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US 6,962,562 B2Granted
Sludge inerting method
AssigneeSolvay (Societe Anonyme)
InventorsGuy Depelsenaire, René Derie
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Abstract
Process for rendering inert a sludge (1) comprising heavy metals and organic matter, according to which phosphoric acid (2) is added to the sludge and the latter is subjected to calcination (6). A hydraulic binder (9) is mixed with the product of the calcination (7) and mixed with water (8). The resulting mixture (11) is subjected to setting and curing.
Claims19
A process for rendering inert sludge comprising heavy metals organic matter, the process comprising:
- subjecting the sludge to a calcination to produce a calcination product;
- mixing the calcination product with water to provide a mixture;
- and
- subjecting the mixture to setting and curing, wherein phosphoric acid is added to the sludge before the calcination stage, and
- wherein the calcination is carried out under a controlled nonoxidizing atmosphere.
2 more elements
Dependencies are inferred from the claim text.