The key steps in the production process of ammonium metatungstate hydrate can be summarized as follows:
Preparation of raw materials
Use ammonium paratungstate as raw material to ensure that the purity and quantity of the raw material meet the production requirements.
Heating and Conversion
Ammonium paratungstate is heated and processed at a temperature of 130 to 140°C for 1 to 8 hours.
The heated product is blended into a slurry to prepare for the subsequent boiling process.
Boiling
The slurry was boiled at a temperature of 80 to 100°C for 2 to 6 hours.
This step is to further promote the reaction to produce ammonium metatungstate solution.
Control of acidity of effluent
The acidity of the effluent needs to be strictly controlled to a pH value of about 3.5.
The acidity control is crucial for the subsequent reaction to ensure that the ammonium tungstate can be converted into a stable ammonium metatungstate solution.
Cooking
The ammonium metatungstate solution is boiled at 98°C for 5 hours.
This step ensures the complete conversion of ammonium tungstate to ammonium metatungstate.
Evaporation and concentration
The boiled ammonium metatungstate solution is evaporated and concentrated to remove excess water and increase the concentration of the solution.
Crystallization and Drying
The ammonium metatungstate in the solution is precipitated into crystals by cooling and crystallization.
Alternatively, spray drying method is used to spray the solution into fine droplets, which are rapidly dried into powder under high temperature.
Separation by filtration and drying
If the method of cooling crystallization is used, the crystals are filtered and separated to remove impurities in the solution.
The separated crystals are dried to get dry ammonium metatungstate hydrate.
Product Inspection and Packing
Conduct quality inspection on the produced ammonium metatungstate hydrate to ensure that it meets the relevant standards and requirements.
After passing the inspection, the product is packed for storage and transportation.
Resin regeneration (optional step)
If ion exchange resin is used for production, the resin saturated by NH4+ needs to be regenerated by hydrochloric acid solution.
The regenerated resin can be recycled to reduce production costs.
These key steps together constitute the production process of ammonium metatungstate hydrate, and each step has an important impact on the quality and yield of the final product. Therefore, in actual production, the operating conditions and parameters of these steps need to be strictly controlled to ensure the stability and reliability of the production process.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
