Leaching of rare earths Y, La and Ce by sulphuric acid from fine-grained zirconosilicate ore was investigated using Ta-guchi method of experimental design. An orthogonal array of L8, 27 which denotes 7 factors at 2 le...Leaching of rare earths Y, La and Ce by sulphuric acid from fine-grained zirconosilicate ore was investigated using Ta-guchi method of experimental design. An orthogonal array of L8, 27 which denotes 7 factors at 2 levels was chosen to consider the various factors relevant to the leaching process： baking time, baking temperature, acid dosage, leaching time, leaching temperature, grind size and dilution. Statistical analysis showed that sulphation baking was a significant step for the leaching of rare earths from the whole-of-ore and optimized leaching of rare earths involved the following condition： baking for 3 h at 320 ℃ at 3.2 g acid/g ore acid dosage followed by water leaching at 20 ℃ for 1 h and dilution of 20 mL water/g ore using 300 um grind size. The effect of each leaching factor was also discussed.展开更多
利用水热合成法制备了一种新型硅酸锡微孔化合物(Microporous stannosilicates),通过XRD,SEM,29Si MAS NMR,119Sn MAS NMR,IR和TG等测试手段对该硅酸锡微孔化合物进行了表征.结果表明,该硅酸锡微孔化合物中的Sn物种为六配位形式,而此化...利用水热合成法制备了一种新型硅酸锡微孔化合物(Microporous stannosilicates),通过XRD,SEM,29Si MAS NMR,119Sn MAS NMR,IR和TG等测试手段对该硅酸锡微孔化合物进行了表征.结果表明,该硅酸锡微孔化合物中的Sn物种为六配位形式,而此化合物与硅锆矿石(Litvinskite)具有相同的拓扑结构.展开更多
文摘Leaching of rare earths Y, La and Ce by sulphuric acid from fine-grained zirconosilicate ore was investigated using Ta-guchi method of experimental design. An orthogonal array of L8, 27 which denotes 7 factors at 2 levels was chosen to consider the various factors relevant to the leaching process： baking time, baking temperature, acid dosage, leaching time, leaching temperature, grind size and dilution. Statistical analysis showed that sulphation baking was a significant step for the leaching of rare earths from the whole-of-ore and optimized leaching of rare earths involved the following condition： baking for 3 h at 320 ℃ at 3.2 g acid/g ore acid dosage followed by water leaching at 20 ℃ for 1 h and dilution of 20 mL water/g ore using 300 um grind size. The effect of each leaching factor was also discussed.
文摘利用水热合成法制备了一种新型硅酸锡微孔化合物(Microporous stannosilicates),通过XRD,SEM,29Si MAS NMR,119Sn MAS NMR,IR和TG等测试手段对该硅酸锡微孔化合物进行了表征.结果表明,该硅酸锡微孔化合物中的Sn物种为六配位形式,而此化合物与硅锆矿石(Litvinskite)具有相同的拓扑结构.
