"Every flow sheet is tailored to the specific concentrated" - thanks for stating that captain obvious but this generally applies to extraction of many different types of minerals.
Did you ask yourself why the SO4/Li ratio is actually important and why companies quote it - it actually affects the evaporation process. The research demonstrates that "Concentration of Li+ , K+ , Mg2+ Ca2+ grows continuously and exponentially as evaporation increases, while Na+ and SO4 2- concentration decreases due to their precipitation"
This was from research on brines in the South America Puna region, titled "Influence of The Evaporation Rate Over Lithium Recovery From Brines"
Can you list these "Many producers with raw brine containing moderate to high magnesium ratios" and what range of SO4/Li ratios they have in their resource? When AGY quoted their OPEX (2018), 65% of their costs was on chemicals / reagents !!
That graph from Neo Lithium stands and why the SO4/Li ratio is important then correlate that with the enormous filtration issues AGY had with Mg in their 1st and 2nd filtration stages
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