Promising scandium content of Tebinbulak titanium-magnetite deposit

We present results of geological-mineralogical-geochemical studies of the Tebinbulak scandium-containing titanium-magnetite deposit in Western Uzbekistan. The levels of scandium content in ores and rocks of the pyroxene-hornblende massif have been analyzed. The potential for the associated extraction of scandium from ores, which can significantly increase the profitability of the industrial development of the deposit, is discussed.

Magnetic Diagram of the High-Pressure Stabilized Multiferroic Perovskites of the BiFe1-yScyO3 Series

Magnetic properties of the high-pressure stabilized perovskite BiFe1-yScyO3 phases (0.1 ≤ y ≤ 0.9) have been studied by means of magnetization measurements and neutron diffraction. The metastable perovskites of this series undergo irreversible polymorphic transformations upon annealing, the phenomenon referred to as conversion polymorphism. It has been found that the solid solutions with y ≥ 0.70 exhibit no long-range magnetic ordering regardless of their polymorph modification, while those with y ≤ 0.60 are all antiferromagnets. Depending on the scandium content, temperature and structural distortions, three types of the antiferromagnetic orderings, involving collinear, canted and cycloidal spin arrangements, have been revealed in the phases obtained via conversion polymorphism and the corresponding magnetic phase diagram has been suggested.

Studi Pemanfataan Limbah Terak Timah 2 Bangka Sebagai Sumber Sekunder Unsur Skandium

Terak timah (tin slag) adalah sisa dari pengolahan timah yang mengandung radioaktif dan cenderung menjadi limbah karena pemanfaatannya yang belum maksimal. Studi ini bertujuan untuk memanfaatkan limbah terak timah sebagai sumber sekunder unsur skandium sehingga pemanfaatannya dapat meminimalkan risiko paparan radioaktif terhadap lingkungan. Skandium banyak digunakan sebagai solid oxide fuel cells (SOFC’s) dapat menyebabkan reaksi terjadi pada temperatur yang lebih rendah, dalam bidang metalurgi sebagai paduan kekuatan tinggi aluminium, dalam bidang keramik penambahan skandium karbida akan meningkatkan kekerasan, lampu metal halida dengan intensitas tinggi, elektronik, dan penelitian laser. Penelitian ini menggunakan sampel terak timah 2 Bangka (TTB). Pada tahap awal TTB dipanaskan sampai suhu 900⁰C, lalu dicelupkan ke dalam air, dikeringkan dan di ayak (terak timah 2 Bangka yang dipanaskan, dicelup ke dalam air dan diayak, disebut TTB-PCA). Studi pertama, TTB-PCA yang dilarutkan ke dalam asam florida (disebut kode sampel F) dan studi kedua, TTB-PCA dilarutkan ke dalam HCl kemudian dilarutkan ke dalam NaOH (disebut kode sampel AB). TTB, TTB-PCA, kode sampel F dan AB dilakukan karakterisasi dengan X-Ray Fluorescence (XRF). Hasil karakterisasi memperlihatkan kadar skandium di dalam TTB sebesar 319 ppm dan kadar skandium tertinggi pada TTB-PCA dengan ukuran butir 200 mesh sebesar 804 ppm. Pada penelitian digunakan software HSC Chemistry 6 sebagai pendukung diskusi termodinamika. Kata Kunci: terak timah Bangka, software hsc chemistry 6, limbah padat, skandium, pelarutan ABSTRACT - Tin slag is the waste of tin processing that contains radioactive and tends to become waste due to its not maximal utilization. This study aims to utilize waste tin slag as a secondary source of scandium element so that its utilization can minimize the risk of radioactive exposure to the environment. Scandium widely used as solid oxide fuel cells (SOFC's) can cause reactions to occur at lower temperatures, in the field of metallurgy as high-strength aluminum alloys, in the field of ceramic addition of scandium carbide will increase hardness, metal halide lamps with high intensity, electronics, and laser research. This research used Bangka tin slag 2 (TTB), the initial stage of TTB was roasted to 900°C, then water quenched, dried and sieved (TTB roasted, water quenched and sieved, called TTB -PCA). The first study, TTB-PCA dissolved into fluoride acid (called code sample F) and a second study, TTB-PCA dissolved into HCl and then dissolved into NaOH (called AB code sample). TTB, TTB-PCA, sample code F and AB are characterized by X-Ray Fluorescence (XRF). The characterization results show scandium content in TTB of 319 ppm and the highest scandium content in TTB-PCA with grain size of 200 mesh of 804 ppm. In the study used HSC Chemistry 6 software as a supporter of thermodynamic discussion.Keywords: bangka tin slag, hsc chemistry 6 software, solid waste, scandium, dissolution

Lab Scale Synthesis of Al-Sc Alloys in NaF-AlF3-Al2O3-Sc2O3 Melt

The liquidus temperature in the [NaF-AlF3(30 mol.%)]-Sc2O3 molten system with the Sc2O3 additions up to 12 wt% was measured by the thermo analysis. The effect of the cathode current density (0, 0.25, 0.50, and 1.0 A∙cm-2), the Sc2O3 content (1, 2, 4, and 8 wt%) in the NaF-AlF3(30 mol.%)-Al2O3-Sc2O3 electrolyte, the rate of the molten aluminum agitation (0, 100 rotates/min), the synthesis duration (30-210 min) on the Sc content in the aluminum alloy at 980 °С was studied. The Al-Sc alloys with the scandium content of 0.15-1.30 wt%, depending on the synthesis conditions, and with the uniform Sc distribution throughout the aluminum matrix were produced.