with a high percentage of hard rock
inclusions.
These units are used on a
significant scale in various coal mines
in China and southeast Europe,
where several large HHIs process
material directly from the pit wall
benches, while also crushing
overburden in the same operations.
The non‑requirement of a feeding
hopper enables customers to decide
according to their wishes to operate
with a natural buildup hopper or add
a steel hopper. Another use of these
feeder breakers is railroad unloading
stations at power plants or ports,
receiving coal directly from tipped
railcars.
Still compact, with low overall
height and easy to relocate, Hazemag
HHI-type models (Figure 2) cover
capacities of up to 4000 tph, accepting
a large feed of up to 3000 mm in edge
length and are able to crush hard
material. The Hazemag HHIs can
come on skids or without skids for
fixed or semi-permanent installation,
on tracks that are powered or
unpowered and free‑running and can
be coupled to a front-end loader or
dozer and pulled into position.
Hazemag roll crushers
(HRC) and HCS and HSS
sizers
Hazemag chooses roll crushers or
sizers mainly when it comes to higher
surface moisture content or if the
product contains a low amount of
fines. The capacity range of Hazemag
roller crushers and sizers goes up to
several thousand tph.
A HRC 0813 roll crusher was
delivered for crushing 130 tph coal
and petcoke respectively from
130 mm down to 95% -45 mm at the
new Holcim Baroso cement line in
Brazil. The roll crusher is driven by
2 X 45 kW and the gap between the
rollers can be adjusted hydraulically,
which permits easy adaption of the
product size to the daily operations’
need (Figure 3). The range of
Hazemag HRC roll crushers goes up
to several thousand tph.
Crushing in Hazemag HSS series
side sizers takes place between the
outward rotating rollers and the
associated crushing wall. Hazemag
side sizers are processing anode coke
in Russia. At the RUSAL plant
Boguchany, a HSS 0810 side sizer is
crushing 40 tph -500 mm down to
92% -60 mm, and in the RUSAL plant
Sayanogorsk a HSS 0610 produces
50 tph 80% -16 mm starting from a
feed size of 60 mm. In a cement plant
in Kuwait, a Hazemag HSS 0613 side
sizer crushes 180 tph of different coal
types from 200 mm down to 95%
-30 mm (Figure 4).
Hazemag HSI impact
crushers and HUV, HUM
and HNM hammer mills
If the surface feed moisture is limited
to a level of 5% and the designed
product size is in the range of 95%
-20 mm to 60 mm, the Hazemag HSI
impact crusher is the right choice. The
main advantages of this crusher are
low maintenance costs compared to
hammer mills due to an easy
geometry of the blow bars of an
impactor compared to hammers. This
directly results in lower costs of
spares but also permits the usage of a
higher percentage of the installed
wear mass. In addition, changing the
blow bars is much easier and hence
leads to shorter downtime.
For the power plant GRES-1, near
Ekibastus in the Pavlodar area of
Kazakhstan, Hazemag & EPR will
deliver a horizontal HHI 1525 impact
crusher for crushing coal from
Figure 4. Hazemag side sizer (HSS).
Figure 3. Hazemag roll crusher (HRC) with hydraulic gap adjustment.
January 2016
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World Coal
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51
