Expanded bead preparation device and preparation method thereof

Abstract

The invention relates to an expanded bead preparation device and a preparation method thereof. The device comprises a molten blast furnace slag drainage structure, a granulation structure, a cooling structure and a heat recovery structure, wherein the molten blast furnace slag drainage structure is used for introducing molten blast furnace slag into the granulation structure; the granulation structure is used for granulating the molten blast furnace slag; the cooling structure is used for cooling the molten blast furnace slag in the granulation process; and the heat recovery structure is usedfor performing collection and heat storage on high-temperature gases produced in the granulation process. According to the device, only a graphite crucible and a rotating disc are directly contacted with the blast furnace slag, and only the rotating disc causes scouring. Compared with the current industrial preparation, the cost is greatly reduced. The expanded bead preparation method comprises astep of preparing expanded beads by adopting the expanded bead preparation device. Since production is performed in a closed system, the hazard level is reduced, the produced pollutants such as slag wool do not spread out of a granulation furnace, and hazards to health of workers are reduced. The noise pollution can be decreased in a closed space.

Description

technical field [0001] The invention relates to blast furnace slag processing equipment, in particular to a device for preparing expanded beads and a preparation method thereof. Background technique [0002] The treatment methods of blast furnace slag mainly include water slag method, natural stacking and air cooling, and pre-furnace bead expansion method, etc. However, because the water slag method consumes a lot of water, the slag-water ratio is about 1:6~10, and a large amount of steam will be generated, and the steam volume is about 600m 3 / t (slag), and also produce H 2 S, S0 2 and S0 3 and other toxic and harmful gases. Its concentration H 2 S is 19.23mg / m 3 , S0 2 4.3mg / m 3 , These poisonous and harmful gases have seriously polluted the factory area and the atmosphere, and the natural stacking air cooling method not only occupies a large amount of factory space, but also wastes a lot of sensible heat from blast furnace slag. [0003] The method of expanding b...

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Problems solved by technology

[0004] The current industrial preparation of expanded beads in front of the furnace is produced under semi-open conditions, which has the following defects: 1. The high-temperature steam formed by the molten blast furnace slag meeting water, as well as the sensible heat released and let formed by the exchange of blast furnace slag and air The expanded beads rich in sensible heat are naturally cooled in the air, and the factory does not recover these heats; 2. The preparation of expanded beads under semi-open conditions will be more dangerous, and pollutants such as slag cotton will endanger the health of workers. In addition, the noise is louder It is not easy to control; 3. The required equipment such as the slag tank and the drum will have high requirements on the material due to high temperature erosion, which makes the equipment replacement frequency fast

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