Wind-crushing water-cooling granulating method and device for high-temperature liquid-state steel slag, granulating steel slag and use thereof

Abstract

The invention provides a wind-crushing water-cooling granulating method of high-temperature liquid steel slag, a granulating device and granulated steel slag and use thereof. The invention belongs to the industrial waste comprehensive utilization filed and particularly relates to the treatment and the utilization of high-temperature liquid steel slag. The wind-crushing water-cooling granulating method of high-temperature liquid steel slag comprises the following steps: liquid steel slag flowing out from a tundish is granulated in the air through the high-speed compressed airflow ejected by a granulator; the granulated steel slag is dropped into a water pool so as to be cooled down; moreover, the pressure of the compressed air is controlled between 0.59 MPa and 0.70 MPa, and the degree of superheat of the liquid steel slag is controlled above 110 DEG C. The granulating device comprises a tundish, a granulator and a water pool, and is characterized in that: a tundish rapid heating-up device is arranged near the granulator; and a compressed air pipe is connected with a compressed air pressure automatic display monitoring device. The final blow rate of steel slag is increased from the 80 percent of the prior art to 95 percent and the steel slag has fine particle diameter; moreover, because unstable phase is eliminated, the steel slag can be directly used in the preparation of cement concrete of various strength grade labels from C30 to C80.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial waste, and in particular relates to the treatment and utilization of high-temperature liquid steel slag. Background technique [0002] Chinese utility model patent "steel slag air crushing and granulating device", patent No. 8821127.6, the disclosed device is composed of a tundish, an atomizer (equivalent to the granulator of the present invention) and a pool, and the bottom of the tundish and the chute have a certain slope The atomizer is connected to the intake pipe, the front nozzle holes are arranged in an H shape, the main nozzle holes are arranged horizontally in the middle of the H shape, and the auxiliary nozzle holes are arranged longitudinally on both sides of the main nozzle hole, and the atomizer can be adjusted through the angle positioning plate Change the spray angle. Due to the low compressed air pressure and no measures to control the flow properties of stee...

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Problems solved by technology

Due to the low pressure of compressed air and no measures to control the flow properties of steel slag, the blowing rate of steel slag is low, only about 80%, and some large particles in the granulated steel slag also contain unstable phases, which affects the use of steel slag

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