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Tata Sponge Iron Limited (TSIL) was incorporated in 1982 as a joint venture of Tata Steel and the Industrial Promotion & Investment Corporation of Orissa Limited (IPICOL). It was set up for the production of sponge iron based on the TISCO Direct Reduction (TDR) technology, which was developed in-house at Tata Steel. Later during 1991, Tata Steel acquired IPICOLs stake and at present TSIL is a sister company of Tata Steel. The process of sponge iron making aims to remove oxygen from iron ore. When that occurs, the departing oxygen causes micro pores in the ore body making it porous. The final product, when observed under a microscope, resembles a honeycomb structure looking spongy in texture, hence the name sponge iron.
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