| 摘要 |
PURPOSE: To provide a process and a device for producing an anhydrous, granular product of alkali sulfide by fluidized bed spray granulation, thereby non-generating dusts and having better heat exchange and exchange of materials. CONSTITUTION: The process comprises a step of drying hydrous alkali sulfide by fluidized bed spray granulation. The device for performing the process comprises a granulator chamber with a diameter-height ratio of 1:1 to 1:5, an atomizing device installed in the chamber for the melts, suspensions, dispersions or solutions, a feed device for fluidizing and drying medium, a discharge outlet located in the upper part of the chamber for the fine dusts or particles to be recycled, a solids separation system connected to the chamber via the discharge outlet and having an exhaust air pipe optionally fitted with a filter unit to remove the gas stream, a return system for the fine dusts and products to be recycled, which leads from the discharge outlet to the lower part of the chamber, an air separator located in the lower part of the chamber, a plant for recovering the solvent from the exhaust gas stream and a recycling and conditioning apparatus for at least partial recycling and conditioning of the exhaust gas for renewed use as the fluidizing gas.
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