Among all the materials in repairing highway, railway and airport runway, the basalt sand is the best one and features with strong resistance, low crushing strength, strong corrosion resistance and asphalt adhesion. What's more, the basalt also has other advantages, such as asphalt adhesion, low waterline and bad conductivity. It is recognized by the international and is the best footstone for railway and highway transportation.
The basalt belongs to effusive rock and mainly consists of pyroxene, feldspar, a few of pyroxene, olivine and hornblende. The basalt is fine grain or maculosus shape structure, or block or porosity shape structure. The volume density is 2900～3300kg／m3 and the compression strength is 100～300MPa. The basalt features with high brittleness and strong weathering resistance. It is mainly used for stone masonry such as base or bridge and after crushed it can be used as aggregate in strength concrete.
There are many kinds of basalts and the hardness of each kind is also different from others, so there are numerous kinds of basalt production equipments. In the dressing process of basalt, choosing appropriate basalt crushing equipment is according to the basalt hardness.
Among the basalt crushing equipments, the jaw crusher is one of the common equipments. Its max feeding size is decided by the mineral that is nipped by the crusher. Generally speaking, the max feeding size of jaw crusher is 75—85％ of the width of the feeding port. Generally, the max feeding size of the complex swing jaw crusher can reach the 85％ of the width of the feeding port and the simple swing type may be smaller, reaching the 75％ of the width of the feeding port.
In the crushing system of sand production line, the traditional simple jaw crusher with cone crusher or fine jaw crusher can't meet the the materials requirements of advanced construction sites. Because in such basalt gravels, the content of needle flake gravels and the gravels in the internal cracks is too high. In the traditional crushing process which uses the impact crusher as the secondary crushing, the shape of the gravels is better but the wastage of wearing pieces is very serious and the sand enterprises often can't bear such costs.
For this reason, our Zenith Machinery has done basalt crusher technology research and innovation. After technical transformation, the content of needle flake gravels in finished product reduced to 4.8%. Compared with the processing line that only uses impact crusher as the final crushing process, the output of our new technology is improved by 30-35%. The reason is that the crushing interger process is added and the reduction ratio and processing capacity are also improved. Compared with the processing line that uses impact crusher as the final crushing process to process gravels, the wear of quick-wear parts of each equipment is reduced by 25%. In the whole process, the wear of quick-wear parts is greatly reduced, because the cone crusher or impact crusher is used as secondary crusher and the metal consumption of efficient VSI（vertical shaft impact） crusher is quite low.
The main sand production line of basalt consists of: 1.vibrating feeder 2.deep cavity jaw crusher for basalt 3.basalt hydraulic cone crusher 4.basalt impact crusher 5.inclined vibrating screen 6.basalt impact crusher (stone interger machine)
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