Rock Crushing Equipment

Crushing

The size requirement of the primary crusher is a function of grizzly openings, ore chute configuration, required throughput, ore moisture, and other factors. Usually, primary crushers are sized by the ability to accept the largest expected ore fragment. Jaw crushers are usually preferred as primary crushers in small installations due to inherent mechanical simplicity and ease of operation of these machines. Additionally, jaw crushers wearing parts are relatively uncomplicated castings and tend to cost less per unit weight of metal than more complicated gyratory crusher castings. The primary crusher must be designed so that adequate surge capacity is present beneath the crusher. An ore stockpile after primary crushing is desirable but is not always possible to include in a compact design.

Many times the single heaviest equipment item in the entire plant is the primary crusher main frame. The ability to transport the crusher main frame sometimes limits crusher size, particularly in remote locations having limited accessibility.

In a smaller installation, the crushing plant should be designed with the minimum number of required equipment items. Usually a crushing plant which can process 300 to 500 metric tons per operating day will consist of a single primary crusher, a single screen, a single secondary cone crusher, and associated conveyor belts. The discharge from both primary and secondary crushers is directed to the screen. Screen oversize serves as feed to the secondary crusher while screen undersize is the finished product (see Figure 1). For throughputs of 500 to 1,000 metric tons per operating day (usually 2 shifts), a closed circuit tertiary cone crusher is usually added to the crushing circuit outlined above. This approach, with the addition of a duplicate screen associated with the tertiary cone crusher, has proven to be effective even on ores having relatively high moisture contents. Provided screen decks are correctly selected, the moist fine material in the incoming ore tends to be removed in the screening stages and therefore does not enter into subsequent crushing units (see Figure 2).

All crusher cavities and major ore transfer points should be equipped with a jib-type crane or hydraulic rock tongs to facilitate the removal of chokes. In addition, secondary crushers must be protected from tramp iron by suspended magnets or magnetic head pulleys. The location of these magnets should be such that recycling of magnetic material back into the system is not possible.

Crushing plants for the tonnages indicated may be considered to be standardized. It is not prudent to spend money researching crusher abrasion indices or determining operating kilowatt consumptions for the required particle size reduction in a proposed small crushing plant. Crushing installations usually are operated to produce the required mill tonnage at a specified size distribution under conditions of varying ore hardness by the variation of the number of operating hours per day. It is normal practice to generously size a small crushing plant so that the daily design crushing tonnage can be produced in one, or at most two, operating shifts per working day.

Screening

The screen or screens in a small crushing plant should be oversized and of the four-bearing type if possible. Installed screens should be standard sized and, if multiple screens are used, all screen panels should have the same dimensions. The screen layout should be such that screen decks are readily accessable. Screens should be located for optimum visibility and required chutes should be designed with the maximum open area possible. To minimize the height of the undersize chute, discharge conveyors should be oriented along the long dimension of the screen. The slope of the discharge conveyor should be as nearly parallel to the slope of the screen as is possible. The utilization of rubber top decks should be considered due to the longevity of this material. The use of tall chutes should be avoided or, if absolutely necessary, should be provided with dead beds and cleanout ports. Spare screen panels should be provided with the original equipment since considerable time can lapse between ordering panels and actual receipt, particularly for rubber covered decks.

Conveyors

Although design calculations may indicate overcapacity, no conveyor in any crushing plant should be less than 0.5 meters wide and, in actuality, it is best to standardize on a minimum belt width of 0.67 meters throughout the crushing system. Design should be such that conveyor troughing and return idlers can be lubricated from one side. Barely are small conveyors designed and manufactured with walk-ways on both sides of the belt. In smaller installations some designers prefer to specify permanently self-lubricated idlers. The design of tail pulleys should be oriented toward ease of cleanup. The lowest point of any belt should be at least 0.6 meters above the floor. Rock deflectors or plows located immediately in front of tail pulleys above the returning belt can serve to prevent rooks from cycling between the belt and pulley thereby increasing belt life. In tunnels, beneath stockpiles, and in other locations below grade, provisions must be made to include the cleanup sumps and pumps. In addition, these locations should be protected from flooding. Counterweights and/or mechanical takeups must be positioned in accessable locations for ease of adjustments. Usually gravity takeups are preferred since they tend to be self-adjusting and minimize sideways belt movement. Conveyor layout must take into account wind direction and, for elevated conveyors, covers should be considered. Naturally, all conveyors must be equipped with emergency shutdown switches and all drives, sprockets, and gear trains must be provided with adequate guards. The emergency stop cable should run the length of the belt on the operating side. Conveyor interlock systems must be carefully designed and must be understood by all operational personnel.

