Environment-friendly magnesium dry material and its preparation process

Abstract

The present invention adopts the following environment-friendly magnesium dry material, including a mass ratio of 60-75:20-30:8-10:15-25:8-12:2-4.5:1-2:0.5-1.5 : 0.8~1.2 sintered magnesia, fused magnesia, calcium magnesium olivine, binder, aluminum hydroxide powder, high temperature sintering agent, expansion agent, floating beads, bentonite. The invention optimizes the distribution ratio of each component of the dry material, adopts an environmentally friendly binder, can effectively solve the problem that the binder decomposes into toxic and harmful substances under high temperature conditions, is more energy-saving and environmentally friendly, and makes the dry material useless during use. The pungent taste is more conducive to the production environment, and it can also ensure the hardness requirements of the dry material during use and ensure its erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an environment-friendly dry magnesium material and a preparation process thereof. Background technique [0002] With the great development of the world's iron and steel production technology, a tundish metallurgical process has been formed. The tundish has changed from a simple molten steel transition container in the continuous casting system to a refining device with multiple refining functions. The tundish refining technology has also become an important part of clean steel production. one of the important technologies. As an important thermal equipment in continuous casting production, the tundish not only plays the role of uniform molten steel temperature, but also acts as a buffer between the ladle and the crystallizer, which has a great impact on the quality, cost and smooth progress of continuous casting has a pivotal role. [0003] The dry mate...

AI Technical Summary

Problems solved by technology

[0004] At present, the most widely used and effective low-temperature binder in tundish dry materials is thermoplastic phenolic resin, which is developed with magnesia as the main raw material, calcium-containing materials, various sintering aids, and high-temperature modifiers. It is a kind of refractory material; but the residual carbon and hydrogen produced by solid phenolic resin during the baking of dry materials will add carbon and hydrogen to molten steel, thereby affecting the quality of steel billets; at the same time, solid phenolic resin will produce a large amount of Harmful and irritating gas, causing a certain degree of harm to the construction workers and the environment on site, does not meet the production requirements of clean, green and environmentally friendly high-quality steel billets

[0005] In order to solve the above problems, other types of binders are used in the prior art to replace phenolic resins, for example: a mixture of glucose+water glass, hydroxyethyl cellulose+ -Al 2 o 3 mixture, rosin + borate glass powder, etc., but when the use of different binders is used to bond magnesia, as the temperature of the baking process increases, the medium and high temperature strength of the dry material is not enough. Washing makes it easy to fall off, which affects the use effect of dry materials

Images