Process for solidifying aqueous wastes and products thereof
AssigneePEC-Engineering Societe Anonyme
InventorJean Quienot
Life of this patent
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Abstract
The water-soluble pollutants contained in aqueous industrial, agricultural and domestic waste materials are converted into a water-insoluble solid mass with improved resistance to leaching of the pollutants therefrom by treatment with a particulate metallurgical slag under alkaline conditions, in the presence of a hydration-promoting agent for the slag, e.g., gypsum.
Claims13
In a process for the treatment of solidifiable aqueous wastes containing water-soluble environmental pollutants with a sufficient quantity of setting agent which converts the pollutants into a water-insoluble mass, the improvement which comprises treating the aqueous waste in a homogeneous condition, employing as the setting agent a particulate water-insoluble slag from metal refining, in the presence of a slag hydration-promoting combination of, sulfate and alkali metal ions and wherein 100 parts of starting waste are mixed with 5 to 35 parts of said slag, 0.02 to 15 parts of alkaline agent, 0.2 to 30 parts of said hydration-promoting combination, 0 to 2 parts of emulsifying agent and 0 to 150 parts of pozzolana, fly ash or clinker, there being sufficient alkalinity in the additives to yield a pH above 8.5 in the resultant mixture.
Dependencies are inferred from the claim text.