Chrom-pyroaurite, associated with serpentine, chromite, magnetite, ehaleopyrite,pyrite and etc., is found in serpentinite in Southwestern China. Its coiour is violet in aggregate, but colorless or pale pink in thin fr...Chrom-pyroaurite, associated with serpentine, chromite, magnetite, ehaleopyrite,pyrite and etc., is found in serpentinite in Southwestern China. Its coiour is violet in aggregate, but colorless or pale pink in thin fragments. The mineral is transparent with glassy luster. Specific gravity 2.12±0.01 (determined by s.g. bottle).Hardness 1--1.5. It occurs in massive aggregate and is of apparent greasy feel. Under microscope it has scaly and fibrous appearance. Pleochroism is not clear with N.--colorless, No--pale pink. Uniaxial negative. No = 1.5560, N, = 1.5450, No -- N4=0.011. Apparent endothermic peaks are noticed at 270° and 460℃ respectively.Chemical composition is gaven as: MgO 36.74, 35.62; FeO 0.1, 0.15; MuO 0.06, 0.01;Fe2O3 13.54, 12.79; Cr2O3 6.94, 7.49; Al2O3 2.21, 1.74; CO2 6.45, 7.78; H2O^+ 32.33, 32.30;H2O^- 2.38, 1.78; total 100.75, 100.56. The mineral belongs to trigonal system, α0=6.165A, c0= 46.760A, c0/α0 = 7.585. Cell dimension V= 1537A^3, Z = 3. Strongest Xray pattern lines are 10.48(8), 8.56(5), 7.8(10), 5.12(4), 3.89(10), 2.60(5), 1.99(6).The mineral is named after its eomposition.展开更多
为开发利用辽宁朝阳地区低镁钒钛磁铁矿资源,以石墨为还原剂,研究了还原温度、还原时间对低镁钒钛磁铁矿内配碳球团还原过程的影响,并进行了反应动力学研究,并采用扫描电镜-能谱仪(SEM-EDS)等分析方法对还原控制机制进行了分析。通过计...为开发利用辽宁朝阳地区低镁钒钛磁铁矿资源,以石墨为还原剂,研究了还原温度、还原时间对低镁钒钛磁铁矿内配碳球团还原过程的影响,并进行了反应动力学研究,并采用扫描电镜-能谱仪(SEM-EDS)等分析方法对还原控制机制进行了分析。通过计算分析确定低镁钒钛磁铁矿还原过程限制性环节为O原子在产物层内的扩散,反应表观活化能为228.80 k J/mol。研究结果表明,低镁钒钛磁铁矿与攀西地区钒钛磁铁矿相比,易于还原。当还原温度超过1 200℃时,球团均能快速进行反应;延长还原反应时间,还原产生的金属铁从矿物颗粒外表面到内部依次析出,球团内部新生相界面逐渐清晰。展开更多
文摘Chrom-pyroaurite, associated with serpentine, chromite, magnetite, ehaleopyrite,pyrite and etc., is found in serpentinite in Southwestern China. Its coiour is violet in aggregate, but colorless or pale pink in thin fragments. The mineral is transparent with glassy luster. Specific gravity 2.12±0.01 (determined by s.g. bottle).Hardness 1--1.5. It occurs in massive aggregate and is of apparent greasy feel. Under microscope it has scaly and fibrous appearance. Pleochroism is not clear with N.--colorless, No--pale pink. Uniaxial negative. No = 1.5560, N, = 1.5450, No -- N4=0.011. Apparent endothermic peaks are noticed at 270° and 460℃ respectively.Chemical composition is gaven as: MgO 36.74, 35.62; FeO 0.1, 0.15; MuO 0.06, 0.01;Fe2O3 13.54, 12.79; Cr2O3 6.94, 7.49; Al2O3 2.21, 1.74; CO2 6.45, 7.78; H2O^+ 32.33, 32.30;H2O^- 2.38, 1.78; total 100.75, 100.56. The mineral belongs to trigonal system, α0=6.165A, c0= 46.760A, c0/α0 = 7.585. Cell dimension V= 1537A^3, Z = 3. Strongest Xray pattern lines are 10.48(8), 8.56(5), 7.8(10), 5.12(4), 3.89(10), 2.60(5), 1.99(6).The mineral is named after its eomposition.
文摘为开发利用辽宁朝阳地区低镁钒钛磁铁矿资源,以石墨为还原剂,研究了还原温度、还原时间对低镁钒钛磁铁矿内配碳球团还原过程的影响,并进行了反应动力学研究,并采用扫描电镜-能谱仪(SEM-EDS)等分析方法对还原控制机制进行了分析。通过计算分析确定低镁钒钛磁铁矿还原过程限制性环节为O原子在产物层内的扩散,反应表观活化能为228.80 k J/mol。研究结果表明,低镁钒钛磁铁矿与攀西地区钒钛磁铁矿相比,易于还原。当还原温度超过1 200℃时,球团均能快速进行反应;延长还原反应时间,还原产生的金属铁从矿物颗粒外表面到内部依次析出,球团内部新生相界面逐渐清晰。
