摘要:
通过扫描量热法(DSC)和粉末X射线衍射(XRD),研究了几种不同纯矿物与Ca3TiFe2O8混合的烧结过程,检测液相生成及吸放热反应前后的物相组成。结果表明,在烧结过程中,与Ca3TiFe2O8混合试样液相出现温度都比纯相的熔点低。其中,等质量混匀烧结过程中,Ca3TiFe2O8+CaFe2O4和Ca3TiFe2O8+Fe2O3分别在1 213℃和1 215℃开始出现液相,Ca3TiFe2O8+CFA和Ca3TiFe2O8+SFC则更低,分别在1 204℃、1 205℃开始出现液相。试验发现,Ca3TiFe2O8和CaFe2O4可以稳定共存,但与Fe2O3、CFA和SFC混合出现液相后会发生分解,它仅是一个中间产物。尽管如此,可以认为适当控制含钛铁矿石的烧结条件,有Ca3TiFe2O8生成,可以降低液相生成温度,有助于改善烧结过程中的扩散条件。
Abstract:
The different minerals were mixed with titanium-containing calcium ferrite Ca3TiFe2O8 to study the melting temperature and mineral composition in sintering process of titaniferous iron ore by DSC and XRD methods.Results showed that the melting temperature of samples was lower than that of the each individual mineral in the sintering process,i.e.that of the Ca3TiFe2O8+CaFe2O4,the Ca3TiFe2O8+Fe2O3,the Ca3TiFe2O8+CFA and the Ca3TiFe2O8+SFC were 1 213 ℃,1 215 ℃,1 204 ℃ and 1 205 ℃ respectively.In addition,it was found out that Ca3TiFe2O8 existed simultaneous with CaFe2O4,but was decomposed when it existed together with Fe2O3,CFA,and SFC,so it was considered as a intermediate product.Nevertheless,the sintering conditions of titanium-containing iron ore could be properly controlled to obtain the Ca3TiFe2O8 that was conductive to the liquid phase formation for improving the diffusion condition during sintering process of iron ore fines.
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