Dissolution kinetics of ulexite in ammonia solutions saturated with CO2
Küçük Resim Yok
Tarih
1997
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The dissolution kinetics of ulexite in ammonia solutions saturated with carbon dioxide were investigated, Experiments investigating the following parameters: concentration of ammonia; particle size; stirring speed; solid to liquid ratio; reaction temperature; and carbon dioxide flow rate; showed that ulexite can be dissolved completely in solutions of carbonic acid at atmospheric conditions, It was found that the dissolution rate increased with increasing ammonia concentration, reaction temperature and calcination temperature, and with decreasing particle size and solid to liquid ratio, It was observed that the flow rate of carbon dioxide and stirring speed have almost no effect on the dissolution rate, It was determined that the dissolution rate of ulexite can be described by a first-order pseudo-homogeneous reaction model and an empirical equation for the process was developed: -ln(1-X) = 1.0X10(5)(C-A)(0.22)(d)(-0.92)(S/L)(-0.54)exp(-6600/T). t where C-A is the ammonia concentration, d the initial particle size and (S/L) the solid to liquid ratio. The activation energy for the process was found to be approximately 55 kJ mol(-1)
Açıklama
Anahtar Kelimeler
Water
Kaynak
Hydrometallurgy
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
44
Sayı
1-2
