Sand Gravel Processing

Currently, much of the world is deficient in igneous rocks; at the same time has significant reserves of gravel-sand mixtures.

Processing of the gravel-sand mixtures is a technological challenge, different from the processing of rock produced by the explosion. The initial rock mass has a high percentage of fine particles and of the line depends strongly on the initial characteristics of the product and the ultimate goal of processing.

With the stone crushing and screening equipment may be allowed to do SBM problem of producing high-quality aggregates:

In the gravel and sand mixtures processing, crushed stone of high quality is the real figures operation of crushing and screening lines SBM (based on the centrifugal impact crusher) optimal for processing working with the following indicators:

The quality of cube-shaped crushed stone produced from sand and gravel mixtures

NO.	Product	Remains on sieve	Size of sieve, mm
NO.	Product	Remains on sieve	40	-20	-10	-5	-5
1	Initial	Private	20,9	56,2	14,9	7,9	0,1
1	Initial	Full	20,9	77,1	92	99,9	100
2	Granulated	Private	6,4	34,1	30,3	14,9	14,3
2	Granulated	Full	6,4	40,5	70,8	85,7	100

Fraction	-20+10 mm	-10+5 mm
The content of the grain in the product flakiness	5%	6%
The contents of crushed grains GOST 8267-93:	95%

Getting the cubic gravel from the sand and gravel mixtures

To obtain a natural stone in the middle of the unit fragmentation, vibrating feeder with a grate, which is paired with an aggregate of sorting allows obtaining two groups of natural products: 0-5mm (sand) and 5-20 (gravel). For recycling used rocks aggregate fine crushing Cone crusher centrifugal shock and the sorting unit crash. The output is 0-5mm dropouts and gravel fractions 5-10 and 10-20mm.

One of the problems of obtaining quality fine gravel is ineffective or impossible to obtain high-quality gravel with conventional jaw crusher and cone crushers due to the high content of uncrushed grains: much more than 20% regulated by GOST.

When using vertical shaft impact crushers VSI5X almost all source material shall be destroyed. This leads to a high-quality gravel from gravel containing uncrushed grains of 2-4% when the content of grains less flakiness 8-13%.

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