Popular Science On The Preparation Method Of Lightweight Refractory Bricks Made Of Cordierite

Popular science on the preparation method of lightweight refractory bricks made of cordierite
A method for preparing lightweight refractory bricks made of cordierite, characterized in that 40-85wt% of porous cordierite ceramic particles, 3-12wt% of magnesite fine powder, 6-24wt% of Al (OH) 3 fine powder, and 6-24wt% of silica fine powder are used as raw materials, and 3-10wt% of the binder is added to the raw materials. The mixture is stirred evenly and pressed into shape; Dry the formed body at 110 ℃ for 8-36 hours, and then keep it at 1300-1410 ℃ for 2-10 hours to obtain lightweight refractory bricks made of cordierite; The preparation method of porous cordierite ceramic particles is as follows: mix 8-12wt% coal gangue powder, 33-37wt% Al (OH) 3 powder, 8-12wt% talc powder, 13-17wt% magnesite powder, and 28-32wt% silica powder, and add 3-12wt% water to stir evenly and form the mixture; Dry the formed body at 110 ℃ for 8-36 hours, and then keep it at 1300-1400 ℃ for 1-6 hours to obtain porous cordierite ceramics; Crush porous cordierite ceramics into particles smaller than 8mm to produce porous cordierite ceramic particles.
The following provides a further description of the present invention in conjunction with specific embodiments, without limiting the scope of protection: To avoid repetition, the preparation method of porous cordierite ceramic particles in this specific embodiment is described as follows, which will not be repeated in the embodiments: the preparation method of porous cordierite ceramic particles is to mix 8-12 wt% of coal gangue powder, 33-37 wt% of Al (OH) 3 powder, 8-12 wt% of talc powder, 13-17 wt% of magnesite powder, and 28-32 wt% of silica powder, and add 3-12 wt% of water to the above mixture, stir evenly, and shape; Dry the formed body at 110 ℃ for 8-36 hours, and then keep it at 1300-1400 ℃ for 1-6 hours to obtain porous cordierite ceramics. ***Crush porous cordierite ceramics into particles smaller than 8mm to produce porous cordierite ceramic particles.
Example 1: A lightweight refractory brick made of cordierite and its preparation method. Firstly, use 50-76wt% porous cordierite ceramic particles, 6-10wt% magnesite fine powder, 12-20wt% Al (OH) 3 fine powder, and 12-20wt% silica fine powder as raw materials, and add 3-8wt% * * * pulp waste liquid of the raw materials. Stir evenly and press them into shape under a pressure of 50-100MPa; Dry the formed body at 110 ℃ for 8-16 hours, and then keep it at 1340~1380 ℃ for 3-6 hours to obtain lightweight refractory bricks made of cordierite. In this embodiment, the particle size of magnesite fine powder is less than 50 μ m; The particle size of Al (OH) 3 fine powder is less than 50 μ m; The particle size of silica fine powder is less than 25 μ m; The apparent porosity of porous cordierite ceramic particles is 35-40%, with an average pore size of 10-20 μ m; The particle size ratio of porous cordierite ceramic particles is: 8~5mm, accounting for 6~12wt% of the raw material; 5-3mm accounts for 18-24wt% of the raw material; 3-1mm accounts for 18-24wt% of the raw material; Less than 1mm accounts for 8-16wt% of the raw material. The lightweight refractory brick of cordierite prepared in this example has a visible porosity of 30-38%; The average pore size is 10-20 μ m; The bulk density is 1.56-1.65g/cm3; The compressive strength at room temperature is 60-80MPa.
Example 2: A lightweight refractory brick made of cordierite and its preparation method. Firstly, use 50-76wt% porous cordierite ceramic particles, 6-10wt% magnesite fine powder, 12-20wt% Al (OH) 3 fine powder, and 12-20wt% silica fine powder as raw materials, and add 5-10wt% silica sol to the raw materials. Stir evenly and press them into shape under a pressure of 80-120MPa; Dry the formed body at 110 ℃ for 12-20 hours, and then keep it at 1370-1410 ℃ for 4-8 hours to obtain lightweight refractory bricks made of cordierite. In this embodiment, the particle size of magnesite fine powder is less than 74 μ m; The particle size of Al (OH) 3 fine powder is less than 88 μ m; The particle size of silica fine powder is less than 44 μ m; The concentration of silica sol is 25-30wt%; The apparent porosity of porous cordierite ceramic particles is 38-46%, with an average pore size of 20-30 μ m; The particle size ratio of porous cordierite ceramic particles is: 8~5mm, accounting for 6~12wt% of the raw material; 5-3mm accounts for 18-24wt% of the raw material; 3-1mm accounts for 18-24wt% of the raw material; Less than 1mm accounts for 8-16wt% of the raw material. The lightweight refractory brick of cordierite prepared in this example has a visible porosity of 38-46%; The average pore size is 20-30 μ m; The bulk density is 1.40-1.56g/cm3; The compressive strength at room temperature is 40-60MPa.