Project Description

High Pressure Acid Leaching (HPAL) autoclave leaching is an effective method to recover Nickel laterite ores.  HPAL is a demanding process with slurry temperatures above 250°C and pressures above 55 atm.  REXA Linear and Rotary Actuators are used to control slurry feed inlet and discharge isolation valves at the autoclave, preheaters, and acid stripper.  Large torque outputs in a small package and actuator reliability are important to HPAL operational safety and uptime.


  • Reliable on/off control
  • Large torque output
  • Motor or accumulator driven
  • Withstands harsh, wet and humid atmospheric conditions