Nanometer composite silicon brick and preparation method thereof

Abstract

The invention relates to a nano-sized composite silica brick and a production method thereof. The invention is characterized in that: raw materials and binder of the silica brick are as follows: silica granules and fine powders, waste silica brick granules, calcium carbonate nanoparticles, iron oxide nanoparticles, silicon dioxide nanoparticles, fluorite powders, lime and sulfite pulp wastes. The production method is based on the existing production process of the silica brick, and introduces compound nanopowders in optimal proportions in the production process of the silica brick after high-efficiency dispersion, to produce nano-sized composite silica bricks. With the addition of nanopowders, the performance of silica brick is significantly improved, and manifested as follows: 1) the particle size fraction is more reasonable, the accumulation is compact and the texture is uniform; 2) the slurry has good plasticity and moldability and the production efficiency is improved; 3) the burning temperature is decreased to 20 DEG C, thus realizing energy conservation and discharge reduction; 4) the tridymite is superior in crystallization conversion and has low content of quartz residues; 5) the number of closed pores is increased, the number of opened pores are reduced, the porosity is reduced, and the strength and refractoriness under load are increased; and 6) the final product has good appearance, smooth end surface and good bonding property, and the rate of qualified products is increased.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials (refractory materials), and specifically relates to a nanocomposite silica brick and a preparation method thereof. The various nanopowders used refer to nanometer calcium carbonate, nanometer iron oxide and nanometer silicon dioxide. Background technique [0002] Silica brick is a kind of SiO 2 The traditional refractory products as the main component are acidic refractory materials with high temperature volume stability, good thermal conductivity, excellent resistance to acid slag erosion, especially high softening temperature under load (only 30-50°C difference from refractoriness), etc. features. The main raw material for making silica bricks is silica (quartzite). Our country began to produce general silica bricks in the 1930s, and began to mass produce silica bricks for steelmaking open hearth furnaces and coke ovens in the early 1950s. For half a century, with the ...

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Problems solved by technology

However, iron oxide and calcium oxide used in production are added in the form of fine powder and milk of lime respectively. Compared with nano-scale powder, the particle size of the former is not fine enough, and the dispersion in the silica brick is not uniform enough; the latter actually adds It is calcium hydroxide, and its lime milk solution is easy to flocculate and not easy to disperse, so it is less effective as a mineralizer