digital divide network - article database

Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. It is commonly used for sculpture and as a building material.

Marble is a metamorphic rock which can result from regional or contact metamorphism. The original source rock is limestone.Marble has many economic uses.

Marble uses is following:

Construction marble is a stone which is composed of calcite, dolomite or serpentine which is capable of taking a polish. More generally in construction, specifically the dimension stone trade, the term “marble” is used for any crystalline calcitic rock (and some non-calcitic rocks) useful as building stone.

Colorless or light-colored marbles are a very pure source of calcium carbonate, which is used in a wide variety of industries.

Finely ground marble or calcium carbonate powder is a component in paper, and in consumer products such as toothpaste, plastics, and paints.

Calcium carbonate can also be reduced under high heat to calcium oxide (also known as “lime”), which has many applications including being a primary component of many forms of cement.

Marble Crusher and grining mill is a very important equipment useding marble stone mining and marble industry.

In order to be used for buiding materials or industrial powder, marble must be crushed into small pieces. In this crushing process, we need marble crusher.

Marble crusher is used to primary crush bigger marble stone, which include jaw crusher, cone crusher, impact crusher and so on. The bigger marble is crushed by marble crusher, then can be feeded to marble grinding mill for fine grinding. The marble grinding mill can be choose between ball mill, vertical mill, raymond mill, MTM mill, MTW mill and so on.

SBM is a professional stone crusher and grinding mill manufacturer in China, and has formed a complete product-chain that takes crushers and grinding mills as the main products, and vibrating screen, vibrating feeder etc as supplementary products. Now, our products have exported to many countries, such as USA, Vietnam, Libya, South Africa, Philippines, Indonesia, Pakistan etc, and received high popularity.

The first ironMills back until 1911 in Lubumbashi. Invested in the 1930s, the Belgian financial groups strongly in mining. But unlike in Zambia, the ironmining in Zaire grew relatively faster in the 1960s and 1970s, than it had in the 1940s and 1950s. 237,000 To 500,000 tons ironoutput rose between 1958 and 1974. Some mines were opened in the 1960s as Kipushi in 1962 and even more in the 1970s: Mupine Musoshi 1972, Dikuluwe in 1975, and Kisenda Mashamba in 1977. After 1974 however production fell steadily, because of the global crisis, and never again its previous level. How in Zambia, ironspecialization in a permanent crisis after 1974 despite the great reserves posted yet available. Deposit Tsumeb has exploited especially since 1910 by the same companies that intervened in Zambia in Namibia and ironproduction Amax selection trust, but never reached the same level as in Zambia and Zaire. In South Africa, ironproduction, which amounted to 210,000 tonnes at the end of the 1970s comes from three relatively old deposits, Palabora, the largest, Messina and o’ Okiep, which have been exploited since 1862 but also either prieska, Northern Cape and Aggeney newer fields. Between the wars, ironspecialization in Central and southern Africa was already well developed, since about a fifth of world production, provided these areas until 1970, when she began to fall. Among other metallic minerals chromium as important in this time, since Africa was also provided one-fifth of world production. Iron years production much later, during the 1950s and 1960s.