Transportation and storage of silicon powder
by Lee Dora none
Silica particles are extremely
fine, compared with other powder materials, its specific surface area is up to
20000-280000cm2/g, about 50 times greater than the fly ash, about 50 to 100 times greater
than concrete. The production and applications of ultra-fine particles are the high-tech
in eighties. At present, there are already have Al2O3, zirconium oxide and other
magnetic ultrafine particles, silicon carbide, silicon oxide and other metal powder and alloys ultrafine,
can be used for precision ceramics, high-performance powder metallurgy, conductive
materials, magnetic sensors, transducer and other new materials. Therefore, the
ultrafine characteristic of silicon powder has a very important role on improving
and enhancing the properties of the material.
Condensed silicon powder in the gas, liquid, back
to the process of the phase change by the surface tension, form of different
sizes round pellets, and the surface is more smooth, some of them may be two or
more spherical granules stick coagulation in together. Doped silica material, this
tiny spherical body can play a smooth lubrication role, reduce the friction
between the particles, thereby improving the workability of the material, water
can be reduced, improve the material properties.
Due to the small proportion of silica fume heap,
big natural inclination, fluffy, easy to fly, shipping and unloading by the
container is not easy, and the packaging and transportation costs are expensive.
Currently, the form of countries on silica processing, storage and
transportation is various, generally packaging with the form of raw powder,
lumpy, beads in bulk, bags and others, silicon powder can also be made into the mud or mud paste with the right amount of water supply to
the users.
Bulk loading is generally transporting with a
covered or enclosed dump truck cement tanker. Bags loading are usually heavy 25kg, big bags loading can up to 300-500kg. Pocket generally use paper or
plastic. At present, Tangshan, Shanghai,
Taiyuan and other places in China, silicon
powder are mostly with double plastic bag, net weight 10-15kg.
In order to improve the transport efficiency of silicon
powder, some manufacturers taken densification measures. Such as some factories
in Canada, Sweden, the United States add water to silicon
powder slurry tank (water and silica fume are 50%). The mud made by Norway was containing 35% silicon powder, and directly delivered
to the concrete plant. In this way, the transport costs are lower, not dust
while handling, good working environment; easy pumping, high degree of
mechanization.
The method of silicon powder into a ball often used the traditional ball machine, Norway, Soviet
Union, Japan
and other countries have been reported. Use paper waste, silicon sodium, NaCl,
alkali or alkaline earth metal hydroxide and other solution or water as a
binder, the diameter of the made pellets is 5-25mm, are
generally as silicon powder iron raw material returned to the furnace. Pellet’s
own strength some rely on the adhesion of adhesive, some need to calcination.
In the late seventies, a number of suppliers used
efficient alkaline agents combined with silicon powder beads to produce concrete
admixtures. After 1982, beaded admixture has new development, Norway used different alkaline
agents, efficient alkaline agent and silicon powder bonded into different performance
beads admixtures for cement, concrete and other mineral ingredients large (including
low cement castable, etc.). This additive is extremely easy to use, can be
dissolved in water after decomposition. At present, some countries have also
developed this technology. Beaded silicon powder’s diameter is 0.5mm, its bulk density from the
original bulk silicon powder 0.2t/m3 increased to 0.6t/m3. It can make the
packing and shipping charges decreased by approximately 60%. Handling
efficiency increased, storage space and area reduced, also improve the working
conditions and environment.
Source:http://www.mhcmp.com
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