Continuous spouted bed process for sulphur-coating urea

Bobby S. E. Tsai
Sulphur-coated urea is a controlled-release, nitrogen fertilizer which has proven to be successful commercially. Current production technology used by Canadian Industries Ltd. and other firms is based on the Tennessee Valley Authority rotary drum process. This process is mechanically complex and the sulphur coated urea requires an additional wax coat to achieve the desired slow-release properties. By contrast, the spouted bed coating process developed at UBC promises to be mechanically simpler. Afer some initial difficulties,...
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