TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The working process of the device comprises: drying lysine and other amino acid dust on the fluidized bed through the induced draft fan, conveying into the recovery tower through the inlet, passing water to the water spraying support on the water sprinkler through the water inlet, spraying water and dust into the recovery tower through water sprinklers, where based on the different quality of dust will be flowing into the recovering tower, encountering the water by the multiple of water sprinkler, which enables increase in the quality of lysine and other amino acids lead to lower layer until falling into the material receiving bins, which is funnel shaped, passing the water from the drain port through the membrane filter, again conveying water into the water spraying support on the water sprinkler through the circulating pump, discharging the remaining water through the water outlet, when the pressure in the recovering tower is too low then again adding water through water inlet, and repeating the above steps. Preferred Components: One end of the induced draft fan is connected with a fluidized bed, and the other end is connected with the inlet of the recovery tower. The material receiving box is set on the lower part of the recovery tower. The material receiving box is triangular funnel shape, and the corner angle of the lower end is provided with a membrane filter, which is used for collecting the material. The water inlet is connected with the water spraying support in the inner part of the recovery tower through a guide pipe. There are 4-6 water spraying supports, which are arranged in line, and are set in recovery tower from up to down, where the upper part is provided with 2-5 water sprinklers, the openings of the 1-3 water sprinklers on the upper parts are upwards, the openings of the 1 -3 water sprinklers on the lower parts are downwards, and the middle part of the returning liquid outlet and the lower part of 1-3 lines are fixed and connected through the recovery tower. The upward inclined angle of the inlet and its opening is 45 degrees .