The effect of Cr2O3 and P2O5 additions on the phase transformations during the formation of calcium sulfoaluminate C4A3S¯

Benarchid, My.Y.; Rogez, J.

doi:10.1016/j.cemconres.2005.06.005

Cited by 27 publications

(13 citation statements)

References 17 publications

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“…However, the SO 3 amounts are significantly lower than the nominal values, which might hint that ye'elimite might form and then decompose into CA phases and sulfur oxide (that volatilizes), especially in samples CBA‐20 and CBA‐26.7 where high contents of P 2 O 5 are present. Based on the literature, it seems the presence of phosphorus might enlarge the stability field of the CA phase as opposed to the C 4 A 3 $ field 23,24,56 . This is confirmed in Figure 10, where weight loss is observed in all samples at high firing temperatures which might be related to the decomposition of ye'elimite.…”

Section: Resultssupporting

confidence: 53%

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Duvallet

Jewell

2023

J Am Ceram Soc.

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The purpose of this research is to demonstrate the utilization of animal wastes and by-products in the production of low-energy and low-CO 2 clinkers and cements in order to preserve natural resources, such as limestone, while reducing CO 2 emissions released from the cement manufacturing process and reducing potential health risk to the world population (such as bovine spongiform encephalopathy or other health issues. . . ). Pure calcium sulfoaluminate clinker was produced with calcium hydroxide, aluminum hydroxide, and calcium sulfate hemihydrate; followed by additional clinkers produced from substituting calcium hydroxide with bone ash (from 0 to 100% of the calcium hydroxide replaced). The final clinkers contained various amounts of ye'elimite, calcium aluminate phases, as well as tricalcium phosphate, depending on the firing temperature. Finally, some preliminary results on the hydration process and compressive strength are provided for the production of these binders.

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Section: Resultssupporting

confidence: 53%

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Duvallet

Jewell

2023

J Am Ceram Soc.

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“…All samples had similar weight loss results, thus the TG-DSC pattern of GF-2 was selected as the representative result and is shown in Figure 7. A two-stage weight loss process was observed: the obvious weight loss with the endothermic peak between 100 °C and 200 °C corresponded to the decomposition of AFt [36]; another obvious weight loss with an endothermic peak between 400 °C and 500 °C corresponded to the decomposition of CH. Detailed weight losses at each stage for all samples are listed in Table 7.…”

Section: Hydration Of Bbscmentioning

confidence: 99%

“…Brownmillerite might promote the formation of C2AS•8H2O according to Equations ( 9), ( 10) and ( 13) and influence the morphologies of AFt. In short, the hydration process of BBSCs can be clearly divided into two steps: the first one corresponds to the hydration of C 4 A 3 $ and brownmillerite at an early age, and the second one involves the contributions of belite and brownmillerite hydration [36]. Brownmillerite might promote the formation of C 2 AS•8H 2 O according to Equations ( 9), ( 10) and ( 13) and influence the morphologies of AFt.…”

Section: Hydration Of Bbscmentioning

confidence: 99%

“…As the hydration reaction proceeded, C 2 S participated in the hydration reaction according to Equation (13). As shown in Figure 5, the interwoven grass-like AFt increased with the increased content of brownmillerite, which filled the pores of the hardened pastes and increased the toughness of the BBSC mortar, thus improving the flexural strength [36][37][38]. As mentioned in Figure 4, the higher the brownmillerite content in BBSC, the earlier the C 2 AS•8H 2 O formed [31,32], which is why the compressive strength of the GF-2 and GF-3 samples increased faster than that of sample GF-1.…”

Section: Mechanical Performance Of Bbscmentioning

confidence: 99%

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Preparation and Hydration of Brownmillerite-Belite-Sulfoaluminate Cement

Niu

et al. 2022

Materials

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Brownmillerite-belite-sulfoaluminate clinker with different contents of brownmillerite were designed and successfully prepared by using limestone (LS), aluminum tailings (AT), aluminum mine (AM), and anhydrite (AH) calcined at 1330 °C for 30 min. Then, three kinds of brownmillerite-belite-sulfoaluminate cement (BBSC) were obtained by grinding mixtures of the clinker and AH. Hydration and mechanical performances of the prepared BBSC were thus intensively studied. The increase in brownmillerite in BBSC decreased the hydration exothermic rate and delayed the renewed rapid formation of AFt at early hydration stages. However, the formation of C2AS·8H2O would be promoted, where the higher the brownmillerite content in BBSC, the earlier the C2AS·8H2O formed. The increase in brownmillerite might change the morphologies of the formed AFt, grass-shaped AFt enriched in iron would be the main hydration products in BBSC with a higher content of brownmillerite. The increase in brownmillerite content contributed to the stability improvement in flexural strength and the stable growth in the compressive strength of BBSC. The appropriate content of brownmillerite (20 wt%) can balance the whole hydration reaction process, which was conducive to the development of BBSC mechanical strength, the decrease in the hydration heat release, and the volume stability of hardened pastes.

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“…However, the improvement is not ideal at high temperatures, especially over 1200°C. In some studies, such additives as CeO 2 [1], Cr 2 O 3 [1,2], Fe 2 O 3 [3], MnO 2 [4], Al 2 O 3 [1], SiO 2 [1], and MgO [5,6], are added to calcium-based sorbent to generate hightemperature stable phases, such as 3CaO·3Al 2 O 3 ·CaSO 4 (i.e. C 4 A 3 S) [7,8], BaSO 4 , and Ca 5 (SiO 4 ) 2 SO 4 [9].…”

Section: Introductionmentioning

confidence: 99%

Improving the efficiency of CaO-based sorbent by SrCO3 for high-temperature sulfur removal during coal combustion

Gao

Yang

Zhu

et al. 2017

Green Processing and Synthesis

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With the goal of adding the appropriate amount of SrCO 3 to coal, the synergistic effects of SrCO 3 and desulfurization agents were studied by using a sulfur determination device and a carbon-sulfur spectrometer. Mineral constituents were investigated with an XRD diffraction analyzer. Results show that, at a given temperature, desulfurization efficiency increased in varying degrees based on the proportion of added SrCO 3 . An increasing amount of calcium sulphoaluminates also appeared in the ash residue. Meanwhile, SrCO 3 , sulfur capture capacity improved when the temperature reached 1200°C because of the large amount of generated calcium sulphoaluminates (3CaO·3Al 2 O 3 ·CaSO 4 ) and the controlled decomposition of CaSO 4 . At temperatures of 1200°C-1300°C, the ascending rate of the sulfur-fixing ratio decreased due to the sharp decomposition of CaSO 4 and the pyrolysis of a small amount of calcium sulphoaluminate. From 1300°C, the decomposition of increasing amounts of calcium sulphoaluminate gradually worsened the desulfurization. The diffraction peak of calcium sulphoaluminate was the strongest at 1300°C and the sulfur-fixing ratio was also the largest. Therefore, calcium sulphoaluminate reached the highest level at this temperature.

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The effect of Cr2O3 and P2O5 additions on the phase transformations during the formation of calcium sulfoaluminate C4A3S¯

Cited by 27 publications

References 17 publications

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Preparation and Hydration of Brownmillerite-Belite-Sulfoaluminate Cement

Improving the efficiency of CaO-based sorbent by SrCO3 for high-temperature sulfur removal during coal combustion

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