Coal slime rotational flow reselecting column

Abstract

The invention relates to a coal slime rotational flow reselecting column, which comprises components of a cylinder (4) of the coal slime rotational flow reselecting column, a feeding pipe (3) tangentially arranged on the upper part of the cylinder (4), an overflow pipe arranged in the cylinder (4) and coaxial with the cylinder (4), and a cone (6) hermetically and fixedly connected with the lower end of the cylinder (4) through a connecting flange (11), wherein the center of the lower part of the cone (6) is provided with a round underflow opening (13), the cone (6) at the lower end of the cylinder (4) is arranged as a reverse composite-cone hydraulic jump structure (12), and the cone (6) of the reverse composite-cone hydraulic jump structure (12) is designed into a positive-negative-positive cone shape. The coal slime rotational flow reselecting column introduces a hydraulic jump into a deep water layer gravity separation process, uses a vortex generated by the hydraulic jump between the jump head and the jump tail to improve the diffused pressure among fine grain bed layers and enhance the loosening and the separation layering of the bed layers, and makes use of the concentric rotation upward flow of the rear section of the hydraulic jump to achieve the conveying separation of layered materials and improve the separation accuracy and the separation efficiency.

Description

technical field [0001] The invention belongs to fine-grained coal separation equipment, and mainly relates to a coal slime gravity separation device, in particular to a coal slime cyclone gravity separation column. Background technique [0002] With the improvement of coal mechanized mining, the fine-grained content of raw coal gradually increases. With the deepening of mining depth and the increasingly demanding market for product quality, the selection of raw coal has become correspondingly difficult. However, there is still a certain gap between the existing fine-grained coal separation equipment and technology and the requirements of high-efficiency separation, and it is impossible to obtain high separation efficiency and resource recovery rate. [0003] At present, the commonly used fine-grained coal gravity separation equipment includes small-diameter dense medium cyclones, spiral separators, shaking tables, disturbing bed separators, and water medium cyclones. The d...

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Problems solved by technology

[0004] The patent No. 90201955.4 "Double inlet water medium cyclone group for coal preparation" uses a single-section cone structure for the water medium cyclone, and the separation accuracy is low. Although the depth of the overflow pipe inserted into the cylinder can be adjusted , but the adjustment screw and other devices are located inside the liquid flow and are easy to wear

Nikkam Surish mentioned in "miningmagazine" (No. 3, pp. 266-268, 1990) that the cone section of the composite water medium cyclone is divided into three sections, but the direction of the three-section cone is the same and the angle of the generatrix of the cone section is from the top It decreases successively from bottom to bottom. It has been proved by experiments that this type of composite cyclone is easy to lose coarse-grained and low-density materials when it is used for density separation.

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