Abstract: Method for disposal of oily refinery sludges containing a hydrocarbon component, a solids component comprising sediments such as sand, silt, rust or scale, and water in an operating rotary kiln comprising a heated, rotating cylinder containing in-process mineral matter comprising analyzing the oily refinery sludge to determine its composition, drying the oily refinery sludge to a bulk granular material having an energy content of at least about 4,000 BTU per pound, and charging the dried bulk granular material to the rotary kiln and burning the bulk granular material therein.

Abstract: Process for recycle and reuse of soil, sludge, sand, or rock containing: (a) at least about 16 wt % calcium oxide, about 5 wt % silica, about 1 wt % alumina, about 0.5 wt % Fe.sub.2 O.sub.3, or about 0.76 wt % magnesia; and (b) at least about 5 ppm arsenic, about 100 ppm barium, about 1 ppm cadmium, about 5 ppm chromium, about 5 ppm lead, about 0.2 ppm mercury, about 1 ppm selenium, or about 5 ppm silver. The process comprising mixing the soil, sludge, sand, or rock with an amount of inorganic constituents to form a raw material mix having a chemical composition suitable for the manufacture of Portland cement, charging the slurry to a cement kiln, heating the slurry in the kiln to a temperature sufficient to form a cement clinker, and removing the cement clinker from the rotary kiln.