Acid leaching and rheological behaviour of a siliceous goethitic nickel laterite ore: Influence of particle size and temperature

Document Type

Journal Article

Publisher

Pergamon Press

School

School of Engineering

RAS ID

20186

Comments

MacCarthy, J., Nosrati, A., Skinner, W., & Addai-Mensah, J. (2015) Acid leaching and rheological behaviour of a siliceous goethitic nickel laterite ore: Influence of particle size and temperature. Minerals Engineering, 77, 52-63. DOI: 10.1016/j.mineng.2014.12.031. Available here.

Abstract

This study investigates the isothermal, batch, H2SO4 acid leaching behaviour of siliceous goethitic (SG) nickel (Ni) laterite ore and its links to pulp rheology. Specifically, the effect of feed ore particle size (−0.2 vs −2.0 mm), leaching temperature (70 vs 95 °C) and pulp rheology on Ni and pay metal, cobalt (Co) extraction kinetics and yield was studied for 4 h on 40 wt.% solid dispersions at pH 1. The leaching behaviour was distinctly incongruent, reflecting the disproportionate proliferation of major gangue mineral’s constituent elements (e.g., Fe, Al, Mg, Na, Si) alongside Ni and Co in the pregnant leach solution. At 70 °C, Ni/Co extraction rates were notably lower (

DOI

10.1016/j.mineng.2014.12.031

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