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首页> 外文期刊>ISIJ international >Effect of Atmosphere and Slag Composition on the Evolution of PH3 Gas during Cooling of Reducing Dephosphorization Slags
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Effect of Atmosphere and Slag Composition on the Evolution of PH3 Gas during Cooling of Reducing Dephosphorization Slags

机译：降渣渣冷却过程中气氛和炉渣成分对PH 3 气体释放的影响

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摘要

The distribution ratio of phosphorous between the CaO–CaF_(2) (–SiO_(2)) flux and SiMn alloy melts at 1823 K was measured under strongly reducing atmosphere. Furthermore, thermodynamic and kinetics analyses were carried out for the environmental stability of reducing refining slags containing Ca_(3)P_(2) under wet cooling conditions from the effect of slag composition on the evolution of PH_(3) (phosphine) gas. The distribution ratio of phosphorous between the CaO–CaF_(2) (–SiO_(2)) flux and SiMn metal phases increased with increasing CaO concentration in the flux, followed by a constant value. The composition for the saturating distribution ratio of phosphorous was in good accordance to the saturation content of CaO in the CaO–CaF_(2) flux at 1823 K. When the Vee ratio (= CaO/SiO_(2)) of the dephosphorization slag was greater than about 1.35, the lime and dicalcium silicate phases precipitated during solidification, resulting in an increase in the evolution rate of PH_(3) gas under wet and dry conditions due to an increase in the reaction area. However, when the Vee ratio of the slag was lower than about 1.35, fluorite, cuspidine, and wollastonite phases precipitated from the phase diagram, resulting in less amount of PH_(3) evolution during cooling because the reaction between Ca_(3)P_(2) and H_(2)O was restricted to the surface of bulk slag.
机译：在强还原气氛下，测量了1823 K下CaO–CaF_（2）（–SiO_（2））熔剂与SiMn合金熔体之间磷的分布比。此外，从炉渣成分对PH_（3）（磷化氢）气体逸出的影响，在湿冷条件下进行了热力学和动力学分析，以减少含Ca_（3）P_（2）的精炼炉渣的环境稳定性。 CaO–CaF_（2）（–SiO_（2））焊剂和SiMn金属相之间的磷分布比率随着焊剂中CaO浓度的增加而增加，随后为恒定值。磷的饱和分布比的组成与1823 K时CaO–CaF_（2）焊剂中CaO的饱和含量良好一致。当脱磷炉渣的Vee比（= CaO / SiO_（2））为大于约1.35时，在固化过程中沉淀出石灰和硅酸二钙相，由于反应面积的增加，导致在湿和干条件下PH_（3）气体的逸出速率增加。但是，当炉渣的Vee比低于1.35时，萤石，子啶和硅灰石相从相图中沉淀出来，导致冷却过程中PH_（3）析出的量减少，因为Ca_（3）P_（ 2）和H_（2）O被限制在散渣表面。

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