Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1985-01-31
1986-09-30
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
423 27, 423 45, 423 46, 423 49, 423 98, 423109, 423131, 423150, 423155, 423324, 4236585, 75114, 75115, 75117, 75120, 75121, C22B 300
Patent
active
046145435
ABSTRACT:
A process is disclosed for the hydrometallurgical treatment of finely divided iron-containing steel plant dusts containing zinc, lead and such other metal values as calcium, manganese, silicon, magnesium, aluminum, cadmium, copper, and the like. The process is carried out by forming an aqueous slurry of the flue dust with a mixed lixiviant comprising HCl and H.sub.2 SO.sub.4, the amount of sulfate ion concentration being in excess of the chloride ion concentration and in stoichiometric excess of that required to sulfate substantially all of the lead and calcium present. The amount of chloride ion present as HCl should be sufficient to maintain the pH at about 1 to 4. The leaching is conducted at a temperature ranging from ambient to below the boiling point for a time at least sufficient to effect dissolution of at least zinc and other metal values and form a residue containing iron oxide, calcium sulfate and lead sulfate.
REFERENCES:
patent: 2264337 (1941-12-01), Seguine et al.
patent: 3375069 (1968-03-01), Duval
Duyvesteyn Willem P. C.
Jha Mahesh C.
Amax Inc.
Ciomek Michael A.
Doll John
Kalil Eugene J.
Stoll Robert L.
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