The purpose of pH adjustment agent tests is to find the most suitable pH adjustment agent and its dosage to ensure good selectivity and floatability of the minerals to be floated.
Based on practical production experience, the type of adjustment agent and pH value for most ores can be determined. Because pH value is related to the ore composition and the properties of the flotation water, pH tests are still necessary. During the test, based on the optimal grinding fineness, other flotation conditions are kept constant, and only the type and dosage of the pH adjustment agent are tested. The test results are plotted as a curve, with grade and recovery rate on the ordinate and pH adjustment agent dosage on the abscissa. A comprehensive analysis of the curve is then performed to determine the optimal dosage of the pH adjustment agent.
If you are confident in determining the type and pH value of the pH adjuster based on production experience, you can determine the dosage as follows: Add the pH adjuster to the flotation pulp in batches, stir for a certain period of time, and then measure the pH value of the pulp. If the pH value of the pulp does not reach the required value, add another batch of pH adjuster until the required pH value is reached. The final total dosage is the required dosage.
Due to the interaction between reagents, sometimes changes in the dosage of other reagents can also change the pH value of the pulp. In this case, a verification test can be conducted after various condition tests are completed, or a multi-factor combination test can be performed on the pH adjuster with reagents that may affect it.