In the recent past, conveyor equipment suppliers have indicated an interest in quoting completely engineered and prefabricated conveyor systems, rather than components only. The design engineer must carefully consider these packaged systems since overall costs can sometimes be considerably reduced using these pre-fabricated conveyors rather than custom designed assemblies.

There is a tendency in small plants to overlook or undersize the dust collection system. This can prove to be a serious problem and will usually result in the handling of very wet ore in the fine ore bin since the usual “quick fix” for a dusting problem is the installation of numerous crudely fabricated water sprays. It is best to consider spray locations at all conveyor transfer points in the initial design. It is usually difficult to precisely estimate the dusting problem which will be encountered and, consequently, a selection of interchangeable spray nozzles having different orifices should be supplied as original equipment.

Fine Ore Bins

Fine ore bins must be sized to provide the surge capacity required for continuous operation of the flotation concentrator. The usual configuration for plants processing 500 metric tons per day or less is a single cylindrical bin, 10 meters in diameter and 10 meters high, fabricated of rolled plate which is welded or bolted on site. This type bin is discharged through a slot which is approximately as long as the diameter of the bin. Under no circumstances should the discharge slot in the bin be less than 0.6 meters wide. A 1 meter wide slot the length of the bin discharged by a 1.25 meter wide variable speed conveyor has proven to be an excellent system. Even though this installation appears to be overdesigned, it will pay for itself the first time that the ore becomes wet and/or sticky. If the crushing plant and fine ore bin are in close proximity and if the typography is favorable, one conveyor can be eliminated if the finishing screen is located atop the bin (see Figure 3). In this design, adequate access must be provided for screen maintenance. For larger plant throughputs, from 500 up to 1,000 metric tons per day, a similar sized bin is adequate for a single line plant if the crushing installation is operated 6 days per week. In the case of a 1,000 metric tons per day plant having two 500 metric ton per day grinding lines, a duplicate fine ore bin should be supplied.

