Abstract
Herein, a novel method for energy recovery from molten synthetic slags is analyzed. In this work, the potential energy that could be recovered from the production of synthetic slag is estimated by means of an integrated experimental–theoretical study. The energy to be recovered comes from the cooling–solidification stage of the synthetic slag manufacturing. Traditionally, the solidification stage has been carried out through quick cooling with water, which does not allow the energy recovery. In this paper, a novel cooling method based on metal spheres is presented, which allows the energy recovery from the molten slags. Two points present novelty in this work: (1) the method for measuring the metal spheres temperature (2) and the estimation of the energy that could be recovered from these systems in slag manufacturing. The results forecasted that the temperature achieved by the metal spheres was in the range of 295–410 °C in the center and 302–482 °C on the surface. Furthermore, we estimated that 325–550 kJ/kg of molten material could be recovered, of which 15% of the energy consumption is in the synthetic slag manufacturing process. Overall, the results obtained confirmed the potential of our proposal for energy recovery from the cooling–solidification stage of synthetic slag manufacturing.
Highlights
IntroductionThe future challenges related to the known circular economy policy need to intensify the research of more environmental processes and less energy-intensive industrial processes [1,2]
Even though the idea of valorizing waste as constituents of cements is documented in the literature through patents and research works [5,6,7,8,9,10], novelties can be studied in different ways such as (1) exploring new materials and seeking similar properties to those presented by blast furnace slags; (2) the obtaining of synthetic slags exclusively from waste mixtures that could be managed in non-hazardous waste landfills; and (3) the energy-efficient production of synthetic slag manufacturing
This paper studies the potential energy recovery of the cooling process of synthetic the slags production production by means of a mass cooling system with metal spheres
Summary
The future challenges related to the known circular economy policy need to intensify the research of more environmental processes and less energy-intensive industrial processes [1,2]. In this sense, one of the key points is the development of new product manufacturing through the recovery of waste/by-products in applications with high added value and easy technology transfer to the industrial sector [3,4]. Even though the idea of valorizing waste as constituents of cements is documented in the literature through patents and research works [5,6,7,8,9,10], novelties can be studied in different ways such as (1) exploring new materials and seeking similar properties to those presented by blast furnace slags; (2) the obtaining of synthetic slags exclusively from waste mixtures that could be managed in non-hazardous waste landfills; and (3) the energy-efficient production of synthetic slag manufacturing.
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