The production steps of the neutralization method of ammonium metatungstate mainly include the following stages:
- Raw material preparation
Main raw materials: ammonium paratungstate (APT) and nitric acid.
Steps: Mix ammonium paratungstate with deionized water in a certain proportion to prepare an ammonium paratungstate solution of a certain concentration.
- Nitric acid addition and neutralization reaction
Nitric acid addition: Slowly add nitric acid to the ammonium paratungstate solution under stirring conditions.
pH value control: By accurately controlling the amount of nitric acid added, the pH value of the reaction solution is gradually reduced to a predetermined range (such as pH 3-4). pH value control is the key to this step, which directly affects the purity and yield of the product.
Temperature and stirring: During the reaction, it is necessary to control the appropriate temperature (such as 90-95℃) and stirring speed to ensure that the reaction proceeds evenly.
- Crystallization and separation
Crystallization: As the reaction proceeds, ammonium metatungstate begins to crystallize. In this step, the crystallization effect can be optimized by controlling conditions such as temperature and stirring speed.
Separation: Filter or centrifuge the crystallized solution to obtain ammonium metatungstate crystals and mother liquor.
- Washing and drying
Washing: Wash the ammonium metatungstate crystals with deionized water or appropriate solvents to remove residual mother liquor and impurities.
Drying: Dry the washed ammonium metatungstate crystals to remove excess water. The drying temperature and time should be adjusted according to product requirements.
- Packaging and storage
Packaging: Pack the dried ammonium metatungstate crystals, usually using packaging methods such as inner plastic and outer iron barrels, and the net weight of each barrel is determined according to product specifications.
Storage: Store the packaged ammonium metatungstate products in a dry, cool, and ventilated place to avoid direct sunlight and high temperature.
- Environmental protection and safety
Wastewater treatment: Treat the wastewater generated during the production process to ensure compliance with environmental protection requirements.
Waste gas treatment: Collect and treat the generated waste gas to reduce the emission of harmful gases such as nitrogen oxides.
Safety measures: Ensure the safe operation of the equipment and prevent the leakage of dangerous goods such as nitric acid and the occurrence of safety accidents.
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
