Recovery of Silver from X-Ray Film Processing Effluents Using Trimercapto-s-triazine (TMT)

YAZICI E. Y., DEVECİ H., Yazici R.

SEPARATION SCIENCE AND TECHNOLOGY, vol.46, no.14, pp.2231-2238, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 14
  • Publication Date: 2011
  • Doi Number: 10.1080/01496395.2011.595032
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2231-2238
  • Keywords: precipitation, recovery, silver, Taguchi, Trimercapto-s-triazine (TMT), waste treatment, 2,4,6-TRIMERCAPTO-1,3,5-TRIAZINE TMT, COMPLEXES
  • Karadeniz Technical University Affiliated: Yes


In this study, the recovery of silver from waste X-ray photographic solutions by precipitation using trimercapto-s-triazine (TMT) was studied. Taguchi L-25 (5(3)) orthogonal design was adopted for the study. The effects of concentration of thiosulphate (5.2-200 g/L), TMT (Ag:TMT = 6.6-2.2), temperature (20-60 degrees C) and pH (4.37-8.00) on the extent of the precipitation of silver were investigated. The findings have shown that the concentration of TMT and pH are the most significant factors affecting the recovery of silver while the effect of temperature (20-60 degrees C) is insignificant under the conditions tested. The increase in the concentration of TMT and pH was found to improve the extent of precipitation of silver. TMT was also found to be an effective agent to reduce silver concentrations below the regulatory limit value of 5 ppm. Characterization of the precipitates was performed to identify silver-TMT compounds formed.