Application of self-supporting li-abw molecular sieve membrane for separation of calcium ions in hard water
A molecular sieve, self-supporting technology, applied in semi-permeable membrane separation, membrane technology, descaling and water softening, etc., can solve the problem of no relevant reports on the method for separating calcium ions, etc., and achieves convenient operation, simple device and low cost. low cost effect
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preparation example Construction
[0027] The preparation method of self-supporting Li-ABW molecular sieve membrane is carried out according to the method of Chinese patent application (application number: 201810126623.1), namely:
[0028] The raw materials are CFB fly ash, white carbon black, lithium hydroxide and deionized water, among which, the mass ratio of CFB fly ash, white carbon black, lithium hydroxide and deionized water is 1:0.18:0.1~0.12:0.96 ~1.
[0029] (1) CFB fly ash was purchased from Shenhua Zhuneng Group Co., Ltd. Dry before use and grind for 30 seconds with a vibrating mill. The main oxide composition of CFB fly ash (mass percentage): SiO 2 (35.14%), CaO (2.86%), Al 2 o 3 (45.35%), Na 2 O (0.08%), MgO (0.23%), K 2 O (0.34%), Fe 2 o 3 (2.61%), TiO 2 (1.82%), P 2 o 5 (0.12%), SO 3 (0.54%), LOI (10.91%).
[0030] (2) White carbon black (precipitation method), purchased from Shanghai Beimo Industrial Co., Ltd., white powder, SiO 2 Content ≥ 90%, specific surface area: 200m 2 / g. ...
Embodiment 1
[0049] (1) Take a self-supporting Li-ABW molecular sieve membrane with a diameter of 40mm and a thickness of 4mm ( figure 1 Figure a), fixed in the Buchner funnel with an O-ring.
[0050] (2) According to figure 2 Assembled the membrane separation device as shown.
[0051] (3) Calibrate the pure water flux of the self-supporting Li-ABW molecular sieve membrane under different pressure differences, the results are shown in Table 1, and then dry the membrane.
[0052] (4) Prepare 200mg / L of CaCl 2 solution as simulated hard water.
[0053] (5) Add simulated hard water into a Buchner funnel sealed with a self-supporting Li-ABW molecular sieve membrane, turn on the vacuum pump, and adjust the pressure difference to 0.06 MPa with a buffer device.
[0054] (6) Collect the permeate and use ICP-OES to detect Ca in the filtrate 2+ The concentration is 0.37mg / L, and the separation efficiency is 99.8%.
[0055] Table 1: Pure water flux (kg / m 2 h)
[0056]
Embodiment 2
[0058] (1) Take a self-supporting Li-ABW molecular sieve membrane with a diameter of 40mm and a thickness of 6mm ( figure 1 Figure b), fixed in the Buchner funnel with an O-ring.
[0059] (2) According to figure 2 Assembled the membrane separation device as shown.
[0060] (3) Calibrate the pure water flux of the self-supporting Li-ABW molecular sieve membrane under different pressure differences, the results are shown in Table 1, and then dry the membrane.
[0061] (4) Prepare 400mg / L of CaCl 2 solution as simulated hard water.
[0062] (5) Add simulated hard water into a Buchner funnel sealed with a self-supporting Li-ABW molecular sieve membrane, turn on the vacuum pump, and adjust the pressure difference to 0.06 MPa with a buffer device.
[0063] (6) Collect the permeate and use ICP-OES to detect Ca in the filtrate 2+ The concentration is 0.29mg / L, and the separation efficiency is 99.9%.
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