Abstract
Precipitated calcium carbonate (PCC) is synthetic calcium carbonate that has high purity of more than 98 wt% of CaCO3 content. Owing to its unique characteristic whereby its shape and size can be controlled to tailor to various applications, PCC has seen great demands in many industries such as paper, paint, plastic, food, ceramics, cosmetics, pharmaceutical, and many others. PCC can be synthesized via various methods and the most often used method in industry is via carbonation process. This process has caught interest of the oil and gas industry for utilizing existing carbon dioxide waste from plant processes. Precipitation of PCC is carried out using hydrated lime under various conditions at different gas purity (1 mol% CH4 + 99 mol% CO2 , 40 mol% CH4 + 60 mol% CO2 ), different gas flowrate, and different stirring rate. All experiments are carried out using 1 litre of ionic solution at ambient conditions. All samples are characterized using Field Emission Scanning Electron Microscopy (FESEM), Particle Size Distribution, X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). FESEM analysis shows different surface morphology for different methane content with calcite formation. The particle size for all PCC produced at different parameters are comparable at the range 5-9 microns depending on the mixing rate used whereas XRF results indicate very high purity of CaCO3 of more than 99 wt%.
Highlights
Calcium carbonate is one of the most abundant naturally occurring minerals which has attracted considerable attention as an important building material in organisms and as a starting material in many industries
Solid Ca(OH)2 powder is dissolved in the sucrose solution during ionic solution preparation
The effect of methane in the production of Precipitated Calcium Carbonate was investigated at various gas concentration, gas flowrate, and stirring rate
Summary
Calcium carbonate is one of the most abundant naturally occurring minerals which has attracted considerable attention as an important building material in organisms and as a starting material in many industries. Gaseous CO2 will be bubbled through the concentrated aqueous Ca(OH) slurry in a batch or semi-batch process This process requires high purity mineral feedstock with certain purity of CO2 as the starting material. With regards to impurities from mineral feedstock, a lot of studies have been conducted on utilizing industrial waste minerals such as alkaline ashes and steel slags as feedstock to produce high purity PCC [6 – 9]. This attractive path has the potential of becoming an alternative route for carbon sequestration [2, 10, 11]. A simple approach was used to synthesis PCC through carbonation of an ionic solution – calcium rich solution at atmospheric condition with different gas flowrate and stirring rate
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