Method and device for recovering residual material and collecting dust at alumina unloading station

Abstract

The invention relates to a method and an apparatus for recovery of remaining alumina and dust collection in alumina discharge stations. According to the invention, a negative pressure dust collection system and a fixed type design are employed; main equipment is installed in a central material knockout platform of a discharge station; power for negative pressure is generated by a Roots pump; a gathered material obtained through a material gathering nozzle is conveyed by a wear resistant flexible pipe and a wear resistant pipe network and subjected to three-stage separation of interception by a material storing bunker, separation by a cyclone dust collector and separation by a bag filler; recovered alumina is screened by a flap sieve and returned to a railway alumina tank car which is empty or half-empty after material knockout; and an alumina discharge station dilute phase system is used to convey the recovered alumina to an alumina storing bunker. The advantages of the invention are as follows: the problems of multi-time turning of vehicles, multi-time rising of alumina and incapability of removing impurities in stained alumina on the floor existing in manual digging and manual sweeping of alumina are overcome; valuable resources are recovered; waste is reduced; labor intensity of workers are mitigated; working environment is improved; working efficiency is enhanced; clean production is realized. Therefore, the apparatus provided is applicable to electrolytic aluminum factories, alumina factories, alumina loading and unloading stations and harbors.

Description

1. Technical field [0001] The invention relates to a method and device for recovering residual material and collecting dust at an alumina unloading station, and belongs to the technical field of material negative pressure recovery. 2. Background technology [0002] In 2010, the annual alumina production capacity of the domestic aluminum industry reached 21 million tons, while the annual import of alumina was 4.5 million tons; 60% of which was transported to electrolytic aluminum plants by railway alumina tank cars. After the railway alumina tank car arrives at the alumina unloading station of the electrolytic aluminum plant, the alumina powder in the tank car is transported to the alumina storage bin by means of dilute phase transportation. Due to the limitation of the design of the fluidized bed at the bottom of the railway alumina tank car, after the alumina powder is conveyed in dilute phase, there is some residual material in the alumina tank car, ranging from 300-500 kg...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to make full use of the existing conditions of the alumina unloading station to provide a method and device for alumina recovery and dust collection at the alumina unloading station of the aluminum industry to solve the multiple problems of manual digging and manual cleaning. Recycling valuable resources, reducing waste, reducing labor intensity of workers, improving working environment, improving labor efficiency, and realizing clean production

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