Ammonium metatungstate solvent extraction is a chemical method for preparing ammonium metatungstate (AMT). The core of this method is to use an organic extractant to extract ammonium ions from ammonium tungstate solution to obtain ammonium metatungstate.
The detailed steps and characteristics of ammonium metatungstate solvent extraction are described below.
Steps of ammonium metatungstate solvent extraction
Mixed organic phase
The ammonium tungstate solution is mixed with an organic extractant (such as di(2-ethylhexyl) phosphate, referred to as D₂EHPA, or tributyl phosphate, referred to as TBP) and kerosene solvent to form an organic phase.
Extracted ammonium ions
The extractant in the organic phase reacts with the ammonium ions in the ammonium tungstate solution and extracts them into the organic phase, reducing the pH value of the solution to 2-4.
Digestion to form ammonium metatungstate solution
After the digestion process, the ammonium ions combine with the tungstate ions to form an ammonium metatungstate solution.
Product preparation
The obtained ammonium metatungstate solution is concentrated, crystallized, filtered, separated and dried to finally obtain the ammonium metatungstate product.
Characteristics of ammonium metatungstate solvent extraction method
High sensitivity and selectivity
The solvent extraction method has high sensitivity and selectivity, and can effectively extract ammonium ions from ammonium tungstate solution.
Simple equipment and rapid operation
The equipment required for this method is relatively simple, and the operation process is also relatively rapid.
Good separation effect
The ammonium ions and impurities can be separated well through extraction, water washing and stripping.
Strong economic benefits
The solvent extraction method can effectively avoid the formation of ammonium paratungstate during cooking, improve the recovery rate and conversion rate, and has strong economic benefits.
Operation precautions of ammonium metatungstate solvent extraction method
The extraction solvent is volatile, flammable and toxic, so it should be used with caution during operation. At the same time, the extractant should have the maximum solubility for the measured component, the minimum solubility for impurities, and be immiscible with the original solvent.
In short, the ammonium metatungstate solvent extraction method is a simple and economical method for preparing ammonium metatungstate, which is widely used in industrial production.
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