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  • Title: Study of CO2 cyclic absorption stability of CaO-based sorbents derived from lime mud purified by sucrose method.
    Author: Ma A, Jia Q, Su H, Zhi Y, Tian N, Wu J, Shan S.
    Journal: Environ Sci Pollut Res Int; 2016 Feb; 23(3):2530-6. PubMed ID: 26423292.
    Abstract:
    Using lime mud (LM) purified by sucrose method, derived from paper-making industry, as calcium precursor, and using mineral rejects-bauxite-tailings (BTs) from aluminum production as dopant, the CaO-based sorbents for high-temperature CO2 capture were prepared. Effects of BTs content, precalcining time, and temperature on CO2 cyclic absorption stability were illustrated. The cyclic carbonation behavior was investigated in a thermogravimetric analyzer (TGA). Phase composition and morphologies were analyzed by XRD and SEM. The results reflected that the as-synthesized CaO-based sorbent doped with 10 wt% BTs showed a superior CO2 cyclic absorption-desorption conversion during multiple cycles, with conversion being >38 % after 50 cycles. Occurrence of Ca12Al14O33 phase during precalcination was probably responsible for the excellent CO2 cyclic stability.
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