DOI: 10.5061/dryad.vq83bk410
title: Data from: Production of low-carbon amorphous precipitated silica and hydrated magnesium carbonate from olivine

description: 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.
description: # Production of low-carbon amorphous precipitated silica and hydrated
 magnesium carbonate from olivine
 1\. Title of dataset:
 Production of low-carbon amorphous precipitated silica and hydrated
 magnesium carbonate from olivine 2\. Authors: Barney Shanks -
 Caitlin Howe -
 Sam Draper -
 Mike Cook -
 Hong Wong* -
 Christopher Cheeseman* -
 \* 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.