Modern sand crusher experience trails and errors

This new type impact crusher is widely used all over the world in recent 20 years. It has been proved that this series of crushers can effectively increase productivity and final product quality. And they can also greatly reduce the investment costs and operation costs. Incomparable excellent performance is shown in the secondary crushing, tertiary crushing and material recovery.
Impact crusher is widely used in stone crushing
plant and sand making production line for construction building materials.
It can crush big stones or rocks such as quartz, basalt, shaly, kaolin,
limestone, marble etc into small size for building aggregates or manufactured
sand.
With economic development, the state strong support infrastructure such
as railways, highways, bridges, hydroelectric project construction, the
construction of the project can not be separated from the sand and gravel
aggregate, general infrastructure projects, if with less material can be
directly from the sand quarry procurement. The vast majority of large-scale
projects such as railways, highways, bridges, hydropower project, located in the
mountains or deep valleys, construction sites, narrow, tight construction
period, large amount of concrete works, the high strength of concrete
construction, strict requirements on the quality of the mechanism sand
aggregate. Excellent mechanism sand equipment with modern levels of technology
and dynamic economic indicators and mechanisms of sand production line design to
ensure that the project will require grading mechanism sand aggregate, in the
regulation of the whole project during the construction period dynamic balance
of production and supply is the fundamental purpose of the mechanism of Sharjah
plant design.
The trials also established that a cheaper and more effective
drilling method had to be adopted. It was decided to develop a horizontal method
to drill through the centre of each concrete layer, which allowed the heavy
rebar at the top and bottom of each layer to be avoided. In the end, Safedem
decided to use a Sandvik Commando rock drill machine that was adapted to allow
it to drill horizontal holes to a depth of up to 4 m (13 ft). This created
another challenge - how to load the holes with explosives. As a result, the
charges were pre-assembled in a heavy duty 38 mm (15 in) diameter, 1 m (3.3 ft)
long polythene tube. Each charge consists of perunit and amoblast with a charge
weight per hole of 1.2 kg (2.6 lb).

However Safedem developed an in series 300 millisecond delay detonator
connection between up to 10 20 hole sections, allowing up to 250 kg (550 lb) of
charge weight to be detonated over a 3 second time period. A series blast of ball mill10 sections produces
upwards of 1,500 m3 (53,000 ft3) of concrete debris.