1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 3. Tianjin Baodi No.1 Middle School, Tianjin 301801, China
Abstract：In order to study the behavior evolution law of chlorine in the blast furnace (BF), Guofeng No.1 1780m3 BF was selected as a case to systemically analyze the thermodynamic behavior of chlorine under actual smelting conditions by means of calculation method using FactSage 6.4 software. The results indicated that the chlorides in furnace burden reacted with P2O5, SiO2, H2O, CO2 and H2 in BF, and the corresponding different reactions occurred in different areas of BF in the burden descending process. The chlorine in furnace burden was predominantly released in the form of HCl. The released HCl rose along with the gas flow and adhered to the furnace burden and inner walls, where a series of complex physiochemical reactions took place, generating chlorides such as NaCl, KCl, MgCl2 and CaCl2. Along with the decline of furnace burden, these chlorides were released again in the form of HCl, thus forming the circulating enrichment of chlorides in the BF. The unreacted HCl escaped with top gas, which would affect the subsequent dust removal equipments, power generation equipments and gas pipes. Herewith through the thermodynamic analysis of chlorine in BF, its evolution law could be better mastered to provide a sufficient basis for reducing the harm of chlorine to the dry dedusting technology BF.
2015, Vol. 25 
