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Systematic Approach to Determination of Maximum Achievable Capture Capacity via Leaching and Carbonation Processes for Alkaline Steelmaking Wastes in a Rotating Packed Bed
journal contribution
posted on 2013-12-03, 00:00 authored by Shu-Yuan Pan, Pen-Chi Chiang, Yi-Hung Chen, Chun-Da Chen, Hsun-Yu Lin, E.-E. ChangAccelerated
carbonation of basic oxygen furnace slag (BOFS) coupled
with cold-rolling wastewater (CRW) was performed in a rotating packed
bed (RPB) as a promising process for both CO2 fixation
and wastewater treatment. The maximum achievable capture capacity
(MACC) via leaching and carbonation processes for BOFS in an RPB was
systematically determined throughout this study. The leaching behavior
of various metal ions from the BOFS into the CRW was investigated
by a kinetic model. In addition, quantitative X-ray diffraction (QXRD)
using the Rietveld method was carried out to determine the process
chemistry of carbonation of BOFS with CRW in an RPB. According to
the QXRD results, the major mineral phases reacting with CO2 in BOFS were Ca(OH)2, Ca2(HSiO4)(OH), CaSiO3, and Ca2Fe1.04Al0.986O5. Meanwhile, the carbonation product was
identified as calcite according to the observations of SEM, XEDS,
and mappings. Furthermore, the MACC of the lab-scale RPB process was
determined by balancing the carbonation conversion and energy consumption.
In that case, the overall energy consumption, including grinding,
pumping, stirring, and rotating processes, was estimated to be 707
kWh/t-CO2. It was thus concluded that CO2 capture
by accelerated carbonation of BOFS could be effectively and efficiently
performed by coutilizing with CRW in an RPB.