镜铁矿悬浮磁化焙烧过程中的铁物相与磁性转变研究
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摘要
甘肃某镜铁矿石主要有价元素为铁,TFe含量为59.61%,原矿中94.79%的铁以赤褐铁的形式存在,脉石矿物主要为石英,含量为8.11%。为考察焙烧过程主要影响因素对焙烧产物的物相转化与磁性转变的影响,进行了悬浮焙烧试验。结果表明:镜铁矿经悬浮磁化焙烧后,焙烧产物中铁主要以磁铁矿的形式存在,磁性明显增强;随着焙烧温度升高、焙烧时间延长、CO浓度增加、总气量增加,焙烧产品中镜铁矿含量均逐渐降低,磁铁矿含量均逐渐增加,焙烧产品饱和磁化强度和最大比磁化系数均先提高后降低;在焙烧温度为550℃、焙烧时间为4 min、CO浓度为20%、总气量为600 mL/min时,焙烧产物的比饱和磁化强度为63.66 A·m2/kg、最大比磁化系数为5.02×10-4m3/kg;焙烧过程铁物相按照Fe2O3→Fe3O4→FeO的反应顺序进行,焙烧产物铁物相的转化会影响铁矿物磁性的强弱,并且主要与磁铁矿的含量相关。试验结果可以为我国镜铁矿资源悬浮焙烧过程机理研究提供理论依据。
The main valuable element of a specularite ore in Gansu Province is iron. The content of TFe is 59.61%.94.79% of the iron in the raw ore exists in the form of hematite and limonite. The gangue mineral is mainly quartz and the con?tent is 8.11%. In order to investigate the effect of main factors on phase transformation and magnetic transformation of roasted products,suspension roasting experiments were carried out. The results show that after the suspension magnetization roasting of specularite,the roasted product iron mainly exists in the form of magnetite,and the magnetism is obviously enhanced.With the increase of roasting temperature,roasting time,CO concentration and total gas volume,the content of specularite in roasted products decreases gradually,the content of magnetite increases gradually,and the saturation magnetization and max?imum specific magnetization coefficient of roasted products increase first and then decrease. The specific saturation magnetiza?tion of the roasted product is 63.66 A·m2/kg and the maximum specific magnetization coefficient is 5.02×10-4 m3/kg when the roasting temperature is 550 ℃ and the roasting time is 4 min,the concentration of CO is 20% and the total gas volume is 600 mL/min. The iron phase in the roasting process changes in the order of Fe2 O3→Fe3 O4→FeO. The transformation of the phase of the roasted product will affect the magnetic strength,and is mainly related to the content of magnetite. The experimental re?sults can provide theoretical basis for the mechanism of suspension roasting of specularite resources in China.
The main valuable element of a specularite ore in Gansu Province is iron. The content of TFe is 59.61%.94.79% of the iron in the raw ore exists in the form of hematite and limonite. The gangue mineral is mainly quartz and the con?tent is 8.11%. In order to investigate the effect of main factors on phase transformation and magnetic transformation of roasted products,suspension roasting experiments were carried out. The results show that after the suspension magnetization roasting of specularite,the roasted product iron mainly exists in the form of magnetite,and the magnetism is obviously enhanced.With the increase of roasting temperature,roasting time,CO concentration and total gas volume,the content of specularite in roasted products decreases gradually,the content of magnetite increases gradually,and the saturation magnetization and max?imum specific magnetization coefficient of roasted products increase first and then decrease. The specific saturation magnetiza?tion of the roasted product is 63.66 A·m2/kg and the maximum specific magnetization coefficient is 5.02×10-4 m3/kg when the roasting temperature is 550 ℃ and the roasting time is 4 min,the concentration of CO is 20% and the total gas volume is 600 mL/min. The iron phase in the roasting process changes in the order of Fe2 O3→Fe3 O4→FeO. The transformation of the phase of the roasted product will affect the magnetic strength,and is mainly related to the content of magnetite. The experimental re?sults can provide theoretical basis for the mechanism of suspension roasting of specularite resources in China.
引文
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[3]韩跃新,高鹏,李艳军,等.我国铁矿资源“劣质能用、优质优用”发展战略研究[J].金属矿山,2016(12):2-8.Han Yuexin,Gao Peng,Li Yanjun,et al.Development strategies of available use of inferior quality and optimal use of high quality for domestic iron ore resources[J].Metal Mine,2016(12):2-8.
[4]袁帅,韩跃新,高鹏,等.难选铁矿石悬浮磁化焙烧技术研究现状及进展[J].金属矿山,2016(12):9-12.Yuan Shuai,Han Yuexin,Gao Peng,et al.Research status and development of suspension roasting for refractory iron ore[J].Metal Mine,2016(12):9-12.
[5]余建文,韩跃新,李艳军,等.鞍山式赤铁矿预选粗精矿悬浮态磁化焙烧-磁选试验研究[J].中南大学学报:自然科学版,2018,49(4):771-778.Yu Jianwen,Han Yuexin,Li Yanjun,et al.Experimental study on utilization of crude concentrate from an Anshan-type hematite ore by suspension magnetization roasting-magnetic separation[J].Journal of Central South University:Science and Technology,2018,49(4):771-7781.
[6]袁帅,韩跃新,李艳军,等.国外某赤铁矿石悬浮磁化焙烧-磁选试验[J].金属矿山,2018(8):70-72.Yuan Shuai,Han Yuexin,Li Yanjun,et al.Research on suspension roasting-low intensity magnetic separation of a foreign hematite ore[J].Metal Mine,2018(8):70-72.
[7]王儒,韩跃新,李艳军,等.鲕状赤铁矿悬浮焙烧的磁性研究[J].东北大学学报:自然科学版,2015,36(7):1024-1028.Wang Ru,Han Yuexin,Li Yanjun,et al.Research on magnetic properties of oolitichematiteroasted by suspension roasting furnace[J].Journal of Northeastern University:Natural Science,2015,36(7):1024-1028.
[8]王景宽,蔡代佑.铁矿石竖炉磁化焙烧的热耗[J].金属矿山,1977(5):37-40.Wang Jingkuan,Cai Daiyou.Heat consumption of magnetized roasting for iron ore shaft furnace[J].Metal Mine,1977(5):37-40.
[9]马浩,陈铁军,黄献宝,等.15~5 mm酒钢镜铁矿石回转窑焙烧结圈可能性研究[J].金属矿山,2014(11):92-95.Ma Hao,Chen Tiejun,Huang Xianbao,et al.Study on the ringing possibility of speculariteparticlesranging from 5 to 15 mm in rotary kiln in Jiustee[lJ].Metal Mine,2014(11):92-95.
[10]任亚峰,余永富.难选红铁矿磁化焙烧技术现状及发展方向[J].金属矿山,2005(11):20-23.Ren Yafeng,Yu Yongfu.Present status and development orientation of magnetization roasting technology for refractory red iron ores[J].Metal Mine,2005(11):20-23.
[11]高鹏,余建文,张淑敏,等.东鞍山铁矿混磁精矿悬浮焙烧-弱磁选试验研究[J].金属矿山,2016(12):18-22.Gao Peng,Yu Jianwen,Zhang Shumin,et al.Experimental study on suspension roasting-low intensity magnetic separation of magnetic mixed concentrate from Donganshan[J].Metal Mine,2016(12):18-22.
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