CAN COMPLEX HYDROMETALLURGICAL PILOT PLANTS EFFECTIVELY REDUCE PROJECT RISKS? PART ONE: KEY METALLURGICAL AND TECHNICAL MANAGEMENT ISSUES

摘要

Pilot plant metallurgical testing is commonly included in feasibility studies with the intent to limit the risks associated with the commercial implementation of mining projects. Still, metallurgical problems are among the main causes leading to disappointing project outcome. The most serious difficulties often arise in the case of projects involving difficult ores, generally requiring novel and/or complex flowsheets. The paper discusses pilot plant practices proven to be effective in producing metallurgical test data of sufficient reliability to effectively minimise metallurgical project risks. The causes and remedies of poor metallurgical performance at the pilot plant level are also discussed. Broader technical management issues covered include design, construction and operation of complex hydrometallurgical pilot plants. Particular emphasis is placed on pilot plant operations with respect to their preparation, management, design, operation and most importantly, overlooked metallurgical issues. Piloting experiences discussed include flowsheets treating polymetallic feed samples containing nickel, cobalt, copper and gold as pay metals.