Device and method for preparing molten iron heat preservation slag melting agent for ironmaking

Abstract

The invention provides a device and a method for preparing a molten iron heat preservation slag melting agent for ironmaking. The device comprises a material mixing device, a tubular granulation device and a composite separation device, the composite separation device comprises a screening bin body; a spiral screening mechanism is axially and rotationally arranged in the screening bin body, the spiral screening mechanism comprises a supporting barrel and screening spiral pieces arranged in the circumferential direction of the supporting barrel, and a material blocking mechanism is arranged between the lower edges of the screening spiral pieces and the supporting barrel; the outer diameter of the screening spiral piece is matched with the inner diameter of the screening bin body, and the screening spiral piece is a mesh plate. A plurality of wave guiding openings are formed in the circumferential direction of the bin wall of the screening bin body and correspond to the spiral screening mechanism, and ultrasonic generators are correspondingly connected with the wave guiding openings. The preparation device is compact in structure, efficient separation of granules and powder in the heat preservation slag melting agent can be achieved, roasting and curing of the granules of the heat preservation slag melting agent are achieved, floor occupation of a plant is reduced, and the production efficiency of the granules of the heat preservation slag melting agent is improved.

Description

technical field [0001] The invention relates to the technical field of slag-reducing agents, in particular to a device and a method for preparing a molten iron heat-insulating slag-reducing agent for ironmaking. Background technique [0002] Blast furnace ironmaking inevitably produces a large amount of iron slag and foam. The inherent physical properties and process conditions of these iron slag determine that it is very easy to bond and deposit on the wall of molten iron ditch, molten iron tank, torpedo tank, and iron mixing furnace, resulting in smelting. The service life of iron equipment is shortened. Therefore, it is necessary to use a large amount of thermal insulation slag agent in the production process of iron making to achieve defoaming of molten iron and thermal insulation of slag. The components of the existing thermal insulation slag agent mainly include carbonized materials such as graphite, fly ash, etc., as well as powder materials containing calcium oxide, ...

AI Technical Summary

Problems solved by technology

[0002] Blast furnace ironmaking inevitably produces a large amount of iron slag and foam. The inherent physical properties and process conditions of these iron slag determine that it is very easy to bond and deposit on the wall of the molten iron ditch, iron ladle, torpedo tank, and iron mixing furnace, causing smelting The service life of iron equipment is reduced, so it is necessary to use a large amount of thermal insulation slag agent in the process of ironmaking production to achieve defoaming of molten iron and thermal insulation of slag

The existing thermal insulation slagging agents mainly include carbonized materials such as graphite, fly ash, etc., and also include powders containing calcium oxide, magnesium oxide or alumina. The production process mainly includes powdering raw materials → mixing → manufacturing Granulation→roasting→sieving and other processes, in which the roasting and screening processes usually need to cooperate with conveyors or elevators, resulting in a long process for the preparation of thermal insulation slag agent, which occupies a large area of ​​the workshop, and the solidification and separation efficiency of thermal insulation slag agent pellets lower

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