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In the area with infrastructure construction industry in rapid development, a great number of tailing will be produced owing to improper equipment utilization in ballast pit and sand machining production line. Pursuant to statistics, nearly 40% materials become tailing wastes during the operation of ballast pit and sand machining production line and these tailing wastes bring in great waste in material to developers. Another imperfection is that a large number of tailing are piled up on production site and they are even given to other industries for free with transportation cost paid by the owner.Four characteristics of tailing:
1. Bad particle shape  
2. Unreasonable grain composition 
3. High mud content 
4. Unsteady water content    
Aforementioned characteristics do not enable tailing to be used in construction engineering directly and induce sales difficulty, thus, the comprehensive value of tailing pile in crushing factory is low.
When Shenxiang Machine is researching and developing the technology of sand machining system, it also gives technological solution for tailing treatment that enables further production of several products in different specifications with tailing, finishes the shape and particle size of the tailing and endows tailing with value.