TY - JOUR
T1 - Environmentally clean materials from hazardous red mud, ground cooled ferrous slag and lime production waste
AU - Mymrin, Vsévolod
AU - Alekseev, Kirill
AU - Fortini, Otavio M.
AU - Aibuldinov, Yelaman K.
AU - Pedroso, Cleber L.
AU - Nagalli, André
AU - Winter, Edgar
AU - Catai, Rodrigo E.
AU - Costa, Eliane B.C.
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/9/10
Y1 - 2017/9/10
N2 - New composite materials were developed from red mud, a residue from bauxite mining, which can be used in several applications such as airfield runways, municipal waste dumps, and production of tiles among others. The composites contain 52 to 78 wt % of red mud with pH value near 13.5, ground cooled ferrous slag (20–45%), and lime production waste (2%). The main objectives of this research were to develop new environmentally efficient solutions for these three solid wastes as valuable components of reusable materials and to study their structure formation processes. Different wet mixes of these three wastes were compacted with a force of 10 MPa to cylindrical shapes of 20 × 20 mm, and hardened at 94–96% humidity. The materials had axial resistance strength 1.8, 3.4, 6.2 and 11.2 MPa on the 3rd, 7th, 14th, and 365th days respectively; coefficients of linear expansion ranged between 0.3 and 4.76%, and water absorption ranged from 1.8 to 9.31%. The hardening process was monitored by XRD, SEM, EDS, and LAMMA demonstrating that new mainly amorphous formations are responsible for the materials’ structure formation. Leaching and solubility tests show that the new materials meet environmental standards for the intended applications.
AB - New composite materials were developed from red mud, a residue from bauxite mining, which can be used in several applications such as airfield runways, municipal waste dumps, and production of tiles among others. The composites contain 52 to 78 wt % of red mud with pH value near 13.5, ground cooled ferrous slag (20–45%), and lime production waste (2%). The main objectives of this research were to develop new environmentally efficient solutions for these three solid wastes as valuable components of reusable materials and to study their structure formation processes. Different wet mixes of these three wastes were compacted with a force of 10 MPa to cylindrical shapes of 20 × 20 mm, and hardened at 94–96% humidity. The materials had axial resistance strength 1.8, 3.4, 6.2 and 11.2 MPa on the 3rd, 7th, 14th, and 365th days respectively; coefficients of linear expansion ranged between 0.3 and 4.76%, and water absorption ranged from 1.8 to 9.31%. The hardening process was monitored by XRD, SEM, EDS, and LAMMA demonstrating that new mainly amorphous formations are responsible for the materials’ structure formation. Leaching and solubility tests show that the new materials meet environmental standards for the intended applications.
KW - Bauxite mineral processing waste
KW - Chemical interaction
KW - Environment management
KW - Hazardous red mud
KW - Mechanical properties
KW - Recycling
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U2 - 10.1016/j.jclepro.2017.05.109
DO - 10.1016/j.jclepro.2017.05.109
M3 - Article
AN - SCOPUS:85025475048
SN - 0959-6526
VL - 161
SP - 376
EP - 381
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
ER -