Selektivna separacija magnezija iz dolomita in analiza z ICP-OES

Čarman, Tal (author), Kolar, Mitja (mentor)

Magnezij (Mg) in njegove spojine so zelo pomembni na mnogih področjih. Eden najbolj razširjenih in najprimernejših virov Mg je dolomit. Iz dolomita je Mg mogoče pridobiti z uporabo selektivnega raztapljanja in selektivnega obarjanja, kar je tudi glavna tema diplomske naloge. Dvema vzorcema slovenskega dolomita sem določil sestavo z mikrovalovnim razklopom in analizo z ICP OES. Na enem od vzorcev sem preverjal vpliv deleža ekvivalenta in volumna reagenta pri selektivnem raztapljanju z žveplovo (VI), oksalno in vinsko kislino ter selektivnem obarjanju z natrijevim hidroksidom. Uspešnost postopka sem ovrednotil z izkoristkom raztapljanja Mg in molskim razmerjem Mg/Ca. Optimalne postopke sem preizkusil še na drugem vzorcu. Oba vzorca sta bila zelo blizu idealnemu dolomitu. Optimalni postopki so bili zelo učinkoviti in selektivni za Mg. Najboljši postopek je za prvi vzorec dosegel 98,3 % izkoristek za Mg in molsko razmerje Mg/Ca = 155, za drugi vzorec pa 66,1 % izkoristek za Mg in Mg/Ca = 327.

• Language: Slovenian
• Keywords: magnezij, dolomit, selektivno raztapljanje, selektivno obarjanje, ICP-OES
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2025
• PID: 20.500.12556/RUL-171858
• COBISS.SI-ID: 252719107
• Publication date in RUL: 03.09.2025

Secondary language

• Language: English
• Title: Selective separation of magnesium from dolomite and analysis by ICP-OES

Abstract

Magnesium (Mg) and its compounds are vital in many areas. One of the best and most common sources of Mg is dolomite. The main topic of this work is the separation of Mg from dolomite, which can be achieved by selective leaching and selective precipitation. The elemental composition of two samples of Slovenian dolomite was determined by microwave digestion and analysis by ICP OES. The effect of reagent equivalent and volume on leaching with sulfuric (VI), oxalic and tartaric acid and precipitation with sodium hydroxide was determined on one of the samples. The effectiveness of the processes was evaluated by calculating the Mg yield and the molar ratio Mg/Ca. Optimal procedures were then tested on the second sample. Both samples were very close to ideal dolomite. The optimal methods demonstrated high yield and selectivity for Mg. The best procedure achieved a yield of 98.3 % for Mg and a molar ratio (Mg/Ca) of 155 for the first sample, but was less effective for the second sample with a Mg yield of 66.1 % and a Mg/Ca ratio of 327.

• Keywords: magnesium, dolomite, selective leaching, selective precipitation, ICP-OES