Silicon oxide refractory castable and using method thereof

Abstract

The invention discloses a silicon oxide refractory castable and a using method thereof. The castable consists of aggregate, powder, a coagulant and an external binding agent, wherein the aggregate consists of calcined silica, scrap for a waste silica brick recyclable material and a mixture of the calcined silica and the scrap, and the total amount accounts for 60-70 percent of the sum of mass of the aggregate and powder; the powder consists of calcined silica powder and silica powder or superfine quartz sand, and the total amount accounts for 30-40 percent of the sum of mass of the aggregate and powder; the coagulant is fettling magnesite grain powder, and the total amount accounts for 2-4 percent of the sum of mass of the aggregate and powder; and the external binding agent is an aqueous solution of phosphoric acid and aluminium dihydrogen phosphate, and the total amount respectively accounts for 3-5 percent and 8-12 percent of the sum of mass of the aggregate and powder. The silicon oxide refractory castable has high-temperature performances of high load softening temperature, high high-temperature strength, wide application temperature range, stable high-temperature size and excellent thermal shock resistance and is wide in raw material distribution, high in yield, low in cost and convenient to popularize and apply.

Description

technical field [0001] The invention relates to a refractory castable and a method for using the same, in particular to a silicon oxide refractory castable and a method for using the same. Background technique [0002] The low-cement, ultra-low-cement combined with high-alumina refractory castables widely used in the market at present have significantly improved high-temperature performance compared with traditional cement-based refractory castables. "Low cement refractory castable" is one of them. However, due to the presence of CaO in the material, the eutectic phase is bound to be produced, resulting in a lower load softening temperature and lower high-temperature strength of this type of castable. At the same time, high-quality high-alumina ore raw materials are gradually depleted, and prices have risen sharply. Two factors have seriously restricted the application of this type of refractory castable in high-temperature fields. Contents of the invention [0003] The ...

AI Technical Summary

Problems solved by technology

However, due to the existence of CaO in the material, the eutectic phase is bound to be produced, resulting in a lower load softening temperature and lower high-temperature strength of this type of castable.

At the same time, high-quality high-alumina ore raw materials are gradually depleted, and the price has risen sharply. Two factors have seriously restricted the application of this type of refractory castable in high-temperature fields.