煤粉还原芒硝法制无水硫化钠工业化实践

Industrial practice of preparation of anhydrous sodium sulfide by reduction of glauber′s salt with coal

工业硫化钠是重要的化工原料和还原剂。中国工业化大规模生产工业硫化钠主要采用煤粉还原芒硝法,所得硫化钠产品纯度仅为60%,产品附加值低。在煤粉还原芒硝法生产低铁硫化钠基础上,将半成品硫化钠浓碱液蒸发、浓缩、结晶制得结晶硫化钠,结晶硫化钠再经干燥制得无水硫化钠,所得硫化钠产品纯度达到92%以上。制备无水硫化钠产品延伸了硫化钠产品的产业链。主要介绍了生产无水硫化钠小型工业化装置系统、工艺控制条件和产品质量。

Industrial sodium sulfide is an important chemical raw material and reducing agent.China mainly uses coal reduction glauber＇s salt method in industrialization and mass production of industrial sodium sulfide.But the purity of sodium sulfide is only 60% ,therefore the product＇s added value is very low.On the basis of using the coal reduction glauber＇ s salt method to produce low iron sodium sulfide, the semi-finished product concentrated alkali solution was evaporated, concen- trated, and crystallized again to produce sodium sulfide crystal and then it was desiccated to prepare the anhydrous sodium sulfide.The purity of sodium sulfide reached 92% under this process.The anhydrous sodium sulfide product extended the industry chain of sodium sulfide production.A small-scale industrial equipment, technical control conditions, and product quality for anhydrous sodium sulfide were mainly introduced.