第36卷第8期 北京科技大学学报 Vol.36 No.8 2014年8月 Journal of University of Science and Technology Beijing Aug.2014 二氧化钛改质对含磷转炉渣中磷富集行为的影响 林 路12)，包燕平)四，王敏)，周寒梅 1)北京科技大学钢铁治金新技术国家重点实验室，北京100083 2)北京科技大学国家板带生产先进装备工程技术研究中心，北京100083 ☒通信作者，E-mail:baoyp@ust山.cdu.cn 摘要为了有效富集含磷转炉渣中磷，通过T0,熔融改质研究了磷富集行为，对T02改质过程进行了热力学探讨，同时对 实验炉渣进行磁选分离提取了富磷相.在1623K条件下，随着渣中Ti02含量的增加，渣中先期析出的n2C0·Si02-3Ca0· P20,(以下简记nC2SC3P)固溶体与TiO2不断反应析出CaSiTiO3、CaTi03和高磷固溶体(nC,S-CP,n'<n),先期析出的 nC,SC,P固溶体会随着TO2含量的增加而逐渐减少甚至消失，如渣中TO2含量进一步增加或过量，前述反应生成的高磷固 溶体(nC2SC,P)继续与TiO2反应，从而使富磷相中磷含量进一步提高.经350mT磁场强度下磁选后，改性后的渣中收集到 的非磁性物较原渣提高了23.84%，P,0,分配比由0.96增加到2.92，分离的非磁性物占炉渣总量的65.43%，渣中74.46%的 磷进入收集的非磁性物中，实现了绝大部分磷元素的回收利用 关键词转炉渣：二氧化钛：改质：磷：废弃物回收利用 分类号TF09:X75 Influence of titania modification on phosphorus enrichment in P-bearing steel- making slag LIN Lu,BAO Yan-ing,WANG Min?,ZHOU Han-mei) 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 2)National Engineering Research Center of Flat Rolling Equipment,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:baoyp@ustb.edu.cn ABSTRACT In order to effectively enrich phosphorus in converter slag,phosphorus enrichment was studied by TiO:modification, the TiO,modification process was discussed according to thermodynamic analysis,and the phosphorus-rich phase was separated from experimental slag by magnetic separation.It is found that CaSiTiOs,CaTiO and high phosphorus solid solution (n'CS-CP)form by a continuous reaction of n2Ca0.SiO-3Ca0.P2Os (nC2S-C:P for short,n >n)solid solution precipitated in the slag and TiO2 at 1623 K.The early precipitated solid solution (nCS-C,P)decreases with the increasing TiOcontent,even disappears.If the addition of Ti increases or is excess in the slag,the high phosphorus solid solution (n'CS-CP)that forms by the above mentioned reaction will continue to react with TiO to produce CaSiTiO and CaTiO,and then phosphorus content in the phosphorus-rich phase increases. Through magnetic separation under a magnetic flied intensity of 350 mT,the amount of collected non-magnetic substance in the slag modified by TiO,increases by 23.84%compared with the original slag,the distribution ratio of P2Os enlarges from 0.96 to 2.92,the amount of separated non-magnetic substance is 65.43%of the total of the modified slag,74.46%of phosphorus in the modified slag is entered into collected non-magnetic substance,and thereby most phosphorus is recycled. KEY WORDS converter slag:titanium dioxide:modification:phosphorus;waste recycling 由于炼钢过程脱磷的需要以及近年来高磷矿的 将钢渣返回治炼系统内部循环利用，则必然会造成 使用，势必造成钢渣中磷含量较高的状况，如简单地 磷在铁液中的循环富集，并最终限制钢渣的再利用； 收稿日期：2013-05-25 DOI:10.13374/j.issn1001-053x.2014.08.004:http:/journals.ustb.edu.cn第 36 卷 第 8 期 2014 年 8 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 8 Aug． 