Sodium sulphide 60% 80ppm

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Sodium sulphide has a diverse range of uses in flotation of various minerals. Below are some of its  applications:

  1. Sulphidizing reagent  for metallic copper, oxides of copper and other minerals of lead and zinc. These are then floatable once they are in sulphidized form.
  2. Used as a dispersant in the flotation of ores containing ultra fine slimes.
  3. Used for desorption of collectors in copper-molybdenum and copper-lead separation
  4. Sodium sulphide is also used for selective flotation of copper-lead-zinc and copper-zinc ores.
  5. It can be used as for desorption of collector in non-metallic flotation


Flotation reagents for most metal sulphides is a well understood topic with a number of flotation reagents already developed for dealing with them. In the case were the ore exists in another form, use of sulphidizing agents like sodium sulphide brings the metal  value surface into the sulphide form which is well known turf and can be easily floated.


Na2S Usage Guidelines


Sodium sulphide Na2S

Suitable Ores

Slow floating chalcopyrite, partially oxidized or tarnished copper ores


Na2S used with lime or in combination with Na2SO3





Coarse particle size recovery


  • At low dose rates (below 500 g/t), can be used as to depress Zn sulphide (eg. sphalerite) and Fe sulphide (eg. pyrite, pyrrhotite) minerals.
  • At high dose rates (above 500g/t), it can be used to depress all sulphides (reverse flotation), allowing gangue to float and be removed. 


CAS number

1313-84-4 (pentahydrate)
1313-84-4 (nonahydrate)





EC number




RTECS number


UN number

1385 (anhydrous)
1849 (hydrate)


Molecular formula


Molar mass

78.0452 g/mol (anhydrous)
240.18 g/mol (nonahydrate)


colorless, hygroscopic solid


rotten eggs


1.856 g/cm3 (anhydrous)
1.58 g/cm3 (pentahydrate)
1.43 g/cm3 (nonohydrate)

Melting point

1,176 °C (2,149 °F; 1,449 K) (anhydrous)
100 °C (pentahydrate)
50 °C (nonahydrate)

Solubility in water

12.4 g/100 mL (0 °C)
18.6 g/100 mL (20 °C)
39 g/100 mL (50 °C)


insoluble in ether
slightly soluble in alcohol

View FileSodium Sulphide 60% 80ppm    Size: (1.26 MB)
View FileSodium Sulphide SDS    Size: (1.23 MB)

  • With thousands of suppliers competing for our business, Kemcore has proven to be the most reliable and consistent import/export company in China, offering quality chemicals at competitive prices. We strive to continue working with them.

    Macheng Macheng

    Senior Buyer

    KS Energy (Pty) Ltd

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    Mike Peto

    Managing Director

    Sesani EPCM

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    Metallurgical Superintendent

    Pan African Mining

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