Towards zero-waste mineral carbon sequestration via two-way valorization of ironmaking slag

Carbon Sequestration via Mineral Carbonation: Overview and Assessment

This report is being written for the Carbon Sequestration Initiative at the request of two members, GM and ChevronTexaco. The purpose is to give a brief overview and assessment of carbon sequestration by mineral carbonation (referred to as “mineral sequestration” in this report). The assessment is to highlight areas that need development in order for this technology to become commercial, not to...

Carbon Dioxide Sequestration by Carbonation of Steel Slag

Carbon Dioxide Sequestration In Alkaline Waste

The present study focuses on exploring an array of alkaline waste residues, procured from diverse sources as means for sequestering maximal CO2. Alkaline waste residues undertaken for the study included: (1) Cement Bag Filter Dust, (2) Finished Cement Sample, (3) Marble Dust and (4) Baghouse Dust. Experiments were conducted in a self fabricated Carbonation reactor under 80% CO2 concentration an...

Enhancing Process Kinetics for Mineral Carbon Sequestration

The current low-cost process for mineral carbonation involves the direct carbonation of a slurry of magnesium or calcium silicate mineral with supercritical CO2. The process is currently limited by the slow reaction kinetics of the carbonation reactions, and in particular the slow dissolution rates of the silicates in weakly acidic conditions. Enhancing the dissolution rate in weakly acidic con...

Hydrothermal Valorization of Steel Slags—Part I: Coupled H2 Production and CO2 Mineral Sequestration

A new process route for the valorization of BOF steel slags combining H2 production and CO2 mineral sequestration is investigated at 300°C (HT) under hydrothermal conditions. A BOF steel slag stored several weeks outdoor on the production site was used as starting material. To serve as a reference, room temperature (RT) carbonation of the same BOF steel slag has been monitored with in situ Rama...