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| 1 | Innovative pre-concentration technology for recovering ultrafine ilmenite using superconducting high gradient magnetic separator显示文摘To achieve the utilization of the abandoned ultrafine ilmenite(-20 μm) produced in the titanium magnetite processing plant in Panzhihua,the superconducting high-gradient magnetic separation(SMS) technology was proposed in this study.After optimizing the conditions of magnetic intensity,feeding and pulsation,an SMS concentrate with TiO_(2) grade of 16.03% and TiO_(2) recovery of 66.39% was obtained through one roughing-one cleaning pre-concentration flowsheet.The specific magnetic force and magnetic force were calculated and analysed to illustrate the pre-concentration mechanism,and the results revealed that the combination of high magnetic field and strong pulsating resulted in the effective preconcentration of the ultrafine ilmenite in the SMS process.In addition,the magnetic force analysis indicated that the high magnetic intensity and high magnetic gradient are the key factors of the SMS technology.Furthermore,the EDS-Mapping detection certified that the ultrafine ilmenite was concentrated from the gangue minerals using SMS technology. | Zhitao Yuan Xuan Zhao Jiwei Lu Hong Lv Lixia Li | 2021 | International Journal of Mining Science and Technology2021，31，6： | 3 |
| 2 | 分级介孔SiO_(2)空心微球氨基修饰及木瓜蛋白酶固定化显示文摘为了提高SiO_(2)载体材料的酶固定化性能,分别采用接枝法和原位法对自制的分级介孔SiO_(2)空心微球进行氨基修饰,并考察其木瓜蛋白酶固定化性能。与未修饰的样品相比,接枝法修饰后微球一级最可几孔径(8.68~8.70 nm)减小,二级最可几孔径(29.30~29.89 nm)无明显变化,表明氨基主要修饰在一级孔道中。原位法修饰后样品的一级最可几孔径(4.47~7.34 nm)、二级最可几孔径(14.49~19.78 nm)均有明显减小,表明一、二级孔道中均有氨基修饰。与未修饰和接枝法修饰的样品相比,原位法修饰后样品的最大木瓜蛋白酶固定量为750 mg×g^(-1),相对酶活力为121.0%,均高于未修饰和接枝法修饰的样品。原位法氨基修饰在提高SiO_(2)载体材料的酶固定化性能方面更具优势。 | 李群艳 孙路瑶 韩寿德 伏璇 | 2022 | 高校化学工程学报2022，36，5： | 0 |
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