Chemical fixation of desulfurization residues

Details Chemical fixation of desulfurization residues Chemical fixation of desulfurization residues

1976-02-12

1977-09-20

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106109, 106110, 106118, 423242, 423244, C04B 100

Patent

active

040494624

ABSTRACT:
Chemical fixation of industrial desulfurization residues by forming an intimate admixture of the desulfurization residue, such as a flue gas desulfurization sludge, with an alkaline calcination stack dust, such as a cement kiln dust, in the presence of sufficient water to provide a mass of workable consistency, adjusting the pH of the alkaline mass with acid, such as sulfuric or phosphoric acid, to a value of below about 7, e.g. in the acid range of from below about pH 7 down to about pH 5, and drying the pH adjusted mass to constant weight, preferably after forming the pH adjusted mass into a selectively shaped article, whereby to produce an environmentally stable and leach-resistant hardened solid, cement-like fixed product.

REFERENCES:
patent: 3159497 (1964-12-01), Yamaguchi
patent: 3720609 (1973-03-01), Smith et al.
patent: 3773533 (1973-11-01), Omoto et al.
patent: 3785840 (1974-01-01), Minnick et al.
patent: 3855391 (1974-12-01), Selmeczi et al.
patent: 3870535 (1975-03-01), Minnick et al.
patent: 3897259 (1975-07-01), Nakajima
patent: 3920795 (1975-11-01), Selmeczi et al.
patent: 3929964 (1975-12-01), Thoma

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