Spray drying slurry making

In a process used from 1937 to 1984, a solution of 10-15% hypochlorous acid, which contains very little chloride, is mixed with a slurry of hydrated lime at pH 10.0-10.5 to form a 15-20% solution of calcium hypochlorite. Sodium hypochlorite may be added to convert calcium chloride to calcium hypochlorite. The solution is spray dried, and the resulting solid is granulated and vacuum dried. Figure 24.7 depicts a current process, which uses salt-free 45-50% hypochlorous acid to make a slurry of hydrated calcium hypochlorite that is spray dried to make calcium hypochlorite with up to 82% available chlorine. The product may also be agglomerated. ... 

Spray drying involves pumping a slurry into hot air. The liquid trapped between particles in the slurry evaporates adiabatically, normally in a lot of air. Air flow can be concurrent, countercurrent, or a mixture of the two. The process is used to make dried milk, dried eggs, and dry grain. It is the basis of manufacturing instant coffee and laundry detergent. 

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