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参照实际转炉脱磷炉渣,配制了不同F、P2O5、FeO和MgO含量及碱度的渣样,用化学分析方法测试了不同组分对渣中磷的枸溶率的影响规律.结果表明:当脱磷渣中含有F时,P主要与F形成氟磷灰石,使得磷的枸溶率随渣中F含量的升高而急剧降低,当不含氟时枸溶率可达92.5%,当氟质量分数达到0.5%时枸溶率已降低到50%以下;随碱度增加,由于渣中Ca2+含量增加,破坏了硅氧网络结构,使得枸溶率有所上升;渣中MgO含量升高,由于Mg2+在熔融冷却过程中会抑制β--Ca3(PO4)2晶体的析出,而β--Ca3(PO4)2中磷不易为质量分数为2%的柠檬酸液溶出,而使枸溶率有所升高;随渣中P2O5含量升高,由于P5+与O2-形成络离子,P5+位于O2-密集形成的间隙中,不易溶出,使得枸溶率有所下降;渣中FeOn升高,枸溶率随之降低.
With reference to the actual converter dephosphorization slag, slag samples with different content of F, P2O5, FeO and MgO and basicity were prepared, and the influence of different components on the content of phosphorus in slag was tested by chemical analysis method.The results showed that when When F is contained in the dephosphorized slag, P forms Fluoride apatite mainly with F, so that the Citrate solubility rate of Phosphorus decreases sharply with the increase of F content in the slag. When F is not contained, the Citrate solubility rate reaches 92.5% With the increase of alkalinity, the content of Ca2 + in the slag increased, destroying the structure of silicon and oxygen network and the content of citronellolysis increased. The content of MgO in the slag increased Since Mg2 + inhibits the precipitation of β - Ca3 (PO4) 2 during the melt - cooling process, phosphorus in β - Ca3 (PO4) 2 is not easily dissolved in the citric acid solution with a mass fraction of 2% With the increase of P2O5 content in the dregs, P5 + forms a complex ion with O2-, P5 + is located in the densely formed gap of O2-, which makes it difficult to dissolve, Citroneral dissolution rate decreases.