Enhanced Flotation Separation of Cassiterite from Calcite Using Metal-Inorganic Complex Depressant

At present, the research on flotation separation of cassiterite and gangue minerals is mainly focused on the development of new collectors or depressants, while the research on combined depressants is rare. In this study, the flotation separation of cassiterite and the typical gangue mineral, calcite, was investigated using the metal-inorganic complex depressant AlSS, composed of aluminum sulfate (Al2(SO4)3) and water glass (Na2SiO3·4H2O). The flotation results indicated that, with the assistance of Al3+, the inhibition effect of SS (water glass) on calcite is significantly enhanced, while the inhibition effect on cassiterite is almost unchanged. The zeta potential and adsorption measurements proved that the formation of the negatively charged colloidal particles composed of Alm(OH)n3m−n and SiOm(OH)n4−2m−n tended to adsorb on the positively charged calcite surface, inhibiting the adsorption of sodium oleate (NaOL), while the adsorption of the colloidal particles on the negatively charged cassiterite surface is relatively less. The contact angle measurements indicate that the contact angle of cassiterite in the NaOL + AlSS solution is obviously larger than that of calcite, which indicates that cassiterite has better floatability in this system. The X-ray photoelectron spectroscopy (XPS) analysis confirms the Al and Si species are adsorbed on the surface of calcite, but not on the cassiterite. In addition, the adsorption of AlSS on cassiterite and calcite changes the chemical environment on the calcite surface, indicating that the adsorption of AlSS on the mineral surface is more inclined to be through a chemical reaction.

Synthesis and Characterization of Organic–Inorganic Complex

An new method is described for fabricating BiFeO3@PVDF composites using sultraviolet light to motivate the surface electronic of BFO conduct reduction system. The synthesis scheme consists of: (a) preparation of BiFeO3 nano particles using Hydrothermal synthesis method. (b) oxidation of the PVDF powders in the effect of the mixed gas (ozone and dioxygen) and sultraviolet light. (c) redox reaction of the oxidated PVDF and BiFeO3 nano particles in the effect of sultraviolet light. The synthesized BiFeO3@PVDF composites show that this method could increase the compatibility between PVDF and BiFeO3 nano particles. Moreover, a formation mechanism for the composite is proposed.

A flexible composite solid electrolyte with a highly stable interphase for dendrite-free and durable all-solid-state lithium metal batteries

A flexible composite solid electrolyte has been successfully designed. Benefitting from the synergistic effect of the organic–inorganic complex, such PBL-CSE membrane shows superior electrochemical properties and interface stability.