Sorting and grading device of pulsating liquid-solid fluidized bed and method thereof

Abstract

The invention provides a sorting and grading device of a pulsating liquid-solid fluidized bed and a method thereof. The sorting and grading device comprises a light product overflow trough, a central feed pipe, a sorting tank, a pulsating liquid distributor, a pulsating current generator, a heavy product collecting base-cone section, a sensor for measuring the concentration of the heavy product layer, a programmable controller, a heavy product discharging fluidized chamber and an underflow discharging automatic control actuator. The method comprises the following steps: firstly, water is thrown into a sorting machine in a pulsating way by the pulsating current generator, to form an upward varying-accelerated pulsating-type ascending current; accordingly, low-density or fine-fraction materials can be subjected to upward accelerated movement under the action of the accelerated pulsating-type ascending current, thus achieving the overflow discharge of the low-density or fine-fraction materials as the light or fine-fraction products; and high-density or coarse-fraction materials can be settled downwards in the fluidized bed, thus achieving the discharge of the high-density or coarse-fraction materials as the heavy or coarse-fraction products. Accordingly, the process for sorting materials by density on the basis of pulsating fluidization or the process for grading materials by fraction on the basis of pulsating fluidization can be achieved. The device and method of the invention have the advantages of simple operation, low energy consumption, low sorting lower limit, wide fraction range, high sorting accuracy and high reliability.

Description

technical field [0001] The invention relates to a sorting and classifying device and method for a pulsating liquid-solid fluidized bed, which is especially suitable for sorting and classifying solid wastes such as coal slime, gasifier ash and other fine-grained minerals. Background technique [0002] In the field of fine-grained mineral separation and classification, there are mainly equipment and methods such as cyclones, spiral separators, shaking tables, and disturbed bed separators (ie TBS), but there are some shortcomings in small-diameter dense medium cyclones: The particle size of the medium is too fine, the preparation and recovery of the medium are difficult, and the cost is high, the pressure of the feeding material is high, the equipment wears seriously, and the power consumption is large. Disadvantages of spiral separators: high separation density, high ash content of clean coal, small processing capacity, high height, strict requirements on feed concentration, a...

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Problems solved by technology

[0002] In the field of fine-grained mineral separation and classification, there are mainly equipment and methods such as cyclones, spiral separators, shaking tables, and disturbed bed separators (ie TBS), but there are some shortcomings in small-diameter dense medium cyclones: The medium particle size is too fine, the medium preparation and recovery are difficult, and the cost is high, the feeding pressure is high, the equipment wears seriously, and the power consumption is large

Disadvantages of spiral separators: high separation density, high ash content of clean coal, small processing capacity, high height, strict requirements on feed concentration, difficult to control in industrial production

When the traditional disturbed bed separation technology is used for the separation of coarse coal slime, the particle size range of the feed material is required to be narrow. When the particle size range of the feed material is wide, the adverse effect of particle size on the separation is very obvious. Low-density coarse ore particles It is easy to enter the high-density underflow. Although the recovery of low-density coarse ore particles can be strengthened by increasing the rising water velocity, the high rising water velocity will cause high-density fine particles to enter the overflow tank, resulting in The separation efficiency is reduced, and the underflow discharge port is particularly easy to block

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