1. Appearance color
Sodium sulfide yellow tablets: usually appear yellow or light yellow, and the color is brighter.
Sodium sulfide red flakes: mostly red or dark brown, relatively dark in color.
2.Chemical composition
Sodium sulfide yellow tablets: After more rigorous purification treatment, the impurity content is relatively low and the purity is higher. The main ingredient is sodium sulfide.
Sodium sulfide red flakes: usually contain a certain amount of moisture and impurities, and are relatively low in purity. In addition to sodium sulfide, they may also contain other substances produced during the preparation process, such as free sulfur.
3. Production process
Sodium sulfide yellow tablets: The requirements for production materials are relatively low, the production process is relatively simple, and it is produced through specific chemical reactions.
Sodium sulfide red tablets: The preparation process is more complicated and requires special treatment of sodium sulfide, such as adding sulfur or other special chemical reaction steps.
4. Physical properties
Solubility: Both yellow and red tablets are soluble in water, but red tablets are more water soluble, have a higher solubility in warm water, and dissolve faster.
Stability: Red tablets are relatively more stable during transportation and storage, and are less likely to deteriorate or deliquescence. Yellow tablets need to be protected from moisture, as they are prone to hygroscopicity in a humid environment.
5. Application areas
Sodium sulfide yellow flakes: Due to its low cost and relatively slow dissolution rate, it is widely used in the leather industry for dehairing and degreasing; in the paper industry for pulp production to remove resin from wood; and in sewage treatment to remove heavy metal ions.
Sodium sulfide red flakes: Due to its high reactivity and solubility, it is more suitable for use in situations that require rapid response, such as certain special chemical reactions and processes in the leather industry that require high dehairing speed and effect.
6. Price and cost
Sodium sulfide yellow flakes: The production process is simple and the requirements for raw materials are relatively low, so the price is relatively low. It is suitable for large-scale production and application, and can meet the needs of some industries that are more sensitive to cost.
Sodium sulfide red tablets: Due to the complex preparation process and high requirements for raw materials and production processes, its price is relatively high.
Post time: Jun-13-2025
