Hyderabad, India
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Singh R.,Wildlife Institute of India | Krausman P.R.,University of Montana | Pandey P.,Wildlife Institute of India | Qureshi Q.,Wildlife Institute of India | And 3 more authors.
European Journal of Wildlife Research | Year: 2014

Long-term data of large felids is important to understand their reproductive biology and behavior for effective conservation planning. We used camera trap data and direct sightings from 2005 to 2013 to estimate the age of the first parturition of Bengal tigers (Panthera tigris) in a semi-arid habitat in India. We monitored 11 females in the Ranthambhore Tiger Reserve (RTR) from when they were 2-6 months old. The mean age at first reproduction (impregnation leading to cubs) was 51.3 ± (SE) 4.5 months. The tiger population in RTR is an important source population and genetic pool in the western most distribution of tiger. Thus, continuous monitoring of tiger populations is important to develop an understanding of reproductive biology. © 2013 Springer-Verlag Berlin Heidelberg.

Kumar K.,NMDC Ltd | Sharma S.K.,NMDC Ltd
Advances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 | Year: 2014

One of the great triumph in the field of Nano materials and metal by Nano technology is the success in developing of nano sized iron powder from iron ore concentrate (Blue Dust). NMDC has taken an initiative to utilize high-grade blue dust to produce value added product i.e. Nano structure iron powder (NSIP), which can fetch high value. After the up gradation of blue dust by physical method, the samples were leached by acid to produce value added product from blue dust. This was followed by leaching, precipitation, drying, reduction, grinding in argon atmosphere and characterized by SEM, XRD etc to confirm its nano character. This value added product having less than 100 nanometers size has its applications in computer engineering, electronics, instrument making, medicine, catalysis etc. Component made from Nano structured materials have attracted large attention due to their high strength, excellent functional properties, better corrosion resistance, reduced sintering temperatures, etc. Paper contains preparation of nanosized particles (less than 100 nanometers) is connected to influence the dimensional effect on their physical, chemical, Mechanical and other properties.

Som R.,NMDC Ltd.
Journal of Mines, Metals and Fuels | Year: 2011

The turnover NMDC has surpassed the Rs.10,000 crore mark and profit after tax has crossed Rs.6,000 crore mark, the highest ever in its history. Due to improved production and availability of iron ore from its mines, the company has been able to meet the demand of its long-term customers both in domestic market and export market. The company has procured two new generation drills capable of drilling up to maximum of 800 m even in hard rock formations. NMDC as part of its diversification plan through value addition to its core activity of iron ore mining, is setting up a 3 mtpa green field integrated steel plant at Nagamar of district Bastar in Chattisgarh state. The company has formed its international global investment division, NMDC Global in order to focus expanding its geographical footprint around the world and augmenting its resource base. NMDC has signed a memorandum of understanding with OJSC Severstal, Russia to jointly set up an integrated steel plant with an initial capacity of 2 million tpa in Karnataka.

Chaurasiya S.K.,NMDC Ltd | Markandeya R.,Jawaharlal Nehru Technological University
26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings | Year: 2012

To meet the ever increasing demand of iron oxide feed stock for rapidly growing domestic steel industries and to effectively manage the depleting reserve of high grade lumpy iron ore, Pelletization of iron ore fines/slimes are expected to play a dominant role in the near future. Use of pellets will also enable the blast furnace operator to achieve higher levels of productivity with lowering of operating cost. The effective utilization of Iron Ore Slimes is important not only from the point of view of optimum utilization of Iron values in the mined ore but also for preventing environmental pollution. A significant amount of slime is being accumulated at the tailing dam of one of the iron ore mines and with the present scale of operation the tailing dam will be filled in another 10 years. Hence to increase the life of tailing dam and for better utilization of the iron values a study has been carried out for the suitability of pellet manufacturing with slimes and fines at our laboratory. The pelletization studies are aimed for optimization of various parameters for production of Blast furnace/ DR grade pellets from beneficiated slimes and Fines. This paper attempts to describe the production of blast furnace grade pellets from beneficiated slime and fines and its characterizations.

