Sodium Sulphide is used for making sulphur dyes and sulphide, as an agent in ore flotation, and other chemical compounds etc.
Technical specification of sodium sulphide (national standard gb/t10500 — 2000)
| Item | normal sodium sulfide(red flake) | low iron sulfide(yellow flake) | high levels of sodium sulfide |
| supreme grade | first grade | qualified grade | first grade | qualified grade |
| na2s≥ | 60. 0 | 60. 0 | 60. 0 | 60. 0 | 60. 0 | 65. 0 |
| na2so3≤ | 2. 0 | --- | --- | --- | --- | --- |
| na2s2o3≤ | 2. 0 | --- | --- | --- | --- | --- |
| fe ≤ | 0. 03 | 0. 12 | 0. 20 | 0. 003 | 0. 005 | 0. 08 |
| na2co3 ≤ | 3. 5 | 5. 0 | --- | 2. 0 | 3. 0 | 4. 0 |
| water insoluble≤ | 0. 20 | 0. 40 | 0. 80 | 0. 05 | 0. 1 | 0. 3 |