CN-118650151-B - Drainage sand throwing device and method for improving cleanliness of molten steel

CN118650151BCN 118650151 BCN118650151 BCN 118650151BCN-118650151-B

Abstract

The invention relates to the technical field of steelmaking, and provides a drainage sand throwing device and a method for improving molten steel cleanliness, wherein the drainage sand throwing device comprises a guide pipe and a filler, and the guide pipe is suitable for guiding drainage sand into a ladle; the filler is arranged in the guide pipe, a gap is formed between the filler and the inner wall of the guide pipe, and the filler is made of a material with a melting point higher than that of molten steel. According to the drainage sand throwing device, the filling body is arranged in the guide pipe, when the drainage sand is injected into the steel ladle through the guide pipe, the drainage sand is filled in the gap between the filling body and the inner wall of the guide pipe, the filling body occupies part of the space in the guide pipe, so that the filling amount of the drainage sand is reduced, the cost is saved, and the purity of molten steel is improved due to the fact that the amount of the drainage sand entering the molten steel is reduced.

Inventors

XIE JIAYING
LIU CHUNYANG
ZHANG LIJUN
LIU JINGANG
HAO NING
NING LINXIN
XU WENXUAN

Assignees

首钢集团有限公司

Dates

Publication Date: 20260512
Application Date: 20240607

Claims (7)

1. A method for improving the cleanliness of molten steel adopts a drainage sand throwing device and is characterized in that, The drainage sand throwing device comprises: A conduit adapted to direct the drainage sand into the ladle; The filling body is arranged in the guide pipe, a gap is formed between the filling body and the inner wall of the guide pipe, and drainage sand is filled in the gap between the filling body and the inner wall of the guide pipe; The material of the filling body comprises one of magnesium oxide or aluminum oxide; the method comprises the following steps: during ladle hot repair, a filler is put into a guide pipe of the drainage sand putting device; pouring drainage sand in a drainage sand pouring device; the filling body and the drainage sand are thrown into a ladle water inlet through a drainage sand throwing device; when the ladle is opened for casting, the sliding plate of the ladle is opened, the filling body and the drainage sand fall into the tundish, and the filling body naturally floats to the slag layer.
2. The method for improving cleanliness of molten steel according to claim 1, wherein a switch is provided at the end of the guide tube, and the switch is adapted to control the falling and outflow of the filler and the guiding sand in the guide tube.
3. The method for improving cleanliness of molten steel according to any one of claims 1 to 2, wherein the filler is columnar and the height of the guide tube is greater than two thirds of the height of the filler.
4. The method for improving cleanliness of molten steel according to any one of claims 1 to 2, wherein a difference between an inner diameter size of the guide tube and an outer diameter size of the filler is between five and ten mm.
5. The method for improving cleanliness of molten steel according to any one of claims 1 to 2, wherein the drainage sand delivery device further comprises a feed hopper connected to a head end of the guide tube.
6. The method for improving cleanliness of molten steel according to claim 1, wherein the ladle nozzle is provided with a guide surface adapted to guide the guiding sand and the filler body to the inside of the ladle nozzle.
7. The method for improving cleanliness of molten steel according to claim 1, wherein the difference between the outer diameter of the filler body and the inner diameter of the ladle nozzle is between ten and thirty mm.

Description

Drainage sand throwing device and method for improving cleanliness of molten steel Technical Field The invention belongs to the technical field of steelmaking, and particularly relates to a drainage sand throwing device and a method for improving molten steel cleanliness. Background The problem of purity of steel has become a bottleneck in the production of high-end metallurgical products, and therefore, has become increasingly important in the steel industry. In the steelmaking process, there are a number of important process nodes that have a significant impact on the cleanliness of the molten steel. For example, unsteady state during continuous casting can cause the molten steel cleanliness to be poor, particularly, after ladle casting is started, the drainage sand firstly flows into the molten steel of the tundish, so that inclusions are introduced into the molten steel of the tundish, meanwhile, as the main component in the drainage sand is oxide, the inclusions react with [ Al ] in the molten steel to generate Al203 inclusions, the inclusions are difficult to remove in the subsequent process, remain in the steel and finally become harmful inclusions in the steel, and the quality and performance of the steel are affected. Therefore, the use amount of the drainage sand is reduced, the cleanliness of molten steel can be improved, and the production cost is reduced. Disclosure of Invention The invention provides a drainage sand throwing device and a method for improving the cleanliness of molten steel, which can improve the cleanliness of molten steel and reduce the production cost. The invention also provides a method for improving the cleanliness of the molten steel. In a first aspect of the present invention, there is provided a drainage sand delivery device comprising: A conduit adapted to direct the drainage sand into the ladle; The filling body is arranged in the guide pipe, a gap is formed between the filling body and the inner wall of the guide pipe, and the filling body is made of a material with a melting point higher than that of molten steel. According to the drainage sand throwing device provided by the embodiment of the invention, the tail end of the guide pipe is provided with the switch, and the switch is suitable for controlling the dropping and outflow of the filling body and the drainage sand in the guide pipe. According to the drainage sand throwing device provided by the embodiment of the invention, the material of the filling body comprises one of magnesium oxide or aluminum oxide, and the material of the filling body can be other materials with high melting points and difficult reaction with steel. According to the drainage sand throwing device, the filling body is columnar, and the height of the guide pipe is greater than two thirds of the height of the filling body. According to the drainage sand throwing device provided by the embodiment of the invention, the difference value between the inner diameter size of the guide pipe and the outer diameter size of the filling body is between five and ten millimeters. According to the drainage sand throwing device, the drainage sand throwing device further comprises a feeding funnel, and the feeding funnel is connected to the head end of the guide pipe. In a second aspect of the present invention, there is provided a method for improving cleanliness of molten steel, based on the above drainage sand delivery device, comprising: during ladle hot repair, a filler is put into a guide pipe of the drainage sand putting device; pouring drainage sand in a drainage sand pouring device; And the filling body and the drainage sand are thrown into the ladle upper nozzle and the brick cup cavity through the drainage sand throwing device. The method for improving the cleanliness of molten steel according to the embodiment of the invention comprises the following steps: when the ladle is opened for casting, the sliding plate of the ladle is opened, the filling body and the drainage sand fall into the tundish, and the filling body naturally floats to the slag layer. According to the method for improving the cleanliness of molten steel, disclosed by the embodiment of the invention, the ladle upper nozzle is provided with the guide surface, and the guide surface is suitable for guiding the drainage sand and the filling body into the ladle upper nozzle. According to the method for improving the cleanliness of molten steel, the difference between the outer diameter of the filling body and the inner diameter of the ladle upper nozzle is between ten and thirty millimeters. The above technical solutions in the embodiments of the present invention have at least one of the following technical effects: The filling body is arranged in the guide pipe, when the drainage sand is injected into the steel ladle through the guide pipe, the drainage sand fills the gap between the filling body and the inner wall of the guide pipe, and the filling body occupies part of the spa