Extracting vanadium and removing phosphorus simultaneously by adding CaO containing materials to V-bearing hot metal were investigated under the condition of simulating the process of vanadium extraction with insuffic...Extracting vanadium and removing phosphorus simultaneously by adding CaO containing materials to V-bearing hot metal were investigated under the condition of simulating the process of vanadium extraction with insufficiently supplying oxygen in converter. Through preliminary experiments, 3 h and 1375 °C were chosen as the optimum holding time and reaction temperature for formal experiments, respectively. The results of the formal experiments suggest that making basic slag can extract vanadium and remove phosphorus simultaneously. The vanadium extraction rate(ηV) and phosphorus removal rate(ηP) both increase with an increase in the basicity of the original slag materials and the Fe2O3 contents. The vanadium distribution ratio)(V L′is about an order of magnitude greater than the phosphorus distribution ratio),(P L′but the latter is more sensitive to slag basicity than the former. The phosphorus distribution ratio is beyond 6 when the basicity of the original slag materials is beyond 1, which indicates a much better performance of phosphorus removal compared to the phosphorus removal in the current process. Therefore, it is very feasible to properly raise slag basicity to remove phosphorus with consideration of the grade of vanadium slag. The relations between ηV and ηP, and between L′V and L′P are linear under the experimental conditions.展开更多
2008年5—11月,对黄河口滨岸潮滩不同表现型碱蓬(Suaeda salsa)(中潮滩碱蓬,MMS,S.salsa in middle marsh;低潮滩碱蓬,LMS,S.salsa in low marsh)湿地植物-土壤系统V和Co含量的季节动态及其生物累积特征进行了研究。结果表明:MMS和LMS...2008年5—11月,对黄河口滨岸潮滩不同表现型碱蓬(Suaeda salsa)(中潮滩碱蓬,MMS,S.salsa in middle marsh;低潮滩碱蓬,LMS,S.salsa in low marsh)湿地植物-土壤系统V和Co含量的季节动态及其生物累积特征进行了研究。结果表明:MMS和LMS湿地表层土壤中V或Co含量的季节变化差异明显,但同一种湿地土壤中V和Co含量的变化模式相似。MMS(或LMS)湿地土壤的V含量均明显高于Co含量,二者在生长季的变异系数分别为12.01%、12.35%(MMS)和4.08%、4.94%(LMS)。MMS和LMS湿地表层土壤V的地累积指数(I_(geo))大多介于1—2,处于轻度污染状况;Co的I_(geo)大多介于0—1之间,处于无污染到轻度污染状态。V和Co含量在MMS不同部分中整体表现为枯落物>根>叶>茎(P<0.05),而在LMS中表现为枯落物>叶>茎>根(P<0.001)。MMS和LMS不同器官的V或Co转移能力存在较大差异,前者V和Co的R/S(根茎比)、R/L(根叶比)和S/L(茎叶比)大多大于1,后者中两种元素的相应比值则大多小于1。MMS和LMS不同部分的V和Co累积系数(AF)整体均表现为AFV<AFCo,前者分别为后者的0.31—1.32、0.12—5.56、0.08—1.23、0.38—0.65倍(MMS)和0.14—0.84、0.23—0.68、0.34—0.77、0.43—0.56倍(LMS)。研究发现,MMS和LMS湿地土壤中有机质和铁锰氧化物含量的差异是导致二者V和Co含量存在差异的关键因素,而两种碱蓬生理生态学特性、所处生境水盐条件以及V和Co在不同器官扮演生态功能的差异是导致二者植物体内V和Co转移、分配与生物累积差异的重要原因。随着该区潮间带石油开采强度及石油燃料使用的增加,湿地表层土壤的V和Co(特别是V)污染问题将会逐渐凸显,而LMS可用于未来受V污染湿地修复的备选物种。展开更多
基金Project(41603004)supported by the Independent Research Program of State Key Laboratory of Advanced Metallurgy(University of Science and Technology Beijing),China
文摘Extracting vanadium and removing phosphorus simultaneously by adding CaO containing materials to V-bearing hot metal were investigated under the condition of simulating the process of vanadium extraction with insufficiently supplying oxygen in converter. Through preliminary experiments, 3 h and 1375 °C were chosen as the optimum holding time and reaction temperature for formal experiments, respectively. The results of the formal experiments suggest that making basic slag can extract vanadium and remove phosphorus simultaneously. The vanadium extraction rate(ηV) and phosphorus removal rate(ηP) both increase with an increase in the basicity of the original slag materials and the Fe2O3 contents. The vanadium distribution ratio)(V L′is about an order of magnitude greater than the phosphorus distribution ratio),(P L′but the latter is more sensitive to slag basicity than the former. The phosphorus distribution ratio is beyond 6 when the basicity of the original slag materials is beyond 1, which indicates a much better performance of phosphorus removal compared to the phosphorus removal in the current process. Therefore, it is very feasible to properly raise slag basicity to remove phosphorus with consideration of the grade of vanadium slag. The relations between ηV and ηP, and between L′V and L′P are linear under the experimental conditions.
文摘2008年5—11月,对黄河口滨岸潮滩不同表现型碱蓬(Suaeda salsa)(中潮滩碱蓬,MMS,S.salsa in middle marsh;低潮滩碱蓬,LMS,S.salsa in low marsh)湿地植物-土壤系统V和Co含量的季节动态及其生物累积特征进行了研究。结果表明:MMS和LMS湿地表层土壤中V或Co含量的季节变化差异明显,但同一种湿地土壤中V和Co含量的变化模式相似。MMS(或LMS)湿地土壤的V含量均明显高于Co含量,二者在生长季的变异系数分别为12.01%、12.35%(MMS)和4.08%、4.94%(LMS)。MMS和LMS湿地表层土壤V的地累积指数(I_(geo))大多介于1—2,处于轻度污染状况;Co的I_(geo)大多介于0—1之间,处于无污染到轻度污染状态。V和Co含量在MMS不同部分中整体表现为枯落物>根>叶>茎(P<0.05),而在LMS中表现为枯落物>叶>茎>根(P<0.001)。MMS和LMS不同器官的V或Co转移能力存在较大差异,前者V和Co的R/S(根茎比)、R/L(根叶比)和S/L(茎叶比)大多大于1,后者中两种元素的相应比值则大多小于1。MMS和LMS不同部分的V和Co累积系数(AF)整体均表现为AFV<AFCo,前者分别为后者的0.31—1.32、0.12—5.56、0.08—1.23、0.38—0.65倍(MMS)和0.14—0.84、0.23—0.68、0.34—0.77、0.43—0.56倍(LMS)。研究发现,MMS和LMS湿地土壤中有机质和铁锰氧化物含量的差异是导致二者V和Co含量存在差异的关键因素,而两种碱蓬生理生态学特性、所处生境水盐条件以及V和Co在不同器官扮演生态功能的差异是导致二者植物体内V和Co转移、分配与生物累积差异的重要原因。随着该区潮间带石油开采强度及石油燃料使用的增加,湿地表层土壤的V和Co(特别是V)污染问题将会逐渐凸显,而LMS可用于未来受V污染湿地修复的备选物种。
