Synthetic Slag Production Method Based on a Solid Waste Mix Vitrification for the Manufacturing of Slag-Cement

Abstract

Herein an innovative process to develop a potential vitreous material with cementing properties is proposed. This process paves a production path through melting industrial waste and subsequently cooling the casting in water. The idea erases the need to reduce the environmental impact of the cement industry in terms of natural resources consumption as well as the re-utilization of abandoned wastes from other industries. The recycled industrial wastes were selected according to the amount of waste produced in the industrial field and its suitable chemical composition, such as construction and demolition waste and/or shells from shellfish. As a main result, the mechanical properties showed by our novel material were worse than those reported by blast furnace slag (25–28 MPa for two different proportions) for seven days and better (43–52 MPa for two different proportions) for 28 days. The rest of the properties evaluated were in agreement with the standards’ requirements. Hence, this novel process would help to minimize the environmental impact of these wastes at the same time that their use in the cement industry would reduce the consumption of raw materials.

Novel Study for Energy Recovery from the Cooling–Solidification Stage of Synthetic Slag Manufacturing: Estimation of the Potential Energy Recovery

“…Based on the novel concept of developing synthetic slags from waste, as explained in our previous work [11], the main objective of this study is to evaluate the properties of synthetic slags and the energy recovery capacity of the aforementioned cooling system described in Figure 1. Likewise, the energy recovered in the cooling air stream was estimated in relation to the energy possessed by the molten material in order to analyze the possible energy savings that would result in the manufacture of slags.…”

“…The typical composition of blast furnace slag can be seen in Table 1. In this process, a mix of waste was proposed to obtain the synthetic slag material [11]. As announced in previous work, a deep energy recovery study is needed to estimate the viability of this novel production method.…”

Is Recycling Always the Best Option? Environmental Assessment of Recycling of Seashell as Aggregates in Noise Barriers

“…In light of this fact, many potential solutions have been studied, highlighting among them the use of waste instead of natural resources. The concrete industry, for instance, allows the use of large quantities of waste as a substitute for a conventional raw material, without sacrificing the technical properties of the product [4,5]. From a circular economy point of view, the benefit of this proposal is two-fold: The decrease of natural resource consumption [6,7], and the reduction of air, soil, and groundwater pollution associated with landfilling [8], which can negatively affect human health, environment, and biota [9,10].…”

Metallurgical Wastes Employed as Catalysts and Photocatalysts for Water Treatment: A Review

“…The term includes the noncombustible fraction remaining from waste incineration [1][2][3][4] and solid biofuels [5,6]. Waste materials can also be combined and heat-treated to reproduce the useful properties of blast furnace slag [7] in a synthetic product. While there is a considerable body of literature focusing on management, recycling, and valorization of these products, the present work will limit itself to metallurgical slag which is produced during the extraction and refinement of metals from their ores.…”