Rheology of nickel tailings slurries - concentration and temperature effects
Leong, Y.K., Tonnochy, D., and Harrington, P. (2003) Rheology of nickel tailings slurries - concentration and temperature effects. Proceedings of Chemeca 2003 the 31st Australasian Chemical Engineering Conference. Chemeca 2003 the 31st Australasian Chemical Engineering Conference , 28 September - 1 October 2003, Adelaide, SA, Australia .
|PDF (Published Version) - Repository staff only - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader|
View at Publisher Website: http://www.chemeca2010.com/
Queensland Nickel's tailings slurries contain a high concentration of dissolved ammonia. The ammonia is stripped by steam in a multi-stage bubble cap still. Blocking of the hubble caps by settling tailings is a common occurrence. This is undesirable as it affects the overall productivity of the plant. Understanding the settling, time-dependent and rheological behaviour of the tailings slurries is an important step towards solving this problem. The tailings slurries display yield stress and shear thinning behaviour where the viscosity decreases with increasing shear rate. At concentrations greater than 50wt% solids the yield stress and viscosity increases exponentially with concentration. Temperature appears to have only a small effect on the viscosity and yield stress. The time scale of settling for low solids slurry of 22.2wt% is relatively fast, in minutes, while that for the 50wt% sluny is in hours.
|Item Type:||Conference Item (Refereed Research Paper - E1)|
|Keywords:||nickel tailings; shear stress-shear rate; slurries; temperature effects; viscosity; yield stress|
|FoR Codes:||09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 100%|
|SEO Codes:||96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 100%|
|Deposited On:||13 Apr 2010 09:18|
|Last Modified:||12 Feb 2011 03:07|
Last 12 Months: 0
Repository Staff Only: item control page