Mesoporous-aluminosilicate-based shaping phase change material prepared from fly ash and preparation method thereof
A technology of phase change materials and aluminosilicates, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of fly ash dependence and restrict the development of traditional energy industries, and achieve continuous load, low leakage rate, High heat storage efficiency
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[0036] Such as figure 1 As shown, a method for preparing an aluminosilicate-based shaped phase change material prepared from fly ash according to the present invention includes the steps:
[0037] Step 1): Mix the fly ash with one or more of alkali metal or alkaline earth metal carbonates, hydroxides or oxides and then roast them at a high temperature, and quench the roasted products;
[0038] Step 2): Grind the quenched roasted sample prepared in step 1) and perform a solid-liquid reaction with an acid solution;
[0039] Step 3): After the solid-liquid reaction is completed, the solid powder obtained by the solid-liquid separation is dried to obtain mesoporous aluminosilicate powder;
[0040] Step 4): Put the mesoporous aluminosilicate powder prepared in step 3) under vacuum and maintain the same temperature as the phase change temperature of the supported phase change material, and then charge an excess of the molten phase Change the material, make the mixture, and continue to maint...
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[0044] Example 1
[0045] Step 1): After mixing sodium carbonate and fly ash at a mass ratio of 30:100, roasting at 870°C for 45 minutes, and quenching the roasted product;
[0046] Step 2): Grind the quenched roasted powder prepared in step 1) and react with 20% HCl acid solution at 25°C for 15 minutes;
[0047] Step 3): After the solid-liquid reaction is completed, the solid powder obtained by solid-liquid separation is dried to obtain mesoporous aluminosilicate powder with wedge-shaped pores, and the ratio of aluminum to silicon moles in the obtained product is 0.7:1;
[0048] Step 4): Put the wedge-shaped mesoporous aluminosilicate powder prepared in step 3) under a vacuum of 30kPa, and maintain the phase change material lauric acid, myristic acid and stearic acid (LA- PA-SA) The eutectic phase transition temperature is 31.76℃, and then it is filled with excess lauric acid in the molten state. The mixture is prepared after 30 minutes, and the vacuum of 30kPa is maintained for 30 m...
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[0051] Example 2
[0052] Mix 1 part of calcium carbonate with 0.5 part of sodium hydroxide, mix the mixture with fly ash in a mass ratio of 50:100, and then roast at 1150°C for 60 minutes, and then quench the roasted product;
[0053] Step 2): Grind the quenched roasted powder prepared in step 1) and react with 20% HCl acid solution at 60°C for 60 minutes;
[0054] Step 3): After the solid-liquid reaction is completed, the solid powder obtained by solid-liquid separation is dried, and the product with the molar ratio of aluminum to silicon in the obtained product is about 4:1 to obtain mesoporous aluminum-silicon with plate-shaped pores Salt powder
[0055] Step 4): Place the flat-porous mesoporous aluminosilicate powder prepared in step 3) under a vacuum of 80kPa and maintain the eutectic phase transition temperature of lauric acid and myristic acid of 33.62 with the supported phase change material. ℃ the same temperature, and then filled with excess molten lauric acid and myristic...
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