Method for measuring solid diffusion rate and dissolution rate in solid-liquid mixing process

Abstract

The invention discloses a method for measuring a solid diffusion rate and a dissolution rate in a solid-liquid mixing process, which comprises the following steps: S1, building an experiment table: adding a solid-liquid phase to be mixed into a transparent container, stirring and mixing, and collecting a video image in the solid-liquid phase mixing process; S2, processing the collected video image to obtain a binary image sequence; S3, calculating a fractal dimension time sequence based on the binary image sequence, and solving the dissolution rate of the solid in the liquid based on the time sequence; and S4, obtaining a P value of the binary image sequence, the P value being an absolute value of the slope of the fractal dimension obtained by continuously corroding each binary image for a plurality of times, fitting the P value by utilizing logistic regression, obtaining a moment when the diffusion range is maximum, and obtaining the solid diffusion rate based on the moment when the diffusion range is maximum. According to the invention, the solid diffusion rate and the dissolution rate in the solid-liquid mixing process can be measured in a non-invasive, intuitive and accurate manner.

Description

technical field [0001] The invention relates to the technical fields of chemical engineering and hydrometallurgy engineering, in particular to a method for measuring solid diffusion rate and dissolution rate in a solid-liquid mixing process. Background technique [0002] The gas-liquid-solid three-phase system is a very common multiphase flow reaction or separation system in industrial production processes, and it is widely used in many industrial processes such as petroleum, chemical industry, energy and metallurgy. Intensified agitation and mixing is a key step in many process technologies. In chemical reactions, intensified agitation and mixing is to speed up the reaction process and save reaction time; in physical reactions, intensified mixing is to prevent the deposition of solid particles and achieve Suspended state, reducing mixing energy consumption. Mastering the effect of multi-phase mixing can accurately control the mixing process and save a lot of manpower, mate...

AI Technical Summary

Problems solved by technology

Although some scholars have studied the transient tracer distribution, concentration change and macroscopic mixing characteristics in the stirred tank through the PLIF measurement method, the application of this method has strong limitations, and the requirements for the selection of working fluid are relatively high.

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