A kind of preparation method of lightweight silica brick

Abstract

The invention relates to a preparation method of a light-weight silica brick. According to the technical scheme, the preparation method comprises the following steps: uniformly mixing 30wt%-60wt% of silica particles, 10wt%-30wt% of fine silica powder, 2wt%-6wt% of limestone, 5wt%-15wt% of silica sol and 10wt%-30wt% of coke, and vibrating or ramming for forming; and drying formed blank bodies at 110 DEG C for 4-24 hours, and insulating at 1200-1400 DEG C for 3-15 hours to obtain the light-weight silica brick. The preparation method is simple in process, the adopted raw materials are rich, and the prepared light-weight silica brick has the characteristics of uniform microscopic structures, small volume density, excellent heat insulation performance, high refractoriness under load, good high-temperature volume stability, rich raw materials and wide application range.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a method for preparing lightweight silica bricks. Background technique [0002] With the increasing shortage of energy, countries pay more and more attention to the development, production and use of energy-saving materials for high-temperature industry. Due to the characteristics of light weight, high porosity, low bulk density and low thermal conductivity, lightweight refractory materials have obvious advantages in energy saving, so they have been widely used in high-temperature industries, playing the role of heat preservation, energy saving and consumption reduction. [0003] Silica bricks have been widely used and researched in lightweight refractory systems due to their high load softening temperature, good volume stability at high temperatures, and no shrinkage after long-term use. At present, there are many methods for manufacturing lightweight ...

AI Technical Summary

Problems solved by technology

However, there is an obvious shortcoming in the machine-compressed combustible method, that is, there is a problem of uneven distribution of raw materials in the process of mixing and machine-pressing, especially in which combustibles are difficult to mix evenly in dry mixing, and there is often particle segregation, resulting in After the material is fired, the microstructure is uneven, for example: some parts have high porosity, and some parts have low porosity; which in turn affects the stability of light material properties, such as high temperature volume stability, load softening temperature and thermal conductivity, etc.

[0006] Furthermore, iron scale and lime milk are widely used as mineralizers in the production of traditional lightweight silica bricks, both of which will reduce the high-temperature mechanical properties of the material; With suitable strength, lignin sulfonate is often added as a binder when mixing raw materials, which will also reduce the high temperature mechanical properties of the product