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A two-step zircon decomposition method to produce zirconium oxychloride:alkali fusion and water leaching

Rare Metals 2020年第4期39卷 448-454页

作者： Jing Song Jing-Fei Fan Jing-Chong Liu Ran Liu Jing-Kui Qu Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy SciencesBeijing 100190China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China

In this work,a two-step zircon method to produce zirconium oxychloride was introduced,and the alkali fusion technique with NaOH and water leaching process were *** effects of the operating conditions on the decomposition of zircon were determined,and the optimal conditions are as follows:alkali/zircon mass ratio of 0.7 at the first step and 0.6 at the second step(0.7+0.6),fusion temperature of 700℃and fusion time of 0.5 h at the first step and 0.5 h at the second step(0.5+0.5 h).Under these conditions,the decomposition alloy of zircon sand can reach 97.25%.In the fusion process of zircon sand,the products of first step are mainly Na2ZrO3 and ZrSiO4,the products of second step are Na2ZrO3 and Na2SiO3,and the diffraction peaks of Na2ZrSiO5 are not *** conditions of water leaching process were investigated as well,and the optimal conditions are as follows:liquid-solid ratio of 5:1,leaching time of 0.5 h,leaching temperature of 50℃and leaching three *** these conditions,the contents of leaching products SiO2 and Na2O are 3.51%(40%ZrO2)and 4.46%(40%ZrO2),*** crystal phase structures of Na2ZrO3 and Na2SiO3 are formed in water leaching process.

关键词： zirconium oxychloride Zircon Two-step alkali fusion Water leaching

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ZrOCl2 Catalysed Chemoselective Conversion of Aldehydes to geminal-Diacetates and Their Cleavage： A Mild and Efficient Method

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Chinese Journal of Chemistry 2007年第10期25卷 1555-1558页

作者： NAGARAJ, Adki SANJEEVA REDDY, Cherkupally Department of Chemistry Kakatiya University Warangal-506 009 India

ZrOCl2 was found to be an effective Lewis acid catalyst for the solventless chemoselective conversion of aldehydes into geminal-diacetates in high yields at room temperature. Regeneration of the aldehydes from the acetals was also achieved using the same catalyst in water. The beneficial effect of microwave irradiation on the reaction was also described. Other advantages are the very low loading of catalyst, high yields achieved even on a gram scale, and considerably shortened reaction time compared to the conventional method.

关键词： zirconium oxychloride acetal chemoselective microwave irradiation

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