Method for preparing modified calcium sulfate crystal whisker papermaking filler
A technology of calcium sulfate whiskers and papermaking fillers, applied in the field of papermaking, can solve the problems of reduced operating performance of paper machines, difficult dispersion, wear and tear of paper machine equipment, etc., and achieves the effects of expanding application fields, solving solid pollution, and improving added value.
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Embodiment 1
[0017] 100g calcium sulfate whiskers with purity ≥99% and whiteness ≥90%ISO extracted from desulfurized gypsum are calcined at 350℃ for 3 hours, taken out, grind and deflocculated to 5-40μm; at 500 rpm The whiskers after calcination and deflocculation were prepared into a suspension with a mass concentration of 10% under stirring, and 3% titanate modifier dissolved in alcohol was added for organic modification, and reacted at 60°C for 30 minutes; The modified calcium sulfate whiskers are dried at 100°C for 3 hours at a constant temperature, taken out, ground and deflocculated to an average length of 5-40μm, and the density is 2.3-2.4g / cm. 3 , Whiteness ≥ 90% ISO, solubility ≤ 0.5%, high whiteness, low solubility, high retention rate modified calcium sulfate whisker papermaking filler.
Embodiment 2
[0019] 100g calcium sulfate whiskers with purity ≥99% and whiteness ≥90%ISO extracted from the phosphogypsum waste residue are calcined at 375℃ for 2.5 hours, taken out, ground and deflocculated to 5-40μm; at 650 revolutions / min Mix the calcined and deflocculated whiskers into a suspension with a mass concentration of 15% under stirring at a rotating speed, add 4% titanate modifier dissolved in alcohol for organic modification, and react at 75°C for 20 minutes; Take out the modified calcium sulfate whiskers, place them at 125°C for constant temperature drying for 2.5 hours, take them out, grind and deflocculate to an average length of 5-40μm, and obtain a density of 2.3-2.4g / cm 3 , Whiteness ≥ 90% ISO, solubility ≤ 0.5%, high whiteness, low solubility, high retention rate modified calcium sulfate whisker papermaking filler.
Embodiment 3
[0021] 100g calcium sulfate whiskers with purity ≥99% and whiteness ≥90%ISO extracted from nickel ore smelting waste residue are calcined at 400℃ for 2 hours, taken out, ground and deflocculated to 5-40μm; at 800 rpm Mix the whiskers after calcining and deflocculating into a suspension with a mass concentration of 20% under the condition of stirring at a speed of 1 minute, add 5% titanate modifier dissolved in alcohol for organic modification, and react at 90°C for 15 minutes ; Take out the modified calcium sulfate whiskers, place them at 150℃ for constant temperature drying for 2 hours, take them out, grind and deflocculate to an average length of 5-40μm, you can get a density of 2.3-2.4g / cm 3 , Whiteness ≥ 90% ISO, solubility ≤ 0.5%, high whiteness, low solubility, high retention rate modified calcium sulfate whisker papermaking filler.
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