Liquid blast furnace slag granulation method and device thereof

Abstract

The invention relates to liquid blast furnace slag granulation method and device thereof, belonging to the technical field of blast furnace utilization in the metallurgy industry. The device comprisesa diversion trench, a slag dropping hole, a granulation device, two or more granulation nozzles and a slag discharging hole. The invention realizes dry process quenching granulation adopting high-speed gas and solid phases carrying solid granules as granulation media, impacting liquid blast furnace slag to crushing, and quenching and solidifying into small granules. In the granulation device, thediversion trench is built by refractory materials and is arranged at the top of the granulation device, the lowest point of the diversion trench is provided with the slag dropping hole which is communicated with the granulation device, the upper part of the granulation device is provided with the granulation nozzles, and an included angle between the outlet axes and the vertical direction of thegranulation nozzles is more than 0 degree and is less than or equal to 90 degrees. The granulation nozzles can be arranged at one side or are symmetrically arranged or circularly arranged by using a center perpendicular line of the slag dropping hole as the center of a circle. The invention strengthens the granulation effect and lowers the power consumption and the equipment investment of the granulation device by utilizing the capacity of crushing the liquid blast furnace slag by a gas-solid two-phase strong jet flow.

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...

AI Technical Summary

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.

The centrifugal granulation method relies on the centrifugal force generated by the high-speed rotation of the turntable or cup to granulate the liquid blast furnace slag. Although it does not require high energy-consuming equipment such as a granulation fan, and the particle size distribution of the granulated slag is small, it is The mechanical reliability of the high-speed rotary granulation device at high temperature is poor, and its adaptability to load changes has yet to be confirmed

Images