Method for preparing 4A zeolite molecular sieve from opal shale and nitrogen removal application of molecular sieve
A technology of zeolite molecular sieve and opal shale, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of cost increase, large waste acid, pollutants, etc., and reduce waste liquid Pollution, shortening of the preparation process, and the effects of saving preparation costs
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[0041] The method for preparing 4A zeolite molecular sieve as described above, preferably, in step S2, sodium metaaluminate solution is added to SiO 2 with A1 2 o 3 The molar ratio is adjusted to 1.0-3.0.
[0042] According to the above-mentioned method for preparing 4A zeolite molecular sieve, preferably, in step S2, the concentration of the sodium metaaluminate solution is 4-12 mol / L. Preferably, in step S2, opal shale is 1-5 parts by weight, and sodium metaaluminate is 0.5-2 parts by weight.
[0043] Preferably, in step S3, the reaction temperature is 60-130°C, and the reaction time is 6-18h.
[0044] Preferably, in step S4, the turbid liquid obtained in step S3 is centrifuged at 4000-5500 rpm for 2-8 min.
[0045] Preferably, in step S5, the drying temperature is 50-60° C., and the drying time is 12-24 hours.
Embodiment 1
[0047]This embodiment provides a method for preparing 4A zeolite molecular sieve from opal shale, comprising the following steps:
[0048] S1: Weigh 10g of Nenjiang opal shale powder, add 20ml of 1mol / L sodium hydroxide solution, and stir evenly.
[0049] S2: Take 14 mL of the prepared 8.5 mol / L sodium metaaluminate solution, add it to the mixed solution A obtained in step S1, stir evenly, and mix SiO 2 with A1 2 o 3 The molar ratio of is adjusted to 1.25 to obtain mixed solution B.
[0050] S3: Put the mixed solution B obtained in step S2 into a reaction vessel, and conduct a hydrothermal reaction at 90° C. for 4 hours to obtain a cloudy solution.
[0051] S4: After the solution obtained in step 3 is cooled to room temperature, the turbid solution is centrifuged, and the supernatant is discarded to obtain a precipitate.
[0052] S5: drying the precipitate obtained in step S4 at 60° C. for 12 hours to obtain a 4A zeolite molecular sieve made from opal shale.
[0053] The ...
Embodiment 2
[0064] This embodiment provides a method for preparing 4A zeolite molecular sieve from opal shale, comprising the following steps:
[0065] S1: Weigh 15g of Nenjiang opal shale powder, add 15ml of 1mol / L sodium hydroxide solution, and stir evenly.
[0066] S2: Take 14 mL of the prepared 14 mol / L sodium metaaluminate solution, add it to the mixed solution A obtained in step S1, stir evenly, and mix the SiO 2 with A1 2 o 3 The molar ratio of is adjusted to 1.875 to obtain mixed solution B.
[0067] S3: Put the mixed solution B obtained in step S2 into a reaction vessel, and conduct a hydrothermal reaction at 100° C. for 12 hours to obtain a cloudy solution.
[0068] S4: After the solution obtained in step 3 is cooled to room temperature, the turbid solution is centrifuged, and the supernatant is discarded to obtain a precipitate.
[0069] S5: drying the precipitate obtained in step S4 at 60° C. for 12 hours to obtain a 4A zeolite molecular sieve made from opal shale.
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