Preparation method of magnesia-alumina-spinel high-grade thermal-insulation material

Abstract

The invention relates to a preparation method of a magnesia-alumina-spinel high-grade thermal-insulation material, which comprises the following steps: by using 56-71.8 parts by mass of white alundum fine powder, 15-28.2 parts by mass of fused magnesite and 12.5-17.5 parts by mass of rho-Al2O3 as raw materials, carrying out co-grinding in a ball grinder for 1-5 hours to obtain raw material powder; adding 37-52 parts by mass of water solution containing 2-5 parts by mass of additional component to obtain raw material slurry; weighing a right amount of 1 wt% foaming solution, and foaming for 3-5 minutes by using a high-speed stirrer to obtain foam; and adding the foam into the raw material slurry, calibrating the volume, stirring uniformly, carrying out cast forming, drying, and firing by keeping the temperature at 1550-1650 DEG C for 3-6 hours. The particle size of white alundum fine powder is 180 meshes; the particle size of the fused magnesite is 200 meshes; and the additional component comprises a billet reinforcer containing one or more of polyvinyl alcohol, calcium lignosulphonate and starch, and a rho-Al2O3 hydration control agent containing one or more of sodium carbonate, sodium hexametaphosphate, sodium tripolyphosphate and lithium carbonate.

Description

technical field

[0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a preparation method of a magnesium-aluminum spinel high-grade thermal insulation material. Background technique

[0002] The thermal insulation, energy saving and consumption reduction of high temperature kilns and thermal equipment have always been highly concerned by people. Insulation materials for medium and high temperature (below 1500°C) kilns and thermal equipment include lightweight clay bricks, anorthite lightweight insulation bricks, lightweight high alumina bricks, lightweight silica bricks and lightweight mullite bricks. Stone bricks, etc., but the advanced insulation materials used for high temperature and ultra-high temperature kilns and thermal equipment above 1500 °C are currently mainly (polycrystalline) alumina (zirconium) refractory fibers and alumina (zirconium) hollow ball bricks. Although (polycrystalline) alumina (zirconiu...