Abstract: A landfill composition containing no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of the landfill composition containing an industrial waste product, placed in a 400 micron conical paint filter for five minutes, passes no water through the filter, is produced by admixing the industrial waste product with 5 to 80 weight percent, based on the total solids content of the industrial waste product, of finely grounded granulated blast furnace slag comprising 30-40 percent SiO.sub.2, 40-45 percent CaO, 10-20 percent Al.sub.2 O.sub.3, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe.sub.2 O.sub.3 and a trace of phosphorous, the finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm/g.

Abstract: The solids content of toxic waste chromium ore waste and of certain types of mud or sludge dredged from salty or brackish water are combined together and stabilized in a hardened state by adding to the settled volume of the mixed materials about 5% to about 30% by weight of the solids of finely ground basic granulated blast furnace slag, with intimate mixing, and maintaining the mixture in a quiescent state to produce a sedentary mass having load supportive properties suitable as landfill and whose impermeability effectively prevents leaching of any chromium ore waste by contact with surface or ground water. In this process for producing a sedentary and essentially impermeable load bearing mass toxic hexavalent chromium in the chromium ore waste is reduced to less or non-toxic trivalent chromium.