Preparation of Iron Rich Cements Using Red Mud

Synthesis and Mechanical Characterization of Iron Oxide Rich Sulfobelite Cements Prepared Using Bauxite Residue

“…Furthermore, the peaks of belite are of low intensity, but, from a slight reduction of intensity and significant portlandite formation, it is possible to state that belite hydrated until 56 days of curing. It is worth to mention that sulfobelite cements were synthesized by using a reasonable amount of BR, as previously reported 18,22,23 . Cement F-18 made using 10.5wt-% of BR, achieved an early high mechanical strength, comparable to what Duvallet et.…”

“…Amounts of BR greater than 20wt-% on the clinker were not tested, as shown feasible by Singh et. al., 15 mainly due to concern of a higher Na 2 O content in the Brazilian BR (8.2wt-%) in comparison to the Indian BR (5.8wt-%) 18 , although Na 2 O on both clinkers reached the similar level around 2wt-%.…”

“…Singh et al, investigated the synthesis of iron rich sulfobelitic cement using: hydrated lime 45-50 wt-%, BR 30-35wt-%, bauxite 15-20wt-% and gypsum 7.5-10wt-%. Burning the raw meal at 1250ºC, the clinker composition achieved was majorly C 4 AF e C 4 A 3 S, which after hydration exhibited mechanical strength comparable to Portland cement 18 . Duvallet et al, investigated the possibility of producing a sulfobelitic cement from: hydrated lime, bauxite, BR, fly ashes and bottom ashes.…”

“…Therefore, alternative cements of lower environmental impact, such as sulfobelite cements, have been developed and this study approached exactly the use of BR to synthesize clinkers of sulfobelite cements. These cements, which have been developed in China in the 1970's, have gained a great deal of attention due to their economic, environmental and technical advantages when compared to Portland cements 15,18,21 :…”

“…Other proportions of the constituents that have less C 4 A 3 S and more C 2 S and C 4 AF do not present so significant environmental and technical advantages, but allow expressive reduction in cost, enhancing their economic viability. Following this trend some studies have investigated the use of BR as one of the raw material for the synthesis of sulfobelitic clinker 5,18,22,23 . Singh et al, investigated the synthesis of iron rich sulfobelitic cement using: hydrated lime 45-50 wt-%, BR 30-35wt-%, bauxite 15-20wt-% and gypsum 7.5-10wt-%.…”