December 2019
Volume 71    Issue 12

Separation of Fe and Mn from manganiferous iron ores via reductive acid leaching followed by magnetic separation

Top, Soner

ABSTRACT:

In this study, a process to separate manganese and iron from manganiferous iron ores by reductive acid leaching followed by magnetic separation was conceived and experimentally tested. In the leaching process, sulfuric acid was used as lixiviant and oxalic acid was used as reductant. The experimental results showed that the manganese and iron separation was optimal when the concentrations of the sulfuric acid and oxalic acid were 0.75 M and 30 g/L, respectively, at a temperature of 80 °C, a solid/liquid ratio of 67 g/L, stirring speed of 400 rpm and leaching duration of 60 min. Under these conditions, 90.49 percent and 6.78 percent of Mn and Fe were dissolved, respectively, from the ore sample in a size fraction of smaller than 106 µm. It was determined that the leaching of manganese from the ores was a second-order reaction with activation energy, Ea, of 53.38 kJ/mol. The leaching residues obtained under the optimal conditions were subjected to wet high-intensity magnetic separation tests to recover the remaining iron content. This separation process produced a concentrate containing 56.20 percent Fe and 1.79 percent Mn with iron and manganese recoveries of 56.83 and 66.73 percent, respectively. To the best of our knowledge, this is the first time that a magnetic separation process was used on a residue obtained from the reductive acid leaching of manganiferous iron ores to recover iron.

HOW CAN YOU READ THE FULL TEXT OF MME PAPERS?

Follow these easy steps if you are an SME member:
  • Go to www.smenet.org/login . Sign in with your email address and password.
  • Hover your mouse over “Publications and Resources” in the top banner. Click on “Mining, Metallurgy & Exploration (MME) Journal” in the pull-down menu.
  • Scroll down and click on the “Read the MME Journal Online” button, which will take you to the Springer site as an SME member who is eligible for free access. (To see published papers on the Springer site, click on “Browse Volumes & Issues” in the blue banner.)
If you are not an SME member, go to https://www.springer.com/engineering/journal/42461 for paid access. Or join SME at www.smenet.org/join