|Place of Origin:||China|
|Minimum Order Quantity:||10mt|
|Delivery Time:||1 week|
|Payment Terms:||T/T, L/C, Western Union|
|State:||Fine Powder||Hardness:||3 Moh|
|Usage:||Additive Paint And Other||Purity:||98%|
Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock consisting mainly of calcite) and is the main component of pearls and the shells of marine organisms, snails, and eggs. Calcium carbonate is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale. It is medicinally used as a calcium supplement or as an antacid, but excessive consumption can be hazardous.
Agricultural lime, powdered chalk or limestone, is used as a cheap method for neutralising acidic soil, making it suitable for planting.
Calcium carbonate is a key ingredient in many household cleaning powders like Comet and is used as a scrubbing agent.
Carbonate compensation depth
The carbonate compensation depth (CCD) is the point in the ocean where the rate of precipitation of calcium carbonate is balanced by the rate of dissolution due to the conditions present. Deep in the ocean, the temperature drops and pressure increases. Calcium carbonate is unusual in that its solubility increases with decreasing temperature. Increasing pressure also increases the solubility of calcium carbonate. The carbonate compensation depth can range from 4,000 to 6,000 meters below sea level.
In 1989, a researcher, Ken Simmons, introduced CaCO3 into the Whetstone Brook in Massachusetts. His hope was that the calcium carbonate would counter the acid in the stream from acid rain and save the trout that had ceased to spawn. Although his experiment was a success, it did increase the amount of aluminium ions in the area of the brook that was not treated with the limestone. This shows that CaCO3 can be added to neutralize the effects of acid rain in river ecosystems. Currently calcium carbonate is used to neutralize acidic conditions in both soil and water.Since the 1970s, such liming has been practiced on a large scale in Sweden to mitigate acidification and several thousand lakes and streams are limed repeatedly.
Calcium carbonate is also used in flue gas desulfurisation applications eliminating harmful SO2 and NO2 emissions from coal and other fossil fuels burnt in large fossil fuel power stations.
|ATC code||A02AC01 (WHO) A12AA04 (WHO)|
|Safety data sheet||ICSC 1193|
|Lethal dose or concentration (LD, LC):|
|LD50 (median dose)||6450 mg/kg (oral, rat)|
|US health exposure limits (NIOSH):|
|PEL(Permissible)||TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)|
|Other anions||Calcium bicarbonate|
|Other cations||Magnesium carbonate