title: Calcium silicates synthesised from industrial residues with the ability for CO2 sequestration.
abstract: This work explored several synthesis routes to obtain calcium silicates from different calcium-rich and silica-rich industrial residues. Larnite, wollastonite and calcium silicate chloride were successfully synthesised with moderate heat treatments below standard temperatures. These procedures help to not only conserve natural resources, but also to reduce the energy requirements and CO2 emissions. In addition, these silicates have been successfully tested as carbon dioxide sequesters, to enhance the viability of CO2 mineral sequestration technologies using calcium-rich industrial by-products as sequestration agents. Two different carbon sequestration experiments were performed under ambient conditions. Static experiments revealed carbonation efficiencies close to 100% and real-time resolved experiments characterised the dynamic behaviour and ability of these samples to reduce the CO2 concentration within a mixture of gases. The CO2 concentration was reduced up to 70%, with a carbon fixation dynamic ratio of 3.2 mg CO2 per g of sequestration agent and minute. Our results confirm the suitability of the proposed synthesis routes to synthesise different calcium silicates recycling industrial residues, being therefore energetically more efficient and environmentally friendly procedures for the cement industry.
authors.affiliation: Departamento de Física de la Materia Condensada, Universidad de Sevilla, Seville, Spain Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Seville, Spain vmorales@us.es.
authors.forename: Victor
authors.initials: V
authors.lastname: Morales-Flórez
authors.affiliation: Departamento de Ciencias de la Tierra, Universidad de Cádiz, Puerto Real, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Santos
authors.affiliation: Instalaciones INABENSA SA, CIL Torrecuéllar, Seville, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: López
authors.affiliation: Instalaciones INABENSA SA, CIL Torrecuéllar, Seville, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Moriña
authors.affiliation: Departamento de Física de la Materia Condensada, Universidad de Sevilla, Seville, Spain Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Seville, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Esquivias
mesh_terms: D002118:Calcium / Q000737:chemistry; D017610:Calcium Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D057965:Carbon Sequestration; D007220:Industrial Waste / Q000032:analysis*; D059027:Recycling / Q000379:methods*; D017640:Silicates / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D007220:Industrial Waste; D017640:Silicates; D002245:Carbon Dioxide; C031293:calcium silicate; D002118:Calcium
keywords: CCS kinetics; CO2 sequestration; Industrial residues; calcium silicate; recycling; sustainable industry