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Basalt belongs to basic volcanic rocks. It is also the main composition of earth's continental and oceanic crust and lunar highland and lunar mare. Basalt is a kind of basic extrusive rock and its chemical composition is similar to gabbros. Its SiO2 content varies  between 45% ~ 52% and its K2O + Na2O content  is slightly higher  than intrusive rocks, and  its CaO、Fe2O3+FeO、MgO content slightly lower than that .Its mineral composition is mainly basic feldspar and pyroxene, and its secondary mineral are olivine Peridot, hornblende and biotite, etc. Rocks are dark, generally black, sometimes grey green and dark purple and they have porphyritic structure. Pore structure and amygdaloidal structure are widespread. Basalt volume density is 2.8 ~ 3.3 g/cm3. Compression strength is very large in dense regions, up to 300 mpa and sometimes higher, and decreases if there are vitreous and porosity. Basalt has high durability and more joints. Its joint plane is mainly hexagon and brittle so it is not easy to pick large piece of stone. Due to the common porosity and almond construct although basalt are widely distributed on the earth's surface they are few used as facing stone.

Technological Process

In recent years, along with the strive of urbanization and infrastructure construction, the demand for raw material basalt is more exuberant and basalt investment prospect is also becoming clear. Its high production demand provides more opportunities for development of crusher, sand making machine, mill and other mining machinery equipment. Basaltic sand making machine plays an irreplaceable role in all kinds of ores fine crushing equipment. It can crush all kinds of hard rock (rock, granite, basalt, limestone, pebble, etc.) metal and non-metallic minerals into building sand and crushed stone accord with various granularities. Sand granularity is even and has high compressive strength, more than natural sand, and hammer breaking sand as to meet the requirements of high standard construction sand , more able to improve the quality of construction. Basaltic sand making production line process: through feeder into the coarse crushing equipment., aggregate after rough crushing into the fine crusher for secondary reshaping crushing ,then through the tape machine transmission to the screening plant for aggregate grading, after meeting the required finished aggregate, putting excess and grading aggregate not in conformity with the requirements into sand making equipment, aggregate crushed by basalt sand machine through tape machine again into the screening workshop for grading. Such crushing device, sand making equipment and screening device form a closed cycle to do processing into finished products of sand and gravel aggregate as needed. The production of artificial aggregate can be used in a dry or wet processing way. In the case of considering the environmental protection and water saving, the winnowing machine can be used for classification of the sand. This is beneficial to the environmental protection and for people to adjust and control stone powder content at any time.

Application Fields

Basalt is also the best materials to be used to repair the road, railway, airport runway among all kinds of the stones, with strong resistance to pressure, low crush value, strong corrosion resistance, asphalt adhesion, wear-resistant property, less water draft, poor conductive performance, and so on , and is recognized by the international community . It is the best foundation of development of railway transport and highway transport and it is also the good material in the manufacture of the "cast stone", which is the material after basalt being through melting casting, crystallization, annealing processing. It is harder and more wear resistant than steel alloy, and has more corrosion resistance than lead and rubber. It still plays the role of "lubricant" in steel casting advanced process and can extend the life of the cast film. At the same time, the basalt can also draw into glass fibers, with stronger alkali resistance than ordinary glass cloth and good in high temperature resistance. Basalt with many pores is also known as the pumice. Due to much porosity, and its hardness, it can be mixed in concrete and make the concrete weigh less. Not only durable, but also having the features such as sound insulation, heat insulation, it is good aggregate of lightweight concrete of high building. Pumice is also good grinding material and can be used to grind metal and stone; it also can be used as filter, dryer, catalyst, etc in industry.

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