硫磺分解磷石膏制硫酸技术进展及推广应用  

Technical progress and application of sulphuric acid production by decomposing phosphogypsum with sulphur

作　　者：王辛龙[1] 张志业[1] 杨守明 杨秀山[1] 钟本和[1] 胡伟 钟显刚 WANG Xinlong;ZHANG Zhiye;YANG Shouming;YANG Xiushan;ZHONG Benhe;HU Wei;ZHONG Xiangang(College of Chemical Engineering,Sichuan University,Chengdu,Sichuan,610065,China;Sichuan Hongda Co.,Ltd.,Shifang,Sichuan,618401,China)

机构地区：[1]四川大学化工学院,四川成都610065 [2]四川宏达股份有限公司,四川什邡618401

出　　处：《硫酸工业》2018年第1期45-49,53,共6页Sulphuric Acid Industry

基　　金：国家863重大项目(2011AA06A106)

摘　　要：针对磷石膏资源化利用课题,开展了硫磺低温分解磷石膏制高浓度SO_2技术、氧化钙残渣的高值化利用技术及磷石膏制酸过程的系统集成及工程实施关键技术研究。硫磺分解磷石膏过程的动力学试验研究结果表明:一段反应温度为650℃,反应停留时间为1 h,反应产物可达到二段物料配比;二段反应温度为1 100℃,磷石膏分解率大于98%,系统脱硫率大于96%。氧化钙残渣配以铝矾土、磷石膏在1 250℃/60 min下可烧制成高品质的硫铝酸盐水泥熟料;采用氯化铵浸取脱硫钙渣碳酸化制备高纯度碳酸钙,残渣中钙浸取率为85.62%,硅脱除率达到95.30%,所得轻质碳酸钙产品纯度达98.90%,达到涂料用优等品指标要求。建立万吨级硫磺低温分解磷石膏制硫酸示范装置,实现了磷石膏转化率99%、分解温度为1 050℃、窑气φ(SO_2)高达12.2%的工艺指标。In view of utilization of phosphogypsum resources,preparation of high concentration SO2technology with low temperature decomposition of phosphogypsum,high value utilization technology of calcium oxide residue and system integration of phosphogypsum acid making process and the key technology of engineering implementation were carried out.The kinetic study on the process of decomposing phosphogypsum with sulphur shows that reaction temperature is650℃and residence time is1h,and reaction product can reach two stage material ratio.The two stage reaction temperature is1100℃,decomposition rate of phosphogypsum is greater than98%,and system desulphurization rate is greater than96%.High quality sulphoaluminate cement clinker can be calcined with calcium oxide residue and bauxite and phosphogypsum at1250℃/60min.High purity calcium carbonate was prepared by ammonium chloride leaching of desulphurized calcium slag.The leaching rate of calcium in the residue was85.62%,and removal rate of silicon was95.30%.The purity of the light calcium carbonate product reached98.90%,and quality evaluation showed that product meet requirements of standard of calcium carbonate powder for paint.Sulphuric acid demonstration plant with low temperature decomposition of phosphogypsum was established.The conversion rate of phosphogypsum was99%,decomposition temperature was1050℃,and kiln gasφ(SO2)was up to12.2%.

关 键 词：硫酸生产 磷石膏 硫磺 技术进展 推广应用 

分 类 号：TQ111.16[化学工程—无机化工] TQ172.6