The Effects of Different P2O5 Content and Basicity on Phosphorus Enrichment in the CaO-SiO2-FetO-P2O5 Slag System

Abstract

To improve the additional value of phosphorusenrichment phase in slag, it is necessary to make phosphorus to be enriched in the slag. This paper elaborates the effects of different P 2 O 5 content and basicity on phosphorus enrichment in the CaO-SiO 2 -Fe t O-P 2 O 5 slag system through the experiment. Slag morphology can be observed by SEM+EDS and the composition of the phase can be ascertained by XRD. Then Lp and Cp in both phosphorus-enrichment phase and matrix phase were calculated respectively. It has been found that P 2 O 5 content in the slag and the basicity of the slag have effects on the existing form of the phosphorus in the slag, and also influence the distribution ratio of P 2 O 5 in the slag.

Influence of phase distribution of converter slag microzones on the occurrence of P

“…The atomic number of the major elements in the slag is in turn Fe, Ca, Si, Mg, and O. Hence, the color of the phase can reflect its chemical composition [8][9][10]. According to Figure 1, the type of steel slag is divided into three types: black, gray, and off-white.…”

“…However, when the content of CaO is higher than a certain value, the increase of CaO will result in a decrease in the FeO mole fraction. However, the addition of CaO content increases the FeO activity coefficient [10]. But, the combined effect of two is the decrease in a FeO .…”