SOLID-LIQUID CALCINATION (SLC) TECHNOLOGY: COMMISSIONING AND DEMONSTRATION OF A FULL-SCALE UNIT

Pulpeiro, J.,Gayol, M.A., Carruthers, A., Fenger, F. and Fleming, L.

The Solid-Liquid Calcination Technology (SLC), forms the basis for a new, user friendly process jointly developed by Alcan , FFE Minerals (sister company to F.L.Smidth), Alumina Espanola and Aughinish Alumina with the specific aims of:

  • Eliminating the environmental impact resulting from dumping waste sodium salts (salt cake) in the mud stack area, while at the same time recovering their soda and alumina values.
  • Removing and destroying organic compounds and carbonate from Bayer Plant Liquor without generating unpleasant odours in the exhaust gases.
  • Improving alumina quality by consuming alumina/hydrate fines as a feed component.

This paper reports on the commissioning and start-up experiences of the Full-Scale, 120 MTD, SLC Demonstration Unit built at the Alumina Espanola facilities at San Ciprian (SPAIN).