HYDROMETALLURGICAL EXTRACTION AND PRODUCTION OF MANGANESE DIOXIDE FROM KA’OJE (NIGERIA) MANGANESE ORE

R. A. Muriana, O. K. Abukakre, E. Muzenda, S. Ndlovu, A. Y. Yusuf, A. S. Abdulkareem

Abstract


B

attery-grade Manganese Dioxide (MD) was synthesised from Ka’oje manganese ore using hydrometallurgical extraction and thermal decomposition methods. Manganese from pre-reduced ore samples was leached out using dilute nitric acid as leachant. Effects of the acid concentration and temperature on leaching efficiency were investigated after which the eluate was purified using aqueous NaOH as the precipitation agent. The purified and crystallized manganese nitrate was thermally decomposed at 130 oC to synthesize the MD. The result showed that synthetic manganese dioxide with purity of 87.9 % was achieved. The MD was utilized in building Alkaline cell (Zn/NaOH/MnO2) to establish its activeness. The constructed electrochemical battery had the produced MD as the cathode active material. The battery actively discharged upon loading (1 KΩ and 2 KΩ resistors) for 120 s after which the current stabilized. The voltage discharge was from 1.9 V to 0.21 V in 720 s. The battery practically re-energized itself back to initial state when unloaded. The results showed that the produced MD is a suitable active material in production of MnO2 based batteries. 

Keywords: Electrochemical batteries, Manganese ore, hydrometallurgical extraction

 


Full Text:

PDF

Refbacks

  • There are currently no refbacks.


Copyright (c) 2017 Journal of Raw Materials Research

©2017 Raw Materials Research and Development Council