文献类型：期刊文献

英文题名：Influence of slag temperature on phosphorus enrichment in P-bearing steelmaking slag

作者：Lin, Lu Liu, Ya-Qin Zhi, Jian-Guo He, Sai Li, Xiang Hou, Zhong-Xiao Zhang, Li-Qiang

第一作者：Lin, Lu

通信作者：Lin, L[1]

机构：[1]Cent Iron & Steel Res Inst, Met Technol Inst, Beijing 100081, Peoples R China;[2]Baotou Iron & Steel Grp Co Ltd, Inner Mongolia, Peoples R China;[3]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang, Guizhou, Peoples R China;[4]Anhui Univ Technol, Key Lab Met Emiss Reduct & Resources Recycling, Minist Educ, Maanshan, Peoples R China

第一机构：Cent Iron & Steel Res Inst, Met Technol Inst, Beijing 100081, Peoples R China

通信机构：corresponding author), Cent Iron & Steel Res Inst, Met Technol Inst, Beijing 100081, Peoples R China.

年份：2021

卷号：48

期号：3

起止页码：334-342

外文期刊名：IRONMAKING & STEELMAKING

收录：;EI(收录号：20202708901386);Scopus(收录号：2-s2.0-85087369982);WOS:【SCI-EXPANDED(收录号:WOS:000549306200001)】；

基金：This work was supported by the National Natural Science Foundation of China: [Grant Number 51704080]; the National Natural Science Foundation of China: [Grant Number 51874102]; the State Key Laboratory of Refractories and Metallurgy Foundation: [Grant Number G201804]; Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education Foundation: [Grant Number KF17-01]; Foundation for the Author of National Excellent Doctoral Dissertation of the People's Republic of China (CN): [Grant Number 51704085].

语种：英文

外文关键词：P-bearing steelmaking slag; solid solution; temperature control; enrichment; dynamics

摘要：To effectively recycle the phosphorus in P-bearing steelmaking slag and use it as slag phosphate fertilizer, it is necessary to study the effect of slag temperature on occurrence forms and enrichment behaviour of phosphorus in P-bearing steelmaking slag. In this work, the thermodynamic and kinetic behaviours of the formation of phosphorus-rich phases are systematically investigated. The results show that decreasing of the slag temperature (1473-1823 K) has a little effect on the thermodynamic trend of the formation of the 2CaO center dot SiO2 phase (denoted as C2S) and on the early precipitation of the n2CaO center dot SiO2-3CaO center dot P2O5 solid solution (denoted as n C2S-C3P). Additionally, the precipitation of C2S first increases and then decreases, and reaches a maximum value between 1623 and 1653 K. Moreover, the diffusion of phosphorus is a rate-limiting link in the process. The kinetic equation that describes the variation of P2O5 content with time in the phosphorus-rich phase is [%P2O5](SS)/[%P2O5](0) = -2.11472e(-t/51.04047) + 3.04849. The composition of the P-bearing steelmaking slag is in the dicalcium silicate (C2S) primary zone. Controlling the hold temperature and time, and the cooling rate of the P-bearing slag, allows for high-concentration phosphorus enrichment and for the increase of particle size in the n C2S-C3P solid solution. Also, when controlling the aforementioned parameters, the phosphorus partition ratio between the phosphorus-rich and matrix phases (L-p') increases from 1.1-1.5 to 60-130, and the morphology of the former changes from acicular to fine bar to roughing bar. Furthermore, the P2O5 content in phosphorus-rich phase is 31%-33% in enriched slag, meeting the requirements for phosphate fertilizer production.