
process requirements of the refinery, in terms of zinc grade, gangue acid consumption and deleterious elements that may impact on the efficiency and costs of the metallurgical process. 3. THE GRADE CONTROL PROCESS A complex system is in place that is Jan 01, 2007 PROCESS CONTROL IN METALLURGICAL PLANTS FROM AN XSTRATA* PERSPECTIVE Philip Thwaites P.Eng. Xstrata Process Support (XPS)** XPS Centre, Falconbridge, Ontario, Canada. (email protected) Abstract Some history and modern practice of Process Control in metallurgical operations is reviewed. Clearly the early deliverables from the pioneer days ...