The Role of Sodium Hydrosulfide in Flotation
Sodium hydrosulfide can sulfidize the surface of partially oxidized sulfide ores, restoring their floatability. This enables sulfide ores that were previously difficult to float due to oxidation to meet flotation conditions again, as it reacts with the surface of oxidized ores to form a sulfide film, enhancing the hydrophobicity of the mineral surface.
Sodium hydrosulfide can act as a modifier during the separation of sulfide ores and oxide ores, suppressing the flotation of oxide ores to achieve effective separation. The mechanism involves forming a hydrophilic film on the surface of oxide ores, which hinders the adsorption of collectors.
In the flotation of polymetallic sulfide ores, sodium hydrosulfide can selectively suppress certain sulfide ores, such as sphalerite, allowing other target sulfide ores to float preferentially. This occurs because it undergoes chemical reactions on the surface of sphalerite, altering its surface properties.
Sodium hydrosulfide can lower the redox potential of the pulp, creating an environment favorable for the flotation of certain sulfide ores. Changes in potential affect the chemical state of the mineral surface and the effectiveness of collectors.
It can remove harmful ions and impurities from the mineral surface, cleaning the surface and improving the efficiency of collector-mineral interactions. The removal of harmful ions and impurities leaves the mineral surface cleaner, facilitating collector adsorption.
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