Thermodynamics Study of High-phosphorus Hematite Gasification Dephosphorizing
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摘要: 采用Fact Sage6.4热力学分析软件研究不同条件对高磷赤铁矿中磷平衡组成的影响,并结合试验进行验证。结果表明:不同温度下气态磷的存在形式不同,升高温度有利于气化脱磷;适量的SiO2含量能降低碳热还原氟磷酸钙的开始反应温度,SiO2含量较高时,气化脱磷率受反应生成的硅酸盐熔融物制约;当C含量较低时,磷仍以氟磷酸钙形式存在,当C含量较高时,磷被还原成Fe P形式;Cl2可以和被还原出来的P2反应生成PCl3,温度较低时,脱磷产物为PCl3,温度较高时,脱磷产物先为P2,改变脱磷产物生成PCl3需要更高的Cl2含量。采用综合热分析仪进行试验验证,其结果与热力学分析结果相符。Abstract: The effects of different conditions on the equilibrium species about high-phosphorus hematite were investigated by Fact Sage6.4 thermodynamic analysis software. And some experiments were made to verify the thermodynamic analysis data. The results show that the existence forms of gas phosphorus were different at different temperatures,a rise of temperature enhances the phosphorus removal. The right amount of SiO2 concentration can reduce the onset temperature of carbothermic reduction of fluorine calcium phosphate,when the SiO2 concentration is high,the phosphorus removal were restricted by the produced silicate melts. When the C concentration is low,phosphorus is still contained in the fluorine calcium phosphate,when the C concentration is high,phosphorus is reduced to form FeP. Cl2 can react with P2 to produce PCl3,when the temperature is low,the dephosphorizing product is PCl3,when the temperature is high,the first dephosphorizing product is P2,changes the dephosphorizing product to produce PCl3 need higher concentration of Cl2. Experimental verification was conducted by using simultaneous thermal analyzer,the experiment results are in good agreement with those of the thermodynamic analysis.
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Key words:
- high-phosphorus hematite /
- sinter /
- gasification dephosphorizing /
- thermodynamics
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