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SUMMARY:Evaluating the use of hydrogel as accelerator for no-cement refrac
 tory shotcreting – a higher performance alternative - Izak Cameron
DTSTART;TZID=Europe/Berlin:20240919T090000
DTEND;TZID=Europe/Berlin:20240919T092000
DTSTAMP:20260809T101023Z
UID:pretalx-icr2024-XCEQXY@pretalx.com
DESCRIPTION:The use of microsilica-gel bonding in no-cement (NCC) shotcret
 ing has gained interest in the last decade with the aim of increasing the 
 lifetime of the refractory material. Consequently\, the accelerators that 
 are conventionally used for low-cement and ultra-low cement shotcreting ar
 e not suitable. Alternatives that are currently being used for NCC shotcre
 ting either have cost implications for installation or maintenance of equi
 pment or performance limitations of the refractory product. This study inv
 estigates the use of different hydrogels as accelerators in NCC shotcretin
 g\, together with a binder system\, SioxX®-Flow\, with the aim of improvi
 ng the shotcrete applying process\, high temperature refractory properties
 \, and limitations associated with current alkali-free accelerators. The e
 valuation consisted of two parts: 1) characterization of the hydrogels thr
 ough rheology measurements\, 2) evaluation of hydrogels in refractory shot
 crete. The characterization of the hydrogel consisted of rheology evaluati
 on of refractory slurry suspension that contained the hydrogel and oscilla
 tory rheology for the pure hydrogels to determine gel strength.  The evalu
 ation of the hydrogel in the refractory shotcrete included non-destructive
  resonance frequency and damping analysis of samples after demoulding\, dr
 ying\, and firing at 1500°C. A preferred hydrogel was proposed based on t
 he requirements for application of refractory shotcrete and results from t
 his evaluation.
LOCATION:K3
URL:https://pretalx.com/icr2024/talk/XCEQXY/
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SUMMARY:Investigating the use of sugar alcohol as an alternative non-toxic
  binder to conventional coal tar/coal tar pitch for use in taphole clay - 
 Izak Cameron
DTSTART;TZID=Europe/Berlin:20240919T100000
DTEND;TZID=Europe/Berlin:20240919T102000
DTSTAMP:20260809T101023Z
UID:pretalx-icr2024-UUYYJB@pretalx.com
DESCRIPTION:Currently\, the main purpose for obtaining alternative binders
  for use in taphole clay is to reduce the exposure to harmful polycyclic a
 romatic hydrocarbons (PAH) associated with conventional coal tar (CTht) bi
 nders. Some advances have been made such as using lower-PAH alternative bi
 nder 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 syst
 em that consisted of a sugar alcohol (research-grade glycerine) and phenol
 ic resole resin as a potential non-toxic binder for use in platinum smelti
 ng taphole clay. The binder system was characterized according to its comp
 osition through Fourier-transform infrared spectroscopy and the PAH conten
 t (16-EPA-PAH) was determine using targeted gas chromatography mass spectr
 oscopy. Flow behaviour of the binder was determined through rotational rhe
 ology\, and the volatilization and rheological thermal stability of the bi
 nders were assessed through thermogravimetric analysis and thermorheology\
 , respectively. The effect of mixing these binder constituents on the cros
 s-linking behaviour of the phenolic resin was evaluated using differential
  scanning calorimetry. The combination binder had a higher average mass lo
 ss and lower carbon yield compared to conventional CTht\, but with a lower
  total PAH content\, making it a more health-friendly alternative.
LOCATION:Europe Hall
URL:https://pretalx.com/icr2024/talk/UUYYJB/
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