磷矿关键组分对湿法烟气脱硫技术的影响  

The effect of primary components of phosphate rock on wet flue gas desulfurization

作　　者：王旭君 梅毅[1,2,3] 杨一帆 夜晨 何德东 徐磊 何宾宾 聂云祥 WANG Xujun;MEI Yi;YANG Yifan;YE Chen;HE Dedong;XU Lei;HE Binbin;NIE Yunxiang(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunna Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming 650500,China;Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province,Kunming 650500,China)

机构地区：[1]昆明理工大学化学工程学院,昆明650500 [2]云南省磷化工节能与新材料重点实验室,昆明650500 [3]云南省高校磷化工重点实验室,昆明650500

出　　处：《环境工程学报》2022年第9期2921-2929,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(22068019);云南省“云岭学者”培养计划项目(10978195)。

摘　　要：磷矿浆湿法烟气脱硫技术将污染物SO_(2)吸收转化为硫酸原位分解磷矿,失活后的磷矿浆用于生产磷酸,节约了湿法磷酸生产中硫酸用量,无废水废液排放,是一种绿色、经济的技术。通过对磷矿浆及其主要组分开展脱硫实验,确立了磷矿中脱硫的关键活性组分及其对脱硫效果的影响。XRD、IC等实验及表征结果表明,SO_(2)吸收后转化形成的硫酸会优先与磷矿中的活性组分碳酸镁钙反应,待其消耗殆尽再与氟磷酸钙反应。与氟磷酸钙相比,碳酸镁钙呈现出优越的脱硫活性。氟磷酸钙分解过程中产生的H^(+)和PO_(4)^(3–)会抑制S(Ⅳ)转化为S(Ⅵ)的速率,导致脱硫率下降。PO_(4)^(3–)抑制SO_(2)脱除与温度、pH均有关,当温度高于55℃、且pH为4.75~2.61时,其抑制作用最明显。本研究可为磷矿浆湿法烟气脱硫技术的优化提供参考。Wet flue gas desulfurization with phosphate rock slurry is a green and economic technology.The pollutant SO_(2) is absorbed and converted into sulfuric acid to decompose phosphate rock in situ,and then the inactivated phosphate rock slurry is directly transported to the flotation section for producing phosphoric acid,which effectively saves the amount of sulfuric acid.In addition,there is no waste water and liquid waste discharged in the whole process.Herein,the key active components for desulfurization in phosphate rock and their influence on desulfurization effect were established,through the desulfurization experiment with phosphate rock and its main components.The XRD,IC and other experiments and characterization results indicated that CaMg(CO_(3))_(2) preferentially reacted with sulfuric acid formed by SO_(2) conversion.When CaMg(CO_(3))_(2) was exhausted,Ca_(5)(PO_(4))_(3)F began to react with sulfuric acid.Significantly,compared with Ca_(5)(PO_(4))_(3)F,the CaMg(CO_(3))_(2) showed superior desulfurization activity.The H^(+) and PO_(4)^(3–),produced from the decomposition of Ca_(5)(PO_(4))_(3)F,would inhibit the conversion of S(Ⅳ)towards S(Ⅵ),which was the key reason for the decrease of desulfurization efficiency.The inhibition effect of PO_(4)^(3–)on SO_(2) removal was related to temperature and pH value.It was most significant when the temperature was higher than 55℃and the pH value was between 4.75 and 2.61.Our research can provide a reference for the optimization of wet flue gas desulfurization technology for phosphate slurry.

关 键 词：磷矿浆 脱硫 吸收 碳酸镁钙 氟磷酸钙 

分 类 号：X51[环境科学与工程—环境工程] TQ028.8[化学工程]