Chlorellestadite (ideal formula of Ca₁₀(SiO₄)₃(SO₄)₃Cl₂, CE) is an intermediate phase during ordinary Portland cement preparation and a potential component of the synthesized ecological clinker from solid wastes when sulfate and chlorine coexist. This study synthesized pure CE at 1100 °C with the assistance of theoretical thermodynamic calculations and revealed its carbonation reactivity. Analytical investigations were conducted to reveal the carbonation reactivity of CE and underlie the mechanism of strength development, including mineralogy and microstructural characterization. CE pastes could sequester 4.8% (by mass) of CO₂ and develop a compressive strength of 25.8 MPa after being subjected to 1 day carbonation curing with vaterite, gypsum, calcium chloride, and silica gel as carbonation products, far higher than that under normal hydraulic curing (1.5 MPa). It is concluded that CE is a carbonation-reactive and weakly hydraulic compound. The advantages of CE are not only the possibility to use sulfate- and chlorine-contained wastes as raw materials for synthesis to reduce the environmental risk of wastes but also to develop strength under carbonation curing to be a potential binder.

中文翻译：

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小球橄榄石Ca10(SiO4)3(SO4)3Cl2的合成及碳化反应活性

小球藻（Ca ₁₀ (SiO ₄ ) ₃ (SO ₄ ) ₃ Cl ₂，CE）是普通硅酸盐水泥制备过程中的中间相，也是硫酸盐和氯共存时固体废物合成生态熟料的潜在组分。本研究借助理论热力学计算在 1100 °C 下合成了纯 CE，并揭示了其碳酸化反应活性。我们进行了分析研究，以揭示 CE 的碳化反应性以及强度发展的机制，包括矿物学和微观结构表征。以球霰石、石膏、氯化钙、硅胶为碳化产物的CE糊料经1天碳化养护后，可封存4.8%（质量）的CO ₂ ，​​抗压强度达到25.8 MPa，远高于正常情况下的抗压强度。液压固化（1.5 MPa）。结论是CE是一种碳酸化反应性弱水硬性化合物。 CE的优点不仅在于可以使用含硫酸盐和含氯废物作为合成原料以降低废物的环境风险，而且可以在碳化固化下发挥强度，成为潜在的粘合剂。