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Namen diplomskega dela je optimizacija procesov razkroja in redukcije vzorcev iz proizvodnje pigmentnega titanovega(IV) oksida v zaprtem sistemu. Sledila je potenciometrična določitev vsebnosti titanovega(III) oksida ter železovega(II) oksida v razkrojenih in reduciranih vzorcih. Kot sistem za razkroj in redukcijo smo uporabljali zaprt mikrovalovni razklop. Glavni namen uporabe zaprtega sistema razkroja in redukcije je preprečitev stika s škodljivimi plini. Razkroje in redukcije v mikrovalovni pečici smo izvajali z realnimi vzorci iz proizvodnje. Določili smo pogoje razkroja in redukcije za različne vzorce tako, da so istočasno v mikrovalovni pečici različni vzorci. V mikrovalovni pečici je lahko istočasno do 16 vzorcev. Zaradi tega se skupen čas reakcije za posamezen vzorec podaljša, skrajša pa se skupen čas za razkoj in redukcijo večjega števila vzorcev. Potenciometrična titracija s KMnO4 omogoča sočasno določitev Ti3+ in Fe2+ v istem vzorcu, kar nam omogoča razlika potencialov med Ti3+ in Fe2+ v raztopini. Rezultati vsebnosti TiO2 (g/l) in Fe (g/l) v vzorcih, ki so bili razkrojeni in reducirani v mikrovalovni pečici ter dobljeni z avtomatsko potenciometrično titracijo s KMnO4, so ustrezni, točni in natančni. Z razvito metodologijo lahko uspešno nadomestimo metode, ki se trenutno uporabljajo v Kontroli proizvodnega procesa pigmentnega titanovega(IV) oksida. The purpose of the thesis is the optimisation of the processes of reduction and decomposition of samples from the production of pigmented titanium (IV) oxide in a closed system. Then followed the potentiometric determination of the volume of titanium (III) oxide and iron (II) oxide in reduces and disrupted samples. The closed system for decomposition and reduction in my case was the microwave oven. The main purpose of the use of closed systems for degradation and reduction is to avoid harmful gases. The redactions and decomposition in the microwave oven were carried out with real production samples. We determined the conditions for the decomposition and reduction for different samples, so that different samples are simultaneously in the microwave oven. The microwave oven can take 16 samples at the same time therefore the common reaction time for each samples increases and the common time for the degradation and reduction of a larger number of samples decreases. The potentiometric titration with KMnO4 enables the determination of Ti3+ and Fe2+ in the same sample, which is enabled by the difference of potentials between Ti3+ and Fe2+ in the solution. The results of the content of TiO2 (g/l) and Fe (g/l) samples, which were degraded and reduced in the microwave oven and gained with automatic potentiometric titration with KMnO4, are satisfying. With new methods we can replace the current methods used in the controll of the production process of titanium(IV) oxide. |
