Manganese Ore
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Manganese ore is required in iron making to control the manganese content of the hot metal in the desired range. Unlike other plants, where manganese ore lump is used directly in blast furnace, in VSP, it was proposed to use manganese ore fines in sinter productions. This would ensure much more consistent manganese content in the hot metal. The requirement of manganese ore for VSP was proposed to be met mostly from open market and to develop a small captive mine in Andhra Pradesh to meet the exigencies. Minerals and Metals Trading Corporation and Manganese Ore India Limited were the principal suppliers of manganese ore to the existing public sector steel plants.
There are a number of volumetric methods for determining manganese in manganese ores; however, these are unlikely to be suitable for the determination in silicate rocks. The method most commonly employed is spectrophotometric determination based upon the oxidation of manganese (II) to permanganate with either potassium periodate or ammonium persulfate in the presence of silver ions as catalyst. A method for the determination of manganese in silicate rocks is based upon the reaction of manganese (II) with formaldoxime in alkaline solution. The most serious interference appears to be that from iron that also forms a highly colored complex with the reagent. This chapter discusses the spectrophotometric determination of manganese as permanganate. It discusses the use of sulfuric acid and hydrofluoric acids to decompose the sample material. After the decomposition of any remaining accessory minerals, the rock solution is diluted to volume for the determination of manganese. The chapter also describes the determination of manganese by atomic absorption spectroscopy (AAS).