| CPC B01J 20/3214 (2013.01) [B01D 53/02 (2013.01); B01J 20/041 (2013.01); B01J 20/06 (2013.01); B01J 20/103 (2013.01); B01J 20/28004 (2013.01); B01J 20/3021 (2013.01); B01J 20/3035 (2013.01); B01J 20/3078 (2013.01); B09B 3/40 (2022.01); C23C 16/406 (2013.01); C23C 16/56 (2013.01); F23J 15/02 (2013.01); B01D 2253/106 (2013.01); B01D 2253/1124 (2013.01); B01D 2253/25 (2013.01); B01D 2257/2045 (2013.01); F23G 2208/00 (2013.01)] | 13 Claims |
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1. A method for preparing a chlorine adsorption material for use in waste incineration, wherein the chlorine adsorption material adsorptive for chlorine-based substances is prepared by mixing natural iron ores and quartz stones, and then adding CaO to a mixed system to modify the natural iron ores and the quartz stones through ultrasonic impregnation; and the method specifically comprises the following Steps:
(1) preparing iron ore powder, to be specific: putting the natural iron ores into a grinder and grinding the natural iron ores, and then sieving the ground natural iron ores to obtain the iron ore powder with a particle size of 0.2-0.3 mm;
(2) preparing SiO2, to be specific: placing the quartz stones in a tablet press to press the quartz stones into powder, then drying and dehydrating the resulting powder, and then sieving the dried powder through a 60-100-mesh sieve to obtain SiO2 powder;
(3) preparing a SiO2—Fe2O3 carrier, to be specific: with a chemical vapor deposition method, placing the SiO2 powder prepared in Step (2) in a quartz tube of a chemical vapor deposition device, then weighing the iron ore powder prepared in Step (1) at a ratio of 1:1.7-2.7 of the SiO2 powder to the iron ore powder, and placing the weighed iron ore powder in a sublimator of the chemical vapor deposition device, wherein the quartz tube is vertically arranged opposite to and communicated with the sublimator, and the quartz tube is internally provided with a platform for the placement of the SiO2 powder; introducing air into the quartz tube which is kept at a vacuum degree of 0.08 MPa, so that the SiO2 powder is in a fluidized state; then, heating the quartz tube to 200° C. to remove water in the SiO2 powder and holding for 2-3 h; heating the quartz tube to 400° C. and holding; then, introducing nitrogen into the sublimator and regulating the temperature within the sublimator to 110° C.; after the iron ore powder sublimates completely, regulating the temperature of the sublimator to 400° C., so as to form a reaction chamber by the sublimator and the quartz tube and allow the SiO2 powder in the fluidized state to be fully mixed with the sublimated iron ore powder; holding the reaction chamber at 400° C. for 2 h, to allow iron and an iron compound on the carrier formed from the SiO2 powder and the iron ore powder to be completely oxidized, then cooling the carrier to room temperature, drying the carrier at the room temperature and grinding the carrier into powder; and finally, placing the powder in a tubular furnace, heating to 400° C. at a rate of 3° C.min−1 and holding for 1-2h, thereby obtaining the SiO2—Fe2O3 carrier;
(4) preparing a solution with Ca(NO3)2.4H2O as a precursor at a solid-to-liquid ratio of 0.4-1.2 Kg/L;
(5) adding the solution prepared in Step (4) to a water tank of an ultrasonic cleaner, and then adding the SiO2—Fe2O3 carrier prepared in Step (3) to the water tank for ultrasonic mixing for 6-9 hours; and
(6) calcining the SiO2—Fe2O3 carrier treated in Step (5) at a temperature of 900° C. to remove NOx on surface attachments thereof and prepare CaO; modifying the SiO2—Fe2O3 carrier by CaO; then, cooling the modified SiO2—Fe2O3 carrier to room temperature; grinding the cooled SiO2—Fe2O3 carrier to a particle size of 0.1-0.2 mm, thereby obtaining the chlorine adsorption material.
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