Total ilmenite from Yunnan, China, difficult to smelt in blast furnace, was smelted by oxygen-enriched top-blown smelting reduction ironmaking technology. Much more details on smelting were discussed. Specifically, th...Total ilmenite from Yunnan, China, difficult to smelt in blast furnace, was smelted by oxygen-enriched top-blown smelting reduction ironmaking technology. Much more details on smelting were discussed. Specifically, the influence of reduction temperature, slag basicity and molar ratio of carbon to oxygen on the reduction quality level including iron recovery and titanium and sulfur contents in the pig iron produced in the experiment was investigated. Iron recovery rate could reach 95 % with titanium content below 0.05 % in pig iron produced, under the conditions of holding time of 30 min at 1 823 K, basicity of 1.1, carbon to oxygen molar ratio of 1.0 and oxygen enriched flow rate of 250 L/h. Oxidization potential of top-space of smelting reduction vessel and slag combination could create the driv ing force to partition phosphorous, titanium and silicon into the slag, which ensured low contents of the impurities involved above and carbon in pig iron. In addition, it avoided the generation of Ti（C,N） that could reduce interracial tension of slag, which induced the formation of foaming slag seriously. Furthermore, jam of chargings and bubble flooding would be triggered, resulting in deterioration of BF state, increase of iron loss and decline of desulfurization rate.展开更多
基于Web of Science (WoS)和中国知网(CNKI)科学文献,运用文献计量统计和可视化方法,对25年农村生活污水处理研究领域发文量、主要发文国家、主要作者和关键词等指标进行分析。1995—2019年WoS和CNKI数据库分别收录该领域文献883篇和58...基于Web of Science (WoS)和中国知网(CNKI)科学文献,运用文献计量统计和可视化方法,对25年农村生活污水处理研究领域发文量、主要发文国家、主要作者和关键词等指标进行分析。1995—2019年WoS和CNKI数据库分别收录该领域文献883篇和584篇。WoS中的文献涉及全球64个国家,其中中国发文量占总发文量的22.2%,领先于欧美发达国家。主要发文作者方面,中国学者吕锡武在WoS和CNKI数据库中发文量累计达到22篇,位居全球榜首。综合WoS和CNKI数据库,"污水处理""农村生活污水"和"人工湿地"为文献高频关键词,表明该领域的核心内容是一直围绕农村生活污水的处理和常用处理工艺人工湿地研究。近25年来,农村生活污水处理研究领域主要从早期污水处理工艺选择和应用、目标污染物去除效果以及处理设施运行成本等方面逐步过渡发展到微生物群落角度揭示去除机理、GIS解析源头以及与农村人居环境整治的相互作用关系等方面。展开更多
基金Item Sponsored by Provincial Natural Science Foundation of Yunnan Province of China (2009ZC014 M)
文摘Total ilmenite from Yunnan, China, difficult to smelt in blast furnace, was smelted by oxygen-enriched top-blown smelting reduction ironmaking technology. Much more details on smelting were discussed. Specifically, the influence of reduction temperature, slag basicity and molar ratio of carbon to oxygen on the reduction quality level including iron recovery and titanium and sulfur contents in the pig iron produced in the experiment was investigated. Iron recovery rate could reach 95 % with titanium content below 0.05 % in pig iron produced, under the conditions of holding time of 30 min at 1 823 K, basicity of 1.1, carbon to oxygen molar ratio of 1.0 and oxygen enriched flow rate of 250 L/h. Oxidization potential of top-space of smelting reduction vessel and slag combination could create the driv ing force to partition phosphorous, titanium and silicon into the slag, which ensured low contents of the impurities involved above and carbon in pig iron. In addition, it avoided the generation of Ti（C,N） that could reduce interracial tension of slag, which induced the formation of foaming slag seriously. Furthermore, jam of chargings and bubble flooding would be triggered, resulting in deterioration of BF state, increase of iron loss and decline of desulfurization rate.
文摘基于Web of Science (WoS)和中国知网(CNKI)科学文献,运用文献计量统计和可视化方法,对25年农村生活污水处理研究领域发文量、主要发文国家、主要作者和关键词等指标进行分析。1995—2019年WoS和CNKI数据库分别收录该领域文献883篇和584篇。WoS中的文献涉及全球64个国家,其中中国发文量占总发文量的22.2%,领先于欧美发达国家。主要发文作者方面,中国学者吕锡武在WoS和CNKI数据库中发文量累计达到22篇,位居全球榜首。综合WoS和CNKI数据库,"污水处理""农村生活污水"和"人工湿地"为文献高频关键词,表明该领域的核心内容是一直围绕农村生活污水的处理和常用处理工艺人工湿地研究。近25年来,农村生活污水处理研究领域主要从早期污水处理工艺选择和应用、目标污染物去除效果以及处理设施运行成本等方面逐步过渡发展到微生物群落角度揭示去除机理、GIS解析源头以及与农村人居环境整治的相互作用关系等方面。
