Method for improving particle fluidization quality and separation density stability and matched device

Abstract

The invention discloses a method for improving particle fluidization quality and separation density stability and a matched device. In a gas-solid fluidized bed dry separation system, coarse particlesand fine particles are selected as separation media, the coarse particles and the fine particles are sufficiently mixed, a separation bed layer having a certain density is formed under the action ofairflow, the size of the coarse particles is not larger than 500 microns, the size of the fine particles is not larger than 45 microns, and the aerodynamic diameter ratio of the coarse particles to the fine particles is not less than 5. The matched device comprises a gas-solid fluidized bed body, a wind supply device, a material level height testing device, a scraper conveyor device, a density measuring device and a dust removing device. According to the method and the matched device, the fine particles are introduced, so that the fluidization quality of the medium particles is improved, the bubble size is reduced, the separation density stability is improved, the mineral separation accuracy is improved, and efficient separation of coal is achieved. The device does not need water, is simple in operation and maintenance, free of pollution and low in investment and operation cost, and has significant economic and social benefits.

Description

technical field [0001] The invention relates to a mineral processing method, which belongs to the technical field of dry mineral separation, in particular to a method and a supporting device for improving particle fluidization quality and separation density stability. Background technique [0002] Coal sorting and processing is an indispensable and important link in the process of coal production and efficient utilization, and is the basis and premise for realizing clean coal utilization, energy conservation and emission reduction, and sustainable and healthy development. my country's coal separation technology is still dominated by wet separation, and the separation process consumes a lot of water resources. In addition, my country's lignite resources are abundant, and it is difficult to adopt traditional wet technology due to its easy slime characteristics. Therefore, the development of dry separation technology is of great significance to reduce water consumption and imp...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method and supporting device for improving the fluidization quality of particles and the stability of sorting density, select coarse particles and fine particles as the sorting medium, and through the introduction of fine particles, effectively Reducing the average particle size of the particles in the fluidized bed can improve the fluidization performance of coarse particles; the particle size is reduced, and the particles show the characteristics of uniform dispersion expansion, which helps to improve the expansion of the emulsified phase; the size of the bubbles increases with the particle size The reduction also shows a decreasing trend, increasing the overall expansion height of the bed, reducing the fluctuation of the separation density, helping to improve the stability of the separation density, and solving the problem of the stability of the separation density in the existing gas-solid fluidized bed beneficiation. Difficulties in sorting low-resistance and fine-grained minerals

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