Process for freeing mineral acids from heavy metals

Details Process for freeing mineral acids from heavy metals Process for freeing mineral acids from heavy metals

1987-01-30

1988-10-11

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423531, C01B 2516, C01B 1790

Patent

active

047770287

ABSTRACT:
Mineral acids are freed from heavy metals, especially copper, arsenic, antimony and lead by precipitating the metals in sulfide form. To this end, the mineral acid is reacted with hydrogen sulfide or an alkali metal sulfide solution under pressure and with thorough agitation, and formed solid matter is subsequently separated from the mineral acid under the pressure selected. The mineral acid may conveniently by admixed initially with a filter aid and then treated with hydrogen sulfide or the alkali metal sulfide solution.

REFERENCES:
patent: 1538089 (1925-05-01), Carothers et al.
patent: 1597984 (1926-08-01), La Bour
patent: 3790661 (1974-02-01), Wasel-Nielen et al.
patent: 3873581 (1975-03-01), Fitzpatrick et al.
patent: 4378340 (1983-03-01), Berghend
Ullmans Encyklopaedie der technischen Chemie, 4th Ed., vol. 18, Verlag Chemie, Weinheim, 1979, pp. 312, 321-322.
Winnacker-Kuchler Chemische Technologie, 4th Ed., vol. 2 ("Inorganic Technology I"), ed. Hainisch, H. et al., Carl Hanser Verlag, Munich 1982, p. 219.

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