The most common sand is composed of particles of quartz and feldspar. Quartz
sand particles are colorless or slightly pink, while feldspar sand has a pink or
amber color. Black sands, such as those found in Hawaii, are composed of
particles of obsidian formed by volcanic activity. Other black sands include
materials such as magnetite and humbled.
It has two types, wet mills and
dry mills. The machine could use different lining board according to product
requirement to satisfy different customer’s requirement. The milling fineness
depends on the milling time. The motor is started by the coupling which can
reduce voltage and lower the starting electricity. The structure is divided into
integral type and freestanding type. Advantages of the machine are lower
investment, energy saving, structure novelty, easy and safe to operate, stable
and reliable performance, etc.
The preparation of sand consists of five basic
processes: natural decomposition, extraction, sorting, washing, and in some
cases crushing. The first process, natural decomposition, usually takes millions
of years. The other processes take considerably less time.
The processing
plant is located in the immediate vicinity of the natural deposit of material to
minimize the costs of transportation. If the plant is located next to a sand
dune or beach, the plant may process only sand. If it is located next to a
riverbed, it will usually process both sand and gravel because the two materials
are often intermixed. Most plants are stationary and may operate in the same
location for decades. Some plants are mobile and can be broken into separate
components to be towed to the quarry site. Mobile plants are used for remote
construction projects, where there are not any stationary plants nearby.
The
capacity of the processing plant is measured in tons per hour output of finished
product. Stationary plants can produce several thousand tons per hour. Mobile
plants are smaller and their output is usually in the range of 50-500 tons
(50.8-508 metric tons) per hour.
In many locations, an asphalt production
plant or a ready mixed concrete plant operates on the same site as the sand and
gravel plant.
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