Fine particle hydraulic classification device and method based on vortex oblique flow

Abstract

The invention provides a fine particle hydraulic classification device and method based on vortex oblique flow. A plurality of oblique plates are distributed in a classification box of the device in the height direction, the adjacent oblique plates are arranged in a staggered manner, and the oblique plates and a classification box body jointly form a plurality of stages of classification spaces. The method comprises the steps that solid-liquid mixed flow is induced by the oblique plates in the classification spaces to form a vortex flow state based on the alternate oblique flow, the differenceof centrifugal force, shearing force, inertia force and fluid resistance borne by particles with different particle sizes in the solid-liquid mixed flow is enlarged, the difference of the movement track and space distribution of materials with different particle sizes is enhanced, and fine classification is achieved; primary oblique flow on the lower surfaces of the oblique plates is used for increasing the hydraulic radius of the classification spaces, the Froude number is greatly increased while the Reynolds number is reduced, and stable hydraulic conditions are provided for particle separation; secondary oblique flow on the upper surfaces of the oblique plates is used for reducing the hydraulic radius of the classification spaces, the Froude number is reduced while the Reynolds numberis increased, and momentum is provided for secondary circulation; and finally, material products with multiple particle sizes are separated out.

Description

technical field [0001] The invention belongs to the technical field of hydraulic classification, in particular to a fine particle hydraulic classification device and method based on vortex oblique flow. Background technique [0002] In the composite force field, the particles are graded by using the different particle size properties. This technology has been widely used in many fields such as chemical industry, metallurgy, mineral processing, pharmaceuticals, and wastewater treatment. 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, wate...

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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