2023·11工艺与设备157ModernChemicalResearch当代化工研究含硫化钠废水制备无水硫化钠工艺研究*高军1沈伟1亓虎1章煜东2*(1.浙江卫星能源有限公司浙江3140002.浙江工业大学浙江313200)摘要:含硫化钠废水通过蒸发浓缩结晶可以得到硫化钠晶体,由于硫化钠在加热的水溶液中容易水解产生硫化氢,实际得到硫化钠晶体的收率很低。本文向含硫化钠废水中补加液碱,控制废水中氢氧化钠的质量分数6.0%~7.0%,可以有效抑制硫化钠在水溶液加热蒸发过程中的水解,通过蒸发浓缩结晶过滤,得到带结晶水的硫化钠晶体,再加热脱除结晶水可以得到无水硫化钠,通过结晶母液循环套用,无水硫化钠的回收率可以达到97.5%,具有较好的工业化应用前景。关键词:硫化钠;液碱;水解平衡;母液循环套用中图分类号:TQ文献标识码:ADOI:10.20087/j.cnki.1672-8114.2023.11.048StudyonPreparationofAnhydrousSodiumSulfidefromWastewaterContainingSodiumSulfideGaoJun1,ShenWei1,QiHu1,ZhangYudong2*(1.ZhejiangSatelliteEnergyCo.,Ltd.,Zhejiang,3140002.ZhejiangUniversityofTechnology,Zhejiang,313200)Abstract:Sodiumsulfidecrystalscanbeobtainedfromwastewatercontainingsodiumsulfidethroughevaporation,concentrationandcrystallization.Becausesodiumsulfideiseasytohydrolyzeinheatedwatersolutiontoproducehydrogensulfide,theactualyieldofsodiumsulfidecrystalsisverylow.Inthispaper,addingliquidalkalitothewastewatercontainingsodiumsulfideandcontrollingthemassfractionofsodiumhydroxideinthewastewaterby6%~7%caneffectivelyinhibitthehydrolysisofsodiumsulfideintheprocessofheatingandevaporationoftheaqueoussolution.Throughevaporation,concentration,crystallizationandfiltration,sodiumsulfidecrystalswithcrystalwatercanbeobtained.Afterheatingandremovingthecrystalwater,anhydroussodiumsulfidecanbeobtained.Throughtherecyclingofthecrystalmotherliquor,therecoveryrateofanhydroussodiumsulfidecanreach97.5%,ithasagoodprospectofindustrialapplication.Keywords:sodiumsulfide;liquidalkali;hydrolysisbalance;motherliquorcirculation浙江卫星能源有限公司生产过程中产生的硫化氢废气,通常用二级稀氢氧化钠水溶液喷淋吸收后可以达标排放,但同时产生了大量的含硫化钠废水。该股废水含硫化钠质量分数为27%,有机物浓度...