The amount of nitric acid that needs to be added during the precipitation of tungsten nitrate is not a fixed value because it depends on many factors, such as the concentration of raw materials, reaction conditions, and the purity of the target product. However, based on the information mentioned in reference article 1, we can draw some general guidelines:
Effect of nitric acid dosage
When the amount of nitric acid is too small, more tungsten remains, which may have a greater impact on the recovery rate of specific impurity elements, especially elements such as Al, Ca, Co, and Cr. Increasing the amount of nitric acid can reduce the residual amount of tungsten, but after continuing to increase to a certain amount, the change in recovery rate is no longer significant.
Dosage of nitric acid under experimental conditions
When the dosage of nitric acid is 10 ml, the residual amount of tungsten is reduced to a low level, and the recovery rate of each analyzed element is above 90%.
Other factors to consider
In addition to the amount of nitric acid used, the boiling time will also affect the recovery rate of impurity elements and the residual amount of tungsten. As the boiling time increases, the residual amount of tungsten decreases significantly, and the recovery rate of the analyzed elements also increases.
Conditions such as the nature and concentration of raw materials, reaction temperature and time may also affect the amount of nitric acid used.
In summary, the amount of nitric acid that needs to be added during the precipitation of tungsten nitrate needs to be determined according to the specific situation. Under similar experimental conditions, the dosage of 10 ml of nitric acid may be a reasonable starting point, but the specific dosage needs to be further optimized and adjusted based on the nature of the raw materials, the purity of the target product, and the experimental conditions. In addition, attention should be paid to the safe handling of nitric acid to avoid danger during the experiment.
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