Mechanism of CO₂ sequestration by high-alkaline red mud: conversion of katoite
by Zelin Su; Dongbo Wang; Xianqing Huang; Xiang Li; Xin Yu; Ying Huang; Qingge Feng
International Journal of Global Warming (IJGW), Vol. 22, No. 2, 2020

Abstract: Red mud (RM) is an alkaline solid waste, which can be carbonised and neutralised by sequestrating carbon dioxide (CO₂). Here, the CO₂ sequestration capacity of red mud was quantitatively characterised by elemental analyser, and the effects of liquid-solid ratio (2:1-10:1), reaction time (0-300 min), reaction pressure (2-12 bar) and reaction temperature (room temperature - 130°C) were studied in detail. In addition, both the red mud before and after carbonation were characterised by XRD, FT-IR, SEM and laser particle size analyser. The results showed that CO₂ could be sequestrated by red mud due to the mineral phase transformation of alkaline substances, which was that katoite converted to calcite and other substances with dissolving CO₂ and leaching Ca²⁺ in water medium.

Online publication date: Tue, 13-Oct-2020

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