As an important method of preparing ammonium metatungstate hydrate, ion exchange method has the advantages of short process, simple equipment, good purification effect, easy operation and high tungsten recovery rate. However, its shortcomings should not be ignored, such as the raw material liquid needs to be diluted high times, the amount of wastewater is large, and the mother liquor of APT crystallization can not be returned directly to the main process. In practical application, it is necessary to consider the advantages and disadvantages according to the specific situation and choose the most suitable preparation method. The advantages and disadvantages of ion exchange method for the preparation of ammonium metatungstate hydrate can be summarized as follows.
Advantages of preparing ammonium metatungstate hydrate by ion exchange method
Short process, simple equipment
Ion exchange method can realize tungsten extraction and transformation through simple ion exchange process, compared with other methods, such as extraction method, the process is shorter and the equipment is simpler.
Good purification effect
Ion exchange method can effectively remove impurities in the solution and improve the purity of the product. Simple operation and easy control: the operation of this method is relatively simple and easy to control, and high quality ammonium metatungstate hydrate can be prepared stably.
High tungsten recovery
Ion exchange method has high tungsten recovery rate and can effectively utilize tungsten resources.
Good labor environment
Compared with other methods, the operation environment of ion exchange method is more friendly and less corrosive to equipment and plant.
Disadvantages of the preparation of ammonium metatungstate hydrate by ion exchange method
The raw material liquid needs to be highly diluted
The ion exchange method requires a low concentration of WO3 in the raw material liquid, so the raw material liquid needs to be diluted high times, which increases the consumption of water.
Large amount of wastewater
In the ion exchange process, a large amount of wastewater is generated, which increases the difficulty and cost of wastewater treatment.
APT crystallization mother liquor cannot be directly returned to the main process
In the crystallization mother liquor of APT (ammonium paratungstate) produced by ion exchange method, the content of chlorine ions is high, which can not be returned to the main process directly, and it is necessary to set up another auxiliary process to recover tungsten trioxide in the crystallization mother liquor.
High molybdenum content requirements for tungsten mineral raw materials
Ion exchange method has high requirements on the molybdenum content of tungsten mineral raw materials, which limits the choice of raw materials.
Cost problem
Although the ion exchange method has the advantages of short process and simple equipment, with the decreasing of tungsten resources and the improvement of environmental protection requirements, the rising price of raw materials and the increasing cost of wastewater treatment make the cost of the ion exchange method rise gradually.
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