Cyclic preparation method of low-temperature high-strength corrosion-resistant large-density foam glass

Abstract

The invention relates to a cyclic preparation method of low-temperature high-strength corrosion-resistant large-density foam glass. The cyclic preparation method has the advantages that by glassy-state prepared materials, special designing of the steps of preprocessing, pressurization, foaming and demoulding and special optimization of relevant parameter, the defect that the common foam-glass preparation process is difficult to obtain the low-temperature high-strength corrosion-resistant large-density foam glass, the quality of a product is optimized, the toxic and side effects are reduced, the process operation is simple, the yield is higher, the product is high in strength, large in density, high in corrosion resistance, low in water absorption rate, lower thermal expansion coefficient and thermal conductivity coefficient and higher in thermal shock resistance and closed porosity; especially, the mechanical property of the modified low-temperature foam glass is obviously improved; and the preparation method is simple in process and low in cost and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of foam glass, in particular to a cyclic preparation method of foam glass, and more specifically to a cyclic preparation method of low-temperature, high-strength, corrosion-resistant and large-density foam glass. Background technique [0002] In the past two decades, foam glass is a porous material filled with countless tiny connected or closed pores, mainly used as thermal insulation for building exterior walls, petrochemical deep storage cold storage, corrosion-resistant lining blocks for flues and pipes Material. At present, the raw materials for the production of foam glass are mainly cullet and industrial waste, but these raw materials have unstable chemical composition and contain many impurities, so the performance of foam glass cannot be well controlled. The foam glass prepared by using waste glass as raw material is generally not high in strength, while the foam glass prepared by usi...

AI Technical Summary

Problems solved by technology

The porous material obtained by foaming or freely foaming water glass modified without adding other raw materials has extremely poor chemical stability, and the pore structure has defects such as non-uniform cell diameter and uneven distribution.

[0013] In addition, in the prior art, the application number is: 200810063163, which discloses a cyclic production process of foam glass, which has defects such as not being able to operate large-density foam glass and unstable product quality; the application number is 200710019008, which is Relevant process parameters have low requirements on the strength and corrosion resistance of the product, and it is impossible to achieve high strength and corrosion resistance, and the selection of raw materials is limited to defects such as high-density materials.

[0014] At present, the domestic production process is to use no release agent to cover and foam, the mold box is disassembled and demolded, and the batch material is prepared by batch ball mill, manual powder unloading, manual weighing and adding powder, manual powder scraping, manual handling and pushing Entering the kiln, the temperature is high, the labor intensity is high, and the dust is flying, seriously affecting the work and the surrounding environment, causing serious damage to the physical and mental health of the workers, manual work, large errors, low production efficiency, poor and unstable product performance, kiln furnace It is a tunnel kiln, mainly electric heating, with low firing temperature, uneven temperature, and low production capacity. At present, the production line with the largest domestic production capacity is only 10,000 cubic meters per year in a single line. The production process does not use vibration exhaust, grille Pressing and other processes, product performance: bulk density, thermal conductivity, compression resistance, water absorption, modulus of rupture, low temperature, high strength, corrosion resistance, etc., and stability still have a certain gap with international products