The thermal degradation method is a process for the preparation of ammonium metatungstate based on ammonium paratungstate (APT).
This method is also the mainstream process of preparing ammonium metatungstate (AMT). At present, the pyrolysis equipment used in China is mainly rotary calciner. At the same time, there are many kinds of patented pyrolysis equipment used in AMT abroad, and the plate type multiple hearth furnace is one of them.
The plate type multiple furnace is composed of a multi-layer drying plate separated from each other, and the material is in continuous contact with the pyrolysis plate. It is characterized by the fact that the solid can be conveyed by low-speed air or low-speed steam to avoid excessive dust.
The furnace has a wide range of particle size control, and even includes a very fine particle size, the machine's feed is completed by the bucket wheel, feeding position is in the top of the plate dryer, the material to be pyrolyzed may be wet or dry flakes, and the pyrolysis material flows from top to bottom. The concrete process is that the material is rotated from the edge of the first plate to the middle of the rotating harrow mechanism, and then slid to the edge of the second layer, and then harrow to the center, so that the cycle is completed until the whole drying process is completed. Each plate is controlled by heating, and there is a certain temperature gradient between the plates to meet the requirements of process parameters and product quality. The exhaust gas is carried out by the air stream, and the heat carrier can be steam, hot water or other mediums.
The advantages of the plate type multiple hearth furnace are that it can be fed by wet material, and the drying process is carried out in the completely sealed box. The labor condition is better, and the pollution of the dust leakage to the environment is avoided; Material flow movement, heat and mass exchange uniformity, sufficient, high production efficiency, good drying consistency, good product quality, material particles in the dryer vibration is relatively slight, the material is not easily broken.
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