Laboratory assessment of isothermal separation of V containing spinel phase from vanadium slag by centrifugal casting

Abstract

V containing spinel phase was successfully separated from vanadium slag by centrifugal casting. With the process parameters of G5900 (where normal gravity G51), t520 min and T51557 K, almost all V containing spinel phase is enriched in the concentrate, while the tailing is made up of Fe 2 SiO 4 , Fe 2 TiO 4 and Mn 2 VO 4 phases. Under the hypothesis that the vanadium and silicon exist in the slag as V 2 O 3 and SiO 2 , the mass fractions of V 2 O 3 and SiO 2 in the concentrate are 25?2 and 2?2%, while those of the tailing are 0?8 and 32?2% respectively. The recovery ratio of V in the concentrate is up to 97?4%, while the removal ratio of Si is 92?5% by centrifugal separation.

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

“…The morphology of the slag was studied by SEM and EDS. According to previous studies for vanadiumcontaining slags, 3,9,35,36) the white phase was made up of spinel crystals, while the dark phase was the silicate phase as shown in Fig. 1(a).…”

Removal of Tramp Elements within 7075 Alloy by Super-Gravity Aided Rheorefining Method

“…It is indicated that the separation rate of solid/liquid phases has reached the maximum level and the prolonging of separation time dose no good to the separation effect. The gravity coefficient is the crucial factor for separation effect compared to separation time [23,25]. For the liquid phase, its flow trend under super-gravity field equals to the viscous resistance when the separation limitation state is reached.…”

“…While in this study, in order to improve the flowability of liquid intermetallic compounds and keep the aluminum matrix in solid state, the separation temperature should be kept a little lower than the melting point of aluminum. Li has used the super-gravity field to separate valuable components from metallurgical slags [23][24][25]. The separation temperature in his study was usually above 1300 • C, which called high requirement on apparatus and experiment operation.…”

Isothermal Enrichment of P-Concentrating Phase from CaO–SiO₂–FeO–MgO–P₂O₅ Melt with Super Gravity

“…Considering the fact that phosphorus in steelmaking slag is mostly enriched in dicalcium silicate precipitating early during solidification and its density is smaller than the residual melt, the P-concentrating phase can be separated by super gravity. In addition, super gravity technology has been successfully applied in the separation and recovery of various valuable elements from different kinds of slags, [17][18][19][20] removing of impurities from alloy melt 21,22) and preparation of functionally gradient materials. [23][24][25][26][27] Based on the characteristics above, it would be possible to separate P-concentrating phase precipitating early from steelmaking slag by super gravity.…”