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Effect of Na_2O on Phosphorus Enrichment and Separation in P-Bearing Steelmaking Slag

机译：Na_2O对P型炼钢渣中磷富集分离的影响

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摘要

In order to recycle the phosphorus in P-bearing converter slag and make it used as slag phosphate fertilizer, the effect of Na_2O in P-bearing steelmaking slag on phosphorus existence form, P_2O_5 solubility and magnetic separation behavior was researched systematically. The results show that the melting point of slag decreases obviously with the increasing of Na_2O content in slag, and high phosphorus solid solution (Ca_2SiO_4-Ca_3(PO_4)_2 and Na_2Ca_4(PO_4)_2SiO_4) are generated by the continuous reaction of 6Ca_2SiO_4-Ca_3(PO_4)_2 (for short 6C_2S-C_3P) solid solution precipitated in the slag with Na_2O under the condition of 1 623 K. The early precipitated 6C_2S-C_3P solid solution is reduced with the increasing content of Na_2O even disappeared. If the addition of Na_2O is increased or excess in the slag, the high phosphorus solid solution (Na_2Ca_4(PO_4)_2SiO_4) that generated by the above mentioned reaction will continue to react with Na_2O to produce Na_3PO_4, then the phosphorus content in the phosphorus-rich phase is heightened. Na_2Ca_4(PO_4)_2SiO_4 and Na_3PO_4 have almost same good citric acid solubility with 6C_2S-C_3P solid solution. Therefore, adding appropriate Na_2O content into slag can improve the slag P_2O_5 solubility, but the effect of different amounts of Na_2O on the P_2O_5 solubility has little difference. Meanwhile, Added Na_2O into slag can improve the metallization of slag and magnetism of iron-rich phase, make the magnetic substances content increased and separation of phosphorus and iron is incomplete, so it is adverse to phosphorus resources recovery from P-bearing slag by magnetic separation method. In order to recycle the phosphorus in P-bearing converter slag, adding appropriate Na_2O content (＜6%) into slag can be used as a flux to instead of fluorite for slag forming in steelmaking process.
机译：为了回收含磷转炉渣中的磷并用作磷肥，对含磷炼钢渣中Na_2O对磷的存在形态，P_2O_5溶解度和磁选行为的影响进行了研究。结果表明，炉渣的熔点随炉渣中Na_2O含量的增加而明显降低，通过6Ca_2SiO_4-Ca_3的连续反应生成高磷固溶体（Ca_2SiO_4-Ca_3（PO_4）_2和Na_2Ca_4（PO_4）_2SiO_4）。在Na 2 O为1 623 K的条件下，（PO_4）_2（简称6C_2S-C_3P）固溶体在渣中析出。随着Na_2O含量的增加，早期析出的6C_2S-C_3P固溶体减少。如果炉渣中Na_2O的添加增加或过量，则上述反应生成的高磷固溶体（Na_2Ca_4（PO_4）_2SiO_4）将继续与Na_2O反应生成Na_3PO_4，则磷中的磷含量丰富的阶段被增强。 Na_2Ca_4（PO_4）_2SiO_4和Na_3PO_4与6C_2S-C_3P固溶体具有几乎相同的良好柠檬酸溶解度。因此，向炉渣中添加适当的Na_2O含量可以提高炉渣P_2O_5的溶解度，但是不同量的Na_2O对P_2O_5溶解度的影响几乎没有差别。同时，向渣中添加Na_2O可以改善渣的金属化和富铁相的磁性，使磁性物质含量增加，磷和铁的分离不完全，不利于通过磁法从含磷渣中回收磷资源。分离方法。为了使含磷转炉渣中的磷再循环，可以在炉渣中添加适量的Na_2O（＜6％）作为熔剂，代替萤石在炼钢过程中形成炉渣。

著录项

  • 来源
    《ISIJ international》 |2015年第3期|552-558|共7页
  • 作者

    Lu LIN; Yan-ping BAO; Wei JIANG; Qi-fan WU;

  • 作者单位

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian, Beijing, 100083 China ,National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian, Beijing, 100083 China;

    Journals Publishing Center, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian, Beijing, 100083 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    P-bearing slag; P_2O_5 solubility; melting modification; enrichment and separation; resource utilization; slag phosphate fertilizer;

    机译：含磷渣;P_2O_5溶解度;熔融改性浓缩和分离;资源利用率;矿渣磷肥;

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