Supply Lines
July 2007
Getting into Shape
When it comes to meeting tight specs, it’s all about getting stone into the right shape. Find out how tertiary crushers can help.
by Therese Dunphy, Executive Editor
Impact Service Corp.
Large impeller shoes
As vertical shaft impactors gain acceptance in
secondary and tertiary crushing, Impact Service Corp. (ISC) offers its
Model 130 for applications with feed sizes up to 12 inches. The impeller
shoes and anvils, reported to be the largest and heaviest currently
available, are the primary crushing components. In one California
granite quarry, the crusher achieved 900 to 965 tons per hour on 10- and
12-inch feed size. The 87,000-pound (without drive motor) crusher
features a 130-inch crusher tub. Impeller shoes weigh 266 pounds each,
and impeller tables are available in three-, four-, five-, or six-shoe
options. A hydraulic lid lifter for easier access to the crushing
chamber is standard, while an anvil lifter beam is optional.
Fintec
Track-mounted cone
Fintec Crushing and Screening Ltd. rolled out
its Fintec 1080 track-mounted cone crusher system. The 385-horsepower
cone features high strength and high capacity with high-reduction
performance, all-in feed, and direct hydraulic drive. Fintec worked in
tandem with new owners Sandvik to combine its expertise in track-mounted
chassis designs with Sandvik’s crushing equipment. The plant features a
Sandvik 385 horsepower H3800 crusher, developed with Sandvik CSC
(cubical shape crushing) technique to produce high-quality material for
tight spec standards. With a hopper capacity of 6.5 cubic yards and a
maximum feed opening of 7-1/2 inches, the hydraulic-adjust crusher
allows a coarse closed-side setting (CSS) of 1/2 to 1-1/2 inches and a
medium CSS of 1/3 to 1 inch. Crushing chambers are available for extra
coarse to extra fine applications.
Sandvik
Tertiary or secondary crushing
The Hydrocone H7800 Crusher from
Sandvik Mining
and Construction can be adjusted under a full load in response to
specific production goals. Designed to replace 7-foot crushers, the unit
has a maximum motor size of 700 horsepower and is ideal for tertiary or
secondary crushing, according to the manufacturer. It can handle a wide
range of feed sizes from 12 inches to less than 1 inch, and closed-side
settings of 2 inches to less than 1/3 inch can be achieved.
The crushers’ intelligent automatic setting regulation system has color graphics and a touch-screen interface that allows the operator to track performance over time as well as maintenance items, such as liner wear. The crusher also comes with a built-in tank instrumentation monitoring system, and the constant liner performance-crushing chamber is standard. Seven crushing chambers are offered, from extra coarse to extra fine.
Durable Crushers Inc.
Rock-on-rock crushing
The Supercollider, from Durable Crushers Inc.,
is a vertical shaft impact crusher that crushes rock on rock. Unlike
other VSIs, the impeller is suspended below a large-diameter ball
bearing journaled in a housing mounted on an elastomer support; a hollow
spindle is journaled within the inner race of the bearing and extends
downward to be attached to the impeller by gunlock means. Within the
hollow spindle is a 12-inch-diameter tube that is attached to a hopper.
Rock to be crushed falls through the tube directly into the impeller
where it is accelerated to a high velocity as the rock exits the
impeller ports. A cup-shaped sheave bolts to the top of the spindle and
is driven by two opposed motors that are suspended by bases that can
pivot by push-pull hydraulic cylinders for balanced belt tension. At the
end of a shift, the belts can be relaxed for longer life. Two 250
horsepower motors are standard. One motor drives a small hydraulic oil
pump.
Terex Cedarapids
Improves particle shape
Terex Cedarapids MVP Rollercone Rock Crushers
offer high-production tonnages, improved particle shape, and reduced
wear costs. As a tertiary crusher, the roller bearings design of the MVP
provides a consistent product when making manufactured sand or asphalt
chips while using less energy. The MVP line is said to process a high
tonnage of material and to provide excellent particle shape for all
common aggregates. The crusher is available in four sizes with several
chamber configurations. The manufacturer reports that a patented tramp
iron relief system allows the unit to crush more material to size per
pass with less energy than other cone crushers. Hydraulic accumulators
store the hydraulic fluid during a tramp iron event close to the
cylinders to force the return to the original closed-side-
setting quickly and automatically. The hydraulic control system can adjust the setting while crushing to compensate for manganese wear in high-abrasive applications to improve performance on the circuit at all times.
