Process for extraction of nickel, cobalt, and other base...

Details Process for extraction of nickel, cobalt, and other base... Process for extraction of nickel, cobalt, and other base...

2011-06-21

2011-06-21

Wyszomierski, George (Department: 1733)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C075S750000, C423S150100

Reexamination Certificate

active

07964016

ABSTRACT:
The present invention embodies a process for extraction of nickel, cobalt, and other metals from laterite ores by heap leaching, and of the product obtained as well, characterized by the fact that it is comprised of crushing (I), agglomeration (II), stacking (III), and heap leaching (IV) stages, with this last stage being a continuous, counter-current, heap leaching system with two or more stages, comprised of two phases, one of which is composed of the ore (solute), and the other is composed of the leaching solution, or solvent, which are supplied at opposite ends of a series of stages and flow in opposite directions. Upon cessation of leaching in the last stage, its solute is removed and a new stage is introduced at the first position, formed by new ore (solute) to be leached by the solvent solution, which is introduced from the last stage, percolating or flowing though all the previous stages until it reaches the first stage, being separated if loaded with target metals (PLS).

REFERENCES:
patent: 5077021 (1991-12-01), Polizzotti
patent: 6312500 (2001-11-01), Duyvesteyn et al.
patent: 1001555 (1978-12-01), None
patent: 1003569 (1978-12-01), None
patent: WO2004/031422 (2004-04-01), None
patent: WO2005/005671 (2005-01-01), None
D.J.A. van Zyl et al. Introduction to Evaluation, Design, and Operation of Precious Metal Heap Leaching Processes, Society of Mining Engineers, Inc., Littleton, CO, 1988, p. 13-16 and 82.
R. Thiel and M.E. Smith, State of the Practice Review of Heap Leach Pad Design, Proceedings of the 17th Annual GRI Conference: Hot Topics in Geosynthetics-IV, Las Vegas, NV, Dec. 15, 2003, 17 pages.

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