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Removal of metal cations from water using zeolites.

Authors
Zamzow-MJ; Murphy-JE
Source
Sep Sci Technol 1992 Nov; 27(14):1969-1984
NIOSHTIC No.
10012089
Abstract
Zeolites from abundant natural deposits were investigated by the Bureau of Mines for efficiently cleaning up mining industry wastewaters. Twenty-four zeolite samples were analyzed by x-ray diffraction and inductively coupled plasma. These included clinoptilolite, mordenite, chabazite, erionite, and phillipsite. Bulk densities of a sized fraction (-40, +65 mesh) varied from 0.48 to 0.93 g/mL. Attrition losses ranged from 1 to 18% during an hour-long shake test. The 24 zeolites and an ion-exchange resin were tested for the uptake of Cd, Cu, and Zn. Of the natural zeolites, phillipsite proved to be the most efficient, while the mordenites had the lowest uptakes. Sodium was the most effective exchangeable ion for exchange of heavy metals. Wastewater from an abandoned copper mine in Nevada was used to test the effectiveness of clinoptilolite for treating a multi-ion wastewater. The metal ions Fe3+, Cu2+, and Zn2+ in the copper mine wastewater were removed to below drinking water standards, but Mn2+ and Ni2+ were not. Calcium and NH4+ interfered with the uptake of heavy metals. Adsorbed heavy metals were eluted from zeolites with a 3% NaCl solution. Heavy metals were concentrated in the eluates up to 30-fold relative to the waste solution. Anions were not adsorbed by the zeolites.
Keywords
Mineral-deposits; Mineral-processing; Minerals; Mining-industry; Waste-treatment; Metal-compounds; Metallic-compounds; Metallic-minerals; Heavy-metals; Copper-compounds
CODEN
SSTEDS
CAS No.
7440-70-2; 7440-23-5; 7440-66-6; 7440-50-8; 7440-43-9
Publication Date
19921101
Document Type
Journal Article
Fiscal Year
1993
NTIS Accession No.
NTIS Price
Identifying No.
OP 49-93
Issue of Publication
14
ISSN
0149-6395
NIOSH Division
RERC
Source Name
Separation Science and Technology
State
NV
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