Slurry mixing is slightly out of my field but I see two aspects to the application. The first is securing a reliable feed system for the TiO2, because this is a poor flowing, cohesive powder that is difficult to dispense in a controlled manner, particularly at low, accurate rates.

The second task is to disperse the powder in the liquid. For such a duty I would suggest a Silversons high-shear mixer would probably be suitable. These are normally tank mounted and work by recirculating the liquor through a vortex via a rotating cylinder with bars or holes that run close to a fixed surface to impose intense shear and provide the pumping action to drive the system.



Taking the two issues together it may by easier to weigh a batch of TiO2 and feed this out with a screw feed that is not so demanding of accurate rate into a conrolled volume of water, rather that try to achieve an accurate short term feed.

Much may depend upon how the TiO2 is stored, what rate of slurry is required and whether a steady, continuous supply is needed. If you care to send more details direct to lyn@ajax.co.uk, I will try to assist further. ■

There are several well-known companies to solve your problems.

Please visit the following websites:

http://www.semibulk.com (ejector-mixer)

or

http://www.ystral.com (Conti-TDS-machine)

Best regards

Klaus Schneider ■

The air content of TiO2 can give rise to various problems of containment, density, packing and the like. It is slow to de-aerate due to the fineness of the particles, but this process can be accelerated by providing preferential air escape routes in a holding vessel, if these types of problems arise. You can see more about this techniques on the web site www.ajax.co.uk if of interest.

Lyn ■

We have a mixer that has been trised for making Titanium Dioxide. Please contact us by email and we can send you the brochures etc. www.saurin.com.au. The mixer is called Soliquid. ■