Effect of Fe2+/Fe3+ on high-strength ceramsite prepared by sintering geopolymers using iron ore tailings
Source abstract
Abstract
Abstract Iron ore tailings (IOTs) and coal gasification slag (CGS) were used to prepare novel ceramsites via high-temperature sintering. The IOTs were activated by NaOH to form a geopolymer that was sintered at 650 °C, 850 °C, and 1050 °C to obtain ceramsites. The formation of the geopolymer was confirmed by the characteristic peaks of Si–O–T (T = Si, Al) in the Fourier transform infrared spectra. X-ray diffractograms showed that Fe3+ participated in the geopolymerization reaction, whereas Fe2+ did not; hence the effect of the Fe2+/Fe3+ ratio was investigated. This ratio increased with increasing sintering temperature, thereby facilitating nucleation within the sample. The mullite–pyroxene network that formed upon sintering at 1050 °C improved the strength of the prepared ceramsite and its structure became more compact. Specifically, the cylinder compressive strength increased from 10.5 to 35.5 MPa after sintering at 1050 °C. Overall, this method of preparing high-strength ceramsites from IOTs and CGS can be used for the preparation of high-strength lightweight concrete.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (45)
Show source-provided references
1. Reuse of iron ore tailings from tailings dams as pigment for sustainable paints10.1016/j.jclepro.2018.07.313 ↗
2. Study of the recovery and recycling of tailings from the concentration of iron ore for the production of ceramic10.1016/j.ceramint.2014.07.145 ↗
3. Characterisation of residual carbon from entrained-bed coal water slurry gasifiers10.1016/j.fuel.2006.09.033 ↗
4. The surface characteristics and reactivity of residual carbon in coal gasification slag10.1021/ef9005065 ↗
5. Wang · 2016
6. Investigation of a new lightweight green concrete containing sludge ceramsite and recycled fine aggregates10.1016/j.jclepro.2019.07.012 ↗
7. The experimental study on use of industrial wastes in ceramsite for construction10.4028/www.scientific.net/AMM.71-78.1132 ↗
8. Corrosion of MgAl2O4 spinel with different Al2O3 contents in iron-containing gasifier slag10.4028/www.scientific.net/SSP.281.118 ↗
9. Mechanical properties of sintered ceramsite from iron ore tailings affected by two-region structure10.1016/j.conbuildmat.2019.117919 ↗
10. Preparation, optimization, and application of sustainable ceramsite substrate from coal fly ash/waterworks sludge/oyster shell for phosphorus immobilization in constructed wetlands10.1016/j.jclepro.2017.12.102 ↗
11. Chong · 2015
12. Preparation and characterization of foam ceramics from red mud and fly ash using sodium silicate as foaming agent10.1016/j.ceramint.2012.08.042 ↗
13. Geopolymer, green alkali activated cementitious material: synthesis, applications and challenges10.1016/j.conbuildmat.2019.07.112 ↗
14. Thermal and mechanical properties of geopolymers exposed to high temperature: a literature review
15. Effects of high-temperature heat treatment on the mechanical properties of unidirectional carbon fiber reinforced geopolymer composites10.1016/j.ceramint.2010.02.012 ↗
16. Preparation of macroporous ceramic from metakaolinite-based geopolymer by calcination10.1016/j.ceramint.2015.05.067 ↗
17. Synthesis of ceramic materials from ecofriendly geopolymer precursors10.1016/j.matlet.2018.07.128 ↗
18. Synthesis and thermal behaviour of potassium sialate geopolymers10.1016/S0167-577X(02)01009-1 ↗
19. Thermal behaviour of inorganic geopolymers and composites derived from sodium polysialate10.1016/S0025-5408(02)01022-X ↗
20. Structures and metal leachability of sintered sludge-clay ceramsite affected by raw material basicity10.1061/(ASCE)EE.1943-7870.0000324 ↗
21. Mohd · 2012
22. Mechanical properties of alkali activated flyash/Kaolin based geopolymer concrete10.1016/j.conbuildmat.2015.08.009 ↗
23. Effect of the silicate activator pH on the microstructural characteristics of waste-based geopolymers10.1016/S0301-7516(02)00013-3 ↗
24. Microstructure and engineering properties of Fe2O3(FeO)-Al2O3-SiO2 based geopolymer composites10.1016/j.jclepro.2018.07.171 ↗
25. Farrell · 1972
26. Transformation of trace element-substituted maghemite to hematite10.1346/CCMN.1988.0360105 ↗
27. Effect of alkali cation type on strength endurance of fly ash geopolymers subject to high temperature exposure10.1016/j.matdes.2018.05.023 ↗
28. Dissolution of aluminosilicate minerals and by-products in alkaline media10.1007/s10853-006-0531-8 ↗
29. Geopolymerization ability of natural and secondary raw materials by solubility test in alkaline media10.3390/environments4030056 ↗
30. Immobilisasi Fe3+ DAN Cr6+ PADA geopolimer Berbasis Abu Layang-Abu Sekam Padi
31. Effect of silicate modulus on the setting, mechanical strength and microstructure of iron-rich aluminosilicate (laterite) based-geopolymer cured at room temperature10.1016/j.ceramint.2018.08.205 ↗
32. The role of iron in the formation of inorganic polymers (geopolymers) from volcanic ash: a Fe Mössbauer spectroscopy study10.1007/s10853-013-7319-4 ↗
33. Fe speciation in geopolymers with Si/Al molar ratio of ∼210.1016/j.jeurceramsoc.2006.10.006 ↗
34. Mullite precursor phases10.1016/0955-2219(93)90062-V ↗
35. Constitution of the γ-alumina phase in chemically produced mullite precursors10.1016/0955-2219(94)90022-1 ↗
36. Initial stage of deposit formation process in a coal fired grate-rotary kiln for iron ore pellet production - ScienceDirect10.1016/j.fuproc.2018.03.005 ↗
37. Comment on "influence of Fe3+/Fe2+ ratio on the crystallization of iron‐rich glasses made with industrial wastes10.1111/j.1151-2916.2001.tb01088.x ↗
38. Sinter-crystallization in air and inert atmospheres of a glass from pre-treated municipal solid waste bottom ashes10.1016/j.jnoncrysol.2014.02.009 ↗
39. Understanding the relationship between geopolymer composition, microstructure and mechanical properties10.1016/j.colsurfa.2005.06.060 ↗
40. Mix design factors and strength prediction of metakaolin-based geopolymer10.1016/j.ceramint.2017.06.006 ↗
41. Dehydration and structural development of mullite precursors: an FTIR spectroscopic study10.1016/S0955-2219(01)00265-5 ↗
42. Effects of Si/Al ratio on the structure and properties of metakaolin based geopolymer10.1016/j.ceramint.2016.06.033 ↗
43. Controllable preparation and synthetic mechanism of mullite from the bauxite with Fe-rich oxide content10.1016/j.matchemphys.2017.09.017 ↗
44. Influence of fly ash on the pore structure and shrinkage characteristics of metakaolin-based geopolymer pastes and mortars10.1016/j.conbuildmat.2017.05.067 ↗
45. Gunasekara · 2016