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has been cited by the following article:

• TITLE: Dissolution of Manganese from Polymetallic Material Using Sulfuric-Oxalic Acid Medium

  AUTHORS: Mona N. El Hazek, Azza A. Gabr

  KEYWORDS: Polymetallic Mn Material, Oxalic-Sulfuric Acid, Agitation Dissolution

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.7 No.5, May 19, 2016

  ABSTRACT: Sedimentary rocks have been found to host several Mn minerals in addition to some economic metal values. Besides recoverable Al occurring as gibbsite mineral, the latter include Cu, Zn, Co, Ni, U as well as rare earth elements. In this work, the ore material was subjected to sulfuric acid leaching in the presence of oxalic acid as a reductant to maximize the extraction of Mn. The optimum leaching conditions to achieve almost complete leaching efficiency of Mn with Fe dissolution not exceeding 13% involved 0.5 M sulfuric acid and 0.25 M oxalic acid in a solid/liquid ratio of 1/15 at 85°C for 105 min using an ore size of -150 μm. The leaching behavior of the associated interesting metal values (Al, Cu and Zn) has also been investigated.