Computational Analysis and Commercial Demonstration of Improved Pressure Leach Vessel Agitator Design

摘要

Typicalpressurized leaching configurations involve a multi-chamber horizontal tank with either dished or semi-elliptical heads. Agitation systems for gas-liquid mass-transfer processes such as copper; uranium, etc. generally consist of dual pitched blade turbine (PBT) systems, a radial disc turbine (Rushton Turbine) at the lower position, or some combination of turbine systems. This type of technology is well known to have limited processing capabilities, particularly in mass transfer of gas through the liquid phase and into contact with the solid surface. Brick or liner erosion may also be an issue in the discharge regions off both the PBT and Rushton Turbine. Solid suspension and blending are far from ideal due to imperfect flow distribution, particularly in the knuckle regions of the first and last stages. However, the critical aspect for design and area of largest concern with the industry standard mixer systems is in obtaining sufficient mass transfer. PBT/Rushton systems require a compromise solution in terms of impeller locations to accomplish even moderate headspace gas reincorporation.