The technological mineralogy of the potash feldspar was investigated and a new collector named Yb105 was adopted to remove iron from potash feldspar ores.The technological mineralogy results indicate that the main com...The technological mineralogy of the potash feldspar was investigated and a new collector named Yb105 was adopted to remove iron from potash feldspar ores.The technological mineralogy results indicate that the main components of the ore were feldspar,sericite,quartz and kaolinite,and iron mainly existed in limonite and hematite,most of which can be removed by beneficiation.The results show the benzohydroxamic acid can not only increase the recovery of iron and reduce the consumption of oleic acid collector,but also enhance the collecting performance of oleic acid at low temperature,which can realize the flotation of the ores at a low temperature and play an important role in saving energy to some extent.Compared with oleic oil,the benzohydroxamic acid had a great advantage in removing iron from potash feldspar,a potash feldspar concentrate with Fe grade of 0.23%,K2O grade of 12.59%and Na2O grade of 0.26%was obtained by flotation with Yb105 as collector,and the yield of the concentrate was 82.55%.展开更多
Three new isocoumarin derivatives,(S)-6,8-dihydroxy-5-(methoxymethyl)-3,7-dimethylisochroman-1-one(1),(S)-6,8-dihydroxy-3,5,7-trimethyl-isochroman-1-one(2) and(R)-2-chloro-3-(8-hydroxy-6-methoxy-1-oxo-1 H-isochromen-3...Three new isocoumarin derivatives,(S)-6,8-dihydroxy-5-(methoxymethyl)-3,7-dimethylisochroman-1-one(1),(S)-6,8-dihydroxy-3,5,7-trimethyl-isochroman-1-one(2) and(R)-2-chloro-3-(8-hydroxy-6-methoxy-1-oxo-1 H-isochromen-3-yl) propyl acetate(3), along with four known compounds(4–7) were isolated from a mangrove endophytic fungus Penicillium sp. YYSJ-3. Their structures were established on the basis of the extensive spectroscopic data and HR-ESI-MS analysis. The absolute configurations of1–3 were further determined by X-ray diffraction analysis and optical rotations. Compounds 3, 6 and 7 showed promising inhibitory activity against α-glucosidase, which were stronger than that of the positive control 1-deoxynojirimycin(IC50 141.2 μmol·L-1).展开更多
基金Project(21776320)supported by the National Natural Science Foundation of ChinaProject(2016TP1007)supported by the Hunan Provincial Science and Technology Plan Project,China
文摘The technological mineralogy of the potash feldspar was investigated and a new collector named Yb105 was adopted to remove iron from potash feldspar ores.The technological mineralogy results indicate that the main components of the ore were feldspar,sericite,quartz and kaolinite,and iron mainly existed in limonite and hematite,most of which can be removed by beneficiation.The results show the benzohydroxamic acid can not only increase the recovery of iron and reduce the consumption of oleic acid collector,but also enhance the collecting performance of oleic acid at low temperature,which can realize the flotation of the ores at a low temperature and play an important role in saving energy to some extent.Compared with oleic oil,the benzohydroxamic acid had a great advantage in removing iron from potash feldspar,a potash feldspar concentrate with Fe grade of 0.23%,K2O grade of 12.59%and Na2O grade of 0.26%was obtained by flotation with Yb105 as collector,and the yield of the concentrate was 82.55%.
基金the National Natural Science Foundation of China (No. 21877133)Guangdong MEPP Fund (No. GDOE-2019A21)the Key Project of Natural Science Foundation of Guangdong Province (No. 2016A040403091) for generous support。
文摘Three new isocoumarin derivatives,(S)-6,8-dihydroxy-5-(methoxymethyl)-3,7-dimethylisochroman-1-one(1),(S)-6,8-dihydroxy-3,5,7-trimethyl-isochroman-1-one(2) and(R)-2-chloro-3-(8-hydroxy-6-methoxy-1-oxo-1 H-isochromen-3-yl) propyl acetate(3), along with four known compounds(4–7) were isolated from a mangrove endophytic fungus Penicillium sp. YYSJ-3. Their structures were established on the basis of the extensive spectroscopic data and HR-ESI-MS analysis. The absolute configurations of1–3 were further determined by X-ray diffraction analysis and optical rotations. Compounds 3, 6 and 7 showed promising inhibitory activity against α-glucosidase, which were stronger than that of the positive control 1-deoxynojirimycin(IC50 141.2 μmol·L-1).
