Optimizing Feed System Performance in Rio Tinto Kennecott Flash Smelting: Challenges and Solutions

The chapter delves into the challenges faced by the Rio Tinto Kennecott Smelter in maintaining uniform heat loads and consistent material distribution in its flash smelting furnace. It highlights the issues of uneven refractory wear and accretion patterns, which were linked to the original feed system design. The text details the significant upgrades implemented during the July 2024 shutdown, including the installation of a new feed bin chute, Metso-style air slide, feed inlet chute, and Metso Octaburner disperser. These upgrades aimed to improve feed distribution and air delivery, leading to more uniform temperature profiles and reduced refractory wear. The chapter also discusses the post-startup challenges encountered, such as frequent acid plant trips and the resulting increase in plenum backpressure. Solutions to these issues, including plenum modifications and blower upgrades, are explored in detail. The performance evaluation section presents data on reaction shaft skin temperatures, feed inlet thermocouples, and copper content in slag, demonstrating the improvements achieved through the upgrades. Regular internal inspections confirmed the positive impact of the new components on furnace performance. The chapter concludes with a summary of the operational improvements and recommendations for further refinements to ensure long-term stability and efficiency in the flash smelting process.