Data from: Production of low-carbon amorphous precipitated silica and hydrated magnesium carbonate from olivine
Cite this dataset
Cheeseman, Chris et al. (2024). Data from: Production of low-carbon amorphous precipitated silica and hydrated magnesium carbonate from olivine [Dataset]. Dryad. https://doi.org/10.5061/dryad.vq83bk410
Abstract
A novel process is reported that produces amorphous silica and nesquehonite (MgCO3.3H2O) from the magnesium silicate mineral olivine ((Mg,Fe)2.SiO4). The amorphous silica formed is a supplementary cementitious material (SCM) for use in concrete. The formation of nesquehonite sequesters carbon and means that the overall process is carbon negative. Nesquehonite can also be used to form low-carbon construction products such as bricks, blocks, and boards. This paper reports on key process optimisation studies. The potential for amorphous precipitated silica derived from olivine to produce carbon-negative concrete is discussed.
README: Production of low-carbon amorphous precipitated silica and hydrated magnesium carbonate from olivine
https://doi.org/10.5061/dryad.vq83bk410
1. Title of dataset: Production of low-carbon amorphous precipitated silica and hydrated magnesium carbonate from olivine
2. Authors:
Barney Shanks - <b.shanks18@imperial.ac.uk>
Caitlin Howe - c.howe20@imperial.ac.uk
Sam Draper - <s.draper17@imperial.ac.uk>
Mike Cook - m.cook@imperial.ac.uk
Hong Wong* - hong.wong@imperial.ac.uk
Christopher Cheeseman* - c.cheeseman@imperial.ac.uk
* Corresponding authors
3. Affiliation:
Centre for Infrastructure Materials, Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United Kingdom
4. Date of data collection: 2022-2023
5. Geographic location of data collection: London, United Kingdom
6. Description of the data and file structure
Filename: ProcessPaperData.xlsx
Description: Excel file containing experimental data organised into eight individual worksheets. Each sheet contains the raw and processed data (where applicable) that are presented in the corresponding figures in the full paper.
Sheet #1: Figure 3
Description: X-ray diffraction data of the as-received olivine. Two-theta CuKa (°) and intensity (counts).
Sheet #2: Figure 4
Description: Laser diffraction particle size distribution data of the as-received olivine. Size (mm) and volume density (%).
Sheet #3: Figure 6 & 7
Description: Concentration of M2+ ions (mol dm-3) in the slurry produced during olivine dissolution as a function of H2SO4 acid concentration (1M, 1.5M, 2M, 2.5M, 2.75M), time (minutes) and reaction completion time (minutes), defined as the time at which 99% of the theoretical maximum dissolution Cm is achieved. For each acid concentration, 10% molar excess of olivine was used. Abbreviations: Vsmp is the volume of sample used in the titration in millilitres. Vedta is the volume of ethylene tetra-acetic acid used in the titration in millilitres. Conc is the calculated concentration of magnesium in the sample in Mol/L. Cavrg is the average concentration for replicate measurements in Mol/L.
Sheet #4: Figure 8 & 9
Description: Influence of initial MgSO4 concentration (mol dm-3) and IPA: MgSO4 volume ratio in the simplified experiments on the concentration of Mg2+ (mol dm-3) in the organic-rich layer. Also contains data showing the influence of M2+ concentration (mmol dm-3) in the organic-rich layer after olivine dissolution and separation on the impurities in the extracted silica (60°C dried, unwashed) at different IPA: slurry volume ratios. The abbreviations used are the same as in Sheet #3. The sample ID denotes the phase from which a sample was extracted, organic or aqueous, and the volume of the organic phase. Eg 5 ml aq denotes the sample taken from the aqueous phase of the sample to which 5 millilitres of isopropyl alcohol was added.
Sheet #5: Figure 10
Description: X-ray diffraction data of the extracted silica (60°C dried, unwashed) containing a) 27.0% impurities and b) 84.8% impurities. Two-theta CuKa (°) and intensity (counts).
Sheet #6: Figure 12
Description: Change in Mg2+ concentration (mmol dm-3) during carbonation of the synthetic MgSO4 solution (0.4 and 0.5M), and the 0.5M (Mg,Fe).SO4 solution from olivine dissolution showing a 3-stage reaction. The abbreviations used are the same as in Sheet #3.
Sheet #7: Figure 13
Description: X-ray diffraction data of precipitates from carbonation of a) olivine derived (Mg,Fe).SO4, and b) synthetic MgSO4 solutions. Two-theta CuKa (°) and intensity (counts).
Sheet #8: Figure 14
Description: Mass loss (%), differential scanning calorimetry (DSC, mW/mg) and derivative thermogravimetry (DTG, %/min) data of precipitates from carbonation of olivine derived (Mg,Fe).SO4 evaluated using simultaneous thermal analysis.
Funding
Engineering and Physical Sciences Research Council, Award: EP/L016826/1, CDT