A kind of dense medium dry separation equipment

Abstract

The invention discloses a heavy medium dry separation equipment. The equipment includes: a fluidized bed, which is used for material sorting; a box body, which is used for providing space for forming the fluidized bed and installation equipment; a material guiding and propulsion device, After the material is introduced into the fluidized bed through the device along the side of the fluidized bed, the material is loosened, layered and pushed forward; The bed is fully fluidized, uniform and stable, and the best separation effect of clean coal, medium coal and gangue is obtained; scraper transport device, a large scraper transport device for dry separation equipment Deformation, the scraper adopts anti-deformation measures, and the sorted gangue and medium coal are discharged from the scraper; the reclaiming and screening device, after the material passes through the separation fluidized bed, the clean coal is taken from the side of the fluidized bed. Take out, the heavy medium is screened out and returned to the fluidized bed during the reclaiming process. The device of the invention can avoid the problems of incapability of fluidization and separation caused by the blockage of the 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 feeding particle size of the old prototype machine is 6-50mm, and the feeding particle size range is small. Because the fine-grained coal with high moisture content below 6mm is very difficult to screen, 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.

12. The old prototype has no design process control for the moisture in the feed. Practice has proved that the moisture in the raw coal feed and the moisture in the medium have a great impact on the normal operation of the fluidized bed. Air dense medium fluidized bed dry coal preparation technology and separation equipment Incoming moisture must be controlled to be successful in industrial applications

[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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