Aluminium Indirect carbothermic reductioncan be carried out using carbon andAl2O3,which forms an intermediate Al4C3 andthis can further yield aluminium metal ata temperature of 1900–2000 °C. it requires less energy and yields lessCO2 than the Hall-Héroult process.
The fire burns on the grate at (G), and the flames, passing over the bridge at (E), are deflected down ward by the low sloping roof of the furnace, and pass directly over the surface of the charge in the bed of the furnace at (B), finally escaping through the throat (F) into the chimney. Can change alumina to aluminium. Using less energy than molten electrolyte process.
Cont..The aluminum trichlorid precipitate is purified by dissolution and re-precipitation.The final product is calcined to formaluminathe alumina so produced has a higherpurity than alumina produced frombauxite by the Bayer process.
LithiumFusion methodpowdered silicate mineral is fused with CaCO3 andthe fused mass is extracted with HCl and filtered.The filtrate contains chlorides Li, Al, Ca, Na and Kwhereas silicon is removed as insoluble residue.The filtrate is evaporated to dryness and theresidue is extracted with pyridine in which onlyLiCl dissolves.Pyridine is distilled off while LiCl is left behind.
LiCl then undergoes the electrolysisprosess to obtain pure lithium metals.LiCI++ ↑ Li+ + CI-At cathode: Li+ + e- → LiAt anode : 2CI- - 2e- → CI2
Lithium extraction can be improve byadding new method.analytical MethodsThe pegmatite rocks as well as themineral products were analyzed bychemical (ICP-OES and XRF), optical andmineralogical analysis (XRD).
Electrodynamic FragmentationThe introduction of a electrodynamicfragmentation process allows the selectiveliberation of pegmatite minerals via highvoltage pulses.During electrodynamic fragmentation shockwaves travel through a solid submerged inwater.The high selectivity of the fragmentation isachieved through high tensile stress in theareas of grain boundaries, inclusions orcomposite interfaces, causing the material topredominantly break at these boundaries.
A: Polished section of a typical pegmatite piece. B: spodumene crystals separated after electrodynamic fragmentation. C: feldspar crystals separated after electrodynamic fragmentation; D: quartz crystals separated after electrodynamic fragmentation.A B C D
Increase the variety of final product.Decreasing the usage of energy to grind material that are not needed.