Advanced silica refractory and manufacturing technique thereof

Abstract

The invention relates to a silicon refractory material with composition proportions of 3.0-1.0 mm and 30 to 55 percent of natural silica, 3.0 to 1.0mm and 0 to 15 percent of waste silica brick particles, 1.0 to 0.09mm and 10 to 25 percent of the natural silica, 3.0 to 1.0 mm and 0 to 15 percent of the waste silica brick particles, 10 to 25 percent of the natural silica plus waste silica brick powder plus calcinations silica less than 0.09mm, 1 to 5 percent of non-aluminum high C3S cement or calcium hydroxide powder, SiO2 no less than 98 percent, 0 to 5 percent of silica micropowder with median particle size D50 no more than 10 Mum, 1 to 5 percent of silica fume with SiO2 no more than 96 percent, 0.05 to 1.0 percent of high-efficiency water reducing agent and 0.03 to 1.0 percent of organic binder; 1 to 2 percent of fluorite, 0 to 6 percent of calcium sulfate, 0 to 4 percent of magnesium sulfate or magnesium oxide are doped as mineralizer. The production process comprises the process that after weighing, mixing and melting, forming and drying, the raw material is roasted as finished products under 1350 to 1460 DEG C for 10 to 36 hours. The invention has the advantages of good forming, rapid demoulding speed and excellent high temperature performance, which is suitable for silicon refractory material for glass manufacture, and large and special shaped silicon dioxide refractory material products.

Description

technical field [0001] The invention relates to a high-grade silicon refractory material. The material is mainly composed of natural silica, silica clinker, siliceous micropowder, aluminum-free ultrafine Portland cement and chemical admixtures. Fast demoulding speed, excellent high temperature performance, suitable for making advanced silica refractory materials for glass industry, especially large silica refractory products. Background technique [0002] Silica brick is a commonly used refractory material. Small-sized silica bricks are formed by a press, and large-scale silicon products need to be manually formed by ramming. Manual molding has high labor intensity, low green body density, and poor product quality stability. Large-scale clay and high-alumina products refer to the process of low-cement and ultra-low-cement castables: first prepare unshaped materials, shape them by vibration, and then make large-scale castables through curing, demoulding, drying, firing and...

AI Technical Summary

Problems solved by technology

Na 2 O steam is easy to react with phosphoric acid-bonded silicon refractories, causing the material to be destroyed quickly