岩浆岩型含钛铁精矿降钛研究
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摘要
为了探究通过提高磨矿细度降低河北柏泉磁选铁精矿钛含量的可行性,采用搅拌磨细磨(超细磨)—弱磁选工艺对试样进行降钛研究,在磨矿细度d90为34.7μm,弱磁选磁场强度为83.6 k A/m的条件下,铁精矿TFe品位可由63.39%增加到65.48%,TFe品位达到一级铁精粉要求,且TFe回收率为97.85%,但铁精矿中杂质TiO2含量仅能降低1.04个百分点。通过XRD分析以及工艺矿物学分析查明,试样中钛主要存在于钛磁铁矿中;搅拌磨细磨(超细磨)—弱磁选工艺可以脱除铁精矿中的钛铁矿和钛赤铁矿,但是钛磁铁矿与磁铁矿属于类质同象,物理化学性质非常相近,难以通过磁选分离,这是该铁精矿的钛元素难以大量脱除的原因。研究结果表明,此类岩浆岩型高钛铁精矿品质较优,但钛不能通过选矿脱除,可用作其他低钛铁精粉高炉冶炼的配料。
In order to explore the feasibility of reducing the TiO2 content of magnetic iron concentrate from Baiquan mine by increasing the fineness of grinding,fine/ultrafine grinding-low intensity magnetic separation process was used for tita?nium removal of the titanium-bearing iron concentrate. Under the optimal conditions of grinding fineness d90=34.7 μm and magnetic field intensity of 83.6 kA/m,the TFe grade of iron concentrate could be increased from 63.39% to 65.48%,meeting the requirements of first grade iron concentrate,and the recovery rate was 97.85%. At the same time,the content of impurity TiO2 in iron concentrate could be reduced by 1.04 percentage points. X-ray diffraction analysis and mineralogy characteristics analysis of the titanium-containing concentrate revealed that titanium in the high ferrotitanium concentrate was mainly present?ed in titanomagnetite. The impurities ilmenite and titanium-hematite could be removed from the high ferrotitanium concentrate by fine/ultrafine grinding-low intensity magnetic separation process. However,titanomagnetite and magnetite belong to the same kind of similarity,and their physicochemical properties are very similar,which is difficult to separate by magnetic sepa?ration. This is the reason why the titanium element of the iron concentrate was difficult to remove significantly. The research re?sults show that the titanium in such kind of high-titanium iron concentrate cannot be removed by beneficiation,but its quality is pretty good and it is very suitable for use as ingredients in other low-titanium iron concentrates.
In order to explore the feasibility of reducing the TiO2 content of magnetic iron concentrate from Baiquan mine by increasing the fineness of grinding,fine/ultrafine grinding-low intensity magnetic separation process was used for tita?nium removal of the titanium-bearing iron concentrate. Under the optimal conditions of grinding fineness d90=34.7 μm and magnetic field intensity of 83.6 kA/m,the TFe grade of iron concentrate could be increased from 63.39% to 65.48%,meeting the requirements of first grade iron concentrate,and the recovery rate was 97.85%. At the same time,the content of impurity TiO2 in iron concentrate could be reduced by 1.04 percentage points. X-ray diffraction analysis and mineralogy characteristics analysis of the titanium-containing concentrate revealed that titanium in the high ferrotitanium concentrate was mainly present?ed in titanomagnetite. The impurities ilmenite and titanium-hematite could be removed from the high ferrotitanium concentrate by fine/ultrafine grinding-low intensity magnetic separation process. However,titanomagnetite and magnetite belong to the same kind of similarity,and their physicochemical properties are very similar,which is difficult to separate by magnetic sepa?ration. This is the reason why the titanium element of the iron concentrate was difficult to remove significantly. The research re?sults show that the titanium in such kind of high-titanium iron concentrate cannot be removed by beneficiation,but its quality is pretty good and it is very suitable for use as ingredients in other low-titanium iron concentrates.
引文
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[2]Pirajno F.Direct Links:Magmatic Ore Deposits-Fundamental Features and Concepts[M].Dordrecht:Springer,2000:323-234.
[3]王岩,邢树文,张增杰,等.我国查明低品位铁矿资源储量分析[J].矿产综合利用,2014(5):15.Wang Yan,Xing Shuwen,Zhang Zengjie,et al.Reserves analysis of identified low-grade iron resources in China[J].Multipurpose Utilization of Mineral Resources,2014(5):15.
[4]李金朋,吕小焕,张斌,等.不同磨矿形式对柏泉铁矿石铁、磷选别效果的影响试验[J].现代矿业,2016(2):235.Li Jinpeng,Lyu Xiaohuan,Zhang Bin,et al.Effect of different grinding forms on the selectivity of iron and phosphorus in Baiquan iron ore[J].Modern Mining,2016(2):235.
[5]王树立.浅谈中、高钛物料高炉炼铁技术[J].技术与市场,2009,16(2):18.Wang Shuli.Blast furnace ironmaking technology with medium and high titanium material[J].Technology and Market,2009,16(2):18.
[6]Dehghan Manshadi A,Manuel J,Hapugoda S,et al.Sintering characteristics of titanium containing iron ores[J].ISIJ International,2014,54(10):2189.
[7]Yoshikawa T,Morita K.Influence of alloying elements on the thermodynamic properties of titanium in molten steel[J].Metallurgical and Materials Transactions B,2007,38(4):671.
[8]Feng C,Chu M S,Tang J,et al.Effects of MgO and TiO2on the viscous behaviors and phase compositions of titanium-bearing slag[J].International Journal of Minerals,Metallurgy and Materials,2016,23(8):868.
[9]宋建成.高炉含钛物料护炉技术[M].北京:冶金工业出版社,1994:56-59.Song Jiancheng.Protection Technology of Blast Furnace with Titanium Material[M].Beijing:Metallurgical Industry Press,1994:56-59.
[10]Bunin K P,Lev I E,Repin A K.Effect of titanium on graphitizing of white cast iron[J].Metal Science and Heat Treatment,1968,10(5):371.
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