Study on the high-efficiency separation of Fe in extracted vanadium residue by sulfuric acid roasting and the solidification behavior of V and Cr

The large accumulation of extracted vanadium residue not only causes waste of resources but also causes environmental pollution. In this work, 96.8% Fe in extracted vanadium residue is efficiently and selectively leached by sulfuric acid roasting process at a lower temperature. Petroleum proppant is prepared from iron removal waste slag and low-grade bauxite, and V and Cr in extracted vanadium residue are solidified. Specifically, under the conditions of reaction temperature of 95 degrees C, pH of 2.5, and time of 6 h, 86.8% of Fe in the ironrich leaching solution is converted into flower-like ammonium jarosite. After the thermal decomposition of ammonium jarosite, the product Fe2O3 still has a flower-like morphology. The microstructure of the petroleum proppant is that corundum crystals are filled in the gaps of the network structure of the mullite columnar crystals to form a staggered skeleton structure, which combines the advantages of two-phase materials. The total recovery rates of V and Cr in extracted vanadium residue are 93.74% V and 98.18% Cr, respectively. This study provided a cleaner production approach to recycle industrial waste, reduce the hazards of V and Cr, and reduce the cost of preparing alpha-Al2O3-3Al(2)O(3)center dot 2SiO(2) dual-phase structure petroleum proppants.

Automated summary

In this study, a sulfuric acid roasting process efficiently leached out 96.8% of Fe in extracted vanadium residue, while also solidifying V and Cr. The prepared petroleum proppant combines advantages of two-phase materials, with total recovery rates of 93.74% V and 98.18% Cr, offering a cleaner production approach and reducing the cost of preparing dual-phase structure petroleum proppants.