Telsmith
Portable gyrasphere
Telsmith’s secondary/tertiary plants feature the Telsmith Gyrasphere cone in 36-, 44-, 52-, 57-, and 68-inch models. They are said to combine high capacity and low maintenance. Options include hydraulic relief (36- and 48-inch models only), unlocking, adjustment, and anti-spin. Diesel and electric power options are also available.
Crusher Rental & Sales Inc.
Large feed opening
Designed at the Crusher Rental & Sales, Inc.’s new state-of-the-art 45,000-square-foot facility, the Crush Boss Model 4156 horizontal shaft impactor boasts a 22- by 57-inch feed opening, four-bar rotor with reversible high-chrome blow bars, hydraulic lid opening and assisted anvils, and a 300 horsepower TEFC electric motor with V-belt drive. The unit is available as part of a closed-circuit plant.
KPI-JCI
Creates cubical product
KPI-JCI introduces the model 2500 vertical shaft
impactor (VSI) crusher to its existing line of impact crushers. Said to
set industry standards for producing cubical product at high production
rates and lower costs per ton, the VSIs boast an innovative design, as
well as rugged construction. The new unit joins the 1500, 82, 4500, and
120 models and is available in fully autogenous or standard
configurations.
McHale Inc.
Crawler-mounted portable crusher
The Mobirex MR 130 R and MR 130 Z, from McHale, Inc., feature hoppers ranging from 8 to 10 cubic yards. The impact crusher has a 52- by 36-inch feed opening and allows for adjustment of circumferential rotor speed and hydraulically actuated adjustment of the impact toggles. It features variable rotor speed of 480 to 650 rpm and is driven by a hydraulic motor via V-belts. Crushing capacity is up to 440 tons per hour.
Lovejoy, Inc.
Oscillating mounts
ROSTA oscillating mounts, from Lovejoy, Inc., are said to supply both acoustic and vibration isolation under the most harsh conditions. Their specially engineered design eliminates metal-to-metal contact or friction and isolates vibration that is often transferred to adjacent screen structures. These modifications provide operators with a low maintenance, long-life product, the company says. The mounts are available in various styles, including heavy-duty types AB 50, AB50-2-Twin, and AB-D (for shorter stroke systems).
Grasan
Custom-built support
Grasan designs and builds feed systems, crusher
support structures, and product-gathering conveyors for any brand, type,
or size of new or used tertiary crusher system, including new facilities
or additions and upgrades to existing facilities. The manufacturer
offers material analysis, product specification tests, and system
capacity checks, as well as flow charts to show how the system will work
— including all components and their production capacities.
Construction Equipment Co.
Customized plant
Construction Equipment Co.’s 400 Series Cone-It cone crusher plant features hydraulic cone adjustment and hydraulic cone clearing. It operates as part of the company’s Cone-It/Screen-It closed-circuit plant system and comes in two sizes — the 400 series and 450 series, the latter for higher-tonnage output, according to the manufacturer. The 400 series comes with several optional features to customize the plant for specific crushing needs. Both plants can set up in about two hours and provide finished products in large volumes, according to the manufacturer.
Metso Minerals
Mobile tertiary crushing
Metso’s track-mounted Lokotrack LT300GP, equipped with a GP300 tertiary cone crusher, can achieve production rates of up to 550 tons per hour. The mobile unit also offers a variety of optional feeding and screening equipment and is said to be the most efficient and flexible secondary/tertiary crushing unit in the market that can be transported from site to site as a single unit. It features robust construction for tough hard rock sites, and the crusher can be selected according to specific application requirements to achieve high capacity, top-end product quality, or low-wear parts costs.
Hazemag
Reduces generation of fines
The Hazemag APKV series tertiary impact crusher is suited to crush medium-hard, non-abrasive materials down to a cubical, well-graded product size of 0 to 1/2 inch (60 percent passing 4m) in a single pass. Due to its added control over the upper product sizes and high reduction ratios, it can efficiently operate in closed circuit on smaller product fractions.
McLanahan Corp.
Reduces generation of fines
McLanahan Corp.’s DDC-Sizer series as an
efficient means tertiary crushing of low silica materials such as
limestone. The DDC-Sizer is an evolution of the double roll crusher and
is ideally suited to handle wet, sticky feeds contaminated with clay
while producing a cubical product size due to the intermeshing teeth and
slow rotational speeds of the rolls. According to the company, the
primary advantage of this style of crusher is the significant reduction
of undesirable fines, maximizing product yields. With a low-profile,
low-headroom design, the DDC-Sizer is supplied with retractable wheels
at each corner so that it can be rolled out from under hoppers or chutes
for easier access during normal maintenance. Tertiary units range in
size from 24- by 48-inches to 24- by 96-inches. Capacities range from
600 to 1,200 tons per hour.
