during the eighties sider began to be interested in the ...during the eighties sider began to be...
TRANSCRIPT
Sand/silicate reclaiming
Sand/silicate reclaiming plants
During the Eighties Sider began to be interested in the study of the
moulding process with sand/silicate and to the consequent
regeneration of sand. In 1987 it realized the first plant for the
reclamation of sand bonded with sodium silicate.
The continuous development of the technology in the following
years has carried today Sider Technology to plan and construct
systems allowing to reclaim till more than 90% of the used sand.
Sider Technology s.r.l. Viale Giovanni XXIII, 108 - 21015 Lonate Pozzolo (VA) - Italy Tel. +39 0331 661673 - Telefax +39 0331 661638 E-mail: [email protected]
Sider Technology
Rev. 2 - 31/09/09
The sand reclaiming process is subdivided in more steps:
The vibrating shakeout equipment crushes the sand blocks, in order
to turn them to grains or to very small size. Metallic parts, stones or
other foreign matters are kept by a screening surface and are
discharged through a pneumatically opened shutter
Sand coming from the shakeout is conveyed upwards through
suction. During such transport it undergoes, because of the speed, a
crushing and a rubbing of the grains
In the decantation chambers, a first separation and elimination of
dust is carried out
The dusted and treated sand is screened, leaving to pass the
definitively selected one to the successive phase
Through the hot-air fluid bed, the grains are heated and dried, in
order to favour the shattering of the silicate film covering them.
Afterwards the rubbing of the grains pulverizes the silicate film, whi-
le dust is removed and stored in the hopper of the proper sleeves fil-
ter
The sand is cooled uniformly in a heat exchanger with finned tubes
batteries before its definitive ensilage
A pneumatic propulsor, placed under the cooling-unit, conveys sand
to the usage point
In order to improve the quality and to optimize the silicate
consumptions, sand is treated for a last time in a final dust
exhausting group provided with an adjustable cascade system. In
such way also the residual fines together with dust produced during
the pneumatic conveyance are captured, and you obtain a sand with
eccellent granulometry features
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