Preparation and Metallurgical Analysis of High Activity Burnt Lime for Steelmaking

作     者：Hua-qiang HAO Yu-zhu ZHANG Su-ju HAO Chao-fa ZHANG Wu-feng JIANG Peng-hui CUI 

作者机构：College of MetallurgyNortheastern University Department of Long ProductTangshan Iron and Steel CompanyHebei Iron and Steel Group College of Metallurgy & EnergyKey Laboratory of the Ministry of Education for Modern Metallurgy TechnologyNorth China University of Science and Technology 

出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)

年 卷 期：2016年第23卷第9期

页      面：884-890页

核心收录：

学科分类：080602[工学-钢铁冶金] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Sponsored by National Natural Science Foundation of China(51174075,51274084) Natural Science Foundation of Hebei Province of China(E2012209024,E2014209157) 

主　　题：burnt lime high pressure calcination activity degree physical property slag performance 

摘      要：Burnt lime is an important material in steelmaking and its activity degree is a key factor for liquid steel quality. The burnt lime was made by the calcination of limestone in a high pressure electric furnace. The burnt lime mineralogical phases and micro-morphologies were characterized by X-ray diffraction （XRD） and field emission scan- ning electron microscopy （FE-SEM）. The burnt lime activity degree was determined by acid-base titration, the burnt lime pore distribution was measured by mercury intrusion porosimetry （MIP）, and the thermal effect of a mixture of burnt lime and slag was measured by differential scanning calorimetry （DSC）. The results showed that the CaO grain size and pore size of burnt lime made under high pressure were larger than those of burnt lime made under atmos- pheric pressure. The CaO grain size and pore size increased and the laminate phenomenon also occurred clearly under high pressure. The activity degree of burnt lime made under high pressure was greater than that made under atmos- pheric pressure. The maximum activity degree was 437 mL for burnt lime made under a pressure of 0.4 MPa. For the same ratio of CaO to SiOz, the melting temperature, hemisphere temperature and fluidity temperature of slag decreased with increasing burnt lime activity degree. The higher the activity degree the burnt lime had, the better the slag forming occurred. It was advantageous for -2CaO · SiO2 and 3CaO · SiO2 forming at lower temperatures if the burnt lime activity degree was increased.