ROBOTIC AUTOMATION OF THE FIRE ASSAY PROCESS FOR RAPID QUANTITATIVE MEASUREMENT OF PLATINUM GROUP ELEMENTS IN MINERAL CONCENTRATOR PLANTS

摘要

The fire assay process for the quantitative recovery of platinum group elements (PGE's) prior to subsequent analysis traditionally is a time-consuming process. Samples derive from various ore types and contain PGE's at the ppm or ppb levels, making concentration of the elements mandatory before assaying. Traditionally sample turn-around times are of the order of 24 hours. The whole sequence of sample preparation, fire assay and subsequent analysis of PGE's have been automated by Anglo Platinum. Some of the major challenges on the road to automation will be discussed and the novel solutions that were implemented. The engineered solution included robotic automation of the whole sequence, from sample preparation, up to the final element by element assay. The final system allowed for rapid (less than one hour) and accurate analysis of PGE's even in streams containing very low levels, such as flotation tailing streams and drill core samples.