... and with good uniformity. 4. Environmental protection, this is airtight system, and dust almostly not excape, rust environment fresh, eliminate pneumoconiosis ... only need 0.5-0.7T sand, and can be recycle. 7. The one-time investment is small, only about ... wall automatic shot blasting machine advantages: 1. Automatic closed circuit recycle system, less sand input, and not lose. Input volumn about 1000kg ...