In the tungsten smelting solution, after adding nitric acid, the pH value of the solution will show a significant downward trend. The following is a specific analysis and summary
Strong acidity of nitric acid
Nitric acid is a strong acid. When added to the solution, it will quickly ionize to produce a large number of hydrogen ions (H+), which will increase the hydrogen ion concentration in the solution, thereby reducing the pH value of the solution.
Changes in pH value
Initial stage
Before adding nitric acid, the pH value of the solution may be in a certain range, depending on the original ion type and concentration in the solution.
After adding nitric acid
With the addition of nitric acid, the pH value of the solution will drop rapidly. This is because the hydrogen ions produced by the ionization of nitric acid combine with the water molecules in the solution to form hydronium ions (H3O+), further reducing the pH value of the solution.
Final pH value
The pH value of the final solution depends on the amount of nitric acid added and the influence of other ions in the solution. Generally, in order to obtain the best tungsten precipitation effect, it may be necessary to adjust the pH value of the solution to a certain acidic range.
pH adjustment under specific conditions
In some specific tungsten smelting processes, it may be necessary to accurately control the pH value of the solution by adding nitric acid. For example, when calcium chloride solution is added to the purified sodium tungstate solution to obtain calcium tungstate (CaWO4) precipitation, the pH value of the solution may need to be adjusted to a range of 2.5 to 3.0 to ensure that molybdenum forms insoluble molybdenum trisulfide precipitation and is removed.
In summary, the pH value of tungsten smelting solution will be significantly reduced after nitric acid is added. In order to obtain the best tungsten precipitation effect, it may be necessary to accurately control the pH value of the solution by adding an appropriate amount of nitric acid. The specific pH adjustment range needs to be determined according to specific process conditions and requirements.
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