Blowing and stirring integrated type molten iron pretreatment desulphurization device and method

Abstract

The invention discloses a blowing and stirring integrated type molten iron pretreatment desulphurization device and method. A powder-gas conveying pipe at the lower ends of weighing hoppers is in flexible connection with a powder spraying gun. The lower end of a fixed sleeve which is arranged outside the powder spraying gun in a sleeving mode is connected with a hollow transmission shaft through a bearing sleeve. A driven gear in which the bearing sleeve is embedded is engaged with a driving gear connected with a motor. A powder spraying pipe located at the lower end of the transmission shaft is buried in a stirring blade provided with a powder spraying channel. The stirring blade is inserted into a molten iron ladle cover. The method comprises the steps that the molten iron ladle cover is descended to the position above the edge of a molten iron ladle, the stirring blade enters the ladle cover to start a blowing system, and after the stirring blade conducts blowing in molten iron for 10-20 s, a stirring system is started for desulphurization; blowing and stirring are conducted for 8-20 min, and if the sulphur content in the molten iron reaches the standard, slagging-off operation is conducted; otherwise, desulphurization continues to be conducted till converting requirements are met; and the motor stops operating after the desulphurization, the blowing system is ascended, and blowing is stopped when the lower end of the stirring blade is flush with the edge of the molten iron ladle. According to the device and method, compared with a blowing method, the desulfurization rate is increased, and the consumption amount per ton of desulfurizing agents is reduced; compared with a KR stirring method, the temperature drop of the molten iron is reduced, and the service life of a stirring head is prolonged.

Description

technical field [0001] The invention belongs to the field of pretreatment and desulfurization of molten iron before steelmaking, and in particular relates to a blowing and stirring composite type molten iron pretreatment desulfurization device and method. Background technique [0002] Compared with steelmaking desulfurization or refining desulfurization, the hot metal pretreatment desulfurization process is simpler, and it is one of the effective ways to reduce the desulfurization burden of ironmaking and steelmaking processes, simplify operations and improve the technical and economic indicators of ironmaking and steelmaking. Countries such as Western Europe and Japan have used hot metal pretreatment technology for production since the late 1970s, and it has been widely used in developed countries in the 1980s. In 1995, it can be seen from the regulations on sulfur content in steel in Japan, the United States and other countries that the sulfur content of ordinary steel is ...

AI Technical Summary

Problems solved by technology

The stability is poor, and the safety and operating costs of the transportation and storage of the desulfurizer are lower than those of the mechanical stirring method

From the point of view of the temperature drop of molten iron, the rapid stirring of the stirring method will cause the temperature drop of molten iron to increase, and the temperature requirement for molten iron is higher

Images