Filtering device for slag-washing water of blast furnace

Abstract

The invention discloses a blast furnace slag flushing water filter device, which belongs to the technical field of blast furnace ironmaking and comprises a shell with a water inlet and a water outlet, the water inlet is arranged above the side of the shell, and the water outlet is arranged on the shell Below the side of the body, the top and bottom of the housing are also provided with a sewage outlet and a slag outlet respectively, and the water inlet is connected with the slag outlet to form a slag outlet channel: the slag outlet is connected with the water outlet to form a filter channel; the slag outlet It communicates with the sewage outlet to form a backwashing channel; a filter is arranged on the filtering channel; a backwashing device is arranged on the backwashing channel. The present invention separates heavier iron slag particles in the slag flushing water through centrifugal cyclone, and filters smaller slag cotton and suspended solids through a filter screen, that is, coarse filtration and fine filtration are realized in one device at the same time, and the filtration efficiency and quality are improved. , At the same time, the fully automatic online backwashing is realized through the backwashing device, which is simple and convenient to operate, and further improves the operation efficiency.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and relates to a blast furnace slag flushing water filter device. Background technique [0002] During the ironmaking process, coke is burned inside the blast furnace, which melts the iron ore and undergoes a reduction reaction to produce molten iron and blast furnace slag at a temperature of about 1450 °C. After the blast furnace slag and molten iron are separated, the molten iron enters the next production process such as steelmaking; blast furnace slag is the main by-product, which needs to flow out of the blast furnace and be processed. Slag is a good material for making cement. If the slag is not rapidly cooled by water washing, the waste like stone will be obtained. Therefore, iron and steel enterprises generally adopt the water flushing slag process to cool the 1450°C blast furnace slag. In the blast furnace slag flushing process, the slag flushing water absorbs the heat...

AI Technical Summary

Problems solved by technology

Because the blast furnace slag flushing water contains a large amount of slag particles with a large specific gravity and slag wool suspended matter with a density of less than 1000kg / m and a diameter of less than 5μm, after sedimentation, it enters the water absorption pool, and the suspended matter content is still as high as 80mg / L. In order to remove the slag wool Suspended solids are currently filtered by fiber bundle filters, while the existing fiber bundle filters can only partially intercept slag cotton, and some of them will pass through the filter layer of the fiber bundle filter and flow out of the filter with the water flow, which will Enter the heat exchanger of the next link, and accumulate on the heat exchange plate, affecting the heat exchange effect

In addition, when backwashing the filter after a period of use to restore its filtering function, the specific time and timing of backwashing need to be controlled by the operator based on experience, which often delays the best time for backwashing. Thus affecting the filtering effect and service life of the filter

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