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As an eco-friendlier way to manage mining waste, the use of solar energy to dry phosphate sludge in a rotary dryer is envisioned. As a first step toward this end, a design study for a bench-scale rotary dryer for phosphate sludge is detailed, using a one-dimensional mathematical model developed for this task. Using the Engineering Equation Solver (EES) software, a steady-state transport phenomena model was developed that enables an estimation of the moisture and temperature profiles for bothdoi:10.1155/2022/5574242 doaj:fbed249ed57349328c8356594cdd6183 fatcat:xjhjbhoyxbeardys445fhzvmsi