Referring to the experience of thermal decomposition of APT and APT-neutralization far-infrared treatment of APT, each batch of 1kg APT is mixed with 40 grams of ammonium citrate. APT weight loss 5.4-6%. The process flow is shown in the figure. If the thermal dissociation temperature and the residence time of the material in the furnace are properly controlled, the color of the dissociated material obtained is earthy, and the APT→AMT conversion rate is greater than 98%. The thermal dissociation should immediately form a slurry, add an appropriate amount of ammonia water, and control the pH value at 3- 4 range, then constant temperature aging and digestion (temperature not exceeding 90°C), concentration, filtration and direct cooling to crystallize, but AMT can also be produced by atomization.
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