Method for preparing 13x molecular sieve and high-silica mordenite from fly ash acid extraction residue and utilization method of fly ash
A technology for extracting aluminum residues and mordenite, which is applied in the directions of fajhedral crystalline aluminum silicate zeolite, mordenite crystalline aluminum silicate zeolite, chemical instruments and methods, etc., to achieve considerable environmental benefits and efficient resource utilization.
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preparation example 1
[0080] This preparation example illustrates the preparation of fly ash to obtain the aluminum extraction residue of fly ash acid method.
[0081] Take 100g of fly ash, add 5mol / L hydrochloric acid solution, stir and react at 150°C for 30min, filter and wash to obtain aluminum-rich solution and fly ash acid extraction aluminum residue.
[0082] The chemical composition of the fly ash acid extraction aluminum residue is shown in Table 2.
preparation example 2
[0084] This preparation example illustrates the preparation of 13X molecular sieve seed crystals.
[0085] Using sodium silicate as silicon source and sodium aluminate as aluminum source, add water to configure 13X molecular sieve hydrothermal crystallization mother liquor. The composition (molar ratio) of hydrothermal crystallization mother liquor is SiO 2 :Al 2 o 3 :Na 2 O:H 2 O=5:1:1.5:50.
[0086] The above mother liquor was transferred into a hydrothermal reaction kettle, and the hydrothermal reaction was allowed to stand at 95° C. for 20 h.
[0087] The product after the reaction is filtered, washed and dried to obtain pure 13X molecular sieve solid powder, which is used as the 13X molecular sieve seed crystal in the present invention. .
[0088] The average particle size of the 13X molecular sieve seed crystal is 1-3 μm, and the silicon-aluminum ratio is 3.
Embodiment 1
[0090] (1) Add 50g of fly ash acid extraction aluminum residue to Na 2 CO 360g of solid powder, mixed and ground, roasted at 860°C for 90 minutes, cooled rapidly in air after the roasting, and crushed to below about 200 mesh to obtain roasted slag;
[0091] (2) After the roasted slag material is subjected to dry magnetic separation to remove iron, take 70g and add 140ml of deionized water (the amount of water is 200ml relative to 100g of roasted slag material), and carry out water immersion at 100°C and normal pressure for 20min , leaching and dissolving Na in the roasted slag 2 SiO 3 and NaAlSiO 4 , to obtain a solid-liquid mixed water immersion product; where the solid is dissolved Na 2 SiO 3 and NaAlSiO 4 The remaining product after; the liquid is containing Na 2 SiO 3 and NaAlSiO 4 The solution;
[0092] (3) Under high-speed stirring state, get whole water immersion product 100g (convert to containing 70g of calcined slag material), add sodium carbonate solution ...
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