Cullet
The assessment of glass cullet quality on the redox state Stefano Ceola*, Nicola Favaro** and Antonio Daneo*** highlight an analytical tool for the control and evaluation of cullet effects on the glass final redox state.
T
his paper describes some common problems in the use of cullet as a secondary raw material for the glass industry. First an overview of the use of cullet at EU level will be presented, along with its advantages and disadvantages. After an overview of the most common issues derived from the use of cullet, special attention is drawn to cullet contributions to possible instabilities in the final redox ratio of the produced
glass. A new analytical methodology is described, the Inorganic Redox (I-Redox), to check the quality and stability of the produced cullet. The determination of the redox ratio is described theoretically and experimentally as it is usually performed in glass industry as a quality check tool, then the I-Redox is described and discussed as a new tool for the determination of the redox contribution
Scope One of the main parameters of study and concern in the glass industry is the redox state of the glass. It drives the sulphur/sulphate solubility and the colour of the glass[1], and its stability is of key importance in the frame of quality control of the produced glass. Continued>>
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ďż˝ Fig 1. Collection rates for container glass recycling in Europe 2014.
of cullet in the batch and as a parameter for monitoring cullet redox variability.
41 Glass International December/January 2018
Cullet SsV.indd 1
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