Chemical durability of sintered glass-composite prepared from glass cullet and waste foundry sand

Abstract

In this study, the glass-composite was prepared using glass cullet and waste foundry sand as raw materials. The powder technology route was employed. The mixtures containing 10-50 wt% of the sand were sintered at T = 750 °C for t =1h. XRD and DTA analyses were performed. The chemical durability of the resulting glass-composite was determined by leaching test in HCl, H2SO4, NaOH and distilled water at T = 95 °C for t =1h. It was shown that the sintering process carried out without the crystallization of the glass matrix. The lowest chemical durability was determined in alkali solution of glass-composite.

YUCOMAT 2023: An International Advisory Board Member’s Digest

“…As a path toward the solution, having studied the mechanistic aspects of the process, Solodkyi's group used high-speed densification in the liquid phase, where the sintering time of porous compacts to full density did not exceed 150 s, with no coarsening observed in the process. Next, Veljko Savić from the Institute for Technology of Nuclear and Other Mineral Raw Materials in Belgrade described the process of formation of sintered glass foams using glass from landfills and sugar beet factory lime as the foaming agent, praising the material for its high insulation capacity, low specific weight, durability, and potential to promote sustainable development [87].…”

Reuse or Disposal of Waste Foundry Sand: An Insight into Environmental Aspects

“…Table 1 shows the chemical composition of virgin foundry sands (VFS) usually adopted in the foundries. To limit the amount of WFS landfilled, numerous studies have been conducted in recent years to evaluate its reuse as a secondary raw material in various sectors: cement factories [8,9]; concrete [2,[5][6][7]; ceramic [16][17][18][19]; and glass industries [20,21]. To evaluate the correspondence with the characteristics required in the various areas, the WFS are subjected to chemical analyses and leaching tests to verify the release of substances that could create risks for human health and the environment.…”

“…The main options for WFS reuse are the replacement of fine aggregate in concrete [2,[5][6][7], cement factories [8,9], brick furnaces [10][11][12], embankments [13,14] or structural fills [14,15]; some studies guarantee their suitability for the ceramic [16][17][18][19] and glass sectors [20,21] but to date there are no full-scale applications. The unbound applications of WFS that do not involve their immobilization in a matrix are widely used worldwide; this type of use requires greater attention, as WFS, in contact with rainwater, can release contaminants that can affect the conditions of surface and groundwater, increasing risks for human health and the environment.…”