New dispersing turbines for the preparation of concentrated suspensions

The performance of two new dispersing tools (Deflo and Sevin turbines) were tested for the preparation of highly pigmented solids slurries. Their powe r consumption and dispersing efficiency are compared against the performanc e of the classical Cowles sawtooth turbine. The experiments are carried out with kaolin clays at solid concentration up to 72 wt.%. The influence of p owder feeding rate on tile slurry preparation is also investigated. Althoug h the classical Cowles disperser is able to promote good slurry dispersion, the power consumption is significant due to the high rotational speed requ ired to maintain a sufficient circulation in the tank, The Deflo and Sevin turbines give the same results for the dispersion quality, but the power co nsumption is greater with the Deflo turbine, which makes tile Sevin impelle r a very promising technology for high solids slurry preparation.