What is the difference in the quality of high quality materials processing?

The choice of washing desks and chairs is still the need to wipe, probably according to the status of mud containing raw ore and sand surface quality pollution to decide. If the content of the original slime is less than 1%, the appearance of the sand is clean, usually by water mining and washing, the content of the mud in the silica sand can reach less than 0.3%. If the content of the original mud is at 2% or higher, and the pollutants on the surface of the sand are more, it is usually necessary to wipe the mud of the silica sand to reach the requirements of the resin sand or A hard sand. The classification of silicon sand particle size mainly includes hydraulic classification and mechanical selection classification, and its process and characteristics.

6. The desks and chairs in the classroom should be fixed. The chairs should be turned over.

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