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New vitreous matrix for chromium waste immobilization

Abstract

Common waste glasses (window, bottle glass or tableware) with fly ash form a glass matrix for chromium waste immobilization. Soluble chromium from residual waters was adsorbed on fly ash; the resulting solid contained 23.7% Cr6+. The three glass wastes, chromium-containing fly ash, and borax were used to make glasses in weight ratios waste glass: borax: fly ash of 1: 1: 1 and 1.5: 0.5: 1. The hydrolytic stability ranged from 18.46 to 28.13 µg g−1 soluble Na2O, qualifying them in the HGB1 class. The chemical stability, characterized by the dissolution rate, was 0.011–0.077 µg cm−2 h−1, depending on the glass composition and the aggressive medium pH. The chromium leachability is influnced by the glass composition and the pH of the leaching solution, ranging between 0–0.015% of the total chromium. Chromium waste vitrification is a viabile solution with multiple economic advantages.

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Correspondence to Cosmin Vancea.

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Lazău, I., Vancea, C. New vitreous matrix for chromium waste immobilization. cent.eur.j.chem. 12, 763–768 (2014). https://doi.org/10.2478/s11532-014-0509-3

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  • DOI: https://doi.org/10.2478/s11532-014-0509-3

Keywords

  • Glass wastes
  • Fly ash
  • Chromium wastes
  • Chromium immobilization
  • Bottle glass