Method for preparing modified calcium sulfate whisker by using desulfurization gypsum
A technology of calcium sulfate whisker and desulfurization gypsum, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc. The preparation process is green and environmentally friendly, the production cost is low, and the modification effect is good.
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Embodiment 1
[0025] The process steps are as follows:
[0026] ①Sieving: Sieve the desulfurized gypsum with a 0.08mm sieve to remove impurities such as sand and stones in the desulfurized gypsum. Impurities are treated as solid waste.
[0027] ②Pulping: Weigh 500g of desulfurized gypsum after sieving, measure 10L of tap water with a measuring cylinder, then mix the prepared desulfurized gypsum with water, adjust the pH value of the solution to 5 with NaOH and HCl, and finally stir it with a mixer for 20 Second.
[0028] ③ Hydrothermal reaction: Put the stirred slurry in a high-pressure reactor, control the reaction temperature to 125°C, the pressure corresponding to the temperature is about 0.232Mpa, and the holding time is 300min;
[0029] ④ Whisker surface modification: Add 0.05% of desulfurized gypsum weight acrylic acid-maleic acid copolymer and 2% sodium lauryl sulfate to the high-pressure reactor, and keep it warm for 60 minutes;
[0030] ⑤ Dehydration: Use a centrifuge to separat...
Embodiment 2
[0035] The process steps are as follows:
[0036] ①Sieving: Sieve the desulfurized gypsum with a 1.18mm sieve to remove impurities such as sand and gravel in the desulfurized gypsum. Impurities are treated as solid waste.
[0037] ②Pulping: Weigh 3300g of desulfurized gypsum after sieving, measure 10L of tap water with a measuring cylinder, then mix the prepared desulfurized gypsum with water, adjust the pH value of the solution to 10 with NaOH and HCl, and finally stir it with a mixer for 60 Second.
[0038] ③ Hydrothermal reaction: Put the stirred slurry in a high-pressure reactor, control the reaction temperature to 180°C, and the pressure corresponding to the temperature is 1.052Mpa, and the holding time is 30min;
[0039] 4. whisker surface modification: add desulfurization gypsum weight 0.3% potassium oleate in autoclave, insulation 40min;
[0040] 5. dehydration: calcium sulfate whisker and water are carried out solid-liquid separation with centrifuge, make the moist...
Embodiment 3
[0044] The process steps are as follows:
[0045] ①Sieving: Sieve the desulfurized gypsum with a 1.18mm sieve to remove impurities such as sand and stones in the desulfurized gypsum. Impurities are treated as solid waste.
[0046]②Pulping: Weigh 1000g of the sieved desulfurized gypsum, measure 10L of tap water with a measuring cylinder, then mix the prepared desulfurized gypsum with water, adjust the pH value of the solution to 7 with NaOH and HCl, and finally stir it with a mixer at 120 Second.
[0047] ③ hydrothermal reaction: place the stirred slurry in a high-pressure reactor, control the reaction temperature to be 130°C, and the pressure corresponding to the temperature is 0.270Mpa and the holding time is 150min;
[0048] ④ Whisker surface modification: add sodium tetradecyl sulfate with 5% weight of desulfurized gypsum into the autoclave, and keep it warm for 60 minutes;
[0049] 5. dehydration: calcium sulfate whisker and water are carried out solid-liquid separation...
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