This study aims to beneficiate low grade goethitic iron ore fines using a selective flocculation process. Selective flocculation studies were conducted using different polymers such as starch amylopectin(AP), poly acr...This study aims to beneficiate low grade goethitic iron ore fines using a selective flocculation process. Selective flocculation studies were conducted using different polymers such as starch amylopectin(AP), poly acrylic acid(PAA), and a graft copolymer(AP-g-PAA). The obtained results were analyzed; they indicate the enhancement of the iron ore grade from 58.49% to 67.52% using AP-g-PAA with a recovery of 95.08%. In addition, 64.45% Fe with a recovery of 88.79% was obtained using AP. Similarly, using PAA, the grade increased to 63.46% Fe with a recovery of 82.10%. The findings are also supported by characterizing concentrates using X-ray diffraction(XRD) and electron probe microanalysis(EPMA) techniques.展开更多
Manganese recoveries from low-grade ores using organic acids as reducing agents were investigated in the present work. The acid leaching potential of both oxalic acid and citric acid were estimated. Manganese leaching...Manganese recoveries from low-grade ores using organic acids as reducing agents were investigated in the present work. The acid leaching potential of both oxalic acid and citric acid were estimated. Manganese leaching amount were measured by using standard manganese curve and estimated by titration method. Effects of various acid concentrations on leaching efficiency were studied. The observed result suggested prominent manganese recovery of 66% by oxalic acid at 2 M concentration whereas citric acid had less effect on leaching showing leaching percentage upto 40% in 6 days. Acid leaching of manganese ore with both the acids gave a comparative data stating that oxalic acid leached better than citric acid.展开更多
研究了含钠添加剂强化某高硅低品位铁矿石内配碳球团的还原过程,并借助光学显微镜和扫描电镜分析了含钠添加剂掺量对内配碳球团还原行为及其强度变化的影响。结果表明:球团中配加含钠添加剂不仅可明显强化该铁矿石的还原行为,大幅度提...研究了含钠添加剂强化某高硅低品位铁矿石内配碳球团的还原过程,并借助光学显微镜和扫描电镜分析了含钠添加剂掺量对内配碳球团还原行为及其强度变化的影响。结果表明:球团中配加含钠添加剂不仅可明显强化该铁矿石的还原行为,大幅度提高焙烧球团的金属化率及其磨选产品的铁品位,同时还可明显提高焙烧球团的强度,降低焙烧球团的粉化率。钠盐配加量为3%的内配碳球团在960℃下还原40 min,所得焙烧产物的金属化率为86.21%,产品铁晶粒增大、连晶增多,孔洞显著减少,结构致密,还原过程的粉化率降至2.57%;焙烧产品在磨矿细度为-0.045 mm占96.15%情况下进行弱磁选(磁场强度180 k A/m),获得的精矿铁品位为87.93%,明显优于不添加钠盐情况下的指标(金属化率为45.62%,粉化率为35.39%,精矿铁品位为58.12%)。展开更多
基金the National Metallurgical Laboratory,Jamshedpur for their kind support
文摘This study aims to beneficiate low grade goethitic iron ore fines using a selective flocculation process. Selective flocculation studies were conducted using different polymers such as starch amylopectin(AP), poly acrylic acid(PAA), and a graft copolymer(AP-g-PAA). The obtained results were analyzed; they indicate the enhancement of the iron ore grade from 58.49% to 67.52% using AP-g-PAA with a recovery of 95.08%. In addition, 64.45% Fe with a recovery of 88.79% was obtained using AP. Similarly, using PAA, the grade increased to 63.46% Fe with a recovery of 82.10%. The findings are also supported by characterizing concentrates using X-ray diffraction(XRD) and electron probe microanalysis(EPMA) techniques.
文摘Manganese recoveries from low-grade ores using organic acids as reducing agents were investigated in the present work. The acid leaching potential of both oxalic acid and citric acid were estimated. Manganese leaching amount were measured by using standard manganese curve and estimated by titration method. Effects of various acid concentrations on leaching efficiency were studied. The observed result suggested prominent manganese recovery of 66% by oxalic acid at 2 M concentration whereas citric acid had less effect on leaching showing leaching percentage upto 40% in 6 days. Acid leaching of manganese ore with both the acids gave a comparative data stating that oxalic acid leached better than citric acid.
文摘研究了含钠添加剂强化某高硅低品位铁矿石内配碳球团的还原过程,并借助光学显微镜和扫描电镜分析了含钠添加剂掺量对内配碳球团还原行为及其强度变化的影响。结果表明:球团中配加含钠添加剂不仅可明显强化该铁矿石的还原行为,大幅度提高焙烧球团的金属化率及其磨选产品的铁品位,同时还可明显提高焙烧球团的强度,降低焙烧球团的粉化率。钠盐配加量为3%的内配碳球团在960℃下还原40 min,所得焙烧产物的金属化率为86.21%,产品铁晶粒增大、连晶增多,孔洞显著减少,结构致密,还原过程的粉化率降至2.57%;焙烧产品在磨矿细度为-0.045 mm占96.15%情况下进行弱磁选(磁场强度180 k A/m),获得的精矿铁品位为87.93%,明显优于不添加钠盐情况下的指标(金属化率为45.62%,粉化率为35.39%,精矿铁品位为58.12%)。
