The production process of ammonium metatungstate neutralization method can be divided into the following main steps, which will be described in detail in the following point-by-point representation and summary, combined with the relevant figures and information in the article:
- Raw material preparation
Main raw materials: ammonium paratungstate (APT) and nitric acid.
Preparation process: Add ammonium paratungstate to deionized water and ammonium citrate to make a slurry containing WO₃ 12% to 30% concentration.
- Nitric acid addition and neutralization reaction
Nitric acid addition
Add 3% to 5% dilute nitric acid to the ammonium paratungstate slurry at a ratio of ammonium paratungstate: nitric acid = 1:20.
Control parameters
Solid-liquid ratio: 1: (3 to 4).
pH value: 2 to 4, which can be monitored and adjusted in real time by a pH meter.
Temperature: Heat to 80 to 90°C, and control the pH value at constant temperature and volume.
Stirring reaction
Stirring reaction for 4 hours at a stirring speed of 80 r/min or adjusted according to process requirements.
- Aging and Filtration
Aging
Aging for several hours makes the reaction more complete.
Filtration
Filter the aged solution to remove insoluble matter.
- Concentration and Crystallization
Concentration
Continue to concentrate the filtered clear solution until the WO₃ content is about 50%.
Crystallization
Cool and crystallize under appropriate conditions to obtain crystals of ammonium metatungstate.
- Drying and Packaging
Drying
Dry the crystals at 80℃ to remove excess water.
Packaging
Crush and sieve the dried ammonium metatungstate and package it according to specifications, such as plastic inner and iron outer barrels, with a net weight of 50 kg or 25 kg per barrel.
- 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.
Through the above production process, high-quality ammonium metatungstate products can be produced efficiently and stably. At the same time, attention should be paid to the implementation of environmental protection and safety measures to ensure the sustainability and safety 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
