What is the hazard of flotation overdose?

In the flotation process, the hazard of overdose is often overlooked. Practical experience has shown that the flotation index has declined, and many cases are caused by excessive flotation. The main hazards of flotation overdose are as follows:

(1) The hazard of excessive collector . 1 destroy the selectivity of the flotation process. A large number of tests and production practices have proved that when the amount of collector exceeds a certain range, the concentrate grade will be significantly reduced. Even if the recovery rate is slightly improved, it will not be worth the loss; 2 Excessive collector will make it difficult to further select the foam concentrate and separate the concentrate. In this case, the site often takes more adjustments to remedy. Due to the addition of the modifier, the medium ore containing the excess agent returns to the process, forming a vicious circle. The flotation process was confusing and the flotation indicator was lowered. In addition, due to the excessive amount of collector, the amount of inhibitor should also be increased. For example, the excess of xanthate and the amount of inhibitor cyanide should be increased, which not only wastes the agent, but also increases the content of toxic agents in the tailings, causing pollution; Excess collectors can reduce the floatability of certain minerals. For example, an excess of fatty acid collector can reduce the floatability of the oxidized ore. This is because the collector forms a multi-layered adsorption reverse layer on the surface of the mineral, and the polar group is instead facing outward, causing the mineral surface to be hydrophilic; 4 excess collector will also form a large amount of foam to make the concentrate And tailings are not easy to dehydrate, which brings difficulties to concentration and filtration.
(2) The hazard of excessive inhibitors. When the inhibitor is excessive, the mineral to be floated may also be inhibited at the same time as the inhibited mineral, resulting in a decrease in recovery. At this time, in order to increase the floating ability of the floating mineral, it is necessary to increase the amount of the collector.
(3) The hazard of excess activator. This not only destroys the selectivity of the flotation process, but may also act as a precipitate with the collector to consume a large amount of collector. For example, when activation of sphalerite, excess copper ions such as copper sulfate, excess copper sulfate will be produced to increase the xanthate and unnecessary consumption of copper precipitated xanthan generated in the pulp.
(4) The hazard of excessive foaming agent. Will cause a lot of sticky and fine bubbles, easy to make gangue minerals adhere to the bubbles and affect the concentrate grade. If the ore contains more mud, it will form a lot of viscous foam, which will easily cause a " running trough " accident, and a large amount of concentrate will overflow the foam tank, causing chaotic production operations.
Strict control of the dosage of the agent is an important factor to improve the flotation process index. Excessive agents destroy the selectivity of the flotation process, increase the cost of beneficiation , and directly or indirectly bring difficulties to the adjustment of the flotation process.
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