Preparation, Decomposition and Characterizations of Bangka - Indonesia Ilmenite (FeTiO₃) Derived by Hydrothermal Method Using Concentrated NaOH Solution

Abstract:

Ilmenite is an economically important and interesting mineral. It is found as a by-product of tin mining in Bangka Indonesia. This mineral has can be used as the source of making titanium metal, titanium dioxide (TiO2) pigment and material for photo catalysts. However, the synthesis of TiO2 from ilmenite using both sulfate and chloride processes still has faced a major problem to obtain white pigment of high purity and lower operation cost. This is mainly due to Fe2O3 impurity in TiO2 pigment which cannot be easily decomposed. Therefore, this study is aimed at investigating the possibility of using Bangka ilmenite mineral to obtain TiO2 pigments and photocatalysts. For this purpose, , sodium hydroxide (NaOH) was used as decomposition solution via hydrothermal process in a teflon-lined autoclave equipment. The characterization results indicated that Bangka ilmenite contains a significant TiO2 level of more than 30 %, although there still remains some other impurities. Upon decomposition of dissolution using NaOH, was decrease in impurity elements down to 60 %. The decomposition process of ilmenite was optimum at NaOH concentration of 10 M where the ilmenite decomposes to form an intermediate phase of sodium titanate with the morphological shape of fine threads.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 750-756
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.750
• Online since: June 2012
• Authors: Latifa Hanum Lalasari, Florentinus Firdiyono, Akhmad Herman Yuwono, Sri Harjanto, Bambang Suharno
• Keywords: Decomposition, Hydrothermal, Ilmenite, Sodium Hydroxide, Titanium Dioxide (TiO₂)

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