Titanium dioxide (TiO2) is a white color pigment that can effectively scatter light due to its refractive index and therefore produces a well-covering white color. Titanium dioxide is produced worldwide on a million-ton scale. Most of the titanium dioxide production is used in technical applications such as the manufacture of paints, varnishes, paper and plastics.
One variant of the production of titanium dioxide is the sulphate process. This method consists of several processes. Before the chemical conversion to the white TiO2 pigment is complete, the product must be calcined. Before calcination, the product already has approximately the desired top cut size. Calcination at very high temperatures removes water from the product and large, sometimes hard agglomerates are formed from the small primary particles. These agglomerates must be deagglomerated and dispersed back into the primary particles in the pendulum mill by mechanical stresses of pressure and shearing.
With TiO2 grinding in particular, only a very thin bed/film of ground material forms between the grinding roller and grinding ring in the pendulum mill. The NEUMAN & ESSER Pendulum Mill (PM) is designed precisely for this type of grinding:
