A systematic study on solid-state synthesis of monticellite (CaMgSiO4) based ceramic powders obtained from boron derivative waste

Solid-state synthesis of monticellite based ceramic powders from boron derivative waste in an eco-friendly route and the investigation of phase transformation mechanisms were studied. The heat-treatment of boron derivative waste, mainly composed of dolomite, calcite and quartz, was systematically carried out at 650?°C and 800?°C for various dwell times between 1?min and 4?h. The heat-treatment temperatures were selected considering TG-DTA curves of waste and ΔG – T diagrams obtained using FactSage Thermochemical Software. XRF, XRD, FTIR, TG-DTA and SEM analysis, particle size measurement and crystallite size determination carried out extensively. The obtained results showed that monticellite based ceramic powder synthesized at 800?°C for 4?h was composed of monticellite, akermanite, diopside, calcium magnesium borate and zeolite. The calcination of dolomite was completed both at 650?°C for 1?h and up to 800?°C, and calcite was decomposed at 800?°C for 30?min. Both diopside and monticellite were firstly detected at 650?°C for 30?min and at 800?°C for 1?min. Also, akermanite was presented at 800?°C for 1?min. The presented method offers the lowest temperature (800?°C) in literature for synthesis of monticellite and akermanite which reduces the energy consumption during heat-treatment.