Authors: M. Pearson, S.Sullivan, Lakeside Process Controls
ISA Expo 2008
Abstract
Autoclave processes are increasingly being used for pressure oxidation and pressure leaching in the mining industry because they offer the most economic method of base metal extraction while minimizing emissions. Yet high pressure processes introduce new safety concerns and risks as demonstrated by the explosion at the Kaiser Alumina plant in Gramercy, Louisiana on July 5, 1999 that injured more than two dozen workers and
leveled major portions of the plant. Mining companies operating autoclave processes should perform a rigorous hazard and risk analysis based on ANSI/ISA-84.00.01 (IEC 61511) safety standards to decide on the right level of protection required for each hazard in the plant. Until recently, users had little choice but to use completely separate systems for control and safety of autoclave processes. Today, utilization of a tightly Integrated Control and Safety System (ICSS) has become a cost effective method for ensuring the safe operation of autoclave processes.
