procedures for the extraction of potassium from potassium containing residue solids

摘要

Potassium is recovered as a dilute KOH solution from residue solids resulting from conversion of manganese ore to K.sub.2 MnO.sub.4 by reacting the solids with a Ca(OH).sub.2 under specified conditions. The resulting KOH solution can be returned to the K.sub.2 MnO.sub.4 plant and the solids of reduced potassium content are suitable for disposal in a landfill.