Investigation of Carbonic Anhydrase Assisted Carbon Dioxide Sequestration using Steelmaking Slag


Batch aqueous leaching and carbonation tests were conducted using industrial steelmaking slags to determine the effect of carbonic anhydrase enzyme as a catalyst. Calcium leaching is a strong function of particle surface area, and the extent can be expressed as a function of time and particle size. Carbonic anhydrase did not affect the calcium-leaching rate, however, it did catalyze calcium carbonate formation to achieve a neutralization time near the theoretical rate. Additionally, carbonic anhydrase modified the precipitate morphology due to accelerated particle nucleation. Time controlled tests in which the pH dropped to -6 decreased the amount of carbonate produced, and this effect was exaggerated by carbonic anhydrase, while pH controlled tests (>8.5) exhibited the highest rate of carbonation. Because the leaching rate was -50% faster than the carbonation rate, a further increase in the amount of carbonation may be realized by using carbonic anhydrase however pH must be >10.3.


Materials Science and Engineering

Research Center/Lab(s)

Peaslee Steel Manufacturing Research Center

Keywords and Phrases

Calcium Leaching; Carbon Dioxide Sequestration; Carbonic Anhydrase Enzyme; Steelmaking Slag

Document Type

Article - Conference proceedings

Document Version


File Type





© 2009 The Minerals, Metals & Materials Society (TMS), All rights reserved.

Publication Date

01 Feb 2009

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