River Gravel Sand Making Machine

River Gravel Sand Making Machine(http://www.greatwallcrusher.net/product/VSI-Vertical-Shaft-Impact-Crusher.html)

River gravel is a natural stone , taken from the crustal movement experienced by the tens of millions of years ago after an ancient riverbed gravel ridges produce mountains , experiencing the impact of flash floods , water removal process of continuous extrusion, friction. In tens of thousands of years of tremendous evolution , they tormented waves of water will sport collision friction is lost gravel irregular edges, and they were buried in silt an underground millions of years of silence .
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River pebbles main chemical composition is silicon dioxide , followed by small amounts of iron oxides and trace amounts of manganese, copper, aluminum , magnesium and other elements and compounds. They themselves have different colors, such as crimson by iron , copper blue by purple by manganese, silica gel yellow translucent chalcedony , emerald green color with minerals , etc. ; Because these ions dissolved dioxide pigment silicon hydrothermal different in type and content , thus showing shades , ever-changing shades of color , so that river pebbles showing black, white, yellow, red , dark green, schungite other colors . Near the Haihe river pebbles mostly rely on river pebbles gathered black sand , pebbles should account for more than half of the volume , because of its wide distribution , the more common , and appearance, so the ideal garden , road , construction of stone selection.

River gravel, is a hard, wear-resistant, chemically stable silicate minerals, natural...