Calcium magnesium carbonate,basic
Dolomite powder
CAS: 16389-88-1
Molecular Formula: C2CaMgO6
Calcium magnesium carbonate,basic - Names and Identifiers
| Name | Dolomite powder |
| Synonyms | DOLOMITE taraspite dolomitepowder Ground dolomite Dolomite powder dolomite(camg(co3)2) MAGNESIUM CALCIUM CARBONATE CALCIUM-MAGNESIUM CARBONATE calcium magnesium carbonate Calciummagnesiumcarbonate,light Calcium magnesium carbonate,basic |
| CAS | 16389-88-1 |
| EINECS | 240-440-2 |
| InChI | InChI=1/CH2O3.Ca.Mg/c2-1(3)4;;/h(H2,2,3,4);;/q;2*+2/p-2 |
Calcium magnesium carbonate,basic - Physico-chemical Properties
| Molecular Formula | C2CaMgO6 |
| Molar Mass | 184.4 |
| Density | 2.07 g/cm3 |
| Color | White |
| Use | Used as smelting iron and steel alloy flux, Glass raw materials, coatings, paint filler, plastic products polishing agent |
Calcium magnesium carbonate,basic - Upstream Downstream Industry
| Raw Materials | Dolomite |
Calcium magnesium carbonate,basic - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | dolomite is a carbonate mineral, the main component is magnesium calcium carbonate, and the chemical formula is CaMg(CO3)2; The theoretical chemical components are CaO 30.4%,MgO 21.7%,CO 247.9%. Mg in the components can be replaced by Fe, Mn, Co and Zn, and Ca can be replaced by Pb and Na, when the number of iron or manganese atoms exceeds magnesium, it is called iron dolomite or manganese dolomite. The ideal dolomite is a solid solution composed of 56% calcium carbonate and 44% magnesium carbonate. The colors are different due to impurities: off-white, white, yellow, light yellow, red, light red, green, blue, gray, brown or black. The crystal is a tripartite crystal system, the crystal is often rhombohedral, and the crystal plane is bent into a saddle shape. Dolomite is mostly white, gray, flesh-colored, colorless, green, brown, black, dark pink, etc., transparent to translucent, with glass luster. The aggregate is usually granular; the crystal structure is similar to calcite, often rhombohedral. Mohs hardness: 3~4; Density 2.86~3.20g/cm3, foaming with cold dilute hydrochloric acid; Dolomite calcination is divided into two stages: MgCO3 starts to decompose in calcium magnesium carbonate at 730~740 ℃ to produce MgO and CO2. When the temperature continues to rise to about 910 ℃, CaCO3 in dolomite begins to decompose. At this time, all carbon dioxide is removed and a mixture of calcium oxide and magnesium oxide is formed. |
| Use | Dolomite is hardly soluble in water (the solubility in water is 0.03218g/100g water), soluble in hot hydrochloric acid, but does not interact with 10% dilute hydrochloric acid. This feature can be used to distinguish calcite from dolomite. The composition of dolomite is a rock intermediate between limestone (CaCO3) and magnesite (MgCO3). Although some ores contain a considerable amount of magnesium carbonate, they 44% less magnesium carbonate than pure dolomite. This type of ore is usually called dolomite. Dolomite is rich in reserves, mainly distributed in Liaoning Haicheng, Qinghai Loyu, Gansu Yongdeng, Hubei Daye, Jiangsu Nanjing and other places in China. Mainly used in ceramic blanks and glazes, alkaline refractory materials, glass industry, but also as dolomite cement raw materials, building materials, in the metallurgical industry is a commonly used flux. It is used as alkaline refractory material and blast furnace ironmaking flux, partly used to extract metal magnesium, and can also be used to make calcium magnesium phosphate fertilizer and magnesium sulfate, etc. Used as smelting steel alloy flux, glass raw material, paint, paint filler, plastic product polishing agent |
| applied to metallurgical industry | 1. dolomite with a particle size of 30~120mm in magnesium smelting industry is an important raw material for producing magnesium metal. its smelting methods are mainly divided into two categories, namely electrolysis method and silicon thermal reduction method. 2, refractory material dolomite as one of the important raw materials of alkaline refractory materials, its importance is second only to magnesite, mainly used for steelmaking converter lining, open hearth furnace, electric furnace wall, followed by outside the furnace refining device and cement kiln and other thermal equipment. Dolomite can be used to make dolomite brick series (currently there are mainly conventional dolomite bricks, zirconium dolomite bricks, zirconium magnesium dolomite bricks, etc.), fused dolomite carbon bricks and fused magnesium dolomite carbon bricks. dolomite powder can also be used as plugging material for iron-making blast furnace. it is reported that dolomite with a particle size of 0 ~ 30mm has been directly used as plugging material for molten iron holes in blast furnace. If dolomite powder is burned white as a material for plugging molten iron holes in steelmaking blast furnaces, the effect is better than directly using it as a material for plugging molten iron holes. |
