Abstract: This invention relates to a process of reclaiming cement kiln dust and recovering the alkali content thereof which comprises leaching the cement kiln dust at elevated temperatures with an aqueous solution of potassium chloride, treating the leached slurry of cement kiln dust with a relatively small amount of oil and a fatty acid to flocculate, and preferably pelletize, the solids, in the aqueous phase, extracting the flocculated or pelletized dust from the aqueous phase, desirably lightly washing or rinsing the flocculated or pelletized material to still further reduce the alkali content, cooling the leaching solution to throw down or precipitate potassium chloride crystals by crystallization, and removing the crystallized material therefrom. The residual leaching solution, after removal of substantial amounts of potassium chloride crystals, is still saturated with potassium chloride in solution, and after reheating is available for recycling with additional cement kiln dust.