Limestone 2019-11-12 10:13:02

Limestone Characteristics

The main component of limestone is calcium carbonate (CaCO3) with a Mohs hardness of 3. After limestone is mined from limestone, it is crushed to form limestone particles, that is, stone, sand, or further ground to form limestone powder, which is widely used in building materials, highways, metallurgy, and chemical industries. Lime is divided into quicklime and slaked lime. After calcination, limestone becomes calcium oxide CaO (common name lime), which is generally in the form of blocks and is used in water treatment, asphalt improvement, desulfurization, building materials, medicine and other industries. The quicklime absorbs moisture or adds water to become slaked lime. The main component is calcium hydroxide Ca(OH)2, which is used in environmental protection, medicine, food and other industries.


Name: limestone

Chemical formula: CaCO3

Density: 2.93g∕cm3

Melting point: 825 ° C

Properties: In the case of dilute acetic acid, dilute hydrochloric acid, dilute nitric acid, it is inflated and dissolved. Decomposes into calcium oxide and carbon dioxide under high temperature conditions.

Lime powder processing process

The main component of lime powder is powdered calcium carbonate. The limestone is first calcined to make lime powder. The processing equipment used for lime powder production mainly includes crusher, mill, lime rotary kiln calcination. device.

Limestone crushing treatment: First, the limestone is crushed by a crusher, broken into small pieces of the same size, and then the limestone is transported by a conveyor to be crushed by a fine crusher. The finely crushed stone is separated by a vibrating sieve. The small stones, the larger stones return to the crusher for further crushing.

Pre-homogenization of raw materials: The purpose of pre-homogenization of raw materials is to make the limestone components uniform. The pre-homogenization technology is to use the scientific stacking and reclaiming technology to realize the initial homogenization of raw materials in the process of depositing and taking raw materials. The chemical and mineral composition of limestone will fluctuate. After a period of time, the finished lime will be uniformly mixed in the lime storage to obtain a lime product with uniform batch composition and uniform performance.

Milling process: The limestone material is evenly put into the limestone mill for milling. It is worth mentioning that the equipment has high grinding efficiency, large mill output and low power consumption, especially when grinding limestone. When the limestone is continuously ground and reaches the lime powder, it is the finished product.

Rotary kiln calcination: lime lime kiln can be used to calcine lime powder material. When the material enters the lime rotary kiln, the material further decomposes rapidly and a series of solid phase reactions occur to form equal minerals in the lime powder clinker. As the temperature of the material increases, the mineral becomes a liquid phase. After the clinker is fired, the temperature begins to decrease. Finally, the high temperature clinker discharged from the lime rotary kiln is cooled by the lime clinker cooler to the temperature that can be withstood by the downstream conveying, storage and lime grinding, and the sensible heat of the high temperature clinker is recovered, and the thermal efficiency and clinker quality of the system are improved.

The equipment for processing lime powder is produced by a complete production line of lime rotary kiln. Limestone is processed into lime powder, which plays different roles in different fields. Specialized in the design, research and development, manufacturing, installation and commissioning of rotary kiln, it has mature technology in the field of producing lime. The use of rotary kiln for calcination to produce lime powder has high efficiency, high output, high reliability and low failure rate. ,long lasting.

Fineness usage Equipment recommendation
40 mesh - 150 mesh Mainly used in construction, interior and exterior wall coatings, chemical raw material filling, weighting, paper making, various sealants and other chemical products. MTM series medium speed grinding
150 mesh - 200 mesh This is generally limestone with a very low calcium content. Used on highway asphalt mixing plants. MTW series European version grinding
250 mesh - 325 mesh Desulfurization of power plants. Two standards, one is 250 mesh through 90, the second is 325 mesh through 90, and this limestone is high in calcium, CaO content is above 50%, CaCO3 content is above 90%. LM vertical mill

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