CHANGING DIRECTION OF HYDRATE SEED REQUIREMENTS AT WORSLEY ALUMINA

Carnovale, A.R. and Kahane, R.B.

With the increasing drive for production and quality, many facets of the process have come under close scrutiny.
Engineering and production personnel alike are continually looking to increase throughput at minimal capital cost. In order to meet the constantly changing goals and constraints of the Seed Preparation and Filtration Facility, engineers have had to become increasingly innovative and flexible.

The hydrate seed preparation facility has undergone a number of major changes in bath operation and philosophy in the past five years. These production-driven initiatives have seen throughput capacity more than double, at a substantially reduced wash water per tonne of seed requirement.

Chemical additives have been used to assist in these developments and are now becoming an integral part of seed hydrate processing.

As one challenge is met, goals are redefined, with future direction involving further enhancement of the oxalate-rich wash filtrate stream.

This paper will detail some of the goals and achievements within the seed hydrate facility at Worsley and their resulting benefits.