Ferro alloy refers to various alloys of iron with a high proportion of one or more other elements such as manganese, aluminium, or silicon.They are used in the production of steel and alloys.The alloy impart distinctive qualities to steel and cast iron or serve important functions during production and are, therefore, closely associated with the iron and steel industry, the leading consumers of ferroalloys.

Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3).

USES OF LIMESTONE:

• It is the raw material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar.
• Pulverized limestone is used as a soil conditioner to neutralize acidic soils (agricultural lime).
• Is crushed for use as aggregate—the solid base for many roads as well as in asphalt concrete.
• Geological formations of limestone are among the best petroleum reservoirs;
• As a reagent in flue-gas desulfurization, it reacts with sulfur dioxide for air pollution control.
• Glass making, in some circumstances, uses limestone.
• It is added to toothpaste, paper, plastics, paint, tiles, and other materials as both white pigment and a cheap filler.
• It can suppress methane explosions in underground coal mines.
• Purified, it is added to bread and cereals as a source of calcium.
• Calcium levels in livestock feed are supplemented with it, such as for poultry (when ground up).[14]
• It can be used for remineralizing and increasing the alkalinity of purified water to prevent pipe corrosion and to restore essential nutrient levels.[15]
• Used in blast furnaces, limestone binds with silica and other impurities to remove them from the iron.
• It is often found in medicines and cosmetics.
• It is used in sculptures because of its suitability for carving.

Chemical Analysis of Limestone