What is Limestone?
Limestone is a rock made of calcite. Most limestone is grey, but all colours of limestone from white to black have been found. Scientists test natural rock to see if it is limestone by pouring cold diluted hydrochloric or sulphuric acid (10% solution or vinegar) on it. Limestone gives off bubbles of carbon dioxide.
Most fresh water and sea water contain dissolved calcium carbonate. All limestone’s are formed when the calcium carbonate crystallizes out of solution. Or from the skeletons of small sea urchins and coral All the different kinds can be divided into 2 groups.
What is Limestone Used For?
Acid rain – neutralization of acid lake waters
Agriculture – soil stabilization and pH control
Air quality – neutralizes sulphur dioxide gases from industrial processes such as smelting metal ores and coal fired generating stations
Aggregate for concrete and road building
Building construction – bricks, mortar, plasters
Cotton – bleach
Dyes – manufacture and purification
Hazardous waste disposal – PCB sludge solidification and neutralization
Neutralizing acid mine drainage
Oil – purification of oils and gasoline
Pharmacuticals – asprin, penicillin etc..
Poultry grit – shell-forming material
Soda Pop – makes the bubbles in pop
Solid waste disposal: stabilizes sludge from sewage and desulphurizing plants.
Smelting Iron Ore
Sugar, purification of sugar beets.
Tanning of leather
Waste water treatment – removes phosphorous and nitrogen, odor control, kills bacteria and aids in clarification
Water Treatment – drinking water clarification
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