How many dosing methods are commonly used? why?

One-time dosing means adding a certain agent to the slurry before flotation. This can increase the initial speed of the flotation process. Although the speed is reduced in the later stage, the total flotation time is still short, which is beneficial to improve the flotation index. Generally, for drugs that are easily soluble in water, which are not taken away by the foam machine, and which are not easily reacted in the slurry and are ineffective (such as xanthate, soda, and lime), dosing should be used once.

Segmented dosing refers to the addition of a certain agent in several batches during the flotation process. Generally, 60-70% of the total amount is added before the flotation, and the remaining 30-40% are added to the appropriate places in several batches. Such a staged dosing can improve the quality of the concentrate, but the overall flotation time increases due to the reduced speed at the beginning of the flotation. Generally, it is insoluble in water, easy to be taken away by foam machinery, easy to react in pulp, and some agents with poor selectivity or easy to decompose and fail (such as oil collector , pine oil, Sodium sulphide) should be applied in stages.

In addition, the dosing method is also based on the nature of the ore. For example, when the soluble salts in the pulp are high and a large amount of the drug is adsorbed, it is advantageous to use a staged dosing. As another example, in some preferential flotation situations, it is often beneficial to add the collector in stages in order to mitigate the negative effects of the inhibitor on the desired floating mineral.