High-Efficiency Stepped Separation and Recoveries of Vanadium and Molybdenum via Low-Temperature Carbonation Conversion of High-Chromium Vanadium Residue

High-chromium vanadium residue (HCVR (HCVR: high-chromium residue)) is an important secondary resource of valuable metals such as (V), chromium (Cr), and molybdenum (Mo). The mainstream technology for the utilization HCVR, Na2CO3-assisted-roasting–water-leaching method, usually requires roasting temperatures more than 800 °C results in synchronous leaching Cr with V Mo. This makes subsequent separation V, Mo, aqueous system difficult. In this study, efficient clean process selective stepped recoveries Mo from HCVR proposed via K2CO3-mediated carbonation conversion. Using process, temperature can be reduced to 200 °C, 83.14%, 99.94%, 0.33% Cr, respectively, leached. Further, using weakly alkaline ammonium-salt sulfide precipitation methods, 98.28% pure V2O5 98.65% MoS2 obtained reach 82.47% 98.88%, respectively. While almost all recovered some might present a stable ferrochrome spinel tailing, which may returned main extraction slag. Thus, K2CO3 effective alternative Na2CO3 recovery and, hence, enable its utilization.