Cradle to Gate
Identity ID
2dd6c7df-590e-4f23-bef7-a15d1be52fa4
Materials
Associated ID
bf8d9f5b-aec9-416a-85e6-35a4e1ffeb49
Included activities starts
Included activities ends
Description
Sodium sulfide mainly serves as a strong reducing agent and sulfurising agent, and is widely used in fields such as ore flotation, dye manufacture, leather unhairing, heavy metal precipitation and high-end electronic chemical materials; Sodium sulfide is modelled as a pure substance; when modelling this substance the user needs to add a solvent of their choice in the model; the dataset contains the main raw and auxiliary materials, energy, atmospheric emissions, water emissions and waste of the production process, and infrastructure such as the manufacture of production equipment and the construction of plant buildings is not included within the dataset boundary; the production process of sodium sulfide includes crushing, batching, roasting, thermal conversion, washing, evaporation and flaking.
Activity Description
The sodium sulfide production process includes crushing, batching, roasting, hot leaching, washing, evaporation, and flaking.
Process Description
Sodium sulfide (CAS No.: 1313-82-2) is a yellow or brick-red crystalline solid with the chemical formula Na2S. Industrial products often appear reddish-brown because they contain sodium polysulfide. It has a strong smell of rotten eggs, is easily deliquescent, and will gradually oxidize and release toxic hydrogen sulfide gas when exposed to air. Sodium sulfide is easily soluble in water and undergoes strong hydrolysis. The aqueous solution is strongly alkaline and can form insoluble sulfide precipitates with most metal ions. Sodium sulfide is mainly used as a strong reducing agent and vulcanizing agent and is widely used in fields such as ore flotation, dye manufacturing, leather hair removal, heavy metal precipitation and high-end electronic chemical materials.
Time period
2016
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The carbon reduction method is the mainstream process for the production of sodium sulfide in China. After the raw material Glauber's salt is dried and dehydrated, it is mixed with the reducing agent (coke) in proportion, and the reduction reaction is carried out in a high-temperature converter (about 1000~1200°C) to generate sodium sulfide and carbon dioxide. Main reaction: Na₂SO₄ + 2C → Na₂S + 2CO₂