Process for manufacturing high-strength low-density asbestos fiber-free enhanced silicate plate

Abstract

The invention relates to a process for manufacturing a high-strength low-density asbestos fiber-free enhanced silicate plate. The process comprises the following steps of: 1, adding 5 to 10 mass percent of cellulose fiber into solution containing 38 to 42 mass percent of quartz and 33 to 37 mass percent of lime, and filtering out water to obtain silicate crystal seeds with size within 2 mu m under the high pressure of between 0.85 and 1.1Mpa and at the high temperature of between 175 and 185 DEG C; and 2, adding 3 to 8 mass percent of silicate crystal seeds into the solution containing 38 to 42 mass percent of quartz and 33 to 37 mass percent of lime, adding 5 to 10 mass percent of cellulose fiber into the solution, filtering out water, performing hydration reaction under the high pressure of between 0.85 and 1.1Mpa and at the high temperature of between 175 and 185 DEG C for secondary crystallization and finally pressing the mixture in a plate molding machine. A new material producedby the process has various superior chemical, physical and mechanical properties, such as low density, high bending strength and the like.

Description

Technical field: [0001] The invention relates to the technical field of non-metallic environmental protection building materials, in particular to a manufacturing process of high-strength and low-density non-asbestos fiber-reinforced silicate boards. Background technique: [0002] In the prior art, the non-metallic new building material-non-asbestos fiber reinforced silicate board is a kind of high-purity silica, calcium oxide, and wood fiber as the main raw materials, and it adopts the flow slurry that has been used since the 1990s. The plate-shaped material is made by the process, and then hydrated under high temperature and pressure to form silicate crystals. The hydration reaction sequence is C+S+H→C 2 SH(A)→C 5 S 4 Hn→C 4 S 5 h 5 →C 5 S 6 h 6 . However, practice has proved that the non-asbestos fiber-reinforced silicate panels produced by the above-mentioned process have relatively low physical and mechanical properties, and can only meet the domestic industry ...

AI Technical Summary

Problems solved by technology

However, practice has proved that the non-asbestos fiber-reinforced silicate panels produced by the above-mentioned process have relatively low physical and mechanical properties, and can only meet the domestic industry standards (JC / T564-2000), without international competitiveness. If the existing technology wants to achieve high strength, it must have high density, which is a waste of resources

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