Dense-medium dry separation equipment

Abstract

The invention discloses a dense-medium dry separation equipment, which comprises a fluidized bed, a tank body, a material guiding and propelling device, an air distribution device, a scraper conveying device and a material taking and screening device, wherein the fluidized bed is used for separating materials; the tank body is used for providing a space and installation equipment for forming of the fluidized bed; the material guiding and propelling device is used for guiding the materials into the fluidized bed along the side end of the fluidized bed to be loosened and layered and propelling the materials to move forwards; according to the air distribution device, compressed air passes through an air distribution plate to acquire pressure difference and is then conveyed into the fluidized bed to be sufficiently, evenly and stably fluidized, and clean coal, middings coal and gangue are separated in an optimal manner; the scraper conveying device is a large-scale scraper conveying device for the dry separation equipment, an anti-deformation measure is adopted by scrapers in order to prevent wider scraper components from deforming, and the separated gangue and middings coal are discharged from the scrapers; and after the materials pass through the separating fluidized bed, the clean coal is taken out from the material taking and screening device at the fluidized bed side, and dense media are screened out and return to the fluidized bed in the material taking process. The dense-medium dry separation equipment disclosed by the invention can overcome the defect of incapability of fluidizing and separating caused by blockage of an air outlet.

Description

technical field [0001] The invention relates to sorting equipment for ore dressing, coal dressing, building materials and chemical industry, in particular to a sorting equipment using air-dense medium dry sorting. Background technique [0002] Among the coal preparation technologies, the air-dense medium dry separation technology has received extensive attention from all over the world because it can be effectively used in arid and water-short regions. Our country is rich in primary energy reserves. Many water-deficient and arid regions in the world and the western and northwestern regions of my country especially need dry coal preparation technology. Lignite is not suitable for wet separation due to its short coal-forming time and high degree of mudification, and it needs dry separation. coal technology. Dense medium dry coal preparation mainly uses the difference in physical properties between coal and gangue for separation. In industrial production, there are wind coal pr...

AI Technical Summary

Problems solved by technology

2. The feed particle size of the old prototype machine is 6-50mm, and the feed particle size range is small. Due to the high moisture content of fine-grained coal below 6mm is very difficult to sieve, the lower limit rate is high, and the fine-grained materials are mixed into the fluidized bed to deteriorate the separation. The selection effect is easy to cause blockage of the air outlet of the air distribution plate

3. The old prototype is fed from a single point in the middle of the sorting machine. The material is easy to float on the fluidized bed and it is difficult to loosen the upper layer. The normal sorting work can only be carried out when the fluidized bed enters the fluidized bed evenly and fully in contact with the fluidized bed. If the feeding is not uniform, it is easy to cause the sorted materials to be mixed with the feeding materials again and destroy the sorting effect.

4. The height of the fluidized bed of the old prototype is 350-400mm, which belongs to the shallow bed separation. The gangue and clean coal are easy to contaminate each other, the separation accuracy is low, and the stability of the bed layer is difficult to guarantee when the fluidized bed is working.

6. The scraper part of the old prototype adopts 45 # Steel material, the width of the scraper part is 2000mm, the thickness is 60mm, and the height is 120mm. The scraper is heavy and wears heavily on the air distribution plate. The wider part of the scraper affects the fluidization of the upper part, and the rigid deformation of the scraper has not been solved.

[0003] At present, there is no precedent in the world where air-dense medium fluidized bed dry coal preparation technology has been maturely operated in an industrial system, and there is no large-scale air dense medium fluidized bed dry coal preparation plant that can meet the needs of the market. application

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