Sıvı Oranlarında Uleksitin Fosforik Asit Çözeltisinde Çözünme Kinetiği The Dissolution Of Ulexite İn Phosphoric Acid Solutions For High Solid-To-Liquid Ratios

Abstract

ÖZETY K E K T /I I R N A I D U E ST NF S O İ A İÜ S K A I V O A L R N A L K İ İ O F R K STSÇ Z L İİ D Ç Z NÖ E T SN E Ö Ü MEK N T ĞİE İ İÇALIMLI, Mehmet HarbiY ke Lsn T z Km a nb i D lüsk i s ei i y A aim aa , l ıT z aı aıD çD . h eT Ne D n m n o. rMem t U Çş:Ş bt20,4ua 064 Sayfa:T ri ,dnaı e zni brcve e ne sahip olan bir ülkedir.ük e üyn n eg o ehr ry n n liÜkm z o cve e ,atibr ld çk y b drm aı B r iş l i el ibr ehr r klet a y a o i i uu dd . o b ei e ve l i i i ıa ir r l krbr i r l i üü üü e i i ei knl ı r ı aı B nnndn bro m n ae gnm zn n l çk i ou ra s dd . uu eei oe lr g c a an r ,b ei e n kln a n r ı gn gçkea m s dn kyal m k d .iş l i n u aı l l ı n ü et ç r aı a ank n at ıl k ri l m a an i tn a arUes,T ri 'e K t y-E e v B l eil i ük ekt y d ü ha m t e aks-Bigadiç yöresindeki ocaklardana ırç a l at ı Ues cve n yke kts ı oal ı a fs r aiı rm k d . l i ehr i üsk a/v r a nkı ar kt in ıı n r d of i sok tçzls dkçzn e i t i uüe aa i e n e iiöeineiöüm k eğbgn kdrn l m m şrti ni ce t.B çlm d u kin yke kts ı oal ı a fs r aiu aş aa l si üsk a/v r a nı et ıı n r d of i sok tçzls d çzn e i t ine niÇ lm d t e ou i kts ı r ı nöeine öüm k eğ i l d aş aaa byt l a/v oa nti ni ce . ı n u e ıı nıkçl ei e eki n ı k ğ ı a m s lçzn e ı a t 0 M'a 1 aüü sv r s o s al ı n r aı a öüm h ırı , dn M'm a y c ın t y z t. 1kdr r n s knat sol ı a öüm h ırı e M'a sna r n saa a a ai osn ayn r d çzn e ı a tv 1 dn or a a ait t r an zt t tknat sol ı ai çzn eh ı zl . a şr ah ı ni çzn eh ıosn ayn r d s öüm ı aa ıK rtm ın s öüm ır an e z d ıı zı e züe n f l e i o aı bl d. l s,ofr aiçzls d çznüüzr e a a t l l d ı u nu Ue i fs i s öeine öüdği z ki m ğ u kt ok t tizm nm yaa e n eki n şğ ai i yzaira a, edn gl r s o aaı kg iaıb ie ay d b l l:ï ® 2Na++ 2Ca2+(aq) + 6H2PO-Na2O.2CaO.5B2O3.16H2O(k) + 6H3PO4(aq) (aq)4(aq) + 10H3BO3(aq) + 4H2O(s)A r a pr e e r dğr nil ei e çzn e o y ı klyı , a m t l i ee ed i s l öümc a ren l rm y l ın üanfm ne d üyn ot l o uu e eki n ın ,i i n i zo kn o ü l ğ v r s o h ı nld f rl d ay zı[ 1-3(1-X)2/3 + 2 (1-X) ] =ktşk nei im dll gs reicğ t p ei iB r atüeixdnşmel dk b oe i öt ib eeie i d d ua sr , öüüi r e el l s t l. d yksnv k a eki n ısb i gs r et ier ie d r s o h ain öt m k d .i ay z ti e erAnahtar Kelimeler: B rÇ zn e i t i F s r ai Uleksit.o, öüm k eğ of i s,n i, ok tiABSTRACTT ED S O U I NO U E İ EI P O P O I A I S L T O SH IS L T O F L XT N H S H RC CD O U I NFOR HIGH SOLID -TO-LIQUID RATIOSÇALIMLI, Mehmet HarbiMaster Thesis, Chemistry Mainsciense BranchSupervisor: Assoc. Doç. Dr. Mehmet TUNÇFebruary:2006, 44 pagesTurkey is a country which possesses the richest boron mineral. Thecnio o T re? brn m nsi vr go i t m o qat B rnod i f ukys oo itn e s e od n e s f uly ooy r i.compounds and boron minerals are in between the most concerning the subjects bynow. This reason have been sourced tue to increased that used areas of boroncompounds as passed day. Ulexite is obtained from boron mines located in Kütahya-E e adB l eim t n aks-Bigadiç in Turkey. The kinetics of dissolution of ulexite are inırphosphoric acid solutions have not been investigated so far.In this study, the kinetics of dissolution of ulexite in phosphoric acidsolutions for high solid-to-liquid ratios were investigated. Dissolution rate increasedwith decreasing particle size and solid-liquid ratio and with increasingto-temperature. The dissolution rate increased from 0.1 M up to an acid concentrationof 1 M and then decreased with increasing acid concentration, but stirring speed hadno more effect on it. When ulexite dissolved in phosphoric acid solutions, occuringreaction can be written as followingï ® 2Na++ 2Ca2+(aq) + 6H2PO-Na2O.2CaO.5B2O3.16H2O(s) + 6H3PO4(aq) (aq)4(aq) + 10H3BO3(aq) + 4H2O(l)In addition, the investigation of parameters showed that the dissolutionphenomenon was controlled by ash layer diffusion process and reaction rate can begiven as below[ 1-3(1-X)2/3 + 2 (1-X) ] =ktWhere t time, x conversion fraction and k is the rate constant.Key words: Boron, Dissolution kinetics, Phosphoric acid,Ulexite.i