Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1976-09-23
1978-01-31
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75109, 75117, 75120, 75121, 423105, 423622, C22B 1924
Patent
active
040713571
ABSTRACT:
A method for recovering a substantially impurity-free zinc oxide product from steel-making flue dust or a similar material which comprises leaching the flue dust with concentrated ammonia and carbon dioxide to dissolve zinc and unwanted impurities, cementing the leach filtrate with zinc to remove copper, cadmium, and lead impurities, conducting a steam distillation on the cementation filtrate to precipitate basic zinc carbonate, remove the ammonia and carbon dioxide, and iron impurities, and filtering to provide a residue of essentially basic zinc carbonate, sulfur, and chromium. This residue is then washed to remove soluble sulfates, dried, and calcined at high temperatures to break down the basic zinc carbonate into zinc oxide, water washed to remove chromium and the residue of the water wash dried to produce the desired impurity-free zinc oxide product. The two water washes may be combined into one step performed after the calcining step to remove both sulfur and chromium in one wash step.
REFERENCES:
patent: 803472 (1905-10-01), Cunnington
patent: 1706143 (1929-03-01), Corbould
patent: 1780323 (1930-11-01), Waring
patent: 1879834 (1932-09-01), Waring et al.
patent: 2144299 (1939-01-01), Sessions et al.
patent: 3849121 (1974-11-01), Burrows
Hazen Research Inc.
Ozaki G.
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