During the tungsten nitrate precipitation process, the following reagents may need to be added:
Nitric acid (HNO₃)
Nitric acid is a key reagent in the extraction of tungsten ore and the precipitation of tungsten nitrate. It is used to dissolve tungsten ore and react with tungsten in the ore to form tungsten nitrate.
The specific amount of nitric acid depends on the nature and concentration of the ore and the purity of the target product. In reference article 1, although the specific amount is not explicitly mentioned, the addition of nitric acid is an important step in the precipitation process.
Precipitant
Precipitant is used to precipitate tungsten nitrate from the solution. Although the reference article does not directly mention a specific precipitant, in general chemical analysis, the selection of precipitant is usually based on the principle that it forms an insoluble substance with the target substance.
For example, ammonium salts (such as ammonium chloride or ammonium nitrate) can be used to reduce the pH of the solution and promote the precipitation of tungsten nitrate.
Acidity regulator (such as hydrochloric acid HCl, sulfuric acid H₂SO₄, etc.)
During the precipitation process, the acidity of the solution may need to be adjusted to optimize the precipitation effect. For example, adding hydrochloric acid or sulfuric acid can lower the pH of the solution, thereby facilitating the precipitation of tungsten nitrate.
Washing liquid
After precipitation is completed, the precipitate is usually washed with a washing liquid to remove residual impurities and ions. The selection of the washing liquid should be based on the principle that it can dissolve impurities without dissolving the target product (tungsten nitrate).
Other auxiliary reagents
Depending on the specific precipitation process and ore properties, other auxiliary reagents such as reducing agents, oxidizing agents, stabilizers, etc. may also need to be added to optimize the precipitation effect and improve product quality.
In the process of tungsten nitrate precipitation, nitric acid is mainly added as a reaction reagent, a precipitant is used to precipitate tungsten nitrate, an acidity regulator is used to adjust the acidity of the solution, a washing liquid is used to wash the precipitate, and other auxiliary reagents may be required. The selection and dosage of these reagents should be determined according to the specific ore properties, process requirements and the purity of the target product.
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