Method for preparing attapulgite membrane
A technology of attapulgite soil powder and sintering method, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of low efficiency and cumbersome film-forming process, and achieves simplified preparation process and easy control of operating conditions. Effect
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Embodiment 1
[0030] Prepare 140-400 mesh attapulgite and 2g / L sodium hexametaphosphate solution to form a suspension with a mass fraction of 4%, and immerse the ceramic substrate in it for 20s. Place it for 2 days, then put it in the air at room temperature. After it is completely dry, put it in a muffle furnace for sintering at 800°C for 2 hours, take it out after cooling, and repeat the above steps once to obtain the No. 1 attapulgite film. Treat the trisodium phosphate solution and calcium chloride solution with pH=6~8, see Table 1 and Table 2 for the ion rejection rate respectively.
Embodiment 2
[0032] Prepare 140-400 mesh attapulgite and 2g / L sodium hexametaphosphate solution to form a suspension with a mass fraction of 6%, and immerse the ceramic substrate in it for 20s. Place it for 2 days, then place it in the air at room temperature. After it is completely dry, put it in a muffle furnace for sintering at 800°C for 1 hour, take it out after cooling, and repeat the above steps once to obtain the No. 2 attapulgite film. It is used to treat 0.2g / L trisodium phosphate solution and 3g / L calcium chloride solution with pH=6~8, and the ion rejection rates are shown in Table 1 and Table 2 respectively.
Embodiment 3
[0034] Prepare 140-400 mesh attapulgite and 4g / L sodium hexametaphosphate solution to form a suspension with a mass fraction of 6%, immerse the ceramic substrate in it for 30s, and place it in a constant temperature and humidity (25°C, 65%RH) environment Place it for 2 days, and then place it in the air at room temperature. After it is completely dry, put it in a muffle furnace for sintering at 800°C for 2 hours, take it out after cooling, and repeat the above steps once to obtain the No. 3 attapulgite film. It is used to treat 0.2g / L trisodium phosphate solution and 3g / L calcium chloride solution with pH=6~8, and the ion rejection rates are shown in Table 1 and Table 2 respectively.
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