Implementation of Semtech optical spectrometry system at Lonmin for converter Fe end-point control

摘要

Lonmin did an evaluation of the impact of Fe in converter matte that is processed at the Base Metal Refinery (BMR). Most of the evaluation was done with thermodynamic equilibrium modeling software (FactSage) and validation of the data was done with actual plant data and experience. The quality of the matte (from a BMR perspective), environment and safety considerations and the impact on costs at the smelter were evaluated. Different methodologies of end-point control in the converter are discussed and the choice of optical spectroscopy is explained. Optical spectroscopy as a tool to determine the oxidation state in a converter is well established in the Cu industry and is gaining acceptance in the Ni/ PGM industry. Results achieved after implementation is presented and the current focus/ development areas are listed, specifically around the manner in which the converters at Lonmin finishes the blow before granulation.