Limestone, limestone crusher, hammer crusher

Limestone introduction:
Limestone is a sedimentary rock composed largely of calcite, calcium carbonate (CaCO3). Limestone often contains variable amounts of silica or siliceous skeletal fragment, as well as varying amounts of clay, silt and sand sized terrestrial detritus carried in by rivers.

Applications of limestone include:
-The manufacture of quicklime (calcium oxide) and slaked lime (calcium hydroxide);
-Cement (concrete) and mortar
-An excellent building stone for humid regions;
-Common in architecture
-Pulverized limestone is used as a soil conditioner to neutralize acidic soil conditions;
-Crushed for use as aggregate—the solid base for many roads;
-Glass making, in some circumstances;
-Added to paper, plastics, paint, tiles, and other materials as both white pigment and a cheap filler.
-Toothpaste
-Added to bread and cereals as a source of calcium
-Used in blast furnaces to extract iron from its ore
-Medicines
-Cosmetics


The Common limestone crusher include:
Jaw Crusher, JC series jaw crusher, Impact Crusher, CS Cone Crusher, Hydraulic Cone Crusher, Spring Cone Crusher, HCS90 limestone Crusher, VSI Crusher (Vertical Shaft Impact Crusher), Hammer Crusher, mobile limestone crusher.

The Development of Impact Crusher

Of the five crushing machinery series, both impact crusher and hammer crusher crush brittle materials mainly by impact action, so they are often called impact crusher. Compared with jaw crusher, cone crusher and roll crusher that crush materials mainly by squeezing action, impact crusher has the following features:

A. High crushing ratio. The crushing ratio of impact crusher can reach over 50, while it is difficult for jaw crusher, cone crusher and roll crusher to exceed 20. So impact crusher is widely used in the industry where the single-stage crushing is required, such as the limestone crushing in cement industry.

B. Good product particles. Under the influence of impact action, the crushed materials often crack in its most fragile surface. The selectively crushing method ensures higher probability of cubic product particles, the final product of impact crusher in needle flake can be less than 10%, while for jaw crusher, cone crusher and roll crusher, the final product in needle flake will be higher than 15%. Therefore, impact crusher is often used as the final crushing equipment to produce concrete aggregate in the industry where cubic product particles are required, such as the anti-skid surface in high-grade highway.

The application of crushers

There are four principal types of primary crushers. The Blake jaw crusher uses a double toggle to move the swinging jaw and is built in a variety of sizes from laboratory units to large sizes having a feed inlet 84 by 120 in. (213 by 305 cm). The Dodge jaw crusher uses a single toggle or eccentric and is generally built in smaller sizes. The Gates gyratory crusher has a cone or mantle that does not rotate but is moved eccentrically by the lower bearing sleeve. The Symons cone crusher also has a gyratory motion, but has a much flatter mantle or cone than does the gyratory crusher. The top bowl is spring-mounted. It is used as a primary or secondary crusher.

Secondary crushers include the single-roll crusher and the double-roll crusher which have teeth on the roll surface and are used mainly for coal. Smooth rolls without teeth are sometimes used for crushing ores and rocks. The hammer crusher is the type of secondary crusher most generally used for ore, rock, and coal. The reversible hammer mill can run alternately in either direction, thus wearing both sides of the hammers.

Crushing and pulverizing are processes in ore dressing needed to reduce valuable ores to the fine size at which the valueless gangue can be separated from the ore. These processes are also used to reduce cement rock to the fine powder required for burning, to reduce cement clinker to the very fine size of Portland cement, to reduce coal to the size suitable for burning in pulverized form, and to prepare bulk materials for handling in many processes. See also Materials-handling equipment.