Sodium hydrosulfide reaction with water
In the flotation of polymetallic sulfide ores, sodium hydrosulfide selectively inhibits certain sulfide minerals, such as sphalerite, allowing other target sulfide minerals to float preferentially. This is due to chemical reactions on the sphalerite surface that alter its properties.
Sodium hydrosulfide can reduce the oxidation-reduction potential of the pulp, creating an environment conducive to the flotation of certain sulfide minerals. Changes in potential affect the chemical state of mineral surfaces and the effectiveness of collectors.