Preparation method for compact zirconite overflow brick with high breaking-resistance and low expansion

Abstract

The invention provides a preparation method for compact zirconite overflow brick with high breaking-resistance and low expansion. The method comprises the following steps: (1) adopting zircon sand having a ZrSiO4 content more than or equal to 98.5% as a starting raw material; (2) carrying out acid cleaning for the zircon sand: a hydrochloric acid solution is adopted for immersing the zircon sand, followed by washing through water, and atmospheric drying; (3) calcinating the acid cleaned zircon sand; (4) grinding the calcinated zircon sand in a stirring mill according to the following ratio, by weight, 99.0-99.4% of the zircon sand (having a ZrSiO4 content more than or equal to 99.7%), 0.4-0.8% of TiO2, 0.1-0.2% of phosphoric acid; (5) drying the slurry by baking: a screw dehydrator is adopted for drying; (6) crushing the powder, and carrying out screening through a vibrating screen having 30 meshes; (7) carrying out isostatic pressing; (8) carrying out sintering. According to the present invention, due to establishments of a specific forming institution and a specific sintering institution, thermal shock resistance of the products is improved; the overflow brick having characteristics of larger size, no visible blowholes, no melted holes and no slag corrosion is produced successfully; high-temperature breaking-resistance of the overflow brick is raised; refiring cubical expansivity of the overflow brick is reduced; glass corrosion resistance of the overflow brick is improved so as to prolong service life of the overflow brick.

Description

technical field [0001] The invention relates to the field of zircon refractory materials, in particular to a method for preparing dense zircon overflow bricks with high flexural resistance and low expansion. Background technique [0002] Liquid crystal glass substrates are materials used to produce panels for home appliances such as TVs, computers, and mobile phones. The overflow down-draw method is the most advanced technology for producing glass substrates, and this technology has been monopolized by a few foreign manufacturers. At present, China has begun to break this situation, and the liquid crystal glass forming mold-large dense zircon overflow brick is one of the key components of this production line. [0003] With the continuous development of liquid crystal glass production technology, the size of liquid crystal glass is getting bigger and bigger. The size of the overflow brick directly determines the size of the liquid crystal glass. This places higher demands ...

AI Technical Summary

Problems solved by technology

However, large overflow bricks are prone to cracks during the green molding and firing process, which brings great difficulties to successful production.

[0004] The production of liquid crystal glass puts forward higher requirements on the quality of overflow bricks, requiring low iron and low alkali content, because Fe 2 o 3 When the content is too high, it will cause the glass substrate to generate bubbles during molding, and Na 2 O+K 2 When the content of O, CaO+MgO is too high, it will cause a short circuit phenomenon on the liquid crystal glass panel; at the same time, it is also required that there are no visible pores and melting holes, otherwise these internal defects will directly affect the quality of the liquid crystal glass and the service life of the overflow brick , even failed to successfully produce a qualified liquid crystal glass substrate

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