Preparation method for rice husk fireproof plate
A fireproof board and rice husk technology, which is applied in flat products, manufacturing tools, reed/straw treatment, etc., can solve the problems of low fire resistance and easy deformation, and achieve the effects of cheap production cost, low density and controllable process.
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Embodiment 1
[0033] (1) rice husks are pulverized;
[0034] The waste rice husk after grain processing is dried and crushed through an 80-mesh sieve to obtain rice husk powder.
[0035] (2) Soak the pulverized rice husk powder at room temperature in concentrated sulfuric acid with a mass concentration of 98% for 12 minutes; then soak it in a malic acid solution with a mass concentration of 10% and heat and stir until 60° C., keep it warm for 30 minutes, and then Rinse three times with deionized water, and then air-dry the rice husk powder to obtain the treated rice husk powder.
[0036] (3) Add urea and thiourea to the rice husk powder treated in step (2), then add a mixed alkali solution of sodium hydroxide and calcium oxide, heat to 90° C., and react for 2 hours to obtain alkaline treated rice shell powder.
[0037] Among them, the amount of thiourea added is 6.5% of the mass of rice husk powder after treatment, the amount of urea added is 8.0% of the mass of rice husk powder after tre...
Embodiment 2
[0043] (1) rice husks are pulverized;
[0044] The waste rice husk after grain processing is dried and crushed through a 100-mesh sieve to obtain rice husk powder.
[0045] (2) Soak the pulverized rice husk powder at normal temperature in concentrated sulfuric acid with a mass concentration of 98% for 15 minutes; then soak it in a malic acid solution with a mass concentration of 10% and heat and stir until 50° C., keep it warm for 40 minutes, and then Rinse three times with deionized water, and then air-dry the rice husk powder to obtain the treated rice husk powder.
[0046] (3) Add urea and thiourea to the rice husk powder treated in step (2), then add a mixed alkali solution of sodium hydroxide and calcium oxide, heat to 100° C., and react for 1 hour to obtain alkaline-treated rice shell powder.
[0047] Among them, the amount of thiourea added is 5% of the mass of rice husk powder after treatment, the amount of urea added is 10% of the mass of rice husk powder after treatm...
Embodiment 3
[0053] (1) rice husks are pulverized;
[0054] The waste rice husk after grain processing is dried and crushed through a 70-mesh sieve to obtain rice husk powder.
[0055] (2) Soak the pulverized rice husk powder at room temperature in concentrated sulfuric acid with a mass concentration of 98% for 8 minutes; then soak it in a malic acid solution with a mass concentration of 10% and heat and stir until 70° C., keep it warm for 20 minutes, and then Rinse three times with deionized water, and then air-dry the rice husk powder to obtain the treated rice husk powder.
[0056] (3) Add urea and thiourea to the rice husk powder treated in step (2), then add a mixed alkali solution of sodium hydroxide and calcium oxide, heat to 80° C., and react for 3 hours to obtain alkaline-treated rice shell powder.
[0057] Among them, the amount of thiourea added is 10% of the mass of rice husk powder after treatment, the amount of urea added is 6% of the mass of rice husk powder after treatmen...
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