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- W3016483571 abstract "The use of calcined clays as a substitute for clinker in the cement manufacturing is of great interest among the industries of cement and concrete due to many reasons, such as lower cost of production, lower CO2 emission rate and great availability of clay material. However, there are different kinds of clays available, regarding chemical and mineralogical composition. Processing clays with high iron content results in reddish or pinkish pozzolan, and cements with reddish and pinkish hues are misjudged as low-quality material. A color change technology to produce gray pozzolan from high iron content clays has been developed by Dynamis and proved in both laboratorial and industrial scales. This work presents the advance of this technology, proving that it can be applied to different kinds of clays and also that it can be implemented with the use of a flash dryer and a rotary kiln or considering only the kiln that can be a refurbished equipment. The technology also enables the production of pozzolan without the color change issue but also in an efficient and economically viable way. Using a combustion technology developed for clay activation, it is possible to control the calcination temperature and to obtain a controlled atmosphere, which is the key to the color change process. Industrial-scale tests proved that the technology is viable and versatile, regarding the types of processed clays." @default.
- W3016483571 created "2020-04-24" @default.
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- W3016483571 date "2020-01-01" @default.
- W3016483571 modified "2023-10-17" @default.
- W3016483571 title "A Flexible Technology to Produce Gray Calcined Clays" @default.
- W3016483571 cites W2327104808 @default.
- W3016483571 doi "https://doi.org/10.1007/978-981-15-2806-4_20" @default.
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