Ribeiro Francisco Roger Carneiro, Modolo Regina Célia Espinosa, Kulakowski Marlova Piva, Brehm Feliciane Andrade, Moraes Carlos Alberto Mendes, Ferreira Victor Miguel, Mesquita Esequiel Fernandes Teixeira, de Azevedo Afonso Rangel Garcez, Monteiro Sergio Neves
Civil Engineering Graduate Program, Vale do Rio dos Sinos University (UNISINOS), São Leopoldo 93022-750, Brazil.
Mechanical Engineering Graduate Program, Vale do Rio dos Sinos University (UNISINOS), São Leopoldo 93022-750, Brazil.
Materials (Basel). 2022 Mar 22;15(7):2352. doi: 10.3390/ma15072352.
Environmental concerns have come to the forefront due to the substantial role of the cement industry in the extraction and expenditure of natural resources. Additionally, industrial processes generate a considerable amount of waste, which is frequently disposed of inadequately. The objective of this study was to evaluate the simultaneous use of ornamental rock processing sludge and calcium carbonate sludge generated from the kraft process in the production of belitic clinker. These waste materials would be used in total or partial substitution of natural raw materials, namely, limestone and clay. Several formulations were produced and sintered at 1100 and 1200 °C. The raw materials were characterized physico-chemically and thermogravimetrically, with subsequent evaluation of the resulting dosed raw mixes. Mineral analyses determined that the mixtures with limestone and clay in substitution ratios of 95% and 100%, respectively, and sintered at 1100 °C have the potential to produce belite-rich clinkers. This temperature is considerably lower than those reported in reference studies. Additionally, full limestone and clay substitution could result in a 23.92% reduction in carbon dioxide in clinker production. The results confirmed the potential use of ornamental rock processing sludge and calcium carbonate sludge as viable alternative materials for cement production and, consequently, could contribute to a reduction in the negative environmental impacts of this industry.
由于水泥行业在自然资源的开采和消耗中发挥着重要作用，环境问题已成为人们关注的焦点。此外，工业生产过程会产生大量废弃物，且这些废弃物的处理方式往往不尽人意。本研究的目的是评估在贝利特熟料生产中同时使用观赏石加工污泥和硫酸盐法制浆过程中产生的碳酸钙污泥的可行性。这些废料将全部或部分替代天然原料，即石灰石和粘土。制备了几种配方，并在1100℃和1200℃下进行烧结。对原料进行了物理化学和热重分析表征，并随后对所得的配料生料混合物进行了评估。矿物分析表明，分别以95%和100%的替代率替代石灰石和粘土并在1100℃下烧结的混合物有生产富含贝利特熟料的潜力。该温度远低于参考文献研究中报道的温度。此外，完全替代石灰石和粘土可使熟料生产中的二氧化碳排放量减少23.92%。结果证实了观赏石加工污泥和碳酸钙污泥作为水泥生产可行替代材料的潜在用途，因此有助于减少该行业对环境的负面影响。
