Lime and limestone are used in a large number of building materials and industrial raw materials. Limestone is processed directly into stone and fired into quicklime. Lime absorbs moisture or adds water to become hydrated lime. The main component is Ca(OH)2, which can be called calcium hydroxide. The slaked lime is formulated into lime slurry, lime paste, etc., and is used as a coating material and a tile adhesive. Let's learn about limestone together.
How is limestone formed
Limestone is mainly formed in a shallow sea environment. Limestone can be divided into crumb limestone (water transport, sedimentary formation) according to the genesis; bio-skeletal limestone and chemical, biochemical limestone. According to the structural structure, it can be subdivided into bamboo-like limestone, limestone, agglomerate limestone, and the like. The main chemical composition of limestone is that calcium carbonate is easily eroded, so more stone forests and caves are formed in limestone areas, which are called karst topography.
Limestone generally contains some dolomite and clay minerals. When the clay mineral content reaches 25% to 50%, it is called argillaceous rock. Dolomite content of 25% to 50%, known as dolomitic limestone. Limestone is widely distributed, with uniform lithology and easy extraction and processing. It is a very versatile building material.
The main component of limestone is calcium carbonate, which can be dissolved in water containing carbon dioxide. In general, one liter of water containing carbon dioxide can dissolve approximately 50 milligrams of calcium carbonate.
According to a survey of geologists in the Guilin area, it is found that the water there is dissolved and eroded every year. The surface of limestone is about as thin as a fingernail. Do not look at only eroding so little every year, but the history of the earth's development is extremely long. As far as the recent geological period, the Quaternary, is about 3 million years old. Even with such a slow dissolution rate, 900 million meters can be dissolved in 3 million years! The solitary peaks of Guilin are only one to two hundred meters high, and the maximum height of common caves is only tens of meters. But not all limestone formations can form such landforms. Instead, they need to have large areas, large thickness, and pure geological limestone. It is also necessary to have warm and humid climate conditions to develop into such a perfect landform. Beautiful natural scenery.
Limestone chemical properties
l) Chemical resistance
With the exception of acids, many aggressive substances cannot attack or slowly attack limestone.
2) Anti-acid traits
Limestone reacts with all the strong acids, producing calcium salts and releasing carbon dioxide. The reaction rate depends on the impurities contained in the limestone and their size. The higher the impurity content and the larger the crystal, the lower the reaction rate. Dolomite reacts more slowly than limestone. Dolomite, limestone determination method: a small amount of bubbles generated on the dolomite with 10% hydrochloric acid droplets, dripping on the limestone will produce odorless bubbles, the gas produced can make clear lime water becomes cloudy.
3) Resistance to various gases
Chlorine and hydrogen chloride react slowly with CaCO3 in a dry bath state and at room temperature, and do not accelerate until after 600°C to generate CaCl2. Sulfur dioxide has no significant effect on CaCO3, both gaseous and liquid, at normal temperature; and nitrogen dioxide ( NO2) reacts with CaCO3 to generate Ca(NO3)2, NO, and CO2 at 15°C.
The use of limestone
Limestone is an extremely valuable resource. Limestone is a trade name for limestone as a mineral raw material. Limestone is widely used in the history of human civilization because of its wide distribution and easy accessibility in the natural world. As an important building material, it has a long history of mining. In modern industry, limestone is the main raw material for the production of cement, lime and calcium carbide. It is an indispensable flux limestone in the metallurgical industry. After being finely ground, limestone is widely used. Used in the manufacture of paper, rubber, paint, coatings, pharmaceuticals, cosmetics, feed, sealing, bonding, polishing and other products. According to incomplete statistics, the ratio of limestone and building stone consumed in cement production, lime production, metallurgical flux, and ultrafine calcium carbonate consumed limestone is 1:3. Limestone is a non-renewable resource. With the continuous advancement of science and technology and the development of nanotechnology, the application of limestone will be further broadened.
Chemical formula of limestone
Limestone: CaCO3 ------ marble, granite, etc.
Lime Lime: Ca(OH)2 -------- used for construction, also called slaked lime
Lime: CaO -------- Desiccant, etc.
Summary: The above is the use of limestone and the chemical formula of limestone introduced by Xiao Bian. We hope that we can effectively help everyone. For more information, please pay attention to this website.
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