A two-stage ethylene carbonate heat treatment converts residual Li into lithium carbonate, yielding higher-purity recycled carbon material.
Carbonate-fed carbonic acid converts poorly soluble lithium compounds into lithium hydrogen carbonate, improving scrap recovery and purity.
A sequential crystallization process recovers alkali from sodium carbonate purge streams to produce saleable crystals.
Hydrogen peroxide oxidizes sulfides in aqueous alkali solutions to soluble products, preventing hydrogen sulfide emissions during bicarbonate decomposition.
Selective leaching removes sodium chloride and silicates from waste solids, preventing equipment scaling during soda ash production.