公开(公告)号：US20220356543A1

公开(公告)日：2022-11-10

申请号：US17740091

申请日：2022-06-30

Applicant: University of Science and Technology Beijing

Inventor： Baijun YAN ,  Zihui DONG ,  Jie ZHANG

IPC: C22B7/04 ,  C22B7/00 ,  C22B34/32 ,  C22B34/22 ,  C22B34/12

Abstract: The present disclosure provides a method for co-extraction of vanadium, titanium and chromium from vanadium slag. The method selectively reduces pyroxene and fayalite wrapped on spinel through low-temperature hydrogen reduction, iron removal by ferric chloride, and low-temperature leaching of the vanadium slag by oxalic acid, thereby destroying a structure of the spinel, dissociating a spinel phase and a silicate phase, and fully exposing the spinel phase. The method also directly leaches the vanadium slag at a low temperature by acidity and strong complexation of the oxalic acid, and destroys the structure of the spinel, such that vanadium, titanium, chromium and oxalate are complexed into a solution to co-extract vanadium, titanium and chromium. The present disclosure extracts vanadium, titanium and chromium from the vanadium slag, with a leaching rate each being greater than 99%.