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Limestone is various sizes with the same chemical and physical composition. The sizes are 0-10mm (fluxstone), (10-19mm) and (19-35mm) kilnstone. The limestone serves as the raw material for quicklime production.
Production Limestone from the quarry is crushed and screened into various size aggregates. MAJOR USES OF LIMESTONE Metallurgical Operations In metallurgical operations, fluxstone (10mm to dust) and kilnstone (10-35mm) is used in Mine smelters to flux the metal ores to form slag. Glass Manufacture Limestone improves properties of calcium silicate products such as tumblers, glasses and bottles. Limestone inhibits chemical attack, makes it less brittle and stronger but improves appearance and heat shock of glass. Limestone is the lowest- cost fluxing material for glass.
Building Industry In building industry fluxstone is used to produce both load bearing and non-load bearing building blocks. 10 to 19 mm aggregates from lime works is extensively used in both the foundation and slab of buildings. Coal Mining To enhance mine safety pulverised limestone is applied on working areas in order to dilute the highly combustible and explosive coal dust. Cement Manufacture Limestone constitutes over 80 % of material needed for Portland Cement manufacture, Cement is manufactured by blending lime, silica, alumina, iron and sulphate in precise proportions. KILNSTONE SPECIFICATION
| No | Characteristics | Value | Comment | | 1 | Total Calcium Oxide as % T/CaO | 54.00 | Minimum | | 2 | Calcium Carbonate as % CaCO3 | 96.00 | Typical | | 3 | Magnesium as % MgO | 0.40 | Typical | | 4 | Iron as % Fe2O3 | 0.06 | Typical | | 5 | Sulphide as ppm H2S | 38 | Typical | | 6 | Manganese as % MnO | <0.01 | Typical | | 7 | Lead as % Pb | <0.01 | Typical | | 8 | Zinc as % Zn | <0.01 | Typical | | 9 | Nickel as % Ni | <0.01 | Typical | | 10 | Copper as % Cu | <0.01 | Typical | | 11 | Loss On Ignition as % LOI | 42.50 | Typical | | 12 | Silica % Mass | 0.5 | Typical | | 13 | PSD as % falling within 19 – 35 mm range | 80 | Maximum | | 14 | Massive (hard) to semi-sugar, dark to medium grey, fine to medium grained limestone. | | | |