A Novel Indirect Wollastonite Carbonation Route for CO₂ Sequestration

Abstract

A new CO 2 sequestration approach through indirect wollastonite carbonation is proposed to mitigate anthropogenic CO 2 emissions from fossil fuel combustion. The wollastonite carbonation process includes three steps: (1) dissolution of wollastonite in hydrochloric acid to leach Ca 2+ from mineral matrix; (2) reaction of the resulting CaCl 2 solution with CO 2 in triisooctylamine (TIOA) at low temperature, producing CaCO 3 and an amino acid complex; (3) regeneration of the extractant and acid by backextraction through a temperature swing process and recycling to the dissolution and carbonation steps. It was found that the wollastonite dissolution rate was accelerated by hydrochloric acid and a maximum Ca 2+ dissolution extent of 95 % was obtained.

Mineralization of Carbon Dioxide: A Literature Review

“…There are a variety of indirect methods being studied, most of which involve varying the pH of the solution [187,188]. Generally, indirect carbonation involves a minimum of two steps: extraction of the Ca or Mg reactive components, and reaction with carbon dioxide to form carbonates.…”

Sustainable Energy through Carbon Capture and Storage: Role of Geo-Modeling Studies

“…Several studies have been made to study mineral reactivity, energy balance, intense grinding in presence of gaseous CO 2 and dynamics of CO 2 in pores [20]. Rock-Eval analysis [21] to quantify carbonation yields has revealed that a highly reactive system will rapidly obstruct and limit pore space volume in an ultramafic formation with important consequences in terms of reactivity and injectivity.…”

Carbon Capture and Storage Technology for Sustainable Energy

“…To test efficacy of artificial weathering, pilot experiments are being carried out to study mineral reactivity, energy balance, type of CO 2 injection and dynamics of CO 2 in pores. Naturally occurring silicate materials like forsterite, wollastonite and synthetic magnesium silicates have been studied by intense grinding in presence of gaseous CO 2 (Zhana et al, 2010). In a biomimetic process (Liu et al, 2005) enzyme carbonic anhydrase as catalyst was used to accelerate the rate of precipitation of mineral carbonate with industrial wastewater as cation source.…”