In the closed goaf, in the roadway leading to the goaf, a partition wall of a certain thickness is built, so that the impact waves generated by the collapse of the surrounding rock in the empty area can be buffered when the partition wall is encountered. This method is suitable for the condition that the empty area is not large and is far away from the main production area , and the lower part of the empty area is no longer subjected to the mining work . For processing large gap, only a sealing method auxiliary means, such as a closed tunnel communication and transport ore chute, pedestrian courtyards.

The closed method is used to treat the goaf, and the upper overburden should be allowed to collapse, otherwise it cannot be used.

Zinc Cut Wire Shot

Zinc Shot is a very common Metal Abrasive used on Aluminium die casting parts and Zinc die casting parts. Zinc shot has a similar density but lower hardness. It could clean the surface of some soft casting parts without any damage while steel shot can not. Compared with aluminium, it is heavier and safer when shot blasting. Benefit from these advantages, Zinc shot is widely used in metal casting industry for surface treatment.

Longlived Zinc Shot is made from high qiality zinc wire by drawing, cutting and rounding. There are five shapes of Longlived Zinc Shot and they are as cut, G1, G2, G3 and even G4. The size is from 0.25mm-3.0mm. Of course, customize is available according to your requirement.

Longlived metal abrasive make your shot blasting cheaper, faster and cleaner.

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