CAS No.:1313-82-2
Molecular formula:Na2S
Molecular weight:78.04
Application:
The role of sodium sulfide in gold flotation minerals mainly includes inhibitor, sulfiding agent, de-agent and adjustment of pulp ion composition.
Inhibitor role: When sodium sulfide is used in large amounts, it can be used as an inhibitor for most sulfide ores and inhibit the vast majority of sulfide ores. It competitively adsorbs on the surface of the mineral, squeezes out the xanthate anions adsorbed on the surface of the mineral, and at the same time, the hydrophilic HS- ions themselves are adsorbed on the surface of the sulfide ore, increasing the hydrophilicity of the mineral, thereby inhibiting the flotation of the mineral.
Sulfiding agent role: For non-ferrous metal oxide ores, sodium sulfide can be used as a sulfiding agent. Non-ferrous metal oxide ores cannot be directly captured by xanthate, but by adding sodium sulfide before flotation, a thin film of sulfide ore can be produced on the surface of the mineral, allowing the xanthate to capture it. This process involves the reaction of sodium sulfide with non-ferrous metal oxide ores to form a sulfide film, thereby activating the mineral so that it can be floated by xanthate collectors.
De-agent function: Sodium sulfide can also be used as a de-agent for mixed concentrates of sulfide ores. When the amount of sodium sulfide is large, it can desorb the xanthate collector adsorbed on the surface of the mineral. Therefore, before the separation of the mixed concentrate, a large amount of sodium sulfide can be added for de-agent, and then washed and re-added with fresh water for pulping and separation and flotation.
Adjusting the ion composition of the pulp: Sodium sulfide can generate insoluble sulfide precipitation with many metal ions, so it also has the function of eliminating some ions in the pulp that are harmful to flotation, and affects the flotation process by adjusting the ion composition of the pulp.
In summary, the role of sodium sulfide in gold mining and flotation is multifaceted, including as an inhibitor, sulfiding agent, de-agent, and an important chemical agent for adjusting the ion composition of the pulp.
Specification:
Specifications | 10PPM | 30PPM |
Sodium sulfide (Na2S), %≥ | 60.0 | 60.0 |
Sodium sulfite (Na2SO3), % ≤ | 3.0 | 3.0 |
Sodium thiosulfate (Na2S203), %≤ | 3.5 | 3.5 |
Iron (Fe), ppm. ≤ | 10 | 30 |
Water insoluble matter, %≤ | 0.2 | 0.2 |
Sodium carbonate (Na2CO3) content ≤ | 3.5 | 3.5 |
Physical and chemical properties:
Industrial products are often pink, brownish red, khaki blocks with bad smell due to impurities. Soluble in cold water, very soluble in hot water, slightly soluble in alcohol. Industrial products are generally a mixture of different forms of crystal water, and contain different degrees of impurities. In addition to different appearance colors, density, melting point, boiling point, etc. are also different due to the influence of impurities.