TY - GEN
T1 - Mechanisms of nickel and zinc removal in oxic limestone systems and the application to metal mine drainages
AU - Miller, Andy
AU - Figueroa, Linda
AU - Wildeman, Tom
PY - 2006
Y1 - 2006
N2 - Limestone systems are generally used for acid neutralization of mining impacted waters. However they can also be designed to remove heavy metal constituents. The issues surrounding the design of a limestone system for metal removal are different from the issues involved in acid neutralization. Experiments were carried out to explore these issues by evaluating the interaction of CaCO3 with solutions containing a primary metal (Fe, Al), and a secondary metal (Zn, Ni). The fate of the secondary metals and their removal as a function of pH, alkalinity, and primary metal concentration are reported. Although these parameters by themselves are not necessarily good indicators of secondary metal removal, when coupled with the influent primary:secondary metal ratio, trends become apparent that can be used as design parameters. Zinc and Ni removals appear to be a function of Fe+3 concentrations and removals are shown to be as high as 97% and 87%, respectively, at near neutral pH values. The removal reaches a saturation point at an Fe:Zn ratio of 50:1, and for Ni the saturation ratio is 45:1 Zinc and Ni removals with Al gave ambiguous results.
AB - Limestone systems are generally used for acid neutralization of mining impacted waters. However they can also be designed to remove heavy metal constituents. The issues surrounding the design of a limestone system for metal removal are different from the issues involved in acid neutralization. Experiments were carried out to explore these issues by evaluating the interaction of CaCO3 with solutions containing a primary metal (Fe, Al), and a secondary metal (Zn, Ni). The fate of the secondary metals and their removal as a function of pH, alkalinity, and primary metal concentration are reported. Although these parameters by themselves are not necessarily good indicators of secondary metal removal, when coupled with the influent primary:secondary metal ratio, trends become apparent that can be used as design parameters. Zinc and Ni removals appear to be a function of Fe+3 concentrations and removals are shown to be as high as 97% and 87%, respectively, at near neutral pH values. The removal reaches a saturation point at an Fe:Zn ratio of 50:1, and for Ni the saturation ratio is 45:1 Zinc and Ni removals with Al gave ambiguous results.
KW - Co-precipitation
KW - Heavy metals
KW - Limestone drains
KW - Sorption
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U2 - 10.21000/jasmr06021302
DO - 10.21000/jasmr06021302
M3 - Conference contribution
AN - SCOPUS:84868629843
SN - 9781622760855
T3 - 7th International Conference on Acid Rock Drainage 2006, ICARD - Also Serves as the 23rd Annual Meetings of the American Society of Mining and Reclamation
SP - 1302
EP - 1313
BT - 7th International Conference on Acid Rock Drainage 2006, ICARD - Also Serves as the 23rd Annual Meetings of the American Society of Mining and Reclamation
PB - American Society of Mining and Reclamation
T2 - 7th International Conference on Acid Rock Drainage 2006, ICARD 2006, Also Serves as the 23rd Annual Meetings of the American Society of Mining and Reclamation
Y2 - 26 March 2006 through 30 March 2006
ER -