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Pressure Acid Leaching of Nickel Laterite Ores: an in Situ Diffraction Study of the Mechanism and Rate of Reaction by Ian C. Madsen; Nicola V. Y. Scarlett; Barry I. Whittington is a Materials Science article available to read on EtoBox.

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This paper outlines the use of an innovative system for the__in situ__investigation of hydrothermal reactions by X-ray diffraction. The key features are the use of: (i) a purpose-built capillary reaction vessel which allows close emulation of the conditions present in mineral processing plants; (ii) Mo__K__α radiation, to ensure that the X-ray beam penetrates through the capillary, and (iii) an Inel CPS120 position-sensitive detector, to enable simultaneous collection of a wide range (120° 2θ) of diffraction data. The pressure acid leaching (PAL) of nickel laterite ores is used to illustrate the capabilities of this system, with a particular focus on the PAL of saprolite in strong H~2~SO~4~at 493 K. Saprolitic ore, which largely consists of serpentine mineral phases [(Mg,Fe,Ni,Al)~3~(Si,Al)~2~O~5~(OH)~4~], undergoes a number of mineralogical changes during both the acid leaching reaction and subsequent cooling, thus making it difficult to examine accurately using traditional post-reaction__ex situ__techniques. In particular, kieserite (MgSO~4~.H~2~O), which forms during leaching, has a negative temperature coefficient of solubility, causing it to dissolve on cooling. The__in situ__

Who reads Pressure Acid Leaching of Nickel Laterite Ores: an in Situ Diffraction Study of the Mechanism and Rate of Reaction?

Author

Ian C. Madsen; Nicola V. Y. Scarlett; Barry I. Whittington

Publisher

International Union of Crystallography; Blackwell Publishing Inc.; International Union of Crystallography (IUCr) (ISSN 0021-8898)

Published

2005

Language

EN

Field

Materials Science (Physical Sciences)