The steps of ammonium metatungstate electrodialysis mainly include the following stages:
Raw material preparation
Prepare ammonium tungstate anolyte with pH = 9 as raw material. Ensure that the quality and concentration of the raw materials meet the production requirements.
Electrodialysis process
Apply a DC electric field to the electrodialyzer to form a directional electric field in the membrane stack.
Under the action of the electric field, water molecules dissociate into H+ and OH-, and migrate to the salt chamber and the alkali chamber respectively.
Ammonium ions (NH4+) enter the cathode liquid through the anion exchange membrane and combine with the anions therein to form an ammonium sulfate solution.
As the electrolysis process proceeds, ammonium ions in the anolyte continue to migrate out, causing the pH value to drop sharply. When the pH value drops to a specific range (such as 8.7-8.3), the anolyte may become turbid due to the formation of insoluble compounds, but these compounds will dissolve again between pH values 4-5.
When the pH value further drops to 3.0, the electrolysis process stops.
Product recovery and purification
The anolyte is clarified and evaporated into a thick slurry.
Coarse white ammonium metatungstate (AMT) crystals are recovered from it.
The recovered AMT crystals can be further purified by centrifuges, filters and other equipment to remove residual impurities and solutions.
Operation parameter adjustment
According to experimental or production experience, adjust and optimize the voltage, current density, time, temperature and other parameters in the electrodialysis process to obtain the best AMT crystal yield and quality.
Quality inspection
The produced AMT crystals are quality inspected, including purity, crystallinity, particle size distribution and other indicators.
According to the test results, timely adjust and optimize production parameters to ensure stable product quality.
In addition, during the electrodialysis process, the following points should be noted:
Ensure the normal operation and maintenance of the electrodialyzer to avoid equipment failure affecting production.
Monitor key parameters such as the concentration and pH value of raw materials and products to ensure that they are within the appropriate range.
Comply with safety operating procedures to ensure safety during production.
In summary, the ammonium metatungstate electrodialysis method achieves the goal of efficiently and environmentally friendly preparation of ammonium metatungstate crystals from ammonium tungstate anolyte through steps such as raw material preparation, electrodialysis process, product recovery and purification.
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