| applied to chemical industry | 1. producing magnesium carbonate the chemical composition (%) of dolomite required for producing magnesium carbonate is as follows: MgO>18,CaO>29,SiO2<4, and there is no definite requirement for k2o, na2o and acid insoluble content. At present, dolomite carbonization method is widely used to produce light magnesium carbonate in China. This product is the basic raw material of inorganic chemical industry. It is mainly used to manufacture magnesium salt, magnesium oxide, elemental magnesium, fireproof materials, printing ink, ceramics, daily chemical industry, filler and reinforcing agent for rubber products. It can also be used in shipbuilding, boiler, steelmaking, glass, pigment, medicine and other industries. 2. producing magnesium oxide magnesium oxide as a filler is widely used in rubber, enamel, wire and cable industries in industry. In addition, magnesium oxide is also an indispensable refractory material. At present, the new process of extracting magnesium oxide from dolomite in China is dolomite cycle method. In addition, the production process and method of preparing special silicon steel grade magnesium oxide with dolomite as the main raw material have also been developed. 3. Production of magnesium hydroxide The production of magnesium hydroxide can be obtained by decomposing dolomite by ammonification or acid method in addition to the intermediate process of producing magnesium oxide above. |
| glass products | dolomite and limestone are the third largest components of glass except silica sand and soda powder. In the production of bottle glass, soda powder is the most expensive component. Adding limestone can partially replace soda powder, but it will have adverse effects. The introduction of magnesium oxide in dolomite can further reduce costs. Dolomite can also provide calcium oxide in the glass industry, adding soda ash-gray-siliceous system to act as a flux. In addition, dolomite can also reduce glass aging, prevent chemical erosion caused by atmosphere or moisture, improve the plasticity of colored glass, and increase glass strength. Adding a certain amount of dolomite powder to make glass can effectively reduce the high temperature viscosity of the glass and improve the chemical stability and mechanical strength of the product. Practice also shows that the introduction of dolomite powder in the preparation of low-temperature ceramics and float glass ingredients can significantly save energy consumption. |
| application in ceramic production | dolomite is used in blanks and glazes, and MgO and CaCO3 components are introduced to replace talc and calcite. The role of MgO is to change the composition of the mixing system, thereby reducing the firing temperature of the body; promote the dissolution of quartz and the formation of mullite, increase the amount of quartz, reduce the amount of feldspar, thereby increasing the transparency of the body. Adding dolomite to the glaze is less smoky than adding calcite, and there is little crystallization phenomenon. This is caused by dolomite as a double salt mineral. The mixture of dolomite and marl can be used to make anorthite and diopside-wollastonite clinker, which is suitable for fast-burning porcelain. In the manufacture of wall tiles and fine pottery, the cost of this clinker is lower than that of calcium-magnesium compounds synthesized alone. |
| how to distinguish limestone and dolomite | generally speaking, people usually use hardness test method and acid test method to distinguish limestone and dolomite. The Mohs hardness test method is a simple mechanical test method, that is, another metal of known hardness is used to carve this stone. Limestone has a Mohs hardness value of 3.0, while dolomite has a hardness value between 3.5 and 4. The acid test rule is to apply diluted hydrochloric acid to the surface of the stone. The limestone reaction is strong, while the dolomite reaction is not obvious, and the surface will form powder. the chemical formula of dolomite is CaMg(CO3)2, which is a mineral composed of calcium carbonate and magnesium carbonate (the ratio of CaCO3 to MgCO3 is about 1:1). the theoretical chemical composition is CaO 30.4%,MgO 21.7% and CO2 47.9%. The colors are mostly white, gray, flesh, colorless, green, brown, black, dark pink, etc., transparent to translucent, with glass luster, hardness 3.5~4, specific gravity 2.85~2.9. Dolomite is a very versatile non-metallic mineral. It is an important calcium and magnesium resource on the earth and has extremely rich reserves. The main producing areas of dolomite in the world are southern Tyrol and Binnansuo in Switzerland, Quefosla in Pimont, Italy, Guanahuatuo in Northern England and Mexico, Gablin in Missouri, USA, and Japan. China is rich in dolomite resources, which are distributed in many areas. Dolomite ore is more than 4 billion tons, and magnesium-containing dolomite ore is also very rich, with proven reserves of more than 4 billion tons. Dolomite resources cover all provinces and regions in my country, especially Shanxi, Ningxia, Henan, Jilin, Qinghai, Guizhou and other provinces. Dolomite deposits are divided into hydrothermal type and sedimentary type according to their properties. Hydrothermal deposits are mainly widely developed in Liaodong and Jiaodong regions; sedimentary types are mainly distributed in Shanxi, Henan, Hunan, Hubei, Guangxi, Guizhou, Ningxia, Jilin, Qinghai, Yunnan, Sichuan and other provinces. |
Last Update：2024-04-10 22:29:15
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Raw Materials for Calcium magnesium carbonate,basic