Insights into the direct carbonation of activated lizardite: The identification a poorly reactive amorphous Mg-rich silicate phase

Rausis, Kwon; Cwik, Agnieszka; Casanova, I.

doi:10.1016/j.ijggc.2020.103114

Cited by 9 publications

(8 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…XRD patterns had broad humps from 17 to 43° (2Θ) in all heat-treated samples (Figure 2, curve 2), suggesting the presence of an amorphous component [15]. Heat-treated chrysotile (SCH) and lizardite (SLH, SLK) samples did not contain crystallized serpentine minerals.…”

Section: Characteristics Of Heat-treated Serpentinesmentioning

confidence: 99%

See 1 more Smart Citation

Magnesium Silicate Binding Materials Formed from Heat-Treated Serpentine-Group Minerals and Aqueous Solutions: Structural Features, Acid-Neutralizing Capacity, and Strength Properties

et al. 2022

View full text Add to dashboard Cite

The influence of structural features of three serpentine-group minerals (antigorite, chrysotile, and lizardite) on the hydration of heat-treated materials and the formation of magnesium silicate binder has been studied. Initial serpentine samples have been fired in the interval 550–800 °C with a step of 50 °C; acid neutralization capacity (ANC) values have been determined for all samples. Antigorite samples (SAP) have exhibited a maximum reactivity at a temperature of 700 °C (ANC 7.7 meq/g). We have established that the acid-neutralizing capacity of chrysotile and lizardite samples in the temperature range of 650–700 °C differ slightly; the capacity varied in the interval of 19.6–19.7 meq/g and 19.6–19.7 meq/g, respectively. The samples obtained at optimal temperatures (antigorite—700 °C, lizardite, and chrysotile—650 °C) have been studied. Heat-treated serpentines have interacted with water vapor for a year; serpentine hydration has been investigated. The strength characteristics of the resulting binder agents were studied after 7, 28, 180, and 360 days. Upon hardening within 7 days, the strengths of the SAP and SCH samples have been almost the same (2.2 MPa), whereas this indicator for the SLH and SLK samples has been significantly lower (0.5 MPa). After hardening for over a year, the chrysotile sample SCH had the highest strength (about 8 MPa), whereas the strength of antigorite SAP was 3 MPa. The samples of initial, heat-treated, and hydrated heat-treated serpentines have been studied using XRD, differential scanning calorimetry, and surface texture analysis. The serpentine structure is crucial in destroying the mineral crystal lattice during heat treatment. In contrast to heat-treated chrysotile and lizardite, antigorite did not adsorb water. Structural features of chrysotile provided the highest compressive strength of the binding agent compared with antigorite and lizardite. The acid-neutralizing ability of lizardite was noticeably higher than antigorite, whereas its compressive strength was lower due to the layered mineral structure and impurities. We have established that the minerals’ structural features are crucial for the hydration of heat-treated serpentines; the structure determines material utilization in various environmental technologies.

show abstract

Section: Characteristics Of Heat-treated Serpentinesmentioning

confidence: 99%

“…The alkaline properties of heat-treated serpentines are caused by the formation of a metastable phase. The phase interacts with solutions as a mixture of active oxides of magnesium and silicon [15]. The active phase forms during the destruction of the structure as a result of the dehydration of serpentine minerals.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Silicate Binding Materials Formed from Heat-Treated Serpentine-Group Minerals and Aqueous Solutions: Structural Features, Acid-Neutralizing Capacity, and Strength Properties

et al. 2022

View full text Add to dashboard Cite

show abstract

“…83 Because a DAC facility can provide on-site CO 2 generation anywhere, its application is advantageous in addition to its environmental benefits. Recently, the potential application of adsorption-based DAC in indoor air removal, 115,191,193,208,209 CO 2 fertilization, 178,210 biomass production, [211][212][213][214][215] fuel production (CH 4 , 68,70,75,[216][217][218][219][220][221][222] methanol, 71,[223][224][225][226] aviation fuel, 73,[227][228][229][230][231][232] hydrocarbons 233 ), chemicals (Fischer-Tropsch process, 234,235 carbon nanotubes, 236 dimethyl carbonate, 237 syngas 238,239 ), mineralization, [240][241][242][243][244] storage, 245,246 enhanced oil recovery (EOR), …”

Section: Overview Of Adsorption-based Dac Technologiesmentioning

confidence: 99%

“…Treatment strategies are being investigated to accelerate mineralization and base metal recovery. [241][242][243][244] 7.4.4. Conversion to fuels and chemicals.…”

Section: Applicationsmentioning

confidence: 99%