate as Combined Collectors for Malachite Beneficiation

The invention discloses a novel copper-ammonia complex ion copper oxide ore sulfuration activator, and belongs to the technical field of mineral processing. By adding the prepared copper-ammonia complex ions, the sulfuration process of the copper oxide ore is enhanced, and the sulfuration effect of the copper oxide ore is more completed. Meanwhile, a xanthate and benzohydroxamic acid mixed collecting agent is used, so that the flotation recovery rate is greatly increased, and a good flotation index is achieved. By adding the copper-ammonia complex ions, adsorption of a sulfurizing agent on thesurface of the mineral is facilitated, so that the sulfurizing effect is enhanced. Secondly, by increasing the adsorbing capacity and the adsorbing speed of the collecting agent on the surfaces of the minerals, the over-sulfuration condition is eliminated, and sulfuration flotation of the copper oxide ores is facilitated. According to the method, the high flotation index of copper can be rapidlyand efficiently achieved with low cost, and the method is simple in process and convenient to operate.

Qiqi Zhou

Papers

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Adsorption mechanism of water molecules on hematite (1 0 4) surface and the hydration microstructure

Interfacial microstructures and adsorption mechanisms of benzohydroxamic acid on Pb2+-activated cassiterite (1 1 0) surface

Flotation Behavior and Synergistic Mechanism of Benzohydroxamic Acid and Sodium Butyl-Xanthate as Combined Collectors for Malachite Beneficiation

Copper-ammonia complex ion sulfuration activator and application thereof