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Behavior of cadmium during roasting of zinc concentrate.

Authors
Landsberg-A; Yee-DH; Leavenworth-HW Jr.; Henry-JL
Source
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8543, 1981 Jun; :1-17
Link
NIOSHTIC No.
10006665
Abstract
The Bureau of Mines has undertaken research to elucidate the chemistry involved in the efficient recovery and control of minor elements in base metal smelting operations. These elements should be effectively recovered not only because they have commercial value, but also because of their potential hazard to workers' health and the environment, if they are not controlled during processing. Cadmium, a minor metal in zinc ores, is the subject of this report. The roasting step of the complex zinc-smelting process was chosen for investigation because of the high potential for removing cadmium by volatilization during this primary stage. Commercial roaster feed materials were used to determine the sequence of reactions and the effect of these reactions on the volatilization of cadmium. Electron microprobe examination of both the commercial roaster product and oxidized sulfide solid solutions prepared in the laboratory showed that oxidized iron was of prime importance in preventing cadmium volatilization. The mechanism by which iron prevents cadmium volatilization is proposed, and a preheating technique is recommended for more effectively recovering cadmium prior to roasting.
Keywords
Cadmium; Chemical reactions; Roasting; Zinc ores
Publication Date
19810601
Document Type
IH; Report of Investigations
Fiscal Year
1981
NTIS Accession No.
PB81-231060
NTIS Price
A03
Identifying No.
RI-8543
NIOSH Division
ALRC
Source Name
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8543
State
OR
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