Low silicon calcium tundish dry vibratory material and preparation method thereof

Abstract

The invention relates to a low silicon calcium tundish dry vibratory material and a preparation method thereof. The adopted technical scheme is as follows: mixing 75-85wt% of doloma or magnesium doloma, 10-17wt% of sintered magnesium sand or electric melting magnesium sand fine powder, 3-7wt% of bonding agent and 0.5-3.0wt% of additive, forming by stirring and vibrating, baking at 100-150 DEG C, and demoulding to obtain the low silicon calcium tundish dry vibratory material; wherein the CaO of the doloma is larger than 50wt% and the CaO of the magnesium doloma is smaller than 50wt%; the graincomposition of the doloma and the magnesium doloma is 35-45wt% of 3-1mm, 20-35wt% of 1-0mm, and 10-20wt% of less than 0.088mm. The invention features simple technique, convenient construction, low cost, environmental protection and energy saving; the prepared tundish dry vibratory material has the characteristics of higher continuous casting rate, excellent metallurgy effect and easy decomposition after use and is mainly suitable for continuously casting the tundish working liner.

Description

technical field [0001] The invention belongs to the technical field of tundish dry vibration material. In particular, it relates to a low-silicon-magnesium-calcium tundish dry vibration material and a preparation method thereof. Background technique [0002] The tundish is the last metallurgical vessel in the steelmaking process. With the breakthrough of the rapid replacement nozzle technology of the continuous casting tundish, after the working lining of the tundish has gone through the stages of heat insulation board and smearing material, the research and development of dry vibrating material for the intermediate package, which improves the service life of the tundish and reduces energy consumption. For example: "continuous casting tundish alkaline dry working lining" (CN01115190.0) patented technology is an amorphous composition with magnesia as the main body, and its components are calculated by mass percentage: magnesia 85-95% , 0.5-3.0% boride, 2-10% thermoplastic, ...

AI Technical Summary

Problems solved by technology

[0003] Although the above-mentioned dry materials have the characteristics of convenient construction, low energy consumption, long life and improved working efficiency of the tundish, they have the following disadvantages: phenolic resin is not only expensive and costly, but also has irritating gases such as Ammonia, formaldehyde and free phenol are produced, polluting the environment and endangering the health of workers. The carbonized carbon and hydrogen have obvious carbon and hydrogen increasing effects; dry materials with phosphate and sulfate as binders are used in baking and use In the process, strong irritating gas is also produced, which pollutes the environment and endangers the health of workers; using sodium silicate and sodium metasilicate as a binder, introducing a large amount of "silicon" and "sodium" will lead to the increase of oxygen in molten steel and the increase of low-melting substances , which significantly affects the metallurgical effect, high temperature performance and disintegration performance of the material