The process consists on two main different steps:
- 1st Granulation. Solid material is blended with binding agents in order to form a rounded compact granule by physical and chemical process. This is the most important step as it is needed to start the chemical reaction between binding agents that provoke the good conditions to make a good granulate in the narrowest range of particle size which avoid fines a coarses that stay in a recycling steady state. Parameters as particle size of raw materials, rotational rate of granulator or viscosity of binding agents are a key for good granulation.
- 2nd Drying. In this step the moisturised granulated mass is dried with hot air with a different thermal profile. Critical parameters in this step are particles size distribution on feeding and thermal profile.
The plant is controlled by several nodes of a DCS equipment from Emerson, Delta V.