In the tungsten smelting process, pH control is essential for extracting and purifying tungsten. Here is some information about the pH range in tungsten smelting.
pH range in tungsten flotation process
The optimal pH range for tungsten flotation is between pH 7 and 9. This range helps to improve the recovery rate and product quality of wolframite concentrate.
In the flotation process, controlling the pH can adjust the surface potential of the material and the surface tension of the liquid phase, so that wolframite can be effectively separated from impurities such as quartz.
pH range in the purification of tungsten compounds
In the purification process of sodium tungstate solution, when sodium silicate needs to be removed, the pH value of the solution should be adjusted to 8-9. At this time, sodium silicate will hydrolyze into silicic acid condensation precipitation, which is convenient for subsequent treatment.
In the further purification process, in order to remove molybdenum, the pH value of the solution needs to be reduced to 2.5-3.0. In this acidic environment, molybdenum will form insoluble molybdenum trisulfide precipitation and be removed.
pH range for preparing pyrochlore tungsten oxide
The acidity of the solution required for preparing pyrochlore tungsten oxide is not strictly limited to a specific range. The previous pH range (3.5~6.0) has been expanded to 3.5~8.9, indicating that pyrochlore tungsten oxide can be prepared under a wider pH condition.
In summary, the pH range in tungsten smelting depends on the specific process steps and goals. Generally speaking, the optimal pH range for black tungsten flotation is 7 to 9; in the purification process of tungsten compounds, the pH value may need to be adjusted to 8~9 or 2.5~3.0; and when preparing pyrochlore tungsten oxide, the pH range is relatively wide and can be adjusted between 3.5~8.9.
Please note that these pH ranges are given based on general conditions and common processes, and may need to be adjusted in actual operations according to specific ore composition, equipment conditions and other factors.
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