2024-09-19 –, Europe Hall
Currently, the main purpose for obtaining alternative binders for use in taphole clay is to reduce the exposure to harmful polycyclic aromatic hydrocarbons (PAH) associated with conventional coal tar (CTht) binders. Some advances have been made such as using lower-PAH alternative binder or phenolic resole resin (resin-bonded) in taphole clays. The use of non-toxic binders has become exceedingly difficult due to the versatility of CTht in taphole clay. This study investigated a combination binder system that consisted of a sugar alcohol (research-grade glycerine) and phenolic resole resin as a potential non-toxic binder for use in platinum smelting taphole clay. The binder system was characterized according to its composition through Fourier-transform infrared spectroscopy and the PAH content (16-EPA-PAH) was determine using targeted gas chromatography mass spectroscopy. Flow behaviour of the binder was determined through rotational rheology, and the volatilization and rheological thermal stability of the binders were assessed through thermogravimetric analysis and thermorheology, respectively. The effect of mixing these binder constituents on the cross-linking behaviour of the phenolic resin was evaluated using differential scanning calorimetry. The combination binder had a higher average mass loss and lower carbon yield compared to conventional CTht, but with a lower total PAH content, making it a more health-friendly alternative.
Izak Cameron is a research and development scientist at Elkem Silicon Products specializing in the use of microsilica and other constituents in refractory materials. He attained his PhD at the University of Pretoria specializing in taphole clay materials, specifically replacing pitch as a binder under supervision of Prof. Andrie Garbers-Craig. He held several positions within refractories one of which includes refractory development engineer at Vesuvius South Africa for 4 years where he was responsible for product development in AlSi, basic monolithics and taphole clay materials.