Device and method for continuous recovery of ammonianitrogen from aluminum ash

A method for continuous recovery of ammonia nitrogen from aluminum ash, characterized in that the method is applicable to a device for continuous recovery of ammonia nitrogen from aluminum ash,

• wherein the device comprises a reaction kettle, a steam generator, and a feeder, wherein the steam generator and the feeder are both mounted on the reaction kettle, the steam generator is configured to deliver steam into the reaction kettle, and the feeder is configured to deliver aluminum ash into the reaction kettle;
• wherein the device further comprises an intersection dispersion assembly, the intersection dispersion assembly is installed inside the reaction kettle and is configured to intersect and disperse the steam and aluminum ash;
• the intersection dispersion assembly comprises a dispersion surface, the dispersion surface is provided inside the reaction kettle for dispersing the mixture of steam and aluminum ash;
• a dispersion plate and a guide tube, wherein the dispersion plate is provided inside the reaction kettle, a docking slot is formed on a side of the dispersion plate facing the dispersion surface, the dispersion plate is fitted with the dispersion surface with a gap, the docking slot is in communication with the feeder via a pipeline, the feeder is a pneumatic conveyor, the guide tube is fixedly mounted on the side wall of the dispersion plate, the guide tube is in communication with the steam generator, and the guide tube is perforated evenly inside the reaction kettle;
• a heating chamber, wherein the heating chamber is provided inside the reaction kettle and corresponds to the dispersion surface, heat conduction is performed between the heating chamber and the dispersion surface, and the heating chamber is in communication with the steam generator;
• a cyclic motion assembly, wherein the cyclic motion assembly is installed inside the reaction kettle and is configured to control the cyclic relative movement between the dispersion plate and the dispersion surface, wherein the method comprises the following steps:
• S1:
• delivering aluminum ash particles ground by a ball mill into the docking slot via the feeder, and delivering saturated steam generated in the steam generator into the guide tube;
• S2:
• starting the drive motor to drive the helical blade to rotate and move axially, and in one complete cycle, the guide tube and the dispersion plate sequentially form a water vapor layer and an aluminum ash layer on the two dispersion surfaces, allowing uniform contact between the aluminum ash and water;
• S3:
• meanwhile, under the continuous heat exchange effect of the steam inside the heating chamber, heating the water vapor and aluminum ash on the dispersion surface, causing the aluminum ash to react with water, and after the reaction, excess water vapor is evaporated;
• S4:
• starting from the second cycle, during an movement of the dispersion plate, the scraper mounted on its end face scraping off the aluminum ash from the dispersion surface and lays down a new water vapor layer and aluminum ash layer;
• S5:
• the scraped aluminum ash, after fragmentation, falling into the collection box and being conveyed to the next-stage dispersion plate by the circulation pipe and the feeder, undergoing multiple cycles of mixing and dispersion with the steam, until the aluminum ash is completely reacted.