Busting the sceptics…30 Jul 2021 09:15
… about our resource:
Read the bullish extract below from our next door neighbour EMH’s quarterly report just published - focus particularly on high recovery level and metallurgy.
“LOCKED-CYCLE TEST RESULTS PROVE ABILITY TO PROCESS ZINNWALDITE
Geomet commissioned the LCTs with the principal objective of confirming the flowsheet for the processing of zinnwaldite concentrate from Cinovec run-of-mine ore. The LCTs differ from previous proof of concept and optimisation testwork conducted during the Cinovec PFS by confirming the effect of recycle streams (which carry some lithium and other alkali metals) on the overall recovery of lithium from the pregnant leach solution resulting from the water leaching of the roasted zinnwaldite concentrate and the ability to produce battery grade lithium carbonate. The LCTs have been performed by Dorfner Anzaplan, Germany and have been supervised by Lithium Consultants Australasia and SMS group Processing Technologies GmbH (“SMS”) in parallel with the FrontEnd Engineering Design (“FEED”) programme being undertaken by SMS. The LCTs have processed zinnwaldite concentrate from drill core samples taken from the southern part of the Cinovec orebody, representing ore that will be processed in the first five years of the mine plan. The recovery of up to 92% of the lithium in the concentrate sample compares favourably with the similar recovery in the PFS flowsheet of 91%. However, this new recovery of up to 92% is before lithium plant DFS/FEED optimisation testwork that will be targeted in specific process areas and which is expected to increase hydrometallurgical recovery in the lithium plant to more than 92%. Separate metallurgical testwork on the Front-End Comminution and Beneficiation (“FECAB”) circuit is underway and is designed to improve upon the lithium recovery of 90% from ore to concentrate. This testwork will be reported at a later date.
…
The zinnwaldite mica at Cinovec contains alkali metals other than lithium, including potassium, rubidium and caesium, which are leached into solution and will build up in the plant if not removed from the circuit.
The LCTs have proven conclusively that the unwanted alkali metals can be removed preferentially by control of temperature, pH, solution saturation and crystallisation. It has been confirmed that these alkali metals will not build up due to recycles within the plant. The achievement of this within four LCTs with minor loss of lithium is a major step towards confirmation of process plant design.
LITHIUM HYDROXIDE PRODUCTION
The current LCTs have been commissioned to confirm the lithium carbonate processing flowsheet. The Cinovec Project has optionality to either produce a battery grade lithium carbonate product or to further process the lithium carbonate to produce battery grade lithium hydroxide.”