Coal preparation process of graded desliming with pressure feeding three-product dense medium cyclone

Abstract

Provided is a classified-desliming pressurized-feeding three-product dense medium cyclone coal preparation process. The process comprises the steps that wet classification and primary desliming are carried out on raw coal after prescreening, gangue predischarging and breaking are carried out on the raw coal, secondary desliming is carried out on the screen underflow of the raw coal after the screen underflow is concentrated, the oversize products of the secondary desliming and the screen underflow of the primary desliming are together fed in a pressurized three-product cyclone, three products are obtained after separation, and clean coal, middle coal and gangue are obtained after medium separation and dehydration are carried out on the three products. Part of qualified suspension liquid and dilute suspension liquid are obtained when the medium separation is carried out on the three products, magnetic concentrate is obtained after the dilute suspension liquid is recovered by a magnetic separator, and the magnetic concentrate and the qualified suspension liquid are directly fed in a medium blending barrel. The magnetic tailings of the dilute suspension liquid and the undersize mixtures of pre-desliming, the overflow of concentration classifying equipment and a secondary desliming screen enter a coal slime recovery processing system together. The process is high in separation efficiency, flexible in product structure, low in producing and operating cost and prone to achieving the large-scale single system, the modularization and the integrating intellectualization of plant layout.

Description

technical field [0001] The invention relates to a raw coal separation process, in particular to a coal separation process for graded desliming and pressure-feeding three-product dense medium cyclone. Background technique [0002] At present, the coal preparation technology mainly adopted in foreign countries is: pre-selection desliming + two-product heavy medium cyclone main separation + two-product heavy medium cyclone re-selection + coal slime recovery process. This process has the disadvantages of complex system, inconvenient management and high construction investment. The main domestic coal preparation technologies are: no desliming full-stage selection of dense medium process and pre-selection desliming + non-pressurized heavy medium process + slime recovery process. These two processes all have the disadvantages of large workshop volume, high construction investment, and high production and operation costs. [0003] According to the characteristics of my country's e...

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Problems solved by technology

[0004] In order to meet the needs of building a large-scale intelligent, efficient and integrated coal preparation plant, the present invention addresses the problems of complex systems, inconvenient management, large plant volume, high construction investment, and high production and operation costs in the prior art.

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