alexa Powder Metallurgy

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Powder Metallurgy

Micaceous Hematite/Micaceous Iron Oxide (MIO)/Speculariteis a chemically inert, non-toxic ferric oxide mineral with blocky or platy crustal with a strong micaceous parting. It is mainly used as coatings in pigment industry and as a replacement for iron powder in welding electrodes. The specifications for coating and welding electrode industry is that the concentrate shall analyze Fe>65%, SiO2<2%, Al2O3<2% LOI<1%, Size 100%<0.1 mm, Specific gravity>4.8 and lamellar content >70%. The pellet grade concentrate shall analyze Fe>63%, SiO2<4%, Al2O3<3% LOI<2%, Size 100%<0.1 mm and moisture<8%. Deposits of quality MIO pigments in the world are limited. MIO is mined in Austria, South Africa, Spain and Morocco in small extends. Austria is the world leader in the production and export of such pigment. In India very limited deposits of micaceous hematite are found inVeldurthy, Kurnool district, Andhra Pradesh, Katni, Jabalpur District, Madhya Pradesh, and Neemkathana, Jaipur district, Rajasthan. Most of them use hand picking, pulverizing and is marketed as coating grade MIO for paint and welding electrode industries on a small scale. The sample was collected from Krishnapuram village, Veldurthi Mandal Kurnool AP (15oN and 78oE). The ENE trending Ramalkota- Kalva-Gani, fault alignment in Kurnool basin extending into archeans genisses-Proterozoic sediments of Kadppa in the west, houses MIO associated with quartz, due to igneous intrusions near Veldurthi area. The specular hematite quartzite ore assaying 30-60% Fe, 3-18% SiO2 and traces to 0.04%P with 50% mean Fe, is estimated to have indicated reserves of 3.7 million tons in Veldurthi area. The aim of the work was to evolve a process to produce obtain coating-welding rod-concentrate, assaying Fe>65%, SiO2<2%, Al2O3<2% LOI<1% and 100%<0.1 mm or pellet grade concentrate assaying Fe>63%, SiO2<4%, Al2O3<3% LOI<2% and 100%<0.1 mm by a simple eco-friendly process.

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