Liquid blast furnace slag granulation device and granulation method thereof

Abstract

A liquid blast furnace slag granulation device comprises a gate, a granulator, a primary turntable, a water nozzle, a secondary turntable, a drive device, a center water pipe, a hopper and an exhaust pipe, wherein the gate is arranged in the middle part of the upper part of the granulator, the upper half part of the granulator is in a water cooled wall structure, the lower half part of the granulator is contracted to form the hopper, the primary turntable, the water nozzle, the secondary turntable, the drive device and a center water pipe are arranged on the center line of the interior of the granulator, the diameter of the secondary turntable is larger than that of the primary turntable, the water nozzle is located between the primary turntable and the secondary turntable, the opening direction of the water nozzle points at the upper surface of the secondary turntable, the center water pipe is arranged on the center of the turntables, the upper part of the center water pipe is connected with the water nozzle, and the lateral wall of the granulator is connected with the exhaust pipe. The liquid-state blast furnace slag is crushed and condensated into solid particles under the action of centrifugal force and water film bursting force. The invention utilizes the centrifugal force and bursting force of water flash vaporization and expansion, enhances the granulation effect, reduces power consumption and equipment investment of the granulation device, and has small water consumption and water resource saving.

Description

technical field [0001] The invention relates to a liquid blast furnace slag granulation method and a device thereof, belonging to the technical field of blast furnace slag utilization in the metallurgical industry. Background technique [0002] Blast furnace slag is a silicate material with good properties, which can be used as a raw material for the production of building materials and fertilizers. After rapid cooling, liquid blast furnace slag has no time to form mineral crystals and stores part of the chemical energy in the formed glass body, so it has high activity. The blast furnace slag after quenching treatment has potential hydraulic gelling properties and is excellent. Cement raw materials, so quenched blast furnace slag has a huge market demand. [0003] At the same time, the temperature of liquid blast furnace slag is between 1350°C and 1500°C, which belongs to high-grade waste heat resources and has high recycling value. [0004] At present, my country's liquid...

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Problems solved by technology

[0004] At present, my country's liquid blast furnace slag is mainly quenched by water quenching method. The blast furnace slag after water quenching can be used to make building materials such as cement. The problems of water quenching method are: high water consumption; 2 S and SO x It is discharged into the atmosphere with steam, which promotes the formation of acid rain and pollutes the environment; the sensible heat of blast furnace slag has not been recycled; the water-quenched slag has a high moisture content, and it still needs to be dried as a cement raw material, which requires a certain amount of energy; the system consumes a lot of power; The fine particles contained in the circulating water of water flushing slag will cause serious wear and blockage of pumps and valves and other components, and the system maintenance workload is very large, which increases maintenance costs

The wind quenching method uses a high-power granulation fan to generate high-pressure, high-speed airflow to blow off and granulate the slag flow. The main disadvantages are large power consumption, large and complex equipment, large floor area, and high investment and operating costs.

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