Comparison of the Effects of Different Additives on the Solid Phase Carbon Thermal Reduction of Ilmenite〓

doi:10.12068/j.issn.1005-3026.2013.11.020

Abstract

Abstract: The effects of adding FeSi， Na2B4O7， Na2CO3 on the solid phase reduction behaviors of ilmenite were studied with the thermogravimetric analysis (TG). From the analysis of the TG， DTG and DSC curves， the results showed that the mass loss ratio of the mixture of the ilmemite and coke during the reduction decreased by adding FeSi， while increased by adding Na2CO3 or Na2B4O7. All the three additives reduced the temperature at which the maximum reaction rate was obtained. The maximum mass loss rates of the reduction process both were increased with the addition of Na2CO3 or Na2B4O7 for 013%/min and 018%/min respectively; while the maximum mass loss rate decreased with the addition of FeSi. The mechanism of intensifying reduction of ilmenite were analyzed. The heat generated by the reaction of Si with Fe increases the temperature of reaction system. The mass transfer of the reactant during the reduction prcess is improved with the addition of Na2B4O7 due to its low melting temperature point， while the gasification reaction of C can be enhanced with the addition of Na2CO3.

Key words: ilmenite, additives, solid phase reduction, thermogravimetry, mass loss rates

CLC Number:

TF5332+7

LYU Xuewei， ZHANG Kai， HUANG Run， SONG Bing. Comparison of the Effects of Different Additives on the Solid Phase Carbon Thermal Reduction of Ilmenite〓[J]. Journal of Northeastern University(Natural Science), 2013, 34(11): 1601-1605.

References

[1] 王玉明.钛铁矿碳热还原动力学［J］.矿冶工程，2011，31(5):66/68.(Wang Yuming.Kinetics of carbothermic reduction of ilmenite［J］.Mining and Metallurgical Engineering，2011，31(5):66/68.)
[2] Mo W，Deng G Z，Luo F.Titanium metallurgy［M］.Beijing:Metallurgical Industry Press，1998.
[3] Qiu G Z，Guo Y F.A review on beneficiationmethods of titaniumcontaining iron ores［J］.Multipurpose Utilization of Mineral Resources，1998(5):29/33.
[4] Guo Y F，You G，Jing T，et al.Solidstate reduction behavior of Panzhihua ilmenite［J］.Journal of Central South University:Science and Technology，2010，41(5):1640/1644.
[5] Wu J H，Sun K.The cooperative catalytic effect of alkali chlorides on the carbothermic reduction of preoxidized ilmenite［J］.Journal of Guangdong Nonferrous Metals，2000，10(1):25/29.
[6] Zhang Y J，Wu Y H，Wang H Z，et al.Research on catalysis of alkah metal carbonate to carbonheating reduce reaction of perilmenite ore［J］.Nonferrous Metallurgy，2001，17(4):105/110.
[7] Zambrano A P，Takano C，Mourao M B，et al.High carbon ferrochromium production by selfreducing process:effects of FeSi and fluxing agent additions［J］.ISIJ International，2011，51(8):1296/1300.
[8] Chen D B，Song L，Wang T，et al.Solid state reduction of panzhihua titanomagnetite concentrates with pulverized coal［J］.Minerals Engineering，2011，24(8):864/869.
[9] Zhou L H，Zeng F H.Statistical analysis of the effect of Na2CO3 as additive on the reduction of vanadictitanomagnetitecoal mixed pellets［J］.Advanced Materials Research，2010，97:465/470.
[10] Moharty B P，Smith K.Alkali metal catalysis of carbothermic reduction of ilmenite［J］.TransactionsInstitution of Mining and Metallurgy，Section C:Mineral Processing & Extractive Metallurgy，1993，102:751/755.