2014 二氧化钛改质对含磷转炉渣中磷富集行为的影响 林 路1，2) ，包燕平1) ，王 敏2) ，周寒梅1) 1) 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083 2) 北京科技大学国家板带生产先进装备工程技术研究中心，北京 100083  通信作者，E-mail: baoyp@ ustb． edu． cn 摘 要 为了有效富集含磷转炉渣中磷，通过 TiO2 熔融改质研究了磷富集行为，对 TiO2 改质过程进行了热力学探讨，同时对 实验炉渣进行磁选分离提取了富磷相． 在 1623 K 条件下，随着渣中 TiO2 含量的增加，渣中先期析出的 n2CaO·SiO2--3CaO· P2O5 ( 以下简记 nC2 S--C3P) 固溶体与 TiO2 不断反应析出 CaSiTiO5、CaTiO3 和高磷固溶体( n'C2 S--C3P，n' ＜ n) ，先期析出的 nC2 S--C3P 固溶体会随着 TiO2 含量的增加而逐渐减少甚至消失，如渣中 TiO2 含量进一步增加或过量，前述反应生成的高磷固 溶体( n'C2 S--C3P) 继续与 TiO2 反应，从而使富磷相中磷含量进一步提高． 经 350 mT 磁场强度下磁选后，改性后的渣中收集到 的非磁性物较原渣提高了 23. 84% ，P2O5 分配比由 0. 96 增加到 2. 92，分离的非磁性物占炉渣总量的 65. 43% ，渣中 74. 46% 的 磷进入收集的非磁性物中，实现了绝大部分磷元素的回收利用． 关键词 转炉渣; 二氧化钛; 改质; 磷; 废弃物回收利用 分类号 TF 09; X 75 Influence of titania modification on phosphorus enrichment in P-bearing steel￾making slag LIN Lu1，2) ，BAO Yan-ping1)  ，WANG Min2) ，ZHOU Han-mei1) 1) State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China 2) National Engineering Ｒesearch Center of Flat Ｒolling Equipment，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: baoyp@ ustb． edu． cn ABSTＲACT In order to effectively enrich phosphorus in converter slag，phosphorus enrichment was studied by TiO2 modification， the TiO2 modification process was discussed according to thermodynamic analysis，and the phosphorus-rich phase was separated from experimental slag by magnetic separation． It is found that CaSiTiO5，CaTiO3 and high phosphorus solid solution ( n'C2 S--C3P) form by a continuous reaction of n2CaO·SiO2--3CaO·P2O5 ( nC2 S--C3P for short，n ＞ n') solid solution precipitated in the slag and TiO2 at 1623 K． The early precipitated solid solution ( nC2 S--C3P) decreases with the increasing TiO2 content，even disappears． If the addition of TiO2 increases or is excess in the slag，the high phosphorus solid solution ( n'C2 S--C3P) that forms by the above mentioned reaction will continue to react with TiO2 to produce CaSiTiO5 and CaTiO3，and then phosphorus content in the phosphorus-rich phase increases． Through magnetic separation under a magnetic flied intensity of 350 mT，the amount of collected non-magnetic substance in the slag modified by TiO2 increases by 23. 84% compared with the original slag，the distribution ratio of P2O5 enlarges from 0. 96 to 2. 92，the amount of separated non-magnetic substance is 65. 43% of the total of the modified slag，74. 46% of phosphorus in the modified slag is entered into collected non-magnetic substance，and thereby most phosphorus is recycled． KEY WOＲDS converter slag; titanium dioxide; modification; phosphorus; waste recycling 收稿日期: 2013--05--25 DOI: 10． 13374 /j． issn1001--053x． 2014． 08． 004; http: / /journals． ustb． edu． cn 由于炼钢过程脱磷的需要以及近年来高磷矿的 使用，势必造成钢渣中磷含量较高的状况，如简单地 将钢渣返回冶炼系统内部循环利用，则必然会造成 磷在铁液中的循环富集，并最终限制钢渣的再利用;