Device and method for improving filtering capacity of INBA rotary drum for dealing with foam slags

Abstract

The invention provides a device and method for improving the filtering capacity of an INBA rotary drum for dealing with foam slags. The device involves the rotary drum, wherein a distributor is arranged in the rotary drum, a buffer tank is fixed to the lower portion of the distributor, a bottom plate of the buffer tank is gradually inclined from top to bottom, and the inclination direction of thebottom plate is consistent with the rotation direction of the drum body, below the bottom plate, of the rotary drum. According to the device and method, slurry flows into one side of the rotary drum after being guided by the buffer tank, and due to the fact that the bottom plate of the buffer tank is gradually inclined from top to bottom, in the rotary lifting stage of the rotary drum, water flowsback to the lowest point of the rotary drum, and water granulated slag is followingly lifted by the combination of a slag lifting net and a filter screen so that the water and the slag can be quicklyseparated, and the overflow phenomenon is avoided.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a device and method for improving the ability of an INBA drum to filter foam slag. Background technique [0002] Blast furnace ironmaking is an important by-product of ironmaking production, and water slag granulated by water quenching is a high-quality raw material for cement production. In the prior art, the processing device for the INBA method includes a brewing box, a water slag ditch, a water slag tank, a connecting pipe, a distributor, a drum filter, a belt conveyor in a cylinder and a transfer belt conveyor, a water collecting funnel, a hot water pool, a cooling Pumps, cooling towers and ancillary facilities, and slag flushing pumps are connected at one time. When flushing slag, the blast furnace slag flows into the punching box from the slag ditch, and is quenched into water slag by the high-pressure water jetted from the punching box, and enters the wa...

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Problems solved by technology

[0003] The problem existing in the INBA method of processing slag in the prior art is that the suspension is placed on one side of the filter medium, and at the beginning of the filtration operation, some small particles will enter the pores of the medium and may pass through the pores without being trapped. the filtrate is still cloudy

[0004] At the same time, a large amount of powdery slag is produced. The powdery particle size is small but the density is high. During the filtration process, the filter cake formed by the powdery particles is small, resulting in an increase in water flow resistance and a sharp drop in filtration rate. Due to the upstream slag The water mixture continuously enters the drum. When the filter channel becomes smaller and blocked, the filtrate cannot be discharged smoothly, causing the liquid level inside the drum to rise continuously and form an overflow. The light spongy foam slag particles floating on the surface of the filtrate It flows out with the overflow process; when foamy slag is encountered in the production process, the front and rear overflow of the drum is often caused by the poor filtering ability of the drum, resulting in a large amount of slag accumulation on site, and when there is foamy slag, the drum speed is usually faster, The high water content of the water slag falling into the belt makes the belt transportation difficult. Due to the overflow and serious water slag carrying water, the water consumption of the system is too fast, and in severe cases, it cannot be produced.

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