High-temperature modification and air-quenching granulation of steel slag  

作　　者：Hui Wang Chao Liu Hong-wei Xing Jin-hu Wu Wen-long Lin Shuo Li Guo-hui Ding Yu-zhu Zhang 

机构地区：[1]College of Metallurgy and Energy,North China University of Science and Technology,Tangshan,063200,Hebei,China [2]Steelmaking Operation Department,Shougang Jingtang United Iron&Steel Co.,Ltd.,Tangshan,063200,Hebei,China

出　　处：《Journal of Iron and Steel Research International》2022年第5期783-792,共10页

基　　金：supported by the Key Research and Development Program of Hebei Province(Grant Number 19273806D);the Project of Hebei Provincial Department of Education(Grant Number JQN2020042).

摘　　要：To solve the problem of difficult utilization of steel slag,the liquid steel slag was modified and the air-quenching granulation process was carried out to make steel slag into a value-added end product:air-quenching granulated steel slag.The granulated slag was tested to analyze the variation rule of slag properties under different modification conditions.Based on the phase diagram of CaO–Si_(2)O–FeO–MgO–Al2O3 slag system,the feasibility of blast furnace(BF)slag as modifier was determined.When the addition of BF slag was increased from 0%to 35%,following results were obtained.The slag fluidity was improved,and the air-quenching temperature range was expanded.Then,the yield of air-quenched steel slag increased,while the granulation rate,the degree of sphericity,the compactness were decreased.Furthermore,the air-quenching granulation process could substantially improve the stability and the amorphous content of steel slag.The maximum removal rate of free CaO was above 80%and the amorphous content was up to 95%.Taking the factors of yield and properties of granulated steel slag into full consideration,the optimum proportion of BF slag is around 15%.

关 键 词：Steel slag MODIFICATION Air-quenching granulation Free CaO AMORPHOUS PROPERTY 

分 类 号：TF142[冶金工程—冶金物理化学]