Thermodynamic Calculations and Kinetics Study on Direct Alloying Process of Abandoned Denitration Catalyst
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摘要: 运用热力学软件Factsage 7.1计算了废弃脱硝催化剂直接合金化过程中还原温度以及TiO2-CaO-CaF2-Na2O-SiO2渣系中配铝量对还原效果的影响。还原温度1 550℃后钢中单质钛不再升高，但钛氧化物的含量随温度升高而持续升高；在1 600℃，钢中Ti含量随着配铝量增加而增加，铝渣比0.4左右时，钛含量可以达到最大值4.25%。铝还原废弃脱硝催化剂的反应在923℃左右发生，属于液—固反应。利用Freeman-Carroll法计算了废弃脱硝催化剂直接合金化还原过程的动力学参数，得出表观活化能E=243.33 kJ/mol，反应级数n=0.13。
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关键词:
- 废弃脱硝催化剂 /
- TiO2 /
- 直接合金化 /
- Factsage7.1 /
- 热力学 /
- 动力学 /
- Freeman-Carroll法
Abstract: The thermodynamic software Factsage 7.1 was used to calculate the effects of reduction temperature and aluminum amount of the TiO2-CaO-CaF2-Na2O-SiO2 slag system during the direct alloying process of the abandoned denitration catalyst.When the reduction temperature reaches 1 550 ℃,titanium in the steel almost no longer rises,but the content of titanium oxides continues to increase with the increase of temperature.At 1 600 ℃,titanium content in the steel increases with increase of the amount of aluminum.When the ratio of aluminum to slag is about 0.4,the titanium content can reach to maximum 4.25%.The reaction for reduction of the abandoned denitration catalyst by aluminum occurs at around 923 ℃ and belongs to a liquid-solid reaction.The kinetics parameters of the direct alloying reduction process were calculated by Freeman-Carroll method,with the obtained apparent activation energy E=243.33 kJ/mol and the reaction order n=0.13.-
Key words:
- abandoned denitration catalyst /
- TiO2 /
- direct alloying process /
- Factsage 7.1 /
- thermodynamics /
- kinetics /
- Freeman-Carroll method
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