| 摘要 |
<p>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 appropriate 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.</p> |
