A device and method for fine particle hydraulic classification based on vortex oblique flow

Abstract

A fine particle hydraulic classification device and method based on vortex oblique flow. In the classification box of the device, several inclined plates are distributed along the height direction, and the adjacent inclined plates are arranged in a staggered manner. These inclined plates and the classification box body are jointly composed Several levels of sorting space. The method is: the solid-liquid mixed flow is induced by the inclined plate in the sorting space to form a vortex flow state based on alternating oblique flow, which is used to expand the centrifugal force, shear force, and inertial force on the particles of different sizes in the solid-liquid mixed flow. , the difference in fluid resistance, strengthen the difference in the movement trajectory and spatial distribution of materials with different particle sizes to achieve fine classification; the primary oblique flow on the lower surface of the inclined plate is used to increase the hydraulic radius of the sorting space, reduce the Reynolds number and greatly increase the Frau The German number provides stable hydraulic conditions for particle separation; the secondary oblique flow on the upper surface of the inclined plate is used to reduce the hydraulic radius of the sorting space, increase the Reynolds number while reducing the Froude number, and provide momentum for the secondary cycle; Finally, the material products of various particle sizes are separated.

Description

Technical field [0001] The present invention belongs to the field of hydraulic grading technology, and more particularly to a fine particulate water force grading apparatus and method based on a vortex slope. Background technique [0002] The particles are classified by different particle granular properties in the composite field, which has been widely used in various fields such as chemical, metallurgy, mineral processing, pharmaceutical, wastewater treatment. With the continuous improvement and development of classification technology, the fine grading of fine particles is also increasing, especially fine particles having a particle size of 100 um, in its solid-liquid mixing phase, due to different particle size particles, fluid resistance , The degree of inertial force is small, the movement trajectory of different particle size particles is similar, at this time, the routine cyclone, the vibrating screen, the concentrator, and the analyzer will not meet the grading processin...

AI Technical Summary

Problems solved by technology

With the continuous progress and development of classification technology, the demand for fine classification of fine particles is also increasing, especially for fine particles with a particle size below 100um. In its solid-liquid mixed phase, due to the centrifugal force and fluid resistance , The degree of inertial force differentiation is small, and the trajectory of particles with different particle sizes is similar. At this time, conventional cyclones, vibrating screens, thickeners, water analyzers and other classification equipment will not be able to meet the needs of fine particle classification, and these conventional classification The equipment generally has problems such as poor particle size applicability, low classification accuracy, high energy consumption, low classification efficiency, complex equipment structure, and high production and processing costs.

Therefore, only by enhancing the difference between the centrifugal force, shear force, fluid resistance, inertial force and other forces on the particles in the composite force field, can the classification ability of the particles be improved, but there are still some problems that can meet the requirements. Hydraulic grading equipment for the above technical requirements

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