English
Русский Comparison of the effectiveness of rice husk ash for solid phase synthesis of wollastonite and diopside
Abstract
Objectives: This study aims to evaluate the prospects of using rice husk ash for the production of calcium-magnesium silicates and to identify differences in the solid-phase synthesis processes of wollastonite and diopside based on rice husk ash.
Methods. X-ray quantitative phase analysis was used to analyse the obtained samples of synthetic wollastonite and diopside. The porosity of calcium-magnesium silicates was evaluated by a static volumetric method using low-temperature nitrogen adsorption. The elemental composition of the samples was determined using an Oxford INCA X-max 80 energy dispersive detector, and electron microscopic analysis was performed using a Jeol JSM7001F scanning microscope.
Results. Experimental data comparing the properties of synthesized diopside and wollastonite showed that wollastonite is characterized by high porosity and average particle size compared to diopside due to the lower temperature of solid-phase synthesis. The structure of synthetic wollastonite is distinguished by the presence of large irregularly shaped inclusions with a small amount of needle-like particles, while synthesized diopside does not contain needle-like particles, and the inclusions are characterized by smaller size and uniform distribution throughout the volume.
Conclusions. When obtaining calcium-magnesium silicates by solid-phase synthesis based on rice husk ash, the yield of the final product synthetic diopside is significantly higher than that of synthetic wollastonite. The process of synthesizing diopside is less labor-intensive and time-consuming, but more energy-intensive due to the higher synthesis temperature of diopside.
Methods. X-ray quantitative phase analysis was used to analyse the obtained samples of synthetic wollastonite and diopside. The porosity of calcium-magnesium silicates was evaluated by a static volumetric method using low-temperature nitrogen adsorption. The elemental composition of the samples was determined using an Oxford INCA X-max 80 energy dispersive detector, and electron microscopic analysis was performed using a Jeol JSM7001F scanning microscope.
Results. Experimental data comparing the properties of synthesized diopside and wollastonite showed that wollastonite is characterized by high porosity and average particle size compared to diopside due to the lower temperature of solid-phase synthesis. The structure of synthetic wollastonite is distinguished by the presence of large irregularly shaped inclusions with a small amount of needle-like particles, while synthesized diopside does not contain needle-like particles, and the inclusions are characterized by smaller size and uniform distribution throughout the volume.
Conclusions. When obtaining calcium-magnesium silicates by solid-phase synthesis based on rice husk ash, the yield of the final product synthetic diopside is significantly higher than that of synthetic wollastonite. The process of synthesizing diopside is less labor-intensive and time-consuming, but more energy-intensive due to the higher synthesis temperature of diopside.