Although ammonium metatungstate solvent extraction has some obvious advantages in the preparation of ammonium metatungstate, it also has some disadvantages. The following is a detailed analysis of these disadvantages:
Limited separation effect of impurities in the extraction process
A major disadvantage of the solvent extraction method is that although it can extract ammonium ions in ammonium tungstate solution to a certain extent, it cannot effectively separate impurities such as phosphorus, arsenic, silicon, and molybdenum. This means that in the extraction process, a pre-purification process is still required to remove these impurities.
Especially when treating the crystallization mother liquor of APT (ammonium paratungstate), due to the high chloride ion content, these chloride ions cannot be directly returned to the main process, and an auxiliary process is required to recover tungsten trioxide in the crystallization mother liquor.
High requirements for molybdenum content in raw materials
When the ion exchange method is used to produce the crystallization mother liquor of APT (ammonium paratungstate), if the raw material contains molybdenum, the ion exchange method has a poor separation effect on it. Therefore, there are stricter requirements for the molybdenum content in the raw material.
Large energy consumption and water consumption
Although the ion exchange method has a short process and good purification effect, it consumes a large amount of pure water and the amount of wastewater is also large, which increases the energy consumption and water consumption of the entire production process.
Operating conditions and environmental factors
The extraction solvent in the solvent extraction method is usually volatile, flammable and toxic, which requires operators to be particularly careful during the handling process to ensure safe operation.
The selection of the extractant is also critical. It is necessary to ensure that it has the maximum solubility for the measured component, the minimum solubility for impurities, and is immiscible with the original solvent.
Economic cost
Due to the need for additional auxiliary processes and a higher amount of pure water, the solvent extraction method may increase production costs.
In summary, the main disadvantages of the ammonium metatungstate solvent extraction method include limited impurity separation effect, high requirements for the molybdenum content of the raw materials, large energy consumption and water consumption, high requirements for operating conditions and environmental factors, and possible increased economic costs. In practical applications, it is necessary to comprehensively consider these factors and select appropriate production processes and parameters.
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