In this study, a method for preparing pure manganese sulfate from low-grade ores with a granule mean size of 0.47 mm by direct acid leaching was developed. The effects of the types of leaching agents, sulfitric acid c...In this study, a method for preparing pure manganese sulfate from low-grade ores with a granule mean size of 0.47 mm by direct acid leaching was developed. The effects of the types of leaching agents, sulfitric acid concentration, reaction temperature, and agitation rate on the leaching efficiency of manganese were investigated. We observed that sulfuric acid used as a leaching agent provides a similar leach- ing efficiency of manganese and superior selectivity against calcium compared to hydrochloric acid. The optimal leaching conditions in sul- furic acid media were determined; under the optimal conditions, the leaching efficiencies of Mn and Ca were 92.42% and 9.61%, respec- tively. Moreover, the kinetics of manganese leaching indicated that the leaching follows the diffusion-controlled model with an apparent ac- tivation energy of 12.28 kJ·mol-l. The purification conditions of the leaching solution were also discussed. The results show that manganese dioxide is a suitable oxidant of ferrous ions and sodium dimethyldithiocarbamate is an effective precipitant of heavy metals. Finally, through chemical analysis and X-ray diffraction analysis, the obtained product was determined to contain 98% of MnSOa4·H20.展开更多
慢性丙型肝炎的治疗方案主要包括聚乙二醇化干扰素联合利巴韦林（peg-interferon plus ribavirin,PR）以及直接抗病毒药物（direct-acting antiviral agents,DAAs）.PR由于适应证、疗效、不良反应以及疗程等方面的局限性,在逐渐退出丙...慢性丙型肝炎的治疗方案主要包括聚乙二醇化干扰素联合利巴韦林（peg-interferon plus ribavirin,PR）以及直接抗病毒药物（direct-acting antiviral agents,DAAs）.PR由于适应证、疗效、不良反应以及疗程等方面的局限性,在逐渐退出丙型肝炎治疗的舞台.DAAs的出现使丙型肝炎病毒（hepatitis C virus,HCV）的治疗发生了革命性的转变.展开更多
基金supported by the National Natural Science Foundation of China (51374249)
文摘In this study, a method for preparing pure manganese sulfate from low-grade ores with a granule mean size of 0.47 mm by direct acid leaching was developed. The effects of the types of leaching agents, sulfitric acid concentration, reaction temperature, and agitation rate on the leaching efficiency of manganese were investigated. We observed that sulfuric acid used as a leaching agent provides a similar leach- ing efficiency of manganese and superior selectivity against calcium compared to hydrochloric acid. The optimal leaching conditions in sul- furic acid media were determined; under the optimal conditions, the leaching efficiencies of Mn and Ca were 92.42% and 9.61%, respec- tively. Moreover, the kinetics of manganese leaching indicated that the leaching follows the diffusion-controlled model with an apparent ac- tivation energy of 12.28 kJ·mol-l. The purification conditions of the leaching solution were also discussed. The results show that manganese dioxide is a suitable oxidant of ferrous ions and sodium dimethyldithiocarbamate is an effective precipitant of heavy metals. Finally, through chemical analysis and X-ray diffraction analysis, the obtained product was determined to contain 98% of MnSOa4·H20.
文摘慢性丙型肝炎的治疗方案主要包括聚乙二醇化干扰素联合利巴韦林（peg-interferon plus ribavirin,PR）以及直接抗病毒药物（direct-acting antiviral agents,DAAs）.PR由于适应证、疗效、不良反应以及疗程等方面的局限性,在逐渐退出丙型肝炎治疗的舞台.DAAs的出现使丙型肝炎病毒（hepatitis C virus,HCV）的治疗发生了革命性的转变.
