Safe disposal of metal values in slag

Details Safe disposal of metal values in slag Safe disposal of metal values in slag

C - Chemistry, Metallurgy

22

B

53/342

C22B 5/00 (2006.01) C22B 7/00 (2006.01) C22B 7/04 (2006.01)

Patent

CA 1176854

ABSTRACT OF DISCLOSURE The method of safely disposing of sludge containing metal values capable of displaying toxic ecological properties including the steps of deriving from an organic or inorganic sludge an intermediate product such as a dewatered sludge or an incinerated ash, and adding this intermediate product to a metal smelting step of a type producing a slag such that most of the metal values become encapsulated in the slag, although some precious metal values may be recovered with the metal being smelted, and may be subsequently separated therefrom by appro- priate metal winning steps, the sludge product bringing to the smelting process certain additives needed therein such as silica and phosphates for the slag, alumina and magnesium to lower the viscosity of the molten slag, and organic matter serving as reducing agents.

382084

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