The electrodialysis method for ammonium metatungstate smelting production is a method for producing ammonium metatungstate using the principle of electrodialysis. This method mainly involves the use of an electrodialyzer, and the production of ammonium metatungstate is achieved through the following steps:
Raw material preparation
Use ammonium tungstate anolyte with pH=9 as raw material.
Electrodialysis process
Under the action of an applied voltage, ammonium ions enter the circulating cathode liquid through the anion exchange membrane and combine with the anions therein to form an ammonium sulfate solution. During the mass transfer process, the pH value of the excess ammonium ions in the anolyte drops sharply due to the removal of “associated” ions. When the pH value drops to 8.7-8.3, the anolyte becomes turbid due to the formation of insoluble compounds, but these compounds will dissolve again between pH 4-5. When the pH value drops to 3.0, the electrodialysis process stops.
Product recovery
The anolyte is clarified and evaporated into a thick slurry.
Coarse white AMT (ammonium metatungstate) crystals are recovered from it.
The recovery rate of the final product can be higher than 99%.
The advantage of electrodialysis in preparing ammonium metatungstate is that its AMT is made with high purity and recovery rate, and has the potential for research and development. In addition, this method also has the advantages of short process, high direct recovery rate, low energy consumption, and no environmental pollution, so it has good industrial application prospects.
In general, the electrodialysis method for the smelting and production of ammonium metatungstate is an efficient and environmentally friendly method for preparing ammonium metatungstate, which is suitable for industrial production.
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