Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey.Basalt is used in construction (e.g. as building blocks or in the groundwork), making cobblestones (from columnar basalt) and in making statues. Heating and extruding basalt yields stone wool, an excellent thermal insulator.
The design of a stone crushing production line is usually decided by several factors: 1) raw materials to be crushed 2) The hardness, percentage of Si, moisture percentage of the raw materials 3) The average size of the raw materials before entering into the crushing system 4)Requested product sizes, percentage of the sizes, and their usage 5) hour capacity of the crushing line. We here suggest that three proposals: 1: vibrating feeder + primary jaw crusher + Impact crusher + vibrating screen + belt conveying system + control system. 2: vibrating feeder + primary jaw crusher + fineness jaw crusher + impact crusher(optional) + vibrating screen + belt conveying system + control system Proposal. 3: vibrating feeder + primary jaw crusher + Compound cone crusher + impact crusher(optional) + vibrating screen + belt conveying system + control system In the above proposals, the main difference is the secondary crusher: using impact crusher (hammer crushing principle), or using fineness jaw crusher(plate pressing principle), or Compound cone crusher(plate pressing principle). If the local market has not request of the stone shape, users prefer to use fineness jaw crusher, or Compound cone crusher as the secondary crusher. Because for high hardness stones, the quick wear parts cost of fineness crusher/cone crusher is lower than that of impact crusher. For jaw crusher and compound cone crusher, the working principle is plate pressing, so the percentage of stones with flaky shape, internal cracks is high.