Spray driers are used for converting slurrier into fine droplets by spraying the material into a stream of hot gases. The slurry is pumped through an orifice at high pressure or through a high speed perforated rotating disc. The droplets are brought into contact with hot air and are converted to dry powder or granules used for drying of Detergents, Polymers, Dyestuff, Food, Ceramic, Chemicals etc.