The behaviour of zinc, cadmium, thallium, tin and selenium during ferrihydrite precipitation from sulphate media.

Abstract Ferrihydrite is often the initial precipitate resulting from the rapid neutralization of Fe(III) sulphate solutions, and it seems to be a major constituent of zinc plant neutral leach residues. The most important parameters affecting ferrihydrite precipitaton are temperature, solution pH and the neutralization rate. Low temperatures and rapid neutralization rates yield poorly filterable ferrihydrite, whereas higher temperatures and slower neutralization rates produce readily filterable precipitates; in all instances, however, the precipitates are two-line ferrihydrite. Significant amounts of Zn are incorporated in the ferrihydrite precipitates, and the Zn contents increase with increasing Zn concentration, pH or temperature. Generally, the sulphate contents of the precipitates decrease as the Zn contents increase, and this may indicate that the Zn is adsorbed on the ferrihydrite. Discrete Zn phases were not detected. Neither Cd nor Tl is precipitated with ferrihydrite, although thallium jarosite co-precipitates with ferrihydrite at high Tl concentrations and elevated temperatures. Virtually all
Keywords: Environment, Ferrihydrate, Zinc, Cadmium, Thallium, Tin, Selenium.
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Summary: N/A
Publication: CIM Bulletin
Author(s): Elhachmi Es-Sadiqi
Keywords: Technical Note
Issue: 1019
Volume: 91
Year: 1998
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Summary: Although many factors play roles in the estimation of recoverable reserves, smoothing effect and conditional bias are considered major geostatistical issues in the estimation. This paper introduces measures for smoothing effect and conditional bias, and provides insights into their relation to the estimation of recoverable reserves. Both smoothing effect and conditional bias are intrinsic to the information effect and kriging estimators. For a given level of drilling information, however, it...
Publication: CIM Bulletin
Author(s): Guocheng Pan
Keywords: Geology, Ore reserve estimation, Smoothing effect, Conditional bias, Recoverable reserves, Gold deposits.
Issue: 1019
Volume: 91
Year: 1998
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Summary: Successful relationships between mining companies and local stakeholders are now an essential part of the social contract of Òdoing businessÓ (Prescott, 1995). The methodology presented in this paper is designed to assist mining companies in understanding and building relationships with diverse stakeholder groups. The methodology starts by recognizing that mining projects have a natural life cycle which can be used to identify when new external affairs strategies are required. In designing an...
Publication: CIM Bulletin
Author(s): K.L. Azinger
Keywords: Stakeholder analysis, Public affairs, Relationship mapping, NWT Diamond Project.
Issue: 1019
Volume: 91
Year: 1998
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