碳对含钛高炉渣钠化反应热力学及钠化率的影响
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摘要
为高效回收含钛高炉渣中钛元素,探索含钛高炉渣综合利用的新工艺。通过热力学计算分析了含钛高炉渣钠化可行性,热力学计算结果表明,在高于碳酸钠熔点1 124 K低于1 423 K的温度范围内进行含钛高炉渣的钠化反应是可行的。采用渣碱共熔法对含钛高炉渣进行钠化试验研究,结果表明,碳可以促进含钛高炉渣的钠化,随着配碳量的增加,含钛高炉渣的钠化率增加,在含钛高炉渣粒径d0为0.075 mm、反应温度为1 423 K、反应时间为2 h的条件下,当配碳量为nC∶nNa_2CO_3=2∶1时,含钛高炉渣的钠化率达到78%并维持稳定状态。
In order to recycle titanium fromtitanium-bearing blast furnace slag with high efficiency,a new process for comprehensive utilization of titanium-bearing blast furnace slag is explored.Sodium modification feasibility of titanium-bearing blast furnace slag is analyzed through thermodynamic calculation.According to the result of thermodynamic calculation,the feasibility of sodium modification reaction of titanium-bearing blast furnace slag is indicated under temperature of 1 423 K when the melting point of sodium carbonate is higher than 1 124 K.The empirical study on sodium modification of titanium-bearing blast furnace slag is carried out through congruent melting of phosphorous slag.According to the results,carbon can facilitate the sodium modification of titanium-bearing blast furnace slag.Along with the increase of carbon content,the sodium rate of titanium-bearing blast furnace slag increases.When the titanium-bearing blast furnace slag particle size d0 is 0.075 mm and the carbon content reaches nC∶nNa_2CO_3=2∶1,under the conditions of 1 423 K holding 2 h,the sodium rate of titanium-bearing blast furnace slag will reach 78% and maintain a stable state.
In order to recycle titanium fromtitanium-bearing blast furnace slag with high efficiency,a new process for comprehensive utilization of titanium-bearing blast furnace slag is explored.Sodium modification feasibility of titanium-bearing blast furnace slag is analyzed through thermodynamic calculation.According to the result of thermodynamic calculation,the feasibility of sodium modification reaction of titanium-bearing blast furnace slag is indicated under temperature of 1 423 K when the melting point of sodium carbonate is higher than 1 124 K.The empirical study on sodium modification of titanium-bearing blast furnace slag is carried out through congruent melting of phosphorous slag.According to the results,carbon can facilitate the sodium modification of titanium-bearing blast furnace slag.Along with the increase of carbon content,the sodium rate of titanium-bearing blast furnace slag increases.When the titanium-bearing blast furnace slag particle size d0 is 0.075 mm and the carbon content reaches nC∶nNa_2CO_3=2∶1,under the conditions of 1 423 K holding 2 h,the sodium rate of titanium-bearing blast furnace slag will reach 78% and maintain a stable state.
引文
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[6]李要辉,杨志远,王晋珍,等.高钛高炉渣制备微晶石材的体系设计及制备研究[J].钢铁钒钛,2016,37(1):72.(LI Yaohui,YANG Zhi-yuan,WANG Jin-zhen,et al.System design and preparation of glass-ceramics using titanium blast furnace slag[J].Iron Steel Vandium Titanium,2016,37(1):72.)
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