Effect of slag on strength of direct reduced iron produced with dust briquettes Shiqin Li, Xiaojun Ning, Jianliang Zhang, Zhengjian Liu, Xiang Yuan, Fei Wang and Ziluo Chen Metall. Res. Technol., 114 4 (2017) 411 Published online: 03 July 2017 DOI: 10.1051/metal/2017044