Wyniki wyszukiwania - Biblioteka Nauki

1

Alkali roasting of bomar ilmenite: rare earths recovery and physico-chemical changes

100%

Sanchez-Segado S. , Lahiri A. , Jha A.

Open Chemistry

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2015

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tom 13

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nr 1

EN

In this work, the alkali roasting of ilmenite (FeTiO3) is presented as a process route for integrated beneficiation of the mineral for rutile-rich phase and rare earth oxides; the latter is released as a consequence of physical changes in the ilmenite matrix, during the water leaching after roasting. The oxidative alkali roasting transforms ilmenite mineral into water-insoluble alkali titanate and water-soluble ferrite. After roasting the insoluble alkali titanate is separated from rare-earth oxide mixture in colloidal form and water-soluble ferrite. Further leaching of alkali titanate is carried out with oxalic (0.3M) and ascorbic (0.01M) acid solution which removes the remaining Fe2+ ions into the leachate and allows precipitation of high-purity synthetic rutile containing more than 95% TiO2. Iron is removed as iron oxalate. The physico-chemical changes occurred during the roasting and leaching processes are reported by comparing the role of alkali on the roasting process and product morphologies formed.

2

Gas Atomization Parametric Study on the VIGA-CC Based Synthesis of Titanium Powder

100%

Kim D.-K. , Kim Y. I. , Lee H. , Kim Y. D. , Lee D. , Lee B. , Kim T.-S. , Kim D.-K. , Kim Y. I. , Lee H. , Kim Y. D. , Lee D. , Lee B. , Kim T.-S.

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tom 65

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nr 3

3

Analytical performance of a fast multi-element method for titanium and trace elements determination in cosmetics and pharmaceuticals by ICP-AES

100%

Zachariadis G. , Sahanidou E.

Open Chemistry

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2011

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tom 9

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nr 2

213-217

EN

A multi-element analytical method based on inductively coupled plasma atomic emission spectrometry (ICP-AES) was developed for trace elements in pharmaceutical tablets and cosmetics. Titanium was also included in the analytes since it is widely used in pharmaceuticals. Critical ICP conditions, like RF incident power, argon gas flow rate and nebulizer sample uptake flow rate were optimized. The most sensitive spectral line of each analyte was selected as optimum for further study. Detection limits in the low µg g−1 range were obtained. Prior to chemical analysis, the samples were decomposed by acid digestion, using various mixtures of HCl, HNO3 and HF. Yttrium was used as a suitable internal standard in order to correct for possible matrix effects. The method was applied to the analysis of six different pharmaceutical products (anti-biotic, anti-inflammatory, anti-hypertensive) in the form of tablets with film coating and also three cosmetic products like hair and face masks.

4

The Ti-Fe-P system: phase equilibria and crystal structure of phases

100%

Toma O. , Dzevenko M. , Oliynyk A. , Lomnytska Y.

Open Chemistry

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2013

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tom 11

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nr 9

1518-1526

EN

Abstract Phase equilibria was investigated in the Ti-Fe-P system at T = 1070 K in the region 0–67 at.% of P, employing X-ray powder diffraction. The two ternary compounds, namely Ti0.5–0.8Fe1.5−1.2P (Co2Si-type; space group Pnma; a = 0.5964(2)–0.6011(3), b = 0.3575(3)–0.3600(1), c = 0.6828(2)–0.6882(2) nm) and Ti0.85−1.25Fe1.15−0.75P (ZrNiAl-type; space group P-62m; a = 0.6071(4)–0.6117(1), c = 0.3510(9)–0.3506(1) nm) exist in the Ti-Fe-P system at this temperature. The crystal structure of the Ti0.85–1.25Fe1.15−0.75P compound was additionally determined by X-ray single crystal diffraction on the phase with stoichiometric composition. The substitutions of Ti by Fe were observed for Ti5P3.16, Ti3P and TiP phases, and Fe for Ti in the case of Fe3P, Fe2P binary compounds. Graphical abstract [...]

5

The Effect of Addition of Titanium on The Structure and Properties of High Chromium Cast Iron

86%

Kopyciński D. , Guzik E. , Siekaniec D. , Szczęsny A.

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nr 3

6

Effect of Ti on Selected Properties of AlSi7Mg0.3Cu0.5 Alloy with Constant Addition of Zr

86%

Bolibruchová D. , Kuriš M. , Matejka M. , Major-Gabryś K. , Vicen M. , Bolibruchová D. , Kuriš M. , Matejka M. , Major-Gabryś K. , Vicen M.

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nr 1

7

Effect of Titanium Inoculation on Tribological Properties of High Chromium Cast Iron

86%

Siekaniec D. , Kopyciński D. , Szczęsny A. , Guzik E. , Tyrała E. , Nowak A.

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nr 4

8

Role of Titanium in Thin Wall Vermicular Graphite Iron Castings Production

86%

Górny M. , Kawalec M.

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9

Influence of Titanium on Crystallization and Wear Resistance of High Chromium Cast Iron

86%

Studnicki A. , Kondracki M. , Dojka R. , Gromczyk M.

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10

The Impact of Selected Geometry Parameter of Titanium Spatial Insert on the Surface Layer Formation on Grey Cast Iron

72%

Dziwoki G. , Dulska A. , Szajnar J. , Król M.

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tom iss. 1

58--62

EN

The paper presents a method of producing a grey cast iron casting locally reinforced with a titanium insert printed using SLM method (Selective Laser Melting). This article attempts to examine the impact of the selected geometry of titanium spatial insert on the surface layer formation on grey cast iron. The scope of the research focuses on metallographic examination - observation and analysis of the structure of the reinforced surface layer on a light and scanning microscope and a hardness measurement of the titanium layer area. Based on the obtained results, it was concluded that the reaction between titanium insert and metal (grey cast iron) locally develops numerous carbides precipitation (mainly TiC particles), which increases the hardness of the reinforced surface layer and local strengthening of the material. The ratio between the thickness of the support part (grey cast iron) and the working part (titanium insert) affects the resulting layers connection structure. The properties of the obtained reinforced surface layer depend mainly on the geometry of the insert (primarily on the internal dimensions of the connector) and the volume of the casting affecting the re-melting of the insert. A more concentrated structure of carbides precipitation occurs in castings with a full connector insert.