Ion exchange and solvent extraction, as the two main methods for the preparation of ammonium metatungstate, have their own advantages and disadvantages, and it is impossible to judge which one is “better” simply. The following is a detailed comparison of these two methods:
Ammonium metatungstate ion exchange method
Advantages:
Simple process: Ion exchange method realizes the exchange of ammonium ion and hydrogen ion through ion exchange resin, the process is relatively simple and easy to control.
Good purification effect: the method can effectively remove impurities and improve the purity of ammonium metatungstate.
Short equipment, easy operation: the equipment required for ion exchange method is relatively simple and easy to operate.
Less tungsten loss, high recovery rate: in the process of ion exchange, the loss of tungsten is less and the recovery rate is higher.
Disadvantages:
Possible generation of colloidal tungstic acid: a small amount of colloidal tungstic acid may be generated during the deammoniumization process, which clogs the resin layer and resin micropores.
Increased operation steps: The tungsten liquid entrapped in the resin must be removed, and the resin has to be regenerated with acid, which increases the operation steps.
Wastewater treatment: Ion exchange method produces a large amount of wastewater, which requires appropriate wastewater treatment.
Ammonium metatungstate solvent extraction method
Advantages:
High sensitivity and good selectivity: The solvent extraction method extracts ammonium ion in ammonium metatungstate with organic extractant, which has high sensitivity and selectivity.
Applicable to different raw materials: the method is applicable to the preparation of ammonium tungstate from different raw materials, with greater flexibility.
Disadvantages:
The extraction solvent may be toxic: some organic extractants may be volatile, flammable and toxic, and safety needs to be observed when using them.
Higher cost: the organic extractant used in the solvent extraction method has a higher cost and requires the consumption of a large amount of kerosene solvent.
Complicated operation: Solvent extraction is relatively complicated to operate and requires strict control of the extraction conditions.
Both methods have their own advantages and disadvantages, the choice of which method depends on the specific application scenarios and needs. If the pursuit of process simplicity, good purification effect and high tungsten recovery, ion exchange may be more suitable; while if the raw material is complex and requires high selectivity and sensitivity, solvent extraction may be more suitable. Meanwhile, factors such as cost, environmental protection and safety also need to be considered in practical applications.
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