@Article{jrm.2020.011462,
AUTHOR = {Yanrong Zhao, Ping Chen, Shifeng Wang, Yaxiong Ji, Yuanhao Wang, Bolin Wu, Rongjin Liu},
TITLE = {Utilization of Bayer Red Mud Derived from Bauxite for Belite-Ferroaluminate Cement Production},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {8},
YEAR = {2020},
NUMBER = {11},
PAGES = {1531--1541},
URL = {http://www.techscience.com/jrm/v8n11/40268},
ISSN = {2164-6341},
ABSTRACT = {Bayer red mud (BRM) is a kind of industrial solid waste characterized
by huge volume and high alkalinity. Its disposal generates serious environmental
pollution and occupies a large number of farmland. The utilization and recycling
of BRM is currently a crucial issue and needs to be addressed as soon as possible.
The chemical composition of BRM is similar to cement clinker. In this study, the
feasibility of preparing Belite-ferroaluminate clinker (BFAC) with different BRM
was explored. The physical properties, mechanics performance, radioactivity
levels and trace harmful metals leaching were measured. XRD, BEI and EDS
were used to characterize the mineral formation, and SEM is used to reveal the
solidified mechanism of trace harmful metal. The results show that the preparation
of BFAC using a certain amount of BRM was feasible. The formed phases in clinkers mainly included C<sub>4</sub>A<sub>3</sub>Š, C<sub>2</sub>S and C<sub>4</sub>AF. The flexural strength and compressive strength of BFAC at 3 days increased whereas 28 and 90 days decreased with
the increase of BRM due to the formation of higher C<sub>4</sub>AF and lower C<sub>2</sub>S. The
formation of large amounts of Al<sub>2</sub>O<sub>3</sub>·3H<sub>2</sub>O gel and Fe<sub>2</sub>O<sub>3</sub>·3H<sub>2</sub>O gel in hydration
products enhanced the adsorption capability to heavy metals and other ions. The
trace harmful metal concentration in the leaching solution was much less than the
upper limits. The radioactivity level of leaching solution was close to natural
radioactive background. BRM is safe as raw material of BFAC.},
DOI = {10.32604/jrm.2020.011462}
}