Maximize yield, minimize downtime

In HPAL processes, ore is crushed, mixed with water to form a slurry, and pumped into autoclaves where sulfuric acid initiates a chemical reaction at temperatures above 260 °C and pressures exceeding 33 bar. Precise temperature control is vital to optimize leaching efficiency, manage iron hydrolysis, and ensure safe operation.
However, slurry viscosity varies during heating, making accurate temperature measurement difficult. Conventional sensors often fail to respond quickly or withstand the harsh environment, leading to inefficiencies, safety risks, and reduced metal recovery.

To meet the demanding requirements of temperature measurement in HPAL autoclaves, Endress+Hauser provides a robust and modular solution centered around the iTHERM ModuLine TM151. This industrial thermometer is equipped with a QuickSleeve RTD sensor that ensures fast response times, enabling precise detection of temperature changes within the slurry. Its barstock thermowell is designed to withstand the extreme pressure and corrosive conditions typical of high-pressure acid leaching, significantly extending the sensor’s lifespan and reducing maintenance needs. The temperature signal is transmitted via the iTEMP TMT72, a HART-compatible transmitter that ensures reliable communication with the control system. For operators who require on-site visualization, the solution can be complemented with the TID10 local display . It is also possible to visualize the process values directly on the customer’s mobile device using the SmartBlue-App. Together, these components form a temperature monitoring system that enhances process efficiency, improves safety, and supports consistent metal recovery in one of the most challenging environments in the mining industry.