Ex Situ CO2 capture by carbonation of steelmaking slag coupled with metalworking wastewater in a rotating packed bed

Shu Yuan Pan, Pen Chi Chiang, Yi Hung Chen, Chung Sung Tan, E. E. Chang

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Both basic oxygen furnace (BOF) slag and cold-rolling wastewater (CRW) exhibiting highly alkaline characteristics require stabilization and neutralization prior to utilization and/or final disposal. Using CO2 from flue gases as the stabilizing and neutralizing agents could also diminish CO2 emissions. In this investigation, ex situ hot stove gas containing 30 vol% CO2 in the steelmaking process was captured by accelerated carbonation of BOF slag coupled with CRW in a rotating packed bed (RPB). The developed RPB process exhibits superior results, with significant CO2 removal efficiency (η) of 96-99% in flue gas achieved within a short reaction time of 1 min at 25 C and 1 atm. Calcite (CaCO3) was identified as the main product according to XRD and SEM-XEDS observations. In addition, the elimination of lime and Ca(OH)2 in the BOF slag during carbonation is beneficial to its further use as construction material. Consequently, the developed RPB process could capture the CO2 from the flue gas, neutralize the CRW, and demonstrate the utilization potential for BOF slag. It was also concluded that carbonation of BOF slag coupled with CRW in an RPB is a viable method for CO2 capture due to its higher mass transfer rate and CO2 removal efficiency in a short reaction time.

Original languageEnglish
Pages (from-to)3308-3315
Number of pages8
JournalEnvironmental Science and Technology
Volume47
Issue number7
DOIs
Publication statusPublished - Apr 2 2013

Fingerprint

Basic oxygen converters
Carbonation
Steelmaking
Packed beds
Waste Water
slag
Slags
Cold rolling
Wastewater
Oxygen
wastewater
oxygen
Gases
Flue gases
Gas stoves
Waste utilization
Calcium Carbonate
Excipients
neutralization
Waste disposal

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Medicine(all)

Cite this

Ex Situ CO2 capture by carbonation of steelmaking slag coupled with metalworking wastewater in a rotating packed bed. / Pan, Shu Yuan; Chiang, Pen Chi; Chen, Yi Hung; Tan, Chung Sung; Chang, E. E.

In: Environmental Science and Technology, Vol. 47, No. 7, 02.04.2013, p. 3308-3315.

Research output: Contribution to journalArticle

Pan, Shu Yuan ; Chiang, Pen Chi ; Chen, Yi Hung ; Tan, Chung Sung ; Chang, E. E. / Ex Situ CO2 capture by carbonation of steelmaking slag coupled with metalworking wastewater in a rotating packed bed. In: Environmental Science and Technology. 2013 ; Vol. 47, No. 7. pp. 3308-3315.
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