攀枝花钛渣NaOH分解-HCl浸出制备TiO_2的工艺研究
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摘要
以攀枝花钛渣为原料,采用NaOH分解-HCl浸出的方法制备TiO_2。通过XRD射线衍射手段分析钛渣被NaOH分解过程中的物相变化。结果表明:NaOH分解钛渣是分步进行的,即M_3O_5(M=Fe~(2+),Ti~(3+),Ti~(4+))→Fe_3Ti_3O_(10)→Fe_2TiO_5→α-NaFeO_2,Na_2TiO_3。在HCl浸出制备TiO_2的试验中,分析盐酸浓度、加铁量、溶液pH值、沉积温度和沉积时间等因素对最终样品TiO_2含量的影响。通过优化试验,确定最优工艺条件为:沉积温度45℃、沉积时间40 min、盐酸浓度5 mol/L、加铁粉量0.6 g、溶液pH=2。按照最佳条件进行验证试验,所制备样品TiO_2含量达98.36%。
TiO_2 was prepared by a process of NaOH decomposing-HCl leaching with titanium slag from Panzhihua as raw material.The phase transformations of titanium slag during NaOH decomposition were analyzed using XRD.The results suggest that the decomposition of titanium slag by NaOH is a multistage process,viz.M_3O_5(M=Fe~(2+),Ti~(3+),Ti~(4+))→Fe_3Ti_3O_(10) → Fe_2TiO_5 → α-NaFeO_2,Na_2TiO_3.The effects of HCl concentration,amount of Fe additive,solution pH,deposition temperature and time on the content of TiO_2 in the final products were studied during the HCl leaching process.The optimized conditions are determined at HCl concentration of 5 mol/L,Fe addition amount of 0.6 g,deposition time of 40 min,deposition temperature of 45 °C and solution pH=2,with 98.36% of TiO_2 in the final products.
TiO_2 was prepared by a process of NaOH decomposing-HCl leaching with titanium slag from Panzhihua as raw material.The phase transformations of titanium slag during NaOH decomposition were analyzed using XRD.The results suggest that the decomposition of titanium slag by NaOH is a multistage process,viz.M_3O_5(M=Fe~(2+),Ti~(3+),Ti~(4+))→Fe_3Ti_3O_(10) → Fe_2TiO_5 → α-NaFeO_2,Na_2TiO_3.The effects of HCl concentration,amount of Fe additive,solution pH,deposition temperature and time on the content of TiO_2 in the final products were studied during the HCl leaching process.The optimized conditions are determined at HCl concentration of 5 mol/L,Fe addition amount of 0.6 g,deposition time of 40 min,deposition temperature of 45 °C and solution pH=2,with 98.36% of TiO_2 in the final products.
引文
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[3] Chernet T.Applled mineralogical studies on Australian sand ilmenite concentratewith special reference to its behaviour in the sulphate process[J].Minerals Engineering,1999,12(5):485-495.
[4] Richard H W,Gregory J,William H G,et al.First-principles thermochemistry for the production of TiO2 from TiCl4[J].Physical Chemistry,2007,111(18):3560-3567.
[5] Moon J,Hedman H P,Kemell M,et al.A study of monitoring hydrogen using mesoporous TiO2 synthesized by anodization[J].Sensors Actuators B:Chemistry,2013,189:246-254.
[6] Tang Zhengning.Production and environmental control of titanium dioxide[M].Beijing:Chemical Industry Press,2000.(唐振宁.钛白粉的生产与环境治理[M].北京:化学工业出版社,2000.)
[7] Yang Baoxiang.Present situation of direct reduction ironmaking and selection of treatment technology for Panzhihua vanadium titanomagnetite[J].Panzhihua Sci-tech & Information,2010,31(3):4-8.(杨保祥.直接还原炼铁工艺现状及攀枝花钒钛磁铁矿处理工艺选择[J].攀枝花科技与信息,2010,31(3):4-8.)
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