Satpathy P.K.,NMDC Ltd. | Kumar P.,NMDC Ltd.
Rock Fragmentation by Blasting, FRAGBLAST 10 - Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting | Year: 2013

Production blasts with 250 mm drill diameter were carried out at 1164 mRL at 150 m distance from the sensitive structures. The sensitive structures include old shallow-buried water tank and a surface structure viz., pump house, at 1152 mRL. The brick and mortar constructed water tank, 18 m diameter and 6 m deep, is located in hard rock hill slope and supplies water to both mining complex and crushing plant. The paper firstly deals with magnitudes of vibration monitored for different blast geometries at different distances within this deposit. Thereafter, considering the magnitudes of vibration monitored for different blast design and initiation pattern evolved a compatible and feasible blasting sequence and blast design pattern for safe excavation of ore at 1164 mRL. The blasting sequence and the blast designs adopted in this deposit did not cause damage to both pump house (above surface) and water tank, the sub-surface structure. © 2013 Taylor & Francis Group.

Rao G.V.,NMDC Ltd | Sharma S.K.,NMDC Ltd
Transactions of the Indian Institute of Metals | Year: 2016

The National Steel Policy 2005 estimated domestic steel production of 110 MTPA by the year 2019–2020, which was revised by the National Steel Policy 2008, envisaging domestic steel production of the country to be 180 MTPA by 2019–2020. About 2.5 tonnes of ROM iron ore or 1.7–2.0 tonnes of processed iron ore is required for one tonne of steel production. To meet the projected steel production of 180 MTPA by 2019–2020, the iron ore requirement have to be in the order of 500 MTPA which includes long term projected export contracts of around 100 MT. Raw materials are crucial in determining the competitive growth of steel industry as this is an input-intensive extractive industry. Situation calls for proportionate development expansion in adequate raw material supply to meet the demand of Indian steel Industry. India is almost completely self sufficient with regard to iron ore but with future steel production envisaged, an adverse impact on the reserves, position is rather imminent. The existing reserves of hematite (averaging around 63 % Fe) are the only source of iron ore and as such, these reserves may not last beyond 25–30 years at the present rate of consumption. Hence, to meet the future and projected requirement, additional domestic resources have to be created. The ores and minerals are site specific, non-renewable and finite. It is a challenging task for iron ore producers to meet the demand as per the national steel policy. In order to meet the demand, the iron ore producers has to face challenges like increasing the resource base, increasing production and productivity, utilisation of low grade iron ores, beneficiation of low grade fines and slimes, overcoming the infrastructure bottlenecks like roads, railways, ports, power, capital and water, human resource, handling, storage and utilisation of slimes/tails, encouragement for R&D activities, adopting environmental friendly measures and land acquisition for setting up new plants. In this paper all the above aspects are discussed thoroughly. © 2015, The Indian Institute of Metals - IIM.

Nanda N.K.,NMDC Ltd | Gopalakrishna S.J.,VSK University
Journal of Mines, Metals and Fuels | Year: 2014

The export of acceptable grade iron ore over the last decade and ever increasing demand of good quality iron ore for steel making is contributing for depletion of high grade ore reserves. The national steel policy also projects for raw material requirement (iron ore) in excess of 200 million tonnes beyond 2015. The reduction in threshold value of iron in combination with other factors, drive the iron ore mining industry to explore all possible options for utilization of low/lean grade resources. In this context, an investigation is made to develop suitable process utilize the low grade resources of Sandur area, Karnataka. The sample subjected to study was processed using two alternate flowsheets. The first one aimed to produce concentrates in the form of sinter fines and pellet feed concentrate where the second on for producing exclusively pellet feed concentrate. The feed sample analyzes about 55.5% Fe, 9.5% SiO 2 and about 6.3% Al2O3. The first process produced concentrate in the form of sinter fines with 64.4% Fe and 33.7% yield and the pellet fred concentrate analyze 63.54% Fe with 22.47% yield. The combine concentrate analyze 64.04% Fe, 3.85% SiO2 and 2.14% Al 2O3. The yield of concentrate is 56.17% and Iron recovery of 64.71%. The second process adopted to produce pellet feed grade concentrate resulted in concentrate assaying 65.05% Fe with 63.95% yield and 74.4% Fe recovery. It is evident that these low grade resources are amenable for beneficiation and the resulting concentrates are with the acceptable quality for iron and steel making.

Mukherjee A.,NMDC Ltd | Jha S.,NMDC Ltd | Babu E.V.S.S.K.,CSIR - Central Electrochemical Research Institute | Verma C.B.,NMDC Ltd
Journal of the Geological Society of India | Year: 2014

Multi-parametric and systematic exploration for kimberlite search was made in the vicinity of the Kalyandurg area within the Closepet granite, Dharwar craton, south India involving Remote Sensing and Airborne Geophysical Surveys (100 and 200 m spacing; 60 m AGL), Stream Sediment Sampling as well as Electron Probe analysis of heavy indicator minerals. The bipolar aeromagnetic anomaly (pronounced by high-low pair) falls in the positive drainage catchment delineated by stream sediment sampling. Subsequent drilling by a private party over the suspected anomalous zone resulted in the discovery of kimberlite. This is being reported here as the KL-7 kimberlite of the Kalyandurg cluster. Petrographically, the kimberlite shows typical porphyritic texture with macrocrystal olivine grains (~ 500–4500 μm) set in a groundmass composed of abundant phlogopite, perovskite and microcrystal olivine and clinopyroxene. Xenocrystic chromite grains were also observed. Preliminary studies on the mineral chemistry indicates that the olivine grains are foresterite-rich (Fo = 88–92) with an average MgO wt. % of 49.61. Groundmass phlogopites are of kimberlitic affinity with high Mg# (Mg/Mg+Fe2+) ranging between 0.88 and 0.91. The Cr-spinel macrocrysts with high Cr2O3 (> 62 wt. %) are considered to have formed from a primary garnet-peridotite-derived melt. The ilmenites have 8 to 12 wt % MgO and indicate kimberlitic affinity. Based on the current discovery, a suitable investigation strategy is also being suggested here for future kimberlite exploration in the area within the Closepet granite of the Dharwar craton, South India. © 2014, Geological Society of India.

Kumar B.R.,NMDC Ltd.
Journal of Mines, Metals and Fuels | Year: 2010

The decline in the global steel production has led to the decrease in the demands of iron ore during the economic recession across the world. Global steel production witnessed a decline in the year 2008 by 1% as compared to 2007. Iron ore production comes from 41 mines in public sector and 220 mines in private sector while the public sector accounts for 32% of total production while private sector 68%. Indian iron ore production grew at a compound annual rate of 11.2% over the five years to reach 222.5 Mt in 2008-09 and iron ore consumption in India grown at an annual rate of 17%. Global economy growth rate in 2010 and 2011 is estimated to be 3.2% respectively due to the contraction of 2.1% in 2009. Emerging markets are expected to grow at a rate of 5.7% and 5.9% compared to 2.1% and 2.3% in industrialized countries. The annual inflation in developed countries would rise from zero inflation in 2009 to 1.3% in 2010 and 2011.

Tripathi P.R.,NMDC Ltd
Journal of Mines, Metals and Fuels | Year: 2010

The iron minerals including magnetite, hematite and goethite market has emerged significantly across the world. The large magnetite deposits of around 3 billion tones which are available in Western Ghats cannot be considered for exploitation by the traditional opencast mining method since the environmental issues cannot be mitigated by adopting opencast mining. Global steel production grew rapidly between 2003-2008 at a CAGR of 6.6% due to the strong demand from China and other countries. It has been expected that steel production may continue to drop in the year 2010 also and may stabilize only after 2011 onwards when world wide economic recovery may stabilize. It is required to examine the steel making process routes for arriving at proper conclusion with regard to requirement of iron ore raw material. The route of blast furnace, basic oxygen furnace (BF-BOF), is producing around 65% of the total crude steel, while 35% of the total production is obtained through EAF and other routes which utilize scrap and other metallics such as DRI and HBI.

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