Flaky mineral hydration film thickness measurement method

Abstract

The invention relates to a flaky mineral hydration film thickness measurement method. The technical scheme is characterized in that the method comprises the following steps: measuring average length a and average thickness c of flaky minerals by utilizing an atomic force scanning electron microscope; carrying out calculation to obtain average radius-thickness ratio R; carrying out calculation to obtain intrinsic viscosity f(R) according to a formula f(R)=16 / 15*(R / (tan<-1>R)) (shown in the description); measuring viscosity of flaky mineral pulps in different volume concentrations and viscosity of the pure water; carrying out calculation to obtain relative viscosity of the mineral pulps in different volume concentrations; drawing a scatter diagram with the volume concentration of the mineral pulp being served as a horizontal coordinate, and the elative viscosity being served as a vertical coordinate; controlling the intercept of the vertical coordinate to be 1 and carrying out linear fitting to obtain slope k of a fit line; and finally, substituting the k, c and f(R) into a formula h=c / 2[(k / f(R))-1] (shown in the description) to obtain the film thickness h of the flaky mineral hydration film. The method fills up the blank of thickness measurement of the flaky mineral hydration film.

Description

technical field [0001] The invention belongs to the technical field of mineral surface chemistry, and in particular relates to a method for measuring the thickness of a sheet mineral hydration film. Background technique [0002] When mineral particles are in water, water molecules will form an oriented arrangement near the surface, and this ordered boundary layer formed on the surface of mineral particles is called hydration film. In the process of mineral flotation, by enhancing the thickness of the hydration film on the surface of the particles and improving the hydration repulsion between the particles, the mineral particles are in a stable and dispersed state, thereby avoiding the mutual mixing of various minerals and the covering of slime. to achieve effective selective separation. The hydration film is also closely related to hydrophobic flocculation flotation. Hydrophobic flocculation requires the addition of chemicals to break the hydration film on the mineral surfa...

AI Technical Summary

Problems solved by technology

This method can only measure the sum of the thickness of the hydration film formed by the probe and the substrate. Since the flaky minerals cannot be used as the probe of the atomic force microscope, the hydration film of the flaky minerals cannot be measured by this method.

In the public doctoral dissertation (Liu Lingyun. Research on the surface hydration mechanism of kaolinite particles in coal slime water [D]. Huainan: Anhui University of Technology, 2013), the author measured the hydration parameter f of kaolinite particles based on the viscosity method , used to qualitatively reflect the thickness of the hydration film on the surface of the particle, but the hydration parameter f cannot reflect the actual thickness of the hydration film on the surface of the kaolinite particle

At present, the measurement of the thickness of the hydration film of flake minerals is still blank

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