Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction me...Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na2TiO3, then the resultant Na2TiO3 reacts with 3CaO·Al2O3·6H2O resulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO2·H2O which eventually converts into CaTiO3. Higher temperature, concentration of free Na2Ok (the caustic soda uncombined with aluminate anions in the form of Na2O) and molar ratio of CaO to TiO2 are favorable to the conversion of CaO·2TiO2·H2O to CaTiO3. And Al(OH)4- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite.展开更多
细胞白噬（autophagv）是细胞在自噬相关基因（autophagy related gene，atg）的调控下利用溶酶体降解自身受损的细胞器和大分子物质的过程，是以胞质内自噬体的出现为标志的细胞自我消化过程。广义上的自噬包括巨自噬（macmautophagy...细胞白噬（autophagv）是细胞在自噬相关基因（autophagy related gene，atg）的调控下利用溶酶体降解自身受损的细胞器和大分子物质的过程，是以胞质内自噬体的出现为标志的细胞自我消化过程。广义上的自噬包括巨自噬（macmautophagy）、小自噬（mieroautophagy）和分子伴侣介导的自噬（chaperone-mediated autophagy，CMA）3种类型。在哺乳动物中研究最多的是巨自噬，即通常说的自噬。展开更多
Several methods of deep desulfurization in alumina production process were studied, and the costs of these methods were compared. It is found that most of the S2- in sodium aluminate solution can be removed by adding ...Several methods of deep desulfurization in alumina production process were studied, and the costs of these methods were compared. It is found that most of the S2- in sodium aluminate solution can be removed by adding sodium nitrate or hydrogen peroxide in digestion process, and in this way the effect of S2- on alumina product quality is eliminated. However, the removal efficiency of 2?32OS in sodium aluminate solution is very low by this method. Both S2- and 2?32OS in sodium aluminate solution can be removed completely by wet oxidation method in digestion process. The cost of desulfurization by wet oxidation is lower than by adding sodium nitrate or hydrogen peroxide. The results of this research reveal that wet oxidation is an economical and feasible method for the removal of sulfur in alumina production process to improve alumina quality, and provide valuable guidelines for alumina production by high-sulfur bauxite.展开更多
基金Project(2005CB6237-02) supported by the National Basic Research Program of China
文摘Based on the study of influence of temperature, digestion time, amount of CaO added and composition of aluminate solution on reaction behavior of pure anatase in high-pressure digestion process of bauxite, reaction mechanism of anatase was preliminarily determined. Anatase first reacts with caustic soda to produce Na2TiO3, then the resultant Na2TiO3 reacts with 3CaO·Al2O3·6H2O resulting from the reaction of CaO with sodium aluminate solution to produce CaO·2TiO2·H2O which eventually converts into CaTiO3. Higher temperature, concentration of free Na2Ok (the caustic soda uncombined with aluminate anions in the form of Na2O) and molar ratio of CaO to TiO2 are favorable to the conversion of CaO·2TiO2·H2O to CaTiO3. And Al(OH)4- shows the function of a catalyzer in the reaction of anatase with caustic soda with or without CaO added during the digestion process of diasporic bauxite.
文摘细胞白噬（autophagv）是细胞在自噬相关基因（autophagy related gene，atg）的调控下利用溶酶体降解自身受损的细胞器和大分子物质的过程，是以胞质内自噬体的出现为标志的细胞自我消化过程。广义上的自噬包括巨自噬（macmautophagy）、小自噬（mieroautophagy）和分子伴侣介导的自噬（chaperone-mediated autophagy，CMA）3种类型。在哺乳动物中研究最多的是巨自噬，即通常说的自噬。
基金Project(51404121)supported by the National Natural Science Foundation of ChinaProject(KKSY201452041)supported by Yunnan Provincal Personnel Training Funds for Kunming University of Science and Technology,China
文摘Several methods of deep desulfurization in alumina production process were studied, and the costs of these methods were compared. It is found that most of the S2- in sodium aluminate solution can be removed by adding sodium nitrate or hydrogen peroxide in digestion process, and in this way the effect of S2- on alumina product quality is eliminated. However, the removal efficiency of 2?32OS in sodium aluminate solution is very low by this method. Both S2- and 2?32OS in sodium aluminate solution can be removed completely by wet oxidation method in digestion process. The cost of desulfurization by wet oxidation is lower than by adding sodium nitrate or hydrogen peroxide. The results of this research reveal that wet oxidation is an economical and feasible method for the removal of sulfur in alumina production process to improve alumina quality, and provide valuable guidelines for alumina production by high-sulfur bauxite.
