Method for testing retention time of materials in cement mill based on image recognition technology

The invention discloses a method for testing residence time of materials in a cement mill based on an image recognition technology, and belongs to the technical field of cement production. The method comprises four procedures, namely, fluorescein material cake sample preparation, fluorescein feeding and taking, fluorescein image acquisition and fluorescein image recognition and quantification. The retention time of the materials in the cement mill can be rapidly and accurately tested. A plastic material cake is prepared by adding water into fluorescein powder and the mill entering materials, the fluorescent powder is prevented from being quickly blown to the tail of the mill along with ventilation in the mill to influence a test result, fluorescein recognition adopts an image recognition method, a shooting task can be completed only by using a portable handheld microscope with a low price, shooting of each sample only needs 3-4 minutes, the shooting of all the samples only needs one hour; and by using a compu