Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1979-10-01
1981-06-30
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75114, 75120, 423 94, 423 98, 423494, C22B 1304
Patent
active
042760844
ABSTRACT:
A hydrometallurgical process is used to recover lead from a lead-bearing ore concentrate. The lead-bearing ore concentrate is leached with a solution of cupric chloride in order to precipitate lead as lead chloride, produce elemental sulfur and substantially leave the balance of the ore concentrate sulfides in unreacted form. The residue of the cupric chloride leach is leached with a brine solution in order to solubilize the lead chloride to the exclusion of the balance of the residue. Thereafter, the lead chloride is crystallized from the brine solution. Elemental lead may be obtained by the reduction of the lead chloride crystals.
The present process avoids air pollution problems inherent to smelting processes, allows for a high recovery of lead of 97% or greater and allows for the direct production of a high purity lead.
REFERENCES:
patent: 704639 (1902-07-01), Hoepfner
patent: 1346642 (1920-07-01), Elmore
patent: 3981962 (1976-09-01), Smyres et al.
patent: 3998628 (1976-12-01), Gandon et al.
patent: 4135993 (1979-01-01), Um
Mellor, "Comprehensive Treatise on Inorganic & Theoretical Chemistry", vol. 7, 1927, Longmans, Green & Co., N.Y., pp. 712 and 713.
Wong et al., World Mining and Metals Technology, Sep. 1976, pp. 603-622.
Scheiner et al., 1978 Mining Yearbook, Colo., pp. 133-138.
Murphy et al., Bureau of Mines, RI (1976) 7913 pp. 1-8.
Haver, Bureau of Mines, RI 8105 (1976) pp. 1-17.
Muir et al., J. Australasian Inst. of Mining and Metallurgy, No. 259 (Sep. 1976), pp. 23-35.
Bagdasarian, Trans. of Am. Electrochem. Soc., vol. 51, 1927, pp. 449-494.
Reynolds James E.
Williams Alan R.
Hazen Research Inc.
Ozaki G.
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