Huafang Yu

Tohoku University | Tohokudai · Department of Metallurgy

PhosphorusPhosphorus is an important element for both the agricultural and industrial sectors, especially within semiconductor and pharmaceutical industries. However, the resource of phosphorusPhosphorus, and high grade phosphatePhosphate rock deposits are rapidly being depleted and finding phosphorus secondary resources turns to be more and more c...

Phosphorus is essential for agriculture and industry and is a non-renewable resource. In spite of such importance of the resource, high-grade phosphate rock deposits are rapidly being depleted and claim that economically available deposits may be exhausted entirely within a century. Therefore, finding alternative phosphorus resources is urgent for...

Steelmaking slag is considered an attractive phosphorus secondary resource since it contains relatively high phosphorus content and a fairly fixed composition with the negligibly small hazardous element. The carbothermic reductions of CaO–SiO2–FeO–P2O5 slags were carried out to investigate the reduction behavior of phosphorus from steelmaking slags...

Phosphorous is an essential element for agriculture and industry and is a non-renewable resource. Especially yellow phosphorusYellow phosphorus is a critical material for advanced industrial technology, but phosphorus resources were not produced in Japan, and all depend on imports. It has been suggested, however, that the remaining accessible reser...

Iron droplet that entrapped in the refining slag reduces the yield of iron, so it is necessary to accurately estimate the settling rate of iron particle in the slag. However, since slag is a solid-liquid coexisting fluid, the sedimentation rate of iron particle cannot be derived even using the Stokes’ equation based on the viscosity of the liquid p...

Steelmaking slag is considered as a promising phosphorus resource as it contains the phosphorus in a condensed phase of Ca2SiO4–Ca3P2O8 solid solution (C2S–C3P)ss. In the present study, the carbothermic reduction of (C2S–40 mol% C3P)ss at 1573 K was carried out to understand the phosphorus removal mechanism by varying reduction temperature, externa...

The crystallography of the Ca2SiO4-Ca3P2O8 solid solutions in the dephosphorization slag in current steelmaking process was determined in this study. Understanding the physical and chemical properties of these Ca2SiO4-Ca3P2O8 solid solutions is a preliminary step towards understanding the role of the Ca2SiO4-Ca3P2O8 solid solutions in the dephospho...

The potential feasibility of steel slag as a low cost removal agent for heavy metal ions Pb(II), Cu(II) and Cd(II) in acidic conditions was investigated in this study. The initial pH effect on heavy metal ion removal efficiency, the compounds formed after heavy metal ion removal, and the binding force of metals with the compounds were determined. T...