The fouling properties of SiO2-CaO-P2O5 system in high-temperature rotary kiln phosphoric acid process

作     者：Pan Wu Li Lü Siyang Tang Changjun Liu Hairong Yue Wei Jiang Bin Liang Pan Wu;Li Lü;Siyang Tang;Changjun Liu;Hairong Yue;Wei Jiang;Bin Liang

作者机构：Low-carbon Technology and Chemical Reaction Engineering LaboratorySchool of Chemical EngineeringSichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu 610207China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2020年第28卷第7期

页      面：1824-1831页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：support from the National Key R&D Program of China(2018YFC1900201) the Provincial Key R&D Program of Shanxi(201603D31212003) 

主　　题：Thermal phosphoric acid Kiln technology Fouling formation Phase diagram analysis 

摘      要：Kiln phosphoric acid(KPA)technology could produce P2O5 with high purity and has been applied in thermal phosphoric acid industry;however the formation of fouling in the high-temperature rotary kiln restricts the stable and long-term *** this paper,the reaction of phosphate ores with gaseous P2O5 was investigated in a high-temperature reactor,and the Ca O-SiO2-P2O5 ternary phase diagram was analyzed to understand the fouling formation *** results showed that the low-melting-point products,such as Ca(PO3)2and Ca2P2O7,are responsible for the fouling in the KPA *** addition,a small amount of impurities,e.g.,aluminum and iron,could facilitate the generation of the low-melting-point products and cause serious *** on the high-temperature SiO2-P2O5 and CaO-SiO2-P2O5 phase diagram analysis,the control of Si/Ca molar ratio(e.g.,Si/Ca=2.0)was found to avoid fouling formation in the *** results could provide the operation parameters of reaction temperature and feeds composition to suppress the fouling in the kiln reactor for the phosphoric acid production in industry.