In-situ generated self-lubricating low-melting phase rare earth modified drainage sand and preparation and pouring method

Abstract

The application discloses in-situ generated self-lubricating low-melting phase rare earth modified drainage sand and a preparation and pouring method, and belongs to the technical field of steel metallurgy continuous casting refractory materials. The application uses chromite and magnesite as base materials, adds cerium dioxide and trace borides as modified components, and discards traditional quartz and feldspar plus low-melting minerals. After a ladle is filled with high-temperature molten steel, high-melting-point cerium aluminate solid skeletons are generated through in-situ solid-phase reaction of molten steel heat storage, and trace Ce-B-O self-lubricating low-melting liquid phases are precipitated. The drainage sand is filled into a ladle nozzle through a layered filling mode, the internal binding force of the sintered layer of the drainage sand is weakened by using the trace self-lubricating liquid phase, the sintered shell is separated along the lubricating phase interface, and automatic pouring without manual intervention is realized. The ladle automatic pouring rate of the application is stable and reaches more than 99.8%, and the high-temperature erosion rate of the seat brick and the slide plate refractory is reduced by 40%-60% compared with the prior art. The application is complete with a preparation process of the drainage sand.