High Capacity Grate Discharge Ball Mill Machine Beneficiation
The grate ball mill is usually used in the first segment of the two
stages, or place of discharging the rough ore.
The grate ball mill is roughly composed of the cylinder, cylinder
liner,big gear ring, discharging grate,and ore feeding device.
Except there is a discharging grate plate installed at the
discharging end, all the other is similar with the overflow ball
mill. The grate ball mill discharging cover head and grate plate
have the structure as the drawing: grate liner, bearing inner
cover, hollow shaft, dustpan liner, central liner, rib and wedge
In the head cover of the hollow shaft of the discharging end, it
has bearing inner cover and discharging grate installed and the
later is made from central liner, grate liner and dustpan liner
etc. There are eight radial rib casted on the inner wall of the
head cover, which divide the head cover into 8 fan rooms. There
installed the dustpan liner inside each fan shape room, with the
bolt fixed on the end cover. Finally the grate plate are installed
on each fan room shaped by the dustpan liner. The grate liner has
two kinds of structure: one is the group formed by two pcs, pressed
by the wedge block, which get fixed tightly on head cover with the
bolt getting through the rib. The central part are supported by the
central liner to prevent them from declining and dropping off. The
other kind is get two pcs into one block, fixing with bolt
directly. The central liner is star shape, formed by two block,
tightened on the rib with the bolt.
The hole on the grate liner is arranged at inclining direction. The
wideth of the hole is getting bigger gradually to the discharging
end, which can prevent the slurry from regorging and rough
granularity from blocking. The slurry flow into the fan shape room
through the hole on the grate plate from the lower part of the
discharging end, and get passed up to the upper part along the
cylinder rotating and discharged off the hole path. The hollow
shaft neck has the grinding proof inner cover, with one end made of
trumpet shape blade to lead the slurry to flow out of the mill.
As the slurry in this kind of mill is discharged through the grate
plate, it is called the grate ball mill.
This ball mills, a horizontal type and tubular running, has two
warehouses. It runs along the outside gear. Materials spirally and
evenly enter the first warehouse along the input hollow axis by
input devices. In the warehouse, there is a ladder scale board or
ripple scale board. Steel balls of different specifications are
installed in the scale board. When the barrel body rotates,
centrifugal force is produced. At the same time, the steel balls
are carried to some height and then fall to grind and strike the
material. After being grinded coarsely in the first warehouse, the
material then enters into the second warehouse for regrinding. In
the end, the powder is discharges by output material board.
1. The fast discharging speed, and high production capacity( 20~30%
higher than overflow type, and so does power saving )
2. Less overgrinding phenomena--discharging at the lower horizontal
level. Less slurry stored inside. And easy to discharge the grinded
fine particles in time.
3. Much ball loading- not only big ball but also small ball, for
the grate fence. Having the good grinding condition.
4. The complicated structure than overflow---multi grate fence,
taking certain room and reducing the effective volume.
The grinded material are carried by the discharging grate plate in
the grate ball mill, which has the compelling function, and fast
discharging speed. The slurry level in the discharging end is lower
than that of the lowest mother line level in the discharged shaft
neck, so it is called the ore low level discharging. The mill has
height difference from the material input end to the output end,
and the slurry get through the mill with faster speed, discharging
the grinded particles in time. As little slurry stored in the grate
type ball mill and blocked by the grate plate, the mill can load
more balls, easy to load the small ball. When the steel ball
dropping off, the striking function lessened by the slurry
resistence will be less. These causes make the production capacity
and efficiency is higher than that of the overflow mill, with rough
granularity finished product and not easy to get overcrushing.
|Feeding size(mm)||Discharging size(mm)||Capacity (t/h)||Motor power(kw)||Weight (T)|