A method of using papermaking white mud to produce hot-pressed composite boards
A technology for paper-making lime mud and composite board, which is applied in sustainable waste treatment, solid waste management, climate sustainability and other directions, can solve the problem of difficult breakthrough in the utilization of paper-making lime mud, and achieves suitable promotion and application and low production cost. Effect
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Embodiment 1
[0026] A method for producing hot-pressed composite boards utilizing papermaking white mud, the method comprising the steps of:
[0027] (1) Modification treatment
[0028] (1.1) Modification treatment of papermaking white mud
[0029] Dry the papermaking lime mud to the balance weight, crush and sieve to obtain lime mud powder with an average particle size of 10 μm; put the above lime mud powder into a closed container, pass in carbon dioxide gas with a concentration of 99.8%, and keep the closed container at room temperature The internal pressure is 0.15-0.65MPa. After holding the pressure for 5 hours, dry the de-alkalized lime clay powder at 105±3°C for 12 hours to obtain de-alkalized lime clay powder;
[0030] (1.2) Glass fiber pretreatment and phenolic resin modification treatment
[0031] Mix water and absolute ethanol at a volume ratio of 1:4 to form an ethanol aqueous solution; at room temperature, dissolve KH550 in the above ethanol aqueous solution at a volume rati...
Embodiment 2
[0036] A method for producing hot-pressed composite boards utilizing papermaking white mud, the method comprising the steps of:
[0037] (1) Modification treatment
[0038] (1.1) Modification treatment of papermaking white mud
[0039] Dry the papermaking lime mud to the balance weight, crush and sieve to obtain lime mud powder with an average particle size of 10 μm; put the above lime mud powder into a closed container, pass in carbon dioxide gas with a concentration of 99.8%, and keep the closed container at room temperature The internal pressure is 0.45-0.65MPa. After holding the pressure for 4 hours, dry the de-alkalized lime clay powder at 105±3°C for 12 hours to obtain de-alkalized lime clay powder;
[0040] (1.2) Glass fiber pretreatment and phenolic resin modification treatment
[0041]Mix water and absolute ethanol at a volume ratio of 1:4 to form an ethanol aqueous solution; at room temperature, dissolve KH550 in the above ethanol aqueous solution at a volume ratio...
Embodiment 3
[0047] A method for producing hot-pressed composite boards utilizing papermaking white mud, the method comprising the steps of:
[0048] (1) Modification treatment
[0049] (1.1) Modification treatment of papermaking white mud
[0050] Dry the paper-making lime mud at 105°C to the constant weight, crush and sieve to obtain lime mud powder with an average particle size of 10 μm; put the above-mentioned lime mud powder into a closed container, pass in carbon dioxide gas with a concentration of 99.8%, and keep it at room temperature. The pressure inside the airtight container is 0.55-0.65 MPa. After keeping the pressure for 4 hours, dry the de-alkalized lime clay powder at 105±3°C for 12 hours to obtain de-alkalized lime clay powder;
[0051] (1.2) Glass fiber pretreatment and phenolic resin modification treatment
[0052] Mix water and absolute ethanol at a volume ratio of 1:4 to form an ethanol aqueous solution; at room temperature, dissolve KH550 in the above ethanol aqueous...
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