Recycling of ash from biomass incinerator in clay matrix to produce ceramic bricks

Reuse of Woody Biomass Ash Waste in Cementitious Materials

“…However, leaching tests should be performed in order to further demonstrate ecotoxic behavior in specific cases and if wood ashes stabilizes in cementitious materials. Besides their reuse in concrete, other possible recycling strategies for the construction and building sector include 12 : geotechnical works such as soil stabilization and road base construction 17,18 , structure fill/embankments, grouting works (flowable fill), production of alternative binders, e.g., geopolymers 19 , production of synthetic aggregates by cold bonding or sintering, as well as brick 21 and cement manufacturing 22 where it can partially replace raw feedstock. Being rich in Ca, Si, Al and Fe oxides, biomass ash can be used as an alternative raw material, and may be used as a substitute for traditional raw materials needed for clinker production 22 , such as limestone (90 % of the conventional raw material), shale and clay, which are otherwise mined or purchased 23 .…”

“…The relatively high CaO content in biomass ash, as reported in this paper, can replace significantly more limestone in the feed for clinker manufacturing. This will result in lower CO 2 emissions, as well as lower energy expenditures due to lower amount of CaCO 3 that has to decompose during burning of raw materials for cement manufacturing (60 % of the CO 2 originates from the endotherminc decomposition of limestone, the remaining from fuel) 22 . The relatively small quantities of biomass ash available, when related to the needs of the cement industry, make that only a minor portion of the raw meal in a kiln that can be replaced.…”

Manufacture of Ceramic Bodies by Using a Mud Waste from the TiO₂ Pigment Industry

“…These ceramic bodies were produced from mixtures of a commercial red stoneware mixture (RSM) with different concentrations of mud (3,5,7,10, 30 and 50 wt.%). The samples were sintered to simulate a fastfiring process.…”

“…Around 30,000 tons per year of mud are generated without any use andit is disposed of in a waste repository [5]. Moreover, the natural radionuclides content is 100 times higher in relation to a typical soil, being classified as a NORM (Naturally Occurring Radioactive Material) industry presenting enhanced levels of radionuclides from the U and Th series [6].Apossible environmental solution to the disposal of a wide range of solid wastes could be their incorporation into ceramics [7]. The prospective benefits include immobilising of some heavy metals and radionuclides in the final matrix, oxidising organic matter and destroying any pathogens during the firing process, based on the results of several full-or bench-scale studies [8].…”

Valorization of sugarcane bagasse ash: Producing glass-ceramic materials

“…Published works have shown the potential of transforming silicate-based residues into ceramic and glass-ceramic products of great utility (Cheng et al, 2011, Höland and Beall, 2002, Karamanov et al, 2009, López et al, 2012, Pérez-Villarejo et al, 2012, Rawlings et al, 2006, Schabbach et al, 2012, Souza et al, 2011and Vu et al, 2012.…”