Ammonium Metatungstate Preparation Equipment -- Microwave Heating Furnace
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, China's industrial use of pyrolysis equipment is mainly rotary calciner, at the same time, there are a number of applications in other countries for AMT patented pyrolysis equipment, microwave heating furnace is one of them.
Because the microwave energy level is close to the vibrational level of the water molecule, the hydrous material can dehydrate rapidly under the microwave field, which is also the working principle of the microwave heating furnace.
Microwave heating furnace operating characteristics are: 1. Uniform and fast, which is the main characteristics of microwave drying. As the microwave has a large penetration capacity, heating can be generated directly within the medium heat, and the drying speed; 2. Selective, microwave heating is related to the nature of the material itself, in a certain frequency of the microwave field, because of water dielectric loss larger than other materials, so the moisture content of other dry material than much more heat; therefore, moisture content is much more endothermic than other dry materials; 3. High thermal efficiency, responsive, because the heat directly from the dry material inside, the heat in the surrounding medium loss is minimal, coupled with the microwave heating chamber itself does not absorb heat and the microwave, all the emission effect on the material, high thermal efficiency; 4. Drying thoroughly, the degree of drying materials can be adjusted according to customer requirements, the limit of drying can dry the material to less than 0.5% moisture content. Adopting microwave drying equipment, the drying process is clean and will not cause pollution to the required drying materials.
The pyrolysis time of APT in a single chamber furnace is 6 hours at 150 °C - 250 °C, but the pyrolysis time in the microwave furnace is only 6, 12 minutes, which shows that the pyrolysis rate is fast.
Obviously, the advantages of microwave heating furnace is uniform heating, fast speed, but this technology is difficult to promote the production, the main reason is the large microwave furnace is expensive, the effect of improvement is limited but the cost has increased a lot, so people are more willing to choose lower cost, better effect of other multiple hearth furnace.
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