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Strategic reforms in hydro-refining units for handling manganese-rich zinc concentrates at HZL.

Authors :
Sombhatla S.S.
European metallurgical conference: EMC 2017 Leipzig, Germany 25-Jun-1728-Jun-17
Kumar A.
Mashruwala S.
Rokkam K.Kr.
Shukla A.
Sombhatla S.S.
European metallurgical conference: EMC 2017 Leipzig, Germany 25-Jun-1728-Jun-17
Kumar A.
Mashruwala S.
Rokkam K.Kr.
Shukla A.
Publication Year :
2017

Abstract

Manganese is frequently found as a naturally associated element with lead-zinc ores. During the processing of Zn concentrates with high Mn content, the selective sulphate leaching of Zn from concentrate is not possible and eventually ends up with extraction of Mn along with other minor impurities in to the zinc leachate. The Mn and Mg levels in zinc hydrorefineries of Hindustan Zinc have increased above acceptable limits. Due to limited capacity of continuously operated Mg Removal (MR) bleeding section, alternative routes for reducing Mn in zinc sulphate solution have been explored. The focus is mainly on using selective oxidants to oxidise and precipitate Mn from Zn leach solution. KMnO4 has been selectively preferred for Mn reduction by taking account of reagent consumption as well as operational lenience. Consumption of MnO2 for oxidising ferrous to ferric ions in the leaching circuit was identified as another source of Mn increase. Sodium persulphate (SPS), a powerful oxidising agent, was explored to replace MnO2 slurry in leaching; SPS has additional advantages in oxidising ferrous to ferric ions along with sodium sulphate production, a prime reagent used for iron precipitation in the form of jarosite.<br />Manganese is frequently found as a naturally associated element with lead-zinc ores. During the processing of Zn concentrates with high Mn content, the selective sulphate leaching of Zn from concentrate is not possible and eventually ends up with extraction of Mn along with other minor impurities in to the zinc leachate. The Mn and Mg levels in zinc hydrorefineries of Hindustan Zinc have increased above acceptable limits. Due to limited capacity of continuously operated Mg Removal (MR) bleeding section, alternative routes for reducing Mn in zinc sulphate solution have been explored. The focus is mainly on using selective oxidants to oxidise and precipitate Mn from Zn leach solution. KMnO4 has been selectively preferred for Mn reduction by taking account of reagent consumption as well as operational lenience. Consumption of MnO2 for oxidising ferrous to ferric ions in the leaching circuit was identified as another source of Mn increase. Sodium persulphate (SPS), a powerful oxidising agent, was explored to replace MnO2 slurry in leaching; SPS has additional advantages in oxidising ferrous to ferric ions along with sodium sulphate production, a prime reagent used for iron precipitation in the form of jarosite.

Details

Database :
OAIster
Notes :
und
Publication Type :
Electronic Resource
Accession number :
edsoai.on1309249643
Document Type :
Electronic Resource