湿法磷酸装置连续脱硫技术改造牛司江，姜威，龚丽，杨文娟，朱桂华，何宾宾，坝吉贵，曹剑（国家磷资源开发利用工程技术研究中心/云南磷化集团有限公司，云南晋宁650600）［摘要］为了降低饲料级磷酸氢钙生产中原料湿法磷酸的SO42-含量，将间歇加入磷矿浆脱硫改为连续性加入磷矿浆脱硫，并进行了产业化应用。改造后，按将w（SO42-）降低0.2个百分点的理论量加入磷矿浆时，澄清稀磷酸中w（SO42-）降低0.17个百分点，饲料级磷酸中w（SO42-）降低0.29个百分点，饲料级磷酸氢钙产品中w（游离酸）降低1.26个百分点，总磷相同情况下w（水溶磷）升高0.20个百分点；稀酸澄清槽、浓酸槽没有发生酸不沉降现象；磷酸浓缩、脱氟装置清理周期未发生变化，饲料级磷酸氢钙生产装置清理周期由20d延长到24d。［关键词］湿法磷酸；连续脱硫；磷矿浆；产业化试验；饲料级磷酸氢钙［中图分类号］TQ126.3+5［文献标志码］B［文章编号］1007-6220（2023）01-0029-02TechnologicaltransformationofcontinuousdesulfurizationofWPAplantNIUSijiang,JIANGWei,GONGLi,YANGWenjuan,ZHUGuihua,HEBinbin,BAJigui,CAOJian（NationalEngineeringandTechnologyResearchCenterforDevelopmentandUtilizationofPhosphorusResources/YunnanPhosphateGroupCo.,Ltd.,Jinning650600,China）Abstract：InordertoreducethecontentofSO42-inWPAintheproductionoffeedgradecalciumhydrogenphosphate,theintermittentadditionofphosphaterockslurryisreplacedbycontinuousadditionofphosphaterockslurryfordesulfurization,anditiscarriedoutinindustrialapplication.Aftermodification,whenphosphaterockslurryisaddedaccordingtothetheoreticaldemandfordecreasingw（SO42-）by0.2percentagepoints,w（SO42-）inclarifieddilutephosphoricaciddecreasesby0.17percentagepoints,w（SO42-）infeedgradephosphoricaciddecreasesby0.29percentagepoints,thecontentoffreeacidinfeedgradecalciumhydrogenphosphateproductsdecreasesby1.26percentagepoints,andsolublephosphoruscontentincreasesby0.20percentagepointswhentotalphosphorusisthesame；Acidnon-settlingdoesn'toccurinthediluteacidclarificationtankandtheconcentratedacidtank；Thecleaningcycleofphosphoricacidconcentrationanddefluorinationplantdonotchange,whilethecleaningcycleoffeedgradecalciumhydrogenphosphateplantis...
