Reverse flotation of iron concentrate to remove fluorine and alkali metal oxides

The fluorine in the iron concentrate is generally in the form of fluorite or rare earth fluoride. Usually in an alkaline medium, the iron mineral is inhibited by a large amount of water glass or an appropriate amount of starch, and the anion collector is used as an anti-mineral, such as Baotou Steel in China. The iron concentrate in the plant uses the anion collector reverse flotation process to remove fluorine, and the water glass as the dispersion and inhibitor. The fluorine content in the iron concentrate can be reduced from 1% to 2.4% to about 0.65%, but there is still iron. The problem of large loss and low fluorine removal rate. In addition, a process of adding starch as an inhibitor to a strong alkaline medium, adding Ca ++ as an activator, and an atomic collector to float fluorine and silicon at the same time can also be used.

Alkali metal oxides in the iron ore mainly exists in the form of an alkali metal silicate minerals (such as feldspar minerals, etc.). According to the physicochemical properties of the silicate minerals, the cationic flotation reverse flotation process is generally used. At the same time, it is proved that the addition of hydrofluoric acid is beneficial to increase the removal rate of alkali metal oxides, but it is necessary to extend the flotation time. To ensure the floating of silicon-containing minerals in iron concentrates.

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