After adding hydrochloric acid to the tungsten smelting solution, its pH value will show a significant downward trend. The following is a specific analysis and summary:
Properties of hydrochloric acid
Hydrochloric acid is an aqueous solution of hydrogen chloride and is a monobasic aliphatic strong acid. It has strong acidity and can quickly ionize to produce a large number of hydrogen ions (H+).
Changes in pH value after adding hydrochloric acid
When hydrochloric acid is added to the tungsten smelting solution, due to the strong acidity of hydrochloric acid, it will quickly ionize hydrogen ions, resulting in an increase in the concentration of hydrogen ions in the solution. The increase in hydrogen ion concentration directly reduces the pH value of the solution.
The degree of pH change
The degree of pH reduction depends on the concentration and amount of hydrochloric acid added. If the concentration and amount of hydrochloric acid added are high, the pH value of the solution will quickly drop to a lower value.
pH changes in specific process steps
In specific steps of tungsten smelting, such as the purification process of sodium tungstate solution, when impurities such as sodium silicate need to be removed, the pH value of the solution may need to be adjusted to 8-9. At this time, if hydrochloric acid is added, the pH value of the solution will drop rapidly, which is conducive to the precipitation and removal of sodium silicate.
In other steps, such as to remove molybdenum impurities, the pH value of the solution may need to be adjusted to 2.5-3.0. Adding hydrochloric acid can quickly reduce the pH value of the solution to this range, so that molybdenum forms insoluble molybdenum trisulfide precipitation and is removed.
In summary, after hydrochloric acid is added to the solution of tungsten smelting, its pH value will be significantly reduced due to the strong acidity of hydrochloric acid. The degree of reduction depends on the concentration and amount of hydrochloric acid added. In specific process steps, by adjusting the amount of hydrochloric acid added, the pH value of the solution can be controlled within the desired range to achieve effective extraction and purification of tungsten.
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