Limestone, also known as calcium carbonate, is a compound with the chemical formula CaCO3. CAS No. 47134-1. It is a common substance on earth and can be found in rocks. The main components of the back shell of an animal and the shell of a snail. It exists in nature as calcite and aragonite. Calcite belongs to the trigonal system, hexagonal crystal, pure calcite is colorless and transparent, generally white, contains 56% CaO,44% CO2, density is 2.715g /cm3, Mohs hardness is 3, and the property is brittle. Aragonite belongs to rhombohedral strain, rhombohedral crystal, gray or white, density of 2.94g/ cm3, Mohs hardness of 3.5-4, dense properties. The crystal size of calcite is very important in the physical properties of limestone. Dense limestone shows a fine-grained crystal structure with low porosity and high strength. The densities of limestone, dolomitic limestone and dolomite are 2.65-2.80g /cm3, 2.70g / cm3-2.90g /cm3,2.85-2.95g/cm3 respectively. The bulk density depends on the porosity.
Limestone sand making machine is widely used in all kinds of stone construction sand (river stone, rock, sandstone, slag, granite, etc.), mine metal ore, non-metallic ore, refractory, glass raw material, waste glass recovery, can also be used as fine crushing equipment of mineral processing equipment is particularly effective, greatly reducing the pressure of ball mill, more crushing and less grinding, which greatly increases the output of ball mill. The limestone sand making machine is mainly an equipment for fine crushing limestone to 0-5mm strength. Limestone enters the sand making machine from the feed hopper and divides the material into two parts. One part enters the high-speed rotating impeller from the middle of divider, and is rapidly accelerated in the impeller. Its acceleration can reach hundreds of times of gravity acceleration, and then ejected from the three uniformly distributed channels of impeller at a speed of 60-70m / s. The ejected material and the material are broken in the collision with each other, and then impact on the material lining in the vortex branch cavity together, bounce by the material lining layer, impact obliquely upward to the top of the vortex cavity, and change its movement direction and turn downward. The material emitted from the impeller channel forms a continuous material curtain. Limestone sand making machines are common in all regions of our country, and limestone crushing is the most advantageous and core competitive field of Yusheng heavy Industry.
Limestone can be widely used as building materials, and it is also an important raw material for many industries. Limestone can be directly processed into stone and fired into quicklime. Lime has quicklime and hydrated lime. The main composition of quicklime is that CaO, is generally lump, pure white, and light gray or yellowish when it contains impurities. Quicklime absorbs moisture or adds water to become hydrated lime. Hydrated lime is also called hydrated lime. Its main component is Ca (OH) 2. Hydrated lime is prepared into lime paste, lime paste, lime mortar, etc., which is used as coating material and brick adhesive. Cement is made from a mixture of limestone and clay and calcined at high temperature. Glass is made by melting limestone, quartz sand and soda ash at high temperature. Limestone is used as a flux to remove gangue in ironmaking. Steelmaking uses quicklime as slagging material to remove sulfur, phosphorus and other harmful impurities. Calcium carbide (mainly CaC2) is made by the reaction of quicklime and coke in an electric furnace. Soda ash is made from limestone, salt, ammonia and other raw materials by multi-step reaction (Solvay method). Caustic soda was prepared by the reaction of hydrated lime and soda ash (causticizing method). The bleached one is prepared by the reaction of pure hydrated lime and chlorine. Important calcium salts such as calcium chloride, calcium nitrate and calcium sulfite are prepared by chemical processing of limestone. Hydrated lime can remove the temporary hardness of water and is used as a softener for hard water. Limestone is fired into pure powdered calcium carbonate, which is used as a filler for rubber, plastic, paper, toothpaste, cosmetics and so on. Alkali lime made of lime and caustic soda, used as an absorbent for carbon dioxide. Quicklime is used as a desiccant and disinfectant. In agriculture, quicklime is used to prepare lime sulfur mixture, Bordeaux liquid and other pesticides. The application of hydrated lime in the soil can neutralize the acidity of soil, improve the structure of soil, and supply calcitonin for plants. Brush the tree trunk with lime paste to protect the tree.
