Filtering device for slag-washing water of blast furnace

Abstract

The invention discloses a filtering device for slag-washing water of a blast furnace, belonging to the technical field of the blast furnace ironmaking. The filtering device for slag-washing water of blast furnace comprises a shell with a water inlet and a water outlet, wherein the water inlet is formed at the lateral upward side of the shell, the water outlet is formed at the lateral down side of the shell, a sewage draining outlet and a slag hole are formed at the top part and the bottom part of the shell respectively, the water inlet and the water outlet are communicated to form a deslagging channel, the slag hole is communicated with the water outlet to form a filtering channel, the slag hole is communicated with the sewage draining outlet to form a back washing channel, a filter is arranged on the filtering channel, and a back washing device is arranged on the back washing channel. The filtering device can separate heavy iron slag particles from slag-washing water by centrifugal rotational flows, and can filter small slag wool and suspended matters by a filter screen. That is to say, the filtering device can realize coarse filtration and fine filtration simultaneously, the filtering efficiency and the filtering quality are improved, the back washing device can realize online full-automatic back washing, the operation is simple and convenient and the operating efficiency is further improved.

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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