What Is Limestone And Limestone Application

2021-10-08

Summary´╝ÜWhat Is LimestoneThe main component of limestone is calcium carbonate (CaCO3). Lime and limestone are widely used as building materials and are also important r

What Is Limestone

The main component of limestone is calcium carbonate (CaCO3). Lime and limestone are widely used as building materials and are also important raw materials for many industries. Calcium carbonate can be directly processed into stone and burned into quicklime, but it is also dangerous in the production process. Quicklime becomes slaked lime by absorbing moisture or adding water, and slaked lime is also called hydrated lime.

Lime includes quicklime and slaked lime. The main component of quicklime is CaO, which is generally lumpy, pure white, and light gray or light yellow when it contains impurities. The main component of slaked lime is Ca(OH)2. The slaked lime can be formulated into lime slurry, lime paste, lime mortar, etc., which are used as coating materials and brick adhesives.

Source Of Limestone

Limestone is mainly formed in a shallow sea environment. Limestone generally contains some dolomite and clay minerals. When the content of clay minerals reaches 25% to 50%, it is called argillaceous rock. When the dolomite content reaches 25%~50%, it is called dolomitic limestone. Limestone is widely distributed, uniform in lithology, easy to be mined and processed, and is a kind of very versatile building material.

Status Quo Of Limestone Mining And Utilization

It has abundant limestone reserves in China, but the mining and utilization situation is uneven. The current problems are:

1. Low Resource Utilization

At present, the utilization rate of limestone mines that are officially mined has reached more than 90%, while the utilization rate of civilian mining resources is only 40%. Because the amount of civilian mining is greater than that of mechanized mining, it is estimated that the utilization rate of the entire limestone is about 60%.

2. The Scale Of The Mine Is Small And The Mining Technology Is Backward

There are several or even more than a dozen small mining mines around a mountain. This backward mining method not only has low labor efficiency, great safety risks and serious waste of resources, but also causes large-scale destruction of mountain and vegetation, causing serious harm to the ecological environment around the mining area.

How to incorporate the technological progress of the mine into the overall plan of the technological progress of the enterprise, carry out the overall plan for the development of the mine, and deal with the relationship between recent mining and transportation mining, high-grade and low-grade, high-quality and inferior quality, reasonable mining, comprehensive utilization, reducing the stripping ratio, and expanding the utilization rate of mine resources are very worthy of study.

Application Of Limestone

Applications of limestone particles ≥10mm:

Used as aggregate for highways, railways, concrete mixing plants, etc.

Used for burning lime, used in iron and steel metallurgy industry.

Equipment recommended: jaw crusher, impact crusher and hammer crusher

Applications of limestone particles and tailings ≤10mm:

Processed to less than 5mm, used as machine-made sand (equipment recommended: sand making machine, hammer crusher, roller crusher)

High mud content, processed to 100 mesh, used as stone powder for plastering walls;

Low mud content, processed to 200 mesh, used as additive for asphalt mixing station;

Low mud content, processed to 325 mesh, used as commercial concrete additive;

High calcium content, processed to 250 mesh or 325 mesh as desulfurizer;

Equipment recommended: Raymond mill, vertical roller mill, ball mill;

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