River gravel is usually taken from the crustal movement experienced by the thousands of years ago after an ancient riverbed gravel ridges produce mountains,experiencing the impact of flash floods,water removal process of continuous extrusion,friction.Tens of thousands of years of tremendous evolution,they tormented waves of water will sport collision friction lost gravel irregular edges,smooth surface,SiO2 average content of 85%,the highest compressive strength of up to 300MPa or more,integrated hardness Mohs 7 degrees or more,compression,wear,good corrosion resistance,is an ideal raw material widely used in sand.

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