The principle of the production of ammonium metatungstate by neutralization is mainly based on acid-base reaction. By adjusting the pH value, ammonium paratungstate (APT) is converted into ammonium metatungstate (AMT). The following are the detailed steps and summary of the production principle:
Raw material preparation
The main raw materials are ammonium paratungstate (APT) and acid solution, such as nitric acid.
Acid-base reaction
Under certain temperature and stirring conditions, acid solution is added to the ammonium paratungstate solution for neutralization reaction.
By controlling the amount of acid added, the pH value of the solution can be adjusted to the range of 3-4, which is the key pH range for conversion to ammonium metatungstate.
Conversion process
Under pH value of 3-4, certain temperature and strong stirring conditions, the ammonium paratungstate solution is gradually converted into ammonium metatungstate solution.
During the conversion process, a series of chemical reactions may be involved, but the key is to control the pH value and temperature to ensure efficient conversion.
Crystallization and separation
As the reaction proceeds, ammonium metatungstate reaches a supersaturated state in the solution and begins to precipitate crystals.
By filtering and separating, the solid product of ammonium metatungstate can be obtained.
Subsequent treatment
The obtained ammonium metatungstate product may also need to be dried, crushed and other subsequent treatments to meet the requirements of the market or downstream applications.
In summary, the principle of the production of ammonium metatungstate by neutralization method is mainly to convert ammonium paratungstate into ammonium metatungstate through acid-base reaction under the conditions of controlling pH value, temperature and stirring, and obtain the final product through steps such as crystallization, filtration and separation.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
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