The purpose of rational addition of the agent is to ensure the maximum efficacy of the agent in the slurry and to maintain the optimal concentration. Therefore, according to the characteristics of the ore, the nature of the agent and the process requirements, the dosing location and the dosing method can be reasonably selected.
1. Dosing location
The choice of dosing location is related to the use and solubility of the agent. Usually the mediator is added to the mill to eliminate the deleterious effects of "inevitable" ions on activation or inhibition. should be added before the collector, also commonly added to the grinding machine, the activator is added to reconcile the often stirred tank, a certain time slot to reconcile with the pulp. Collectors and foaming agents are added to the mixing tank and tank or flotation machine, while insoluble collectors (such as cresol black, white medicine, coal , oil, etc.), in order to promote their dissolution and dispersion, lengthen The time of action of minerals is also often added to the mill.
The usual dosing order is:
(1) When flotation of raw ore, adjuster-inhibitor-collector-foaming agent;
(2) Activator-collector-foaming agent when flotation inhibited minerals.
In addition, the choice of dosing location should also consider the nature of the ore and other specific conditions. For example, some copper sulfide - iron ore flotation plant was added to xanthate grinding machine, resulting in improved sorting index of copper, in addition, the grinding cycle flotation machine mounted Single coarse ore particles recovered have dissociated In order to increase the time of action of the collector, it is also necessary to add the agent to the mill.
2, dosing method
Flotation agents can be used in two ways: one addition and one batch.
One-time addition means that a certain agent is added to the slurry once before flotation, so that the concentration of the agent at a certain working point is high, the strength factor is large, and the addition is convenient, generally for the water-soluble, not to be foamed mechanical zone. Take away, and in the pulp, the agent that is not easy to react and fails (such as soda, lime, etc.) is often used once.
Batch dosing means adding a certain batch of drugs in several batches during the flotation process, generally adding 60% to 70% of the total amount before flotation, and the remaining 30% to 40% are added to appropriate places in several batches. Batch dosing can maintain the concentration of the agent along the flotation line and help improve the quality of the concentrate.
Batch addition should be used for the following situations:
(1) Agents that are difficult to dissolve in water and are easily taken away by foam (such as oleic acid, lipid amine collectors).
(2) An agent that is susceptible to reaction or easy to break down in the slurry. If carbon dioxide, sulfur dioxide, etc., if only added at one point, it will quickly fail.
(3) A dose that requires strict control of the drug. Such as sodium sulfide, the local concentration is too large, it will lose the choice.
The action time of the drug is not the same. The commonly used drugs in practice can be determined by experience, such as pine oil for 1 to 2 minutes and xanthate for 1 to 3 minutes.
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