为充分开发利用白云鄂博铌矿资源,采用中磁选—中强磁选—强磁选工艺流程,对霓石型含铌矿物进行了分质磁选及工艺矿物学研究,探究不同磁分选产物的矿物组成、解离度、连生及赋存状态等工艺矿物特性差异,揭示铌矿物在磁选流程中的走向。...为充分开发利用白云鄂博铌矿资源,采用中磁选—中强磁选—强磁选工艺流程,对霓石型含铌矿物进行了分质磁选及工艺矿物学研究,探究不同磁分选产物的矿物组成、解离度、连生及赋存状态等工艺矿物特性差异,揭示铌矿物在磁选流程中的走向。结果表明:在238.85 k A/m磁场强度条件下,中磁选流程脱铁率达62.57%,可降低磁/赤铁矿对后续铌浮选的不利影响;在0.5 T磁感应强度条件下,中强磁选精矿中萤石、磷灰石、方解石及重晶石等含钙钡脉石矿物大幅降低,简化了含铌矿的矿物组成,利于铌矿物进一步分离富集;在1.4 T磁感应强度条件下,强磁选精矿铌品位由原矿的0.17%提高至0.219%,强磁选尾矿中主要含铌矿物为烧绿石,铌矿物组成简单。研究结果可为改进铌矿物磁选分离工艺、提高后续铌矿物浮选效果提供理论指导。展开更多
The chemical,physical,thermal and texture properties of iron ores from different regions of Odisha and Chhattisgarh regions,India,have been investigated to understand the compositional variations of Fe,Al2O3,SiO2,S an...The chemical,physical,thermal and texture properties of iron ores from different regions of Odisha and Chhattisgarh regions,India,have been investigated to understand the compositional variations of Fe,Al2O3,SiO2,S and P.They were analyzed for its susceptibility to meet the industrial requirements,for various iron manufacture techniques.Chemical analysis indicated that the majority of the iron ores is rich in hematite(>90wt%),poor in gangue(<4.09wt%SiO2and<3.8wt%Al2O3)and deleterious elements(P<0.065wt%and S<0.016wt%)in all these iron ores found to be low.XRD peaks reviled that the gangue is in the form of kaolinite and quartz,and same was observed in Fourier transform infrared(FTIR)spectroscopy in the range of914to1034cm–1.The iron ores were found to have excellent physical properties exemplify with tumbler index(82wt%–91wt%),abrasion index(1.27wt%–4.87wt%)and shatter index(0.87wt%–1.64wt%).FTIR and thermal analysis were performed to assimilate the analysis interpolations.It was found that these iron ores exhibit three endothermic reactions,which are dehydration below447K with mass loss of0.13wt%to1.7wt%,dehydroxylation at525–609K with mass loss of1.09wt%–4.49wt%and decomposition of aluminosilicates at597–850K with mass loss of0.13wt%–1.15wt%.From this study,we can conclude that due to its excellent physico-chemical characteristics,these iron ores are suitable for BF and DRI operations.展开更多
文摘为充分开发利用白云鄂博铌矿资源,采用中磁选—中强磁选—强磁选工艺流程,对霓石型含铌矿物进行了分质磁选及工艺矿物学研究,探究不同磁分选产物的矿物组成、解离度、连生及赋存状态等工艺矿物特性差异,揭示铌矿物在磁选流程中的走向。结果表明:在238.85 k A/m磁场强度条件下,中磁选流程脱铁率达62.57%,可降低磁/赤铁矿对后续铌浮选的不利影响;在0.5 T磁感应强度条件下,中强磁选精矿中萤石、磷灰石、方解石及重晶石等含钙钡脉石矿物大幅降低,简化了含铌矿的矿物组成,利于铌矿物进一步分离富集;在1.4 T磁感应强度条件下,强磁选精矿铌品位由原矿的0.17%提高至0.219%,强磁选尾矿中主要含铌矿物为烧绿石,铌矿物组成简单。研究结果可为改进铌矿物磁选分离工艺、提高后续铌矿物浮选效果提供理论指导。
基金Project supported by the National Institute of Technology,Rourkela,India
文摘The chemical,physical,thermal and texture properties of iron ores from different regions of Odisha and Chhattisgarh regions,India,have been investigated to understand the compositional variations of Fe,Al2O3,SiO2,S and P.They were analyzed for its susceptibility to meet the industrial requirements,for various iron manufacture techniques.Chemical analysis indicated that the majority of the iron ores is rich in hematite(>90wt%),poor in gangue(<4.09wt%SiO2and<3.8wt%Al2O3)and deleterious elements(P<0.065wt%and S<0.016wt%)in all these iron ores found to be low.XRD peaks reviled that the gangue is in the form of kaolinite and quartz,and same was observed in Fourier transform infrared(FTIR)spectroscopy in the range of914to1034cm–1.The iron ores were found to have excellent physical properties exemplify with tumbler index(82wt%–91wt%),abrasion index(1.27wt%–4.87wt%)and shatter index(0.87wt%–1.64wt%).FTIR and thermal analysis were performed to assimilate the analysis interpolations.It was found that these iron ores exhibit three endothermic reactions,which are dehydration below447K with mass loss of0.13wt%to1.7wt%,dehydroxylation at525–609K with mass loss of1.09wt%–4.49wt%and decomposition of aluminosilicates at597–850K with mass loss of0.13wt%–1.15wt%.From this study,we can conclude that due to its excellent physico-chemical characteristics,these iron ores are suitable for BF and DRI operations.
