- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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The present work deals with a study of a new technique for extracting zirconium from Egyptian zircon by its processing with sodium hydroxide solutions in ball-mill autoclaves; where grinding and leaching of zircon are combined together in one process at lower temperature and shorter time.
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Solvent extraction processes are universally used today toremovehafnium from zirconium; such a separation step is shownin Fig. 1, which is a con- ... step in the process is theproduction of zirconium (hafnium) tetrachloride by high temperature gaseous chlorination of either zircon-carbon composites or zirconium carbide …
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High purity zirconium oxy chloride synthesis method has been developed from zircon sand of Chatrapur beach placer deposit of IREL Odisha. Chemical method of purification is found to be suitable means of producing high purity zirconium oxy chloride with very low radioactivity. Complexing agent such as pentetic acid or diethylene …
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Nuclear grade zirconium and hafnium are important materials in nuclear power plants, which are usually produced with solvent extraction and separation technology. In this paper, the preferential extracting hafnium was successfully achieved by the selective complexation of the selected organic acids. Hydrochloric acid …
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The separation processes are roughly classified into hydro- and pyrometallurgical routes. The current dominant zirconium production route involves pyrometallurgical ore cracking, multi-step hydrometallurgical liquid-liquid extraction for hafnium removal and the reduction of zirconium tetrachloride to the pure metal by the Kroll process.
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Technologically Enhanced Natural Radioactive Material (TENORM) contamination is a serious health problem. In applying safe zirconium oxide (ZrO2) in the industrial sector, it is necessary to have environmentally friendly ZrO2, namely very low radioactivity (< 1 Bq/g) and TENORM free. This study aims to obtain a ZrO2 with very …
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The metal retention behaviors of several simulated radiolysis products on zirconium metal were investigated, and it was found that acid phosphate radiolysis product HDEHP has the greatest effect. The effects of extraction nitric acid concentration, simulated radiolysis product concentration, metal concentration, and temperature on the …
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The extraction of zirconium (Zr) and hafnium (Hf) in methyl isobutyl ketone (MIBK)—thiocyanic acid (HSCN) system has been widely used in the production of nuclear-grade zirconium and hafnium in industry, while the extraction mechanism was not adequately studied. In this study, the extraction and stripping equilibrium of Zr and Hf in …
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The present work deals with a study of a new technique for extracting zirconium from Egyptian zircon by its processing with sodium hydroxide solutions in ball-mill autoclaves; where grinding and leaching of zircon are combined together in one process at lower temperature and shorter time. 2.
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The decomposition process for zircon sand concentrate using mixed base of sodium hydroxide partly replaced by calcium oxide was inrestigated. It is found that the decomposition rate of zircon gradually increased with the increase of the reaction temperature and time. ... Abdel-Rehim A.M., A new technique for extracting zirconium …
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the iodide or crystal bar process to produce high-purity zirconium, commercialising the metal soon after in 1930 [2]. Around 97% of zirconium compounds and zirconium metal produced worldwide are obtained from zircon recovered from heavy-minerals sands deposits (known as secondary
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During the water leaching, a certain amount of zirconium is entrained in the silicon slag and discharged. If optimum silicon removal is performed, we can reduce the amount of silicon slag and the corresponding zirconium entrained can be reduced. This process will reduce the production cost and improve the zirconium extraction rate.
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