Hot air drying device

The utility model discloses a hot air drying device belongs to pigment production technical field. Including bag - type dust collecting device, cyclone dust removal device, spray drying tower, the spray drying tower with cyclone dust removal device passes through first intercommunication of powder pipeline, cyclone dust removal device with bag - type dust collecting device passes through second intercommunication of powder pipeline. The utility model discloses novel structure has that spray drying tower, whirlwind remove dust, the pocket type removes dust three kinds of devices, uses through the cooperation of pipeline and valve between the device, can dry and collect to the powder collection device in the pigment thick liquids, receives whitewashed efficiently, the pigment thick liquids dry and subside in the drying tower through the spray drying tower, and remove dust and bag - type dust collecting device collects totally through the whirlwind again for the powder that can not subside, and the powder of dev