Form of phosphate enrichment of the CaO base containing V2O5 and TiO2 semi-steel slag
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摘要: 以Ca O基含V2O5、Ti O2脱磷终渣为研究对象, 采用共存理论建立磷富集程度Rci-cj模型, 并与实际渣系的磷酸盐赋存形式进行对比研究.结果表明:随着碱度的增加, 3CaO·P2O5的质量作用浓度逐渐降低, 4CaO·P2O5的质量作用浓度逐渐增加, 而2CaO·Si O2的质量作用浓度呈现出先增加后降低的趋势;C3P+C4P的富集可能性范围87%94%, C2S既是主要的硅酸钙化合物也是形成富磷产物必不可少的物质, 磷酸盐富集相中主要以C2S-C3P和C2S-C4P的形式存在于炉渣中, 结合扫描电镜 (SEM) 结果、X射线衍射 (XRD) 分析与假设, 计算可得深灰色富磷区域内的含P2O5固溶体为2CaO·Si O2-3CaO·P2O5和2CaO·Si O2-4CaO·P2O5, 此结果与理论计算相吻合.Abstract: Studying on the Ca O base containing V2O5and Ti O2semi-steel slag, a model of enrichment degree Rci-cjwas built with the help of the ion and molecule coexistence theory, the result was compared with the actual enrichment form of phosphate.The results indicate that with the increasing of basicity, the mass action concentration of 3CaO·P2O5gradually decreases, and the mass action concentration of 4CaO·P2O5gradually increases.While the mass action concentration of 2CaO·Si O2first increases and then decreases.The enrichment possibility range of the C3P+C4P is 87%-94%and the C2S that is the essential substance for the formation of the rich phosphate mineral phase is main calcium silicate compounds.The solid solution 2CaO-Si O2-3CaO-P2O5 (C2S-C3P) and 2CaO-Si O2-4CaO-P2O5 (C2S-C4P) are the primary phosphate enrichment phase in the slag.According to the scanning electron microscopy (SEM) results, X-ray diffraction (XRD) analysis and hypothesis, the containing P2O5solid solution in dark grey area is calculated as2CaO·Si O2-3CaO·P2O5and 2CaO·Si O2-4CaO·P2O5, which is consistent with the theoretical calculation results.
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