Producing cement clinker assemblages in the system: CaO-SiO2-Al2O3-SO3-CaCl2-MgO

Simoni, Marco; Hanein, Theodore; Duvallet, Tristana Y.; Jewell, Robert B.; Provis, John L.; Kinoshita, Hajime

doi:10.1016/j.cemconres.2021.106418

Cited by 13 publications

(11 citation statements)

References 42 publications

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“…However, when WIFA was added with CaClOH again, a new calcium aluminum chloride phase (Ca 19.2 Mg 2.8 )(Si 0.75 Al 0.25 ) 8 O 36 Cl 2 with alinite structure was found in WIFA–CaClOH. Unlike WIFA–CaClOH, for raw IFA, besides the formation of (Ca 19.2 Mg 2.8 )(Si 0.75 Al 0.25 ) 8 O 36 Cl 2 , the formation of a new phase chlorellestadite (Ca 10 (SiO 4 ) 3 (SO 4 ) 3 Cl 2 , a member of ellestadite group) was observed due to the presence of a CaSO 4 component and was also found in other studies. ,, …”

Section: Resultssupporting

confidence: 72%

“…For the CaClOH−Al 39 and was also found in other studies. 10,13,40 In the control experiments as shown in Figure S4, calcium aluminum chloride phases have not been observed in the WIFA mixed with NaCl or KCl after being calcined at 1100 °C.…”

Section: Transformation Of Cacloh During Thermal Treatmentmentioning

confidence: 95%

“…In addition, chlorellestadite and wadalite phases formed in IFA systems had typical alinite structure characteristics, and the strong and stable binding ability of the alinite crystal structure to chloride ions is widely accepted and has become basic knowledge. 39,42 3.4. Distributions of Chlorine in IFA-Derived Products.…”

Section: Transformation Of Cacloh During Thermal Treatmentmentioning

confidence: 99%

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Controlling Role of CaClOH in the Process of Dechlorination for Municipal Solid Incineration Fly Ash Utilization

et al. 2022

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The existence of high chlorine components in municipal solid waste incineration fly ash (IFA) has become a key bottleneck in the utilization of IFA as building materials. In this work, the chlorides in IFA were classified as alkali chlorine, calcium chloride, and calcium aluminum chloride, whereas CaClOH was the dominant phase of calcium chloride. For the first time, the effects of CaClOH on chlorine elimination for IFA-derived products by water-washing treatment or high-temperature treatment were carefully examined. The results indicated that IFA chlorine removal was closely linked to CaClOH phase dissolution, decomposition, volatilization, and transformation. CaClOH was easily removed by water washing and had excellent thermostability, even at 1300 °C. As shown in the results of XRD and XRF, the siliceous component would combine with CaClOH to volatilize as SiCl4, whereas the aluminous component would react with CaClOH to form chlorine-fixed and stable calcium aluminum chloride phases. The calcium aluminum chloride instead of CaClOH was in favor of the transformation of residual chlorine from soluble chlorine to chemically fixed chlorine. Therefore, the detoxification mechanism of chlorine for IFA could be summarized as washing dechlorination, volatilization dechlorination, and chemical fixation. As an application, the synergistic treatment of IFA with siliceous/aluminous materials could greatly reduce risks from soluble chlorine, while IFA-derived products were used as building materials.

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Section: Resultssupporting

confidence: 72%

Section: Transformation Of Cacloh During Thermal Treatmentmentioning

confidence: 95%

Section: Transformation Of Cacloh During Thermal Treatmentmentioning

confidence: 99%

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Controlling Role of CaClOH in the Process of Dechlorination for Municipal Solid Incineration Fly Ash Utilization

et al. 2022

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“…20 Regarding Cl 2 , its disposal might partially be performed through recycling into Cl-based cements, such as alinite. 21,22 As shown in eq 1, the alternative decarbonization route leads to the synthesis of Ca(OH) 2 , which can also be converted to CaO in mild conditions through dehydroxylation, Ca(OH) 2 → CaO + H 2 O, 7 while sequestrating the process CO 2 into a stable mineral form, i.e., Na 2 CO 3 •xH 2 O (x = 0 and 1). (1)…”

Section: Introductionmentioning

confidence: 99%

“…Despite this, since the chlor-alkali process is mainly sustained by electric energy, the NaOH production would be expected to be carbon-neutral by 2050 if the goals set up during the Paris agreement in 2015 will be met . Regarding Cl 2 , its disposal might partially be performed through recycling into Cl-based cements, such as alinite. , As shown in eq , the alternative decarbonization route leads to the synthesis of Ca(OH) 2 , which can also be converted to CaO in mild conditions through dehydroxylation, Ca(OH) 2 → CaO + H 2 O, while sequestrating the process CO 2 into a stable mineral form, i.e., Na 2 CO 3 · x H 2 O ( x = 0 and 1). …”

Section: Introductionmentioning

confidence: 99%

Effect of Impurities on the Decarbonization of Calcium Carbonate Using Aqueous Sodium Hydroxide

Simoni

Hanein

Woo

et al. 2022

ACS Sustainable Chem. Eng.

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Decarbonizing calcium carbonate (CaCO 3 ) is a crucial step for a wide range of major industrial processes and materials, including Portland cement (PC) production. Apart from the carbon footprint linked to fuel combustion, the process CO 2 embodied within CaCO 3 represents the main concern for the sustainability of production. Our recent works demonstrated that it is possible to avoid both the fuel and process CO 2 by reacting CaCO 3 with aqueous NaOH and obtain Ca(OH) 2 and Na 2 CO 3 · x H 2 O ( x = 0 and 1). This present study provides a further understanding of the process by testing different raw calcareous sources. A high decarbonization (∼80%) of CaCO 3 was achieved for silica-rich chalk, whereas a lower extent was obtained (∼50%) for limestone. To understand the difference in their reaction behavior, the effect of impurities was studied. The effects of the major impurities (Si, Al, and Fe) were found to be marginal, which is advantageous to process industrial grade materials, while the morphology of the raw materials presents a significant impact. The applicability of our decarbonization technology was also demonstrated on magnesite (MgCO 3 ).

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Controlling the soundness of Portland cement clinker synthesized with solid wastes based on phase transition of MgNiO2

Tang

Zhao

et al. 2022

Cement and Concrete Research

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Producing cement clinker assemblages in the system: CaO-SiO2-Al2O3-SO3-CaCl2-MgO

Cited by 13 publications

References 42 publications

Controlling Role of CaClOH in the Process of Dechlorination for Municipal Solid Incineration Fly Ash Utilization

Controlling Role of CaClOH in the Process of Dechlorination for Municipal Solid Incineration Fly Ash Utilization

Effect of Impurities on the Decarbonization of Calcium Carbonate Using Aqueous Sodium Hydroxide

Controlling the soundness of Portland cement clinker synthesized with solid wastes based on phase transition of MgNiO2

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