Eco-friendly binders are among the opportunities to reduce the approximately 8% global CO₂ emissions generated by the cement industry, with calcium-sulphoaluminate (CSA) -based cements standing as a potential low-CO₂ alternative to the world most used ordinary Portland cements (OPC). Belterra Clay (BTC), an abundant low-cost alumina-rich clay overburden on the huge bauxite reserves of the Brazilian Amazon was tested to produce CSA-based binders. Successive Designs of Experiments were used to prepare mixtures containing BTC, CaCO₃, and gypsum, seeking the maximum BTC and minimal CaCO₃ consumption under the lowest possible temperature to maximize CSA's main phase ye'elimite, Ca₄Al₆(SO₄)O₁₂, in the clinkers. X-ray powder diffraction accompanied by Rietveld phase quantifications, X-ray fluorescence, and scanning electron microscopy were used to characterize the obtained products and guide the experimental work. CSA-belite and CSA-ternesite clinkers were successfully sintered at 1250 °C using up to 42% of BTC. The hydration of selected clinkers was investigated by isoperibolic heat flow calorimetry after blending with gypsum at 95:5 and 90:10 mass ratios. The main hydrations of the clinkers were faster (within 24 h) when using 5% of gypsum. Ettringite was the main hydrated phase, followed by kuzelite, straetlingite, and hemicarboaluminate. Produced mortars reached up to 40 Mpa after 28 days of curing, a strength development comparable to that of an OPC (46 Mpa) tested under the same conditions. BTC, currently a drawback during bauxite mining and rehabilitation of mined areas, was successfully used to produce clinkers that generate ca. 30% less CO₂ during calcination when compared to OPC, with further CO₂ and energy savings expected because of the required lower sintering temperature.

环保粘合剂是减少水泥行业产生的大约 8% 的全球 CO ₂排放的机会之一，基于硫铝酸钙 (CSA) 的水泥是世界上最常用的普通波特兰水泥的潜在低 CO ₂替代品水泥（OPC）。Belterra Clay (BTC) 是一种位于巴西亚马逊巨大铝土矿储量上的丰富的低成本富含氧化铝的粘土覆盖层，经过测试可生产基于 CSA 的粘合剂。连续的实验设计用于制备含有 BTC、CaCO ₃和石膏的混合物，在尽可能低的温度下寻求最大的 BTC 和最小的 CaCO ₃消耗，以最大限度地利用 CSA 的主相 ye'elimite、Ca ₄ Al ₆ (SO₄ )O ₁₂，在熟料中。X 射线粉末衍射伴随 Rietveld 相定量、X 射线荧光和扫描电子显微镜用于表征所得产物并指导实验工作。CSA-belite 和 CSA-ternesite 熟料在 1250 °C 下使用高达 42% 的 BTC 成功烧结。在与石膏以 95:5 和 90:10 的质量比混合后，通过等周热流量热法研究选定熟料的水合。当使用 5% 的石膏时，熟料的主要水合速度更快（24 小时内）。钙矾石是主要的水合相，其次是kuzelite、菱镁矿和半碳铝酸盐。生产的砂浆在固化 28 天后达到 40 Mpa，强度发展可与在相同条件下测试的 OPC (46 Mpa) 相媲美。比特币，目前铝土矿开采和矿区恢复过程中的一个缺点，已成功用于生产熟料，产生约 二氧化碳减少 30%₂与 OPC 相比，在煅烧过程中，由于所需的烧结温度较低，预计会进一步节省CO ₂和能源。