simplified 500 mtpd crushing plant

simplified 1000 mtpd crushing plant

simplified 1000 mtpd crushing plant with bin-mounted screen

  • mini jaw crusher (1)mini rock crusher (1) Sale!
    mini jaw crusher (1) mini rock crusher (1)
    The 1" X 2" 911MPEJAC12 Small Rock Crusher is designed to finely crush rock and stone like aggregates or your favourite ore type (gold, silver, copper, etc.) from 3/4” (20mm) feed size down to a D50 - 50% passing 50 Mesh (300um).  canada manufacturer This also correspond to a crushed products P80 size of 80% passing 1.5mm or 14 mesh. This small jaw crusher and its miniature opening gape of 25 mm X 50 mm, can easily adjust by hand. The CSS, known as the closed-side-setting, can be choked down to effectively pulverize the rocks you feed in. 6 month warrantyWith a short throw at fast 500 RPM, this small rock breaker acts as a quasi-sample pulverizer without the dust of your typical cheap hammermill, chain beating, impact crusher amateur prospector often fall for and purchase online. IN-STOCK
  • small jaw crusher (9)small jaw crusher (13) Sale!
    small jaw crusher (9) small jaw crusher (13)
    The 911MPEJAC23 is a Small Jaw Crusher of  2.25" X 3" manufactured to easily crush any rock from 2" (50mm) down to a D50 of 700 micron (28 Mesh) which also correspond to a crushed discharge P80 size of 80% passing 1400 microns or 14 mesh. The discharge opening (closed-side-setting) of this 55 mm X 75 mm "big-small crusher" you can adjusted with a wrench.canada manufacturer With a short throw at a quick 525 RPM (speed eccentric overhead), this small rock crusher can almost pulverize without dusting of your run-of-the-mill, chain beating, hammermill small prospectors often buy. This portable and lightweight (35 lbs.), is perfect for low volume metallurgical sample preparation or any small home laboratory a gold prospector would have in his garage.6 month warranty Crushing Rate:
    • from 2.5" rock to 3/8" product = 150 lb/hour
    • from 3/8" rock to 20 mesh product = 50 lb/hour
    • total from 2.5" to 20 mesh in 2 passes = 40 lb/hr
    IN-STOCK
  • Sale!
    The 911MPE-JAC34 or  3" x 4"  (75 x 100 mm) is our biggest Small Jaw Crusher.  Handcrafted in Canada, is designed crush rocks/ore of any type (gold, silver, copper, granite, cement, bricks, etc.) 3” (75mm) in size down to 50% passing its CSS closed side setting of 1/8".canada manufacturer With a 375 RPM overhead eccentric, and equipped of a 3 HP electric motor or 6.5 HP gasoline engine, this small primary rock crusher/breaker will quickly have your hard-rocks crushed to under 1/4" and be ready for secondary crushing. Use this jaw crusher ahead of a hammermill to preserve the life of that hammers and screens on the mill.6 month warranty This jaw crusher weighs in at 150 lbs. IN-STOCK
  • portable rock crusher (1)portable jaw crusher Sale!
    portable rock crusher (1) portable jaw crusher
    The 911MPEJAC34C-G/E is a 75 x 100 millimeter Hobby Miner's Jaw Crusher.  Its 3″ X 4″ gape will break to 50% minus 1/4" CSS and rocks/ore hosting gold, silver, copper or any recycle material such as magnets, granite, cement or bricks.  Is easily adjustable closed side setting goes from 3/8" to 1.5".canada manufacturer With a 375 RPM overhead eccentric, and equipped of a 6.5 HP gasoline engine (196 cc), this small primary rock crusher/breaker will quickly have your hard-rocks crushed to under 1/4" and be ready for secondary crushing. With a capacity of 200 pounds (100 kg) per hours, the 911MPEJAC34CG is a sturdy 200 lbs rock crushing machine, can stay in your garage, small mining claim/camp of follow you around in the back of your pickup truck.6 month warranty The 3" x 4" Small Miner's Jaw Crusher, comes with: Operating manual, a feed hopper, eccentric pulley, pre-installed and replaceable Manganese jaw plates. Select between a gasoline or electric motor at no charge.
  • small rock crusher (1)small rock crusher (2) Sale!
    small rock crusher (1) small rock crusher (2)
    The 911MPEJAC34CE is a 3" x 4" Rock Crusher that will crush to 50% minus 1/4″. It is easily adjustable closed side setting goes from 3/8″ to 1.5″.canada manufacturer With a 375 RPM overhead eccentric, and equipped of a 2.5 HP electric motor, this small primary rock crusher/breaker will quickly have your hard-rocks crushed to under 1/4″ and be ready for secondary crushing. With a capacity of 200 pounds (100 kg) per hours, the 911MPEJAC34CE is a sturdy 200 lbs rock crushing machine, can stay in your garage, Includes operating manual, a feed hopper, eccentric pulley, pre-installed and replaceable Manganese jaw plates. Select between a gasoline or electric motor at no charge.
  • terminator laboratory crusherlaboratory jaw crushers Sale!
    terminator laboratory crusher laboratory jaw crushers
    The 911MPEJC100-M/T Laboratory Jaw Crusher is engineered for rapid reduction of hard and brittle materials.
    • 4" X 5" (100 mm X 130 mm) Jaw Opening
    • Quick and easy to clean due to front door access
    • Stepless, reproducible gap-setting by hand-wheel
    • Manganese Jaw plates
    • Easy exchange of jaw plates and side liners
    • Modular infeed hopper: removable, with splash back protection, batch-loader or dosing plunger
    • External control box with start/stop
    • P80: < 2 mm
    • Standard 3 x 380 V/50Hz Motor (customizable)
    • Contamination-free crushing because of 4 different grinding tools
    • This Crusher will crush Minerals / ores / slags Cement / cement clinker / concrete Glass / ceramics / corundum Soil samples / sludges Coal / coke / drill coreeurope manufacturer Industrial waste
    A jaw crusher robustly constructed single-toggle type with one fixed jaw plate and one moving jaw plate. Designed for the smaller laboratory, or use by prospectors. It is capable of quickly crushing materials up to 85% of the jaw opening (125 mm x 100 mm). It is robust and long wearing and made of parts and materials easily serviced in a remote area. Toggle adjustment is by means of jacking screw. The crusher is supplied as a free standing floor mounted unit with the motor to the rear of the main body. Comes complete with dust extraction point (from the top of the machine), hinged inlet hopper and removable sample bucket.
  • impact crusher (8)impact crusher (10)
    impact crusher (8) impact crusher (10)
    The 911MPE-IC4000 is our high performance impact crusher or better known as Hammer Mill Grinder. canada manufacturerSpecially engineered to outperform those run-of-the-mill chain mills often falsely called hammer mills. This crusher is effectively a small scale replica of industrial impactors. In this rock crushing machine, rock is projected against the inner cage and shatters by impact.  At 1750 RPM, the AR-450 blow-bars throw the material to be crushed onto another set of abrasion resistant wear-plates. Its 3" x 3" feed inlet swallows rocks only to let them out after being reduced to 100% passing 1/16" (1.5 mm).6 month warranty For best performance and it is best to pre-crush the feed with a jaw crusher. At only 150 lbs, the 911MPE-IC4000 is an ultra portable BLOW-BAR TYPE impact crusher. The impact crusher can easily fine crush a feed of 3/4" at some 250 kilo/hr. The crushing cage on this impactor is about 5.5" inside X 14" x 14" Impact Crusher, no motor, no mounting frame (Baseline): $4,000 Impact Crusher as shown, with motor and mounting frame (As Shown - Option)
  • jaw liner platejaw crusher (6)
    jaw liner plate jaw crusher (6)
    Industrial Rock Crushers employ two planer crushing surfaces set at a small angle to each other and convergent downward. One plane is fixed and the other is pivoted either top or bottom allowing a reciprocating motion when pushed by a pitman-toggle arrangement activated by an eccentric drive.canada manufacturer The 3 common variations of the jaw crusher drive system are describe here. The Blake features a double toggle jaw crusher drive mechanism which gives relatively smaller movement at the receiving end of the chamber generating a powerful crushing action for large rock pieces. A refinement on the crusher illustrated is the use of a curved jaw plate on the swing jaw which renders the crusher non-choking. This curvature decreases the effective receiving opening but does prevent choking and thereby increased capacity. A high-capacity Blake has subsequently been manufactured which has a decreased crushing angle and several altered structural design details. This type of crusher is now more commonly installed unless the prime objective is to have a maximum receiving opening for hard and coarse feed.china manufacturer The single toggle jaw crusher is similar to the Dodge type in that maximum movement is at the receiving opening but in all other respects compares with the Blake type. The actual crushing motion is somewhat complicated consisting of vertical as well as horizontal components. The machine is popular for its simplicity, light weight, moderate cost and ease of adjustment as well as its high capacity and high reduction ratio. It is particularly applicable for portable crushing rigs. Its disadvantages are high wear of jaw plates due to the vertical component of movement and its vulnerability to bearing damage due to shock loading.
  • cone crusher (1)small cone crusher
    cone crusher (1) small cone crusher
    cone crusherThe 911MPEPYB600 is a small (24") diameter cone crusher is perfect for fine, secondary crushing in small operations. Ideal to re-crush rock discharging from a primary jaw crusher. Feed this short head cone crusher up to 35 mm (1.5") with a CSS closed side setting 3mm (1/8") to obtain a P80 crushed product in the 3 to 13mm (1/8" to 1/2") range. When crushing fine, the crusher's capacity is reduced to 5 to 20 TPH - The finer, the slower. A manganese-chrome mantle and concave, greased seal,  lube system with temperature control. Chrome-moly  main shaft and heavy steel casting main structure.
  • spring cone crushers (8)spring cone crushers (2)
    spring cone crushers (8) spring cone crushers (2)
    For finer crushing or reduction a Symons cone crusher the the norm. Symons are commonly used for secondary, tertiary or quaternary crushing. They do this by a different chamber design which is flatter and by operating at about twice the rotational speed of a primary-type gyratory crusher. china manufacturer One of the first cone crushers had a direct drive vertical motor mounted above the spider with the drive shaft passing through the hollow bored main shaft. With relatively high speeds of 480 to 580 rpm and small eccentric throw the machine produced a uniform produce with minimum fines. There are numerous Symons cone crusher manufacturers of modern crushers each promoting some unique aspect. The Allis Chalmers Hydrocone' selling point is its adjustability and tramp protection through a hydraulic support system for the headcentre. By merely adjusting the oil reservoir below the head centre the crusher setting can be changed while in full operation. Tramp metal causes a surge of pressure in this hydraulic system which is absorbed through relief valves and gas-bladder filled accumulator bottles which allow the headcentre to momentarily drop and return to its normal operating position when the tramp has fallen through.Symons cone crusher The Symons or Rexnord spring cone crusher is adjusted by spinning the bowl up or down manually or through hydraulic rams. A series of powerful springs give the necessary tramp protection. Several other manufacturers produce similar types and sizes of crushers but all follow the basic types described.
  • laboratory cone crusher (1)laboratory cone crusher (2)
    laboratory cone crusher (1) laboratory cone crusher (2)
    The 911MPE-TM-LCC21 Laboratory Cone Crusher grinds 19 mm feed to -10 mesh and grinding fineness can be precisely calibrated by easily rotating the adjusting ring. Custom cones are available in materials to suit specific applications. The Laboratory Cone Crusher is typically used in applications where there are space limitations or flat (plate-like) rocks are being crushed.canada manufacturer It weighs 273 kilos and comes with a 3 phase 60 cycle 3 HP motor as standard. A 1 phase and / or 50 cycle motor is available which must be specified at time of ordering. It has rugged, fabricated cast steel construction with reinforced joints and internal welds and joints ground and polished. The funnel can be easily removed by simply rotating and lifting up.
    • Crusher, with cone and mantel of alloy-1, fully hardened to Rockwell 60, 208/220/440/575 volt, 3 phase, 60 cycles, 5 HP motor1-year-warranty
    • Crusher, with cone and mantel of alloy-2, fully hardened to Rockwell 60, 208/220/440/575 volt, 3 phase, 60 cycles, 5 HP motor
    • Crusher, with cone and mantel of mild steel, case hardened to 1/8" depth Rockwell 60, 208/220/440/575 volt, 3 phase, 60 cycles, 5 HP motor
    Laboratory Cone Crusher Specifications
    • Grinds 3/4" feed to -10 mesh
    • Grinding finenesses can be precisely calibrated by easily rotating the adjusting ring
    • Custom cones are available materials to suit specific applications
    • Rugged fabricated / cast steel construction with reinforced joints and internal welds and joints ground and polished
    • One or two drawers are available (stainless steel also available)
    • Optional Dust extraction port
  • mini laboratory rock crusher (10)mini rock crusher (3) Sale!
    mini laboratory rock crusher (10) mini rock crusher (3)
    canada manufacturerIf you are looking for a low cost geology sample XRF crusher/pulveriser, the 911JAC12C Mini Portable Rock Crusher is the machine. With its 25 x 50 millimetre gape, is ingeniously made by its manufacturer to crush gems, geology exploration samples, rock chips, rocks and stones exceptionally fine your preferred mineral type. 6 month warranty Whether or not your rocks is ore and contains gold, silver, copper, etc., you feed it into the powerful rock breaker at 3/4” (19mm) feed size and you will obtain a crushed product with a D50 = 50 Mesh (50% Fully Dressed Mini Crusher has a modest 1” x 2” gape opening ahead of its jaw. The single toggle, closed-side-setting, can be changed using the easy to adjust hand-dial with which you can control the choke point down to efficiently pulverize rocks you feed in.
  • laboratory cone crusher (2)laboratory cone crusher (1) Sale!
    laboratory cone crusher (2) laboratory cone crusher (1)
    lab_scale_cone_crusher_hopper As you know, laboratory cone crushers hold a price that most consider high. An alternative is this lab scale cone-like high performance rock crusher. Our 55 x 75 millimeter 911MPEJAC23C Crusher is fabricated to crush anything hard, from quartz gold or to rare earth magnets, into fine powder. Feed this little crusher <2” (50mm) rocks to get a product P80 of 1400 microns (14 mesh). As your rock flows into the cone hopper into the crushing plates with feed cavity gape of 2.25” x 3”, it emulates very well the crusher obtained by a high price laboratory cone crusher. The single toggle and CSS can be adjusted with the twist of a wrench all the way down to just 1 mm. Just look at the sieve analysis performance curves below. 6 month warranty The 911MPEJAC23C's high-frequency overhead eccentric moved the crusher' short throw at 525 RPM to quickly pulverize all rocks without dust.  Unlike your common “econo chain-whipping impact crusher", you can work safely without noise or dust.canada manufacturer This small, cone crusher "work-a-like" can crush up to 12 kg per hours (25 lb/hr) of hard stones.  It is the perfect high grade gold ore pulverizer for all home mineral processors for small home laboratory type arrangement. The ground particles given by this crusher are commonly freely-liberated sufficiently and almost ready to pan or process over a shaker table for gravity gold separation. The footprint of this rock crusher is small at 16" X 24".
  • rock crusher for saleSmall rock crusher for sale
    rock crusher for sale Small rock crusher for sale

    For sale are the 911MPE-24, 911MPE-44, 911MPE-56 and 911MPE-6100 both Laboratory Crushers are designed for fast and efficient crushing of medium-hard rocks and ores. It is compact and of rugged construction for general laboratory or small pilot plant operations. These small Lab Crushers have a wide range of applications across many industries such as mining, metallurgical industry, coal, geology and chemistry.china manufacturer Advantages