Mechanical granulation and heat recovery device of liquid slag

Abstract

The invention discloses a mechanical granulation and heat recovery device of liquid slag, which comprises a slag holding container, two granulation rollers, a driving device, a motor, a primary fan, a vertical heat exchange furnace and a secondary fan, wherein a slag inlet and a hot air outlet are arranged at the top of the slag holding container, and the two granulation rollers are horizontally separated from each other and parallel to each other; the two ends of the two granulation rollers are arranged on the slag holding container, and the two granulation rollers can rotate relative to theslag holding container; the outer surfaces of the two granulation rollers are provided with grooves, and one end of each of the two granulation rollers are respectively connected with the two output shafts of the driving device through respective couplings; the input shaft of the driving device is connected with the motor, and a cold air inlet is respectively arranged at the upper part and the lower part of the slag holding container and is connected with the primary fan; a slag outlet device is arranged at the bottom of a cone structure of the lower part of the slag holding container, and a slag inlet is arranged at the top of the vertical heat exchange furnace; an air outlet is arranged on the side wall of the upper part, and an air inlet is arranged on the side wall of the lower part; and a discharging device is arranged at the lower end, and the secondary fan is connected with the air inlet on the side wall of the lower part of the vertical heat exchange furnace.

Description

technical field [0001] The invention relates to a liquid slag mechanical granulation and heat recovery device. Background technique [0002] At present, the reuse of waste slag in the iron and steel industry is to use the slag as a raw material for the cement industry after granulation and further fine grinding. An existing blast furnace liquid slag granulation treatment method is a water slag treatment method, that is, a water quenching method in front of the furnace. The main feature of this method is that when the blast furnace slag is discharged, high-pressure water is sprayed into the high-temperature slag to rapidly cool the slag, thereby obtaining granulated slag. On the one hand, this method consumes a lot of water. On the other hand, the waste heat of the slag cannot be recovered. At the same time, the elements in the slag enter the water vapor and produce a large amount of harmful gases to pollute the air. In addition, due to the high water content of the treated...

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Problems solved by technology

On the one hand, this method consumes a lot of water. On the other hand, the waste heat of the slag cannot be recovered. At the same time, the elements in the slag enter the water vapor and produce a large amount of harmful gases to pollute the air.

In addition, due to the high water content of the treated granulated slag, it must be dried in the subsequent cement production, so not only need to increase the drying equipment, but also consume a lot of energy

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