Light high-strength fabricated board based on waste gypsum board and preparation method thereof
A prefabricated and gypsum board technology, which is applied in the field of building materials, can solve the problems of high value-added utilization of light-weight and high-strength prefabricated boards and high production costs, and achieve the effect of improving later strength, improving lightness and reducing bulk density
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Embodiment 1
[0028] A light-weight and high-strength assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:
[0029] 1) Fully crush the waste gypsum board with a crusher, then fully grind the crushed gypsum board with a ball mill, pass through a 100-mesh sieve, remove the inert components with larger particle sizes and the protective paper, and sort out the effective group points (waste gypsum powder);
[0030] 2) Step 1) gained waste gypsum powder is mixed with calcium chloride solution (20wt%) and activator (citric acid, nano-titanium dioxide, sulfuric acid in a molar ratio of 20:5:1 (wherein citric acid is analytically pure grade; nano-titanium dioxide is analytically pure, with an average particle diameter of 24nm; the concentration of sulfuric acid is 10wt%, and its dosage is based on the introduced H 2 SO 4 ), fully mixed according to the mass ratio of 1:3:0.02%, and then left to stand at room temperature (24h; the temperature i...
Embodiment 2
[0035] A light-weight and high-strength assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:
[0036] 1) Fully crush the waste gypsum board with a crusher, and then fully grind the crushed gypsum board with a ball mill, pass through a 150-mesh sieve, remove the inert components with larger particle sizes and the protective paper, and sort out the effective group Minute;
[0037] 2) The waste gypsum powder obtained in step 1) is mixed with calcium chloride solution (30wt%) and an activator (citric acid, nano-titanium dioxide and sulfuric acid in a molar ratio of 20:7:1.5 (wherein citric acid is analytically pure grade; nano-titanium dioxide is analytically pure, with an average particle diameter of 24nm; the concentration of sulfuric acid is 10wt%, and its dosage is based on the introduced H 2 SO 4 According to the mass ratio of 1:5:0.1%, fully mixed, and then left at room temperature (35h; temperature is 30 ℃), to get w...
Embodiment 3
[0042] A light-weight and high-strength assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:
[0043] 1) Fully crush the waste gypsum board with a crusher, then fully grind the crushed gypsum board with a ball mill, pass through a 200-mesh sieve, remove the inert components with larger particle sizes and the protective paper, and sort out the effective group Minute;
[0044] 2) The waste gypsum powder obtained in step 1) is mixed with calcium chloride solution (40wt%) and an activator (citric acid, nano-titanium dioxide and sulfuric acid in a molar ratio of 20:10:2 (wherein citric acid is analytically pure grade; nano-titanium dioxide is analytically pure, with an average particle diameter of 24nm; the concentration of sulfuric acid is 10wt%, and its dosage is based on the introduced H 2 SO 4 ), fully mixed according to the mass ratio of 1:8:0.15%, and then left to stand at room temperature (48h; temperature is 20°C), t...
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