Recovery of Silver from Waste Radiographic Films by Chemical Leaching
Küçük Resim Yok
Tarih
2011
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ASIAN JOURNAL OF CHEMISTRY
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The major sources to recover silver are photo-processing solutions, spent rinse water, scrap film and scrap printing paper. As much as 80 % of the total silver processed for black and white positives and almost 100 % of the silver processed in colour work will end up in the fixer solution. The waste radiographic films used in the experiments were taken from Cukurova University, Balcali Hospital, Adana, Turkey and cut into small pieces. The film pieces (1-9 g) were boiled with 100 mL of various quantities of oxalic acid, nitric acid and sodium hydroxide solutions for about 2.5, 5.0, 7.5 and 10 min at boiling temperature (congruent to 97 degrees C). The aim of the study is to recover silver from waste radiographic films by HNO(3) leaching. To optimize the results of the experimental work, variance analysis was used. The statistical tests (F-tests) showed that nitric acid gave the best results compared with the other agents. Under optimum leaching conditions (radiographic films quantity, 50 g/L; nitric acid concentration, 30 g/L; stirring speed, 180 rpm; leaching time, 15 min) 89 % silver recovery was obtained.
Açıklama
Anahtar Kelimeler
Waste radiographic films, Silver recovery, Acid leaching, Variance analysis, F-Test
Kaynak
ASIAN JOURNAL OF CHEMISTRY
WoS Q Değeri
Q4
Scopus Q Değeri
Q4
Cilt
23
Sayı
1
