在热力学分析的基础上,通过对氧化钙-氧化硅体系进行灰锥实验确定最佳酸度值,并以此值为标准,分别对氧化钙-硅石、氧化钙-钾长石体系进行TG-DSC分析.研究不同体系反应发生温度及变化特征,并对相应温度下的体系焙烧产物进行XRD分析,进而探明钾长石替换硅石用于电炉法黄磷生产节能降耗机理,并对实际配料体系进行了实验验证.研究结果表明:用钾长石替换硅石作助熔剂,钾长石释放SiO2后的产物与体系反应的硅、铝酸钙盐形成熔点更低的低共熔物.与实际体系对比研究表明:利用钾长石替换硅石作助剂,可降低电炉操作温度100oC以上,节能效果明显,对降低电炉法黄磷生产成本、增强市场竞争优势具有一定的实际意义.%The optimal acidity value was obtained through ash cone experiments on calcium oxide-silicon oxide systems via thermodynamic analysis, and thermo-gravimetric and differential scanning calorimetry (TG-DSC) analysis on CaO-silica and CaO-potassium feldspar systems was performed under the optimum acidity value conditions. Reaction temperatures and processes of different systems were investigated. Moreover, calcined products obtained under corresponding temperatures were analyzed by XRD to study energy saving mechanism during yellow phosphorus production in electric furnace (EAF) using potash feldspar to replace silica. Furthermore, real batching systems were verified by experiments. The results indicate that when silica is replaced by potassium feldspar as flux, the reaction products of potassium feldspar (without SiO2) can react with silicon and calcium aluminate to form an eutectic mixture with lower melting point. Operating temperature of EAF can be reduced by more than 100oC when using potassium feldspar to replace silica with significant energy saving effects, which helps reducing the production cost of yellow phosphorus and enhancing market competitiveness.
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