Process for drying high-lactose aqueous fluids

A method of concentrating whey permeate;

• the method comprising the steps of:
• introducing whey permeate that comprises at least about 70% solids, including at least about 50% lactose into a cooling, concentrating, crystallizing apparatus in which the whey permeate is exposed to a gaseous fluid effective to create a cooling, concentrating, crystallizing cascade which utilizes the heat of crystallization from the crystallization of lactose within the whey permeate to drive the cooling, concentrating, crystallizing cascade forward to generate an aqueous fluid that comprises at least about 78% total solids and has an equilibrium of lactose in solution and lactose in crystalline form;
• and
• spraying the aqueous fluid into a chamber containing hot air to form a high-solids crystalline product rich in crystalline lactose.