Process for reclaiming cement kiln dust and recovering chemical

Details Process for reclaiming cement kiln dust and recovering chemical Process for reclaiming cement kiln dust and recovering chemical

1976-01-14

1977-06-21

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

23302R, 106100, 423499, C01D 308

Patent

active

040311848

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.

REFERENCES:
patent: 1354642 (1920-10-01), Anderson et al.
patent: 1402173 (1922-01-01), Moon
patent: 2347147 (1944-04-01), Booth
patent: 2988504 (1961-06-01), Mazurek
patent: 3647395 (1972-03-01), Dean
patent: 3925534 (1975-12-01), Singleton et al.
Yusa et al, "Separating Liquids from Solids by Pellet Flocculation," Research Journal (July 1975), pp. 397-402.
Kirk-Othmer, "Encyclopedia of Chemical Technology," vol. 8, 2nd Edition, (1963), pp. 837, 838, 845-847.

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