1. Classification by production method
Calcium carbonate can be classified into heavy calcium carbonate, light calcium carbonate, colloidal calcium carbonate, and crystalline calcium carbonate depending on the method of calcium carbonate production.
Heavy calcium carbonate
Heavy calcium carbonate (commonly known as, heavy calcium, single fly powder, double fly powder, three fly powder, four fly powder) calcium
Calcium carbonate powder carbonate, heavy
Molecular formula: CaCO3 molecular weight 100.09 is referred to as heavy calcium, which can be obtained by mechanically pulverizing natural calcite, limestone, chalk, shell, etc. by mechanical means (using Raymond mill or other high pressure mill). Since the sedimentation volume of the heavy calcium carbonate is smaller than the sedimentation volume of the light calcium carbonate, it is called heavy calcium carbonate.
Nature: white powder. Odorless and tasteless. There is no change in the exposed air, and the specific gravity is 2.710. The temperature of 1339oC. Almost insoluble in water dissolved in water containing ammonium salts or ferric oxide, insoluble in alcohol. In the case of dilute acetic acid, dilute hydrochloric acid, dilute nitric acid, it is inflated and dissolved. The heat is decomposed into calcium oxide and carbon dioxide.
Uses: According to the different pulverization fineness, the industry is divided into four different specifications: single flight, double flight, three flight, and four flight, which are used in various industrial sectors.
Process and process
Crushing method: a finished product obtained by crushing, classifying and separating white stone containing more than 90% of CaCO3 by Raymond mill or other high-pressure grinding.
Packing: Packed in plastic bags, each bag has a net weight of 50 kg.
Storage and transportation precautions are stored in a dry warehouse. Prevent bag breakage during transportation. Do not store and transport with liquid acids.
Light calcium carbonate
Light calcium carbonate (precipitated calcium carbonate) calcium carbonate, light molecular formula CaCO3 molecular weight 100.09. Also known as precipitated calcium carbonate, referred to as light calcium, calcined raw materials such as limestone to produce lime (the main component is calcium oxide) and carbon dioxide, and then water to digest lime to form lime milk (the main component is calcium hydroxide), and then carbon dioxide carbonization The lime milk is precipitated by calcium carbonate and finally obtained by dehydration, drying and pulverization. Alternatively, the metathesis reaction is carried out by using metathesis of sodium carbonate and calcium chloride to form a calcium carbonate precipitate, followed by dehydration, drying and pulverization. Since the sedimentation volume (2.4-2.8 mL/g) of the light calcium carbonate is large (1.1-1.4 mL/g), it is called light calcium carbonate.
Nature: white powder. It is tasteless and odorless. The specific gravity is about 2.71. Decomposed at 825 ~ 896.6oC. The temperature of 1339oC. There are two forms of amorphous and crystalline form, and the crystal form can be divided into orthorhombic and hexagonal crystals, which are columnar or rhomboid. Hard to dissolve in water and alcohol. Soluble in acid, while releasing carbon dioxide, is an exothermic reaction. Also soluble in ammonium chloride solution. Stable in the air with a slight moisture absorption capacity.
Uses: Can be used as a filler in the rubber, plastics, paper, paint and ink industries. Widely used in the production of organic synthesis, metallurgy, glass and asbestos. It can also be used as a medium agent for industrial wastewater, an antacid for gastric and duodenal ulcer disease, an antidote for acidosis, an SO2 eliminator for SO2-containing waste gas, a cowlet feed filler and a grease felt. . It can also be used as a raw material for tooth powder, toothpaste and other cosmetics.
Process and process
Carbonization method: after the limestone and white coal are mixed in a certain ratio, after high temperature calcination, water digestion, carbon dioxide carbonization, and then centrifugal dehydration, drying, cooling, crushing, sieving, the finished product is obtained.
CaCO3→CaO+CO2
CaO+H2O→Ca(OH)2
Ca(OH)2+CO2→CaCO3↓+H2O
Packing: Packed in linen or plastic bags. The net weight of each bag is 50 kg or 25 kg.
Storage and transportation precautions: Store in a dry place. Avoid contact with acids. Care should be taken during transportation and no bulking. Pay attention to moisture.
Second, according to the classification of powder particle size
Calcium carbonate product is a kind of powder. According to the average particle size (d) of calcium carbonate powder, calcium carbonate can be divided into granular calcium carbonate (d>5μm) and fine powder calcium carbonate (1μm).
Construction Profile,Aluminium Profile,Aluminum Profile
Scaffold Accessories,Bulding Projects Accessories Co., Ltd. , http://www.chaluminumextrusion.com