limestone is used purifying iron ore in Venezuela

Cerro Bolvar hill of iron ore in north-central Bolvar estado (state) southeastern Venezuela Discovered in 1947 the hill is 3 / 4 mi (1 2 km) wide 4 mi long and rises 1 650 ft (500 m) above the surrounding grasslands in the Guiana Highlands With San Isidro to the south it was one of the most important mineral finds in the 20th century Sep 01 2010How does limestone purify iron in a blast furnace? I just want to know simply how limestone purifies iron in a blast furnace ) Answer Save 1 Answer Relevance Colin Lv 7 10 years ago Favorite Answer It removes the sandy impurities in the iron formed as 'slag' [calcium silicate]

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The above classification scheme is the most commonly used and accepted though sometimes an older system is used which divides iron-rich sedimentary rocks into three categories bog iron deposits ironstones and iron formations A bog-iron deposit is iron that formed in a bog or swamp through the process of oxidation

Type of surface mining used where the terrain is flat An earthmover strips away the overburden and a power shovel digs a cut to remove the mineral deposit After removal of the mineral the trench is filled with overburden and a new cut is made parallel to the previous one The

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IRON After oil iron is the second most-mined mineral in Venezuela It is estimated that Venezuela has 1 8 billion tons of high-grade iron ore reserves In the 1950s the Venezuelan government gave mining rights to 2 American companies Bethlehem Steel and the United States Steel Corporation

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It is essential that the Al2O3 (alumina) be obtained substantially free from these impurities as otherwise the iron oxide and silica would be reduced and contaminate the metallic aluminum produced in the Hall (or Heroult) Process The separation of the alumina from the impurities in the bauxite ore is usually accomplished by the Bayer Process

It is also used in blast furnaces for iron purification Limestone together with quicklime and slaked lime are all used to neutralise excess acidity Related Information Iron Ore (Fe) Minerals Deposits in Nigeria - States and Uses Nigeria is among the African countries with vast iron ore deposits which can be found in some states in

Oct 12 2010The iron is then tapped from the bottom of the furnace to be further processed into steel or used to make iron castings for each tonne of iron produced there is about 370 kg of slag which being lighter than iron floats on top of it and is tapped off higher up the furnace for each tonne of iron produced the process uses 2 to 3 tonnes of air

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Generation of iron and steel slag NIPPON SLAG ASSOCIATION

Blast furnace slag is a combination of silica and other non-ferrous components of iron ore ash from coke used as a reducing material and limestone auxiliary material Because its specific gravity is less than that of pig iron during the heating process the molten slag rises above the pig iron allowing it to be easily separated and recovered

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Alumina Bauxite Quicklime is used in varying amounts to remove silica from bauxite ore and for causticization in the manufacture of' alumina The extent of its use depends largely on the quality of the bauxite used Purer ores require less lime and more limestone (Sinter process) while ores high in impurities require more lime (Bayer process)

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