Method for determining shape factor of particle swarm

Abstract

The invention provides a method for determining a shape factor of a particle swarm, comprising the following steps of: 1) establishing a particle swarm condensation liquid-solid reaction model; 2) determining grain diameter distribution of a solid particle swarm to realize mathematic expression; carrying out reaction with a liquid solution on the particle swarm under the conditions of constant temperature and constant solution concentration; weighing and determining a dissolving rate of the solid particle swarm; and fitting to realize the mathematic expression; 3) on the basis of the particle swarm condensation liquid-solid reaction model, utilizing measurement fitting data to calculate to obtain a comprehensive chemical reaction coefficient k and a change rule thereof of a liquid-solid two-phase chemical reaction; 4) when the shape factor phi of the particle swarm is about 1, carrying out experiment calculation to obtain the comprehensive chemical reaction coefficient k of the liquid-solid two-phase chemical reaction, namely a k0 value; and 5) calculating a specific value of the k value obtained by test calculation to a theoretical comprehensive chemical reaction coefficient k0 to obtain the value of the shape factor phi of the particle swarm. The determining method disclosed by the invention has the very important meanings on the mutual correlation of macroscopic experiment data and chemical reaction parameters aiming to the completion of a theoretical system of solid characteristics and a liquid-solid two-phase reaction.

Description

technical field [0001] The invention belongs to the field of solid particle characteristics and liquid-solid chemical reaction, and in particular relates to a method for measuring particle shape factor. Background technique [0002] Solid particles have relatively complex shape characteristics. In experimental research, they are generally treated as idealized spheres. The ratio of the real surface area of ​​solid particles to the surface area of ​​an idealized equal-volume equivalent sphere is defined as the shape of solid particles. The factor is of great significance for experimental research, but it is difficult to directly measure it through existing experimental methods. Liquid-solid two-phase chemical reaction is a very complex process, in addition to the chemical reaction process, it is also accompanied by the flow and mixing of reactants and the transfer of heat and mass. The former belongs to the problem of chemical reaction kinetics; the latter involves physical e...

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Problems solved by technology

However, the shape factor φ is difficult to be directly measured by existing experimental methods, so the measurement of the shape factor φ is

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