CaCO3 precipitate can be produced by reaction of an aqueous solution of Na2CO3 and CaO, the byproduct being NaOH. Following decantation, slurry leaving the precipitation tank is 5 wt% CaCO3, 0.1 wt% NaOH, and the balance water. One hundred thousand lb/h of slurry is fed to a two-stage, continuous, countercurrent washing system to be washed with 20,000 lb/h of fresh water. Underflow from each thickener will contain 20 wt% solids. Determine % recovery of NaOH in the extract and wt% NaOH in the dried CaCO3 product. Is it worthwhile to add a third stage?

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Reactive Processes

Reactive processes are the processes in which any reaction occurs. The reactions can be any combination reaction, decomposition reaction, combustion reaction, oxidation reaction, reduction reaction, neutralization reaction, displacement reaction, or double displacement reaction.