The ion exchange method in ammonium metatungstate smelting production is an important production process. The following is a detailed introduction to the method:
Raw materials and process
Raw materials: This method mainly uses ammonium tungstate solution or ammonium paratungstate as raw materials.
Process: The main mechanism of the ion exchange method is to use H+ in strong acid or weak acid H+ type cationic resin to exchange ions with NH4+ in the solution. Under the condition of pH 3.5, H+ enters the solution and then boils at 98℃ for 5 hours to convert ammonium tungstate into a stable ammonium metatungstate solution.
Subsequent treatment
Evaporation and concentration: The converted ammonium metatungstate solution is evaporated and concentrated.
Freeze crystallization or spray drying: The concentrated solution can be used to obtain AMT (ammonium metatungstate) crystals by freeze crystallization or spray drying.
Resin treatment
Resin regeneration: The resin saturated with NH4+ can be regenerated by hydrochloric acid solution and then recycled.
Advantages and characteristics
The process is relatively simple and easy to control.
It can avoid the formation of APT (which may refer to other forms of tungsten compounds) and will not introduce new pollutants.
The process is continuous and easy to realize automated production.
Disadvantages and precautions
A small amount of colloidal tungstic acid may be generated during the deammoniation process, which may block the resin layer and resin micropores.
The tungsten liquid entrained in the resin must be removed, and the resin needs to be regenerated with acid, which increases the operation steps.
Other information
The ion exchange method is one of the mainstream processes for preparing ammonium metatungstate.
Some scholars have proposed a new method for preparing high-purity ammonium metatungstate using cation exchange technology under low pH conditions.
In summary, the ion exchange method in the smelting production of ammonium metatungstate is a process method for preparing ammonium metatungstate by using the principle of ion exchange, using ammonium tungstate solution or ammonium paratungstate as raw materials, through specific chemical reactions and subsequent treatment steps.
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