Dissolution of natural serpentinite in mineral and organic acids

Teir, Sebastian; Revitzer, Hannu; Eloneva, Sanni; Fogelholm, Carl-Johan; Zevenhoven, Ron

doi:10.1016/j.minpro.2007.04.001

Cited by 281 publications

(193 citation statements)

References 14 publications

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“…This textural duality 43 was enhanced during prolonged acid-leaching, with greater Mg-extraction being observed from the 44 serpentine-like material. The other lizardite 2H 1 sample (Liz3) was more-homogeneous texturally 45 and generally less-crystalline than Liz2, as indicated by peak broadening in the associated XRD 46 pattern in contrast to the sharp diffraction peaks for Liz2 2H1 (Lacinska, PhD thesis concentric Mg-depletion and siliceous layer formation, commonly termed leached layers [Hellmann 49 et al, 1990;Hellmann et al, 2003;Teir et al, 2007;Weissbart and Rimstidt, 2000 and references 50 therein]. SEM-EDS data demonstrated that the amount of Mg within the Liz3 2H1 core material was 51 similar to that in the starting material, i.e.…”

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confidence: 99%

Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

et al. 2016

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Serpentine minerals serve as a Mg donor in carbon capture and storage by mineralisation (CCSM).The acid-treatment of nine comprehensively-examined serpentine polymorphs and polytypes, and the subsequent microanalysis of their post-test residues highlighted several aspects of great importance to the choice of the optimal feed material for CCSM. Compelling evidence for the nonuniformity of serpentine mineral performance was revealed, and the following order of increasing Mg extraction efficiency after three hours of acid-leaching was established: Al-bearing polygonal serpentine (<5%) ≤ Al-bearing lizardite 1T (≈5%) < antigorite (24-29%) < well-ordered lizardite 2H 1 (≈65%) ≤ Al-poor lizardite 1T (≈68%) < chrysotile (≈70%) < poorly-ordered lizardite 2H 1 (≈80%) < nanotubular chrysotile (≈85%).It was recognised that the Mg extraction efficiency of the minerals depended greatly on the intrinsic properties of crystal structure, chemistry and rock microtexture. On this basis, antigorite and Albearing well-ordered lizardite were rejected as potential feedstock material whereas any chrysotile, non-aluminous, widely spaced lizardite and/or disordered serpentine were recommended.The formation of peripheral siliceous layers, tens of microns thick, was not universal and depended greatly upon the intrinsic microtexture of the leached particles. This study provides the first comprehensive investigation of nine, carefully-selected serpentine minerals, covering most varieties and polytypes, under the same experimental conditions. We focused on material characterisation and the identification of the intrinsic properties of the minerals that affect particle's reactivity. It can therefore serve as a generic basis for any acid-based CCSM pre-treatment.

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confidence: 99%

Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

et al. 2016

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“…Following treatment at 250°C for 1 hour, the optical properties changed in the presence of 1 M oxalic acid, but not 0.3 or 0.5 M. The width RI began to exhibit significant differences at 1 M oxalic acid, and changed little with increased treatment duration. It is hypothesized that chemical digestion occurred through release of hydrogen ions due to the acid reacting with the surface of the chrysotile in the soils and rocks (Jeyaratnam and West, 1994;Teir et al, 2007). Following this reaction, magnesium is extracted from the asbestos structure (Jeyaratnam and West, 1994;Teir et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…It is hypothesized that chemical digestion occurred through release of hydrogen ions due to the acid reacting with the surface of the chrysotile in the soils and rocks (Jeyaratnam and West, 1994;Teir et al, 2007). Following this reaction, magnesium is extracted from the asbestos structure (Jeyaratnam and West, 1994;Teir et al, 2007). In the preliminary assessment of the combination treatment, NOA did not exhibit changes at temperatures < 200°C for short treatment durations.…”

Section: Discussionmentioning

confidence: 99%

Optimal Treatment Condition for Changing Characteristics of Naturally Occurring Asbestos

Lee

Yoon

Ham

et al. 2015

Aerosol Air Qual. Res.

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Naturally occurring asbestos (NOA) refers to asbestos found as a natural component of rocks and soils. The purpose of this study was to determine effective methods for changing the characteristics of NOA. Unprocessed chrysotile-containing soils and rocks were treated using heat (700-1100°C for 1-3 hours) and combination (100-250°C, 0.3-1.0 M oxalic acid for 1-3 hours) methods. A polarized light microscope (PLM) and field emission scanning electron microscope (FE-SEM) with an energy-dispersion spectrometer (EDS) were used for the analysis of both untreated and treated samples. While PLM analyses revealed gradual change in optical properties in both heat and combination treatments, SEM/EDS analyses revealed morphological and chemical changes under conditions of combination treatment. The elemental composition of combination treated samples showed low levels of magnesium and high levels of silicon compared to untreated samples. The optimal treatment condition was 1 M oxalic acid at 250°C temperature for 1 hour. Combination treatment resulted in changes in NOA characteristics at lower temperatures than did heat treatment alone.

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“…); finally (3) the combination of carbonate anion and metal cation to form the carbonate minerals [24,25]. In these reactions, the mineral dissolution reaction is the rate-determining step [35], thus enhancing mineral dissolution reaction will also yield faster mineralization.…”

Section: Introductionmentioning

confidence: 99%

Carbonate formation on ophiolitic rocks at different pH, salinity and particle size conditions in CO2-sparged suspensions

Magbitang

Lamorena

2016

Int J Ind Chem

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Mineral carbonation is a promising CO 2 sequestration strategy that offers a long-lasting and environmentally safe solution. In this study, the effect of pH, salinity and particle size in the mineral carbonation process was investigated. Ultramafic-mafic rock samples were collected from different ophiolite rock sampling sites in Luzon Island, Philippines, and these were used in mineral carbonation reaction. Dissolution experiments were conducted by exposing powdered rock samples in suspensions sparged with CO 2 for 60 days at ambient conditions (25°C and 1 bar). Carbonation reactions were observed at various pH conditions (4, 6, and 10) and particle sizes (62-125 and 250-420 lm). In separate experiments, the effects of pH and salinity were studied in experimental set-ups containing 5 % MgCl 2 maintained at low and high pH. Inductively coupled plasma-mass spectrometry (ICP-MS) was used to monitor concentrations of metals that could participate in the mineralization reaction (Mg, Al, Ca, and Fe) during exposure to CO 2 . X-ray diffraction (XRD) analysis was used to confirm the formation of carbonate minerals. Results indicate an enhancement in the carbonation process upon varying pH and salinity of the system, while there is a negligible difference in the mineral carbonation reaction at the range of particle sizes used in this study.

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Dissolution of natural serpentinite in mineral and organic acids

Cited by 281 publications

References 14 publications

Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

Optimal Treatment Condition for Changing Characteristics of Naturally Occurring Asbestos

Carbonate formation on ophiolitic rocks at different pH, salinity and particle size conditions in CO2-sparged suspensions

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