IN-SITU LEACH PROJECT AT AVOCA, IRELAND
The project comprised laboratory test work and mathematical analysis as well as on-site work. The laboratory test work consisted of shake flasks tests, column leach tests for 2 particle sizes, studies on the hydrodynamic behaviour of the columns; a mathematical model was developed which permits the variation in metal concentrations of all process streams in an in-situ leach operation to be predicted as a function of time. The on-site work comprised development work and operation of the leach facility: Four separate circuits are incorporated: the main circuit, which delivers the liquor to the top of the ore pile; the make-up water circuit, which uses mine water to compensate for any loss of leach liquor; the acid circuit, with automatic pH control system the cementation circuit, which removes copper from solution by means of precipitation on scrap iron. pH and Eh of all process streams were measured, and liquor delivery rate, loss rate, and acid consumption were calculated. Samples of each stream were taken for Cu, Zn and Fe analysis by atomic absorption. This data was used in conjunction with the mathematical model for in-situ leaching developed at IIRS to calculate the ongoing rates of metal extraction throughout the operation.
Bibliographic Reference: WORKSHOP ON MINERALS LEACHING, BRUXELLES (BELGIUM), NOV. 17, 1983, PP. 64-81 EUR 9606 EN-FR (1984) FS, 141 P., BFR 450, EUROFFICE, LUXEMBOURG, POB 1003
Record Number: 1989123099400 / Last updated on: 1987-01-01
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