An Effective Way to Extract Cr from Cr-Containing Tailings

The high-chromium vanadium slag is treated by magnesium roasting-acid leaching to obtain Cr-containing tailings, which are not the solid waste but important valuable resources for various fields. In order to extract Cr from these tailings, sodium carbonate as annexing agent mixed tailings was roasted and then leached by water. There are several factors that were investigated including roasting temperature, roasting time, the molar ratio of Na/(V+Cr), leaching time, leaching temperature, and the ratio of L/S. The Cr-containing tailings before and after roasting and the residue after leaching were characterized by XRD. It is indicated that Cr in tailings was all entered into leaching solution due to residue not found Cr-containing phase. Under the optimal conditions, the maximum leaching rate of Cr was 92.49%.

Automated summary

The high-chromium vanadium slag is treated by magnesium roasting-acid leaching to obtain Cr-containing tailings, which are valuable resources. Sodium carbonate as annexing agent mixed tailings for roasting, resulting in a maximum leaching rate of Cr of 92.49% under optimal conditions.