Tundish covering agent prepared by using blast furnace slag

Abstract

The invention provides a tundish covering agent prepared by using blast furnace slag. The tundish covering agent prepared by using the blast furnace slag comprises the following raw materials, by 100 parts of weight, 30-45 parts of the blast furnace slag, 24.7-40 parts of limestone, 10-20 parts of vermiculite and 10 -20 parts of fluorite. Primary raw materials adopted by the tundish covering agent prepared by using the blast furnace slag are low in cost, appropriate in melting points, short in melting time, and excellent in spreadability and heat retaining property. The tundish covering agent prepared by using the blast furnace slag can prevent molten steel from being secondarily oxidized and temperature drop from being too much, meanwhile, the tundish covering agent prepared by using the blast furnace slag has certain absorption mixing performance, can purify the molten steel, and improves inner quality of casting blank; no carbon exists in the tundish covering agent prepared by using the blast furnace slag, alkalinity is appropriate, recarburization is not generated to the molten steel, alkalinity-resisting materials of a tundish is not corroded, and service life of the tundish is prolonged.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a tundish covering agent, in particular to a tundish covering agent prepared from blast furnace slag. Background technique [0002] The tundish is between the ladle and the crystallizer. It receives the molten steel from the ladle and diverts it to the mold. It is the main equipment in the continuous casting process. The tundish has stable steel flow, uniform molten steel temperature, and promotes the floating of non-metallic inclusions Elimination, the multi-strand continuous casting machine divides the molten steel from the tundish, and plays the role of buffering and cohesion when multiple furnaces are continuously casting and changing ladles. This requires the tundish covering agent to have functions such as heat preservation, reduction of secondary oxidation, and adsorption of non-metallic inclusions. [0003] The tundish covering agent for pure steel disclosed in Chinese patent ZL02...

AI Technical Summary

Problems solved by technology

Although the above two covering agents have certain positive effects in practice, carbonized rice husk, as a traditional covering agent, easily leads to carburization of molten steel, serious dust pollution and poor spreadability; Al 2 o 3 -SiO 2 The base neutral covering agent has low cost and less carbon increase in molten steel, but its thermal insulation performance is poor; the alkaline covering agent is mainly composed of CaO and MgO, which has a strong ability to absorb non-metallic inclusions and has good compatibility with the refractory lining. It is easy to crust, which is not conducive to the application in large-scale production