Air impulsive motion dense medium fluidized bed and sorting method thereof

Abstract

The invention discloses an air pulse dense-medium fluidized bed and a separation method therefore, which belongs to the field of dry-process mineral processing and is particularly suitable for dry-process coal preparation. The air pulse dense-medium fluidized bed and the separation method therefore comprise the prior air dense-medium fluidized-bed and the separation method thereof, and are characterized in that the upflow for the fluidization of a dense-medium bed is kept to be unsteady airflow that alternately changes in a period according to a certain law. When the fluidized bed and the separation method are adopted for separation, the aim that the fluidized bed is stable, easy to control, high in reliability, good in effects, capability of popularization and wide in adaptation range can be achieved, and the effects that can not be achieved by the prior air dense-medium fluidized-bed and the separation method thereof can be achieved. The method is a novel dry-process separation method in the mineral processing industry.

Description

Technical field [0001] The invention relates to a beneficiation method, in particular to an air pulsating dense medium fluidized bed and a separation method thereof. Background technique [0002] At present, the air-dense medium fluidized bed and its separation method disclosed at home and abroad, such as "A Gas-Solid Liquidized Bed Coal Separation Experimental Device and Separation Experimental Method" contained in U.S. Patent US4194917, and Chinese Patent ZL87101056 "Dry Fluidized Bed Coal Preparation Method and Device", Chinese Patent ZL921113102 "Large Air Dense Medium Fluidized Bed Separation Method and Device", Chinese Patent ZL961168919 "Double Density Layer Air Dense Medium Fluidization The method and device for three-product sorting by bed", the "vibration reverse split flow air heavy medium separator" contained in Chinese patent ZL942213912, etc., and " Dry Separation and Clean Coal, pages 164 to 117, pages 244 to 248, and pages 338 to 346, etc., are all mixed wit...

AI Technical Summary

Problems solved by technology

[0002] At present, the air-dense medium fluidized bed and its separation method disclosed at home and abroad, such as "A Gas-Solid Liquidized Bed Coal Separation Experimental Device and Separation Experimental Method" contained in U.S. Patent US4194917, and Chinese Patent ZL87101056 "Dry Fluidized Bed Coal Preparation Method and Device", Chinese Patent ZL921113102 "Large Air Dense Medium Fluidized Bed Separation Method and Device", Chinese Patent ZL961168919 "Double Density Layer Air Dense Medium Fluidization The method and device for three-product sorting by bed", the "vibration reverse split flow air heavy medium separator" contained in Chinese patent ZL942213912, etc., and " Dry Separation and Clean Coal, pages 164 to 117, pages 244 to 248, and pages 338 to 346, etc., are all mixed with fine particles in the ascending vertical airflow The solid phase adds heavy matter to form a gas-solid fluidized bed with a certain density (uniform and stable, with a corresponding volume concentration). After the separated minerals with different densities enter the fluidized bed, the light ones float up and the heavy ones sink , so as to achieve sorting. The upward vertical airflow mentioned in the work is continuous, and its wind pressure and air volume are kept stable, which is relatively constant. This method has been proved to have the following problems through production and use: ① The air holes are required to be thin and If the sieve plate is dense, it is too difficult to process the sieve plate; ②The air holes on the sieve plate are too small and easy to be blocked; ③There is interference in the fluidized bed, which is easy to generate air bubbles; The fluidized state is partially unstable; ⑤ bed fluidization with or without coal, with more or less coal, the required air pressure is different, it is difficult to control, and it is difficult to maintain an ideal fluidized state; ⑥ When using a scraper In the equipment for collecting materials, the running scraper and piles of moving materials make it more difficult to maintain a stable fluidized state of the bed

Because these problems are not easy to solve, it affects the popularization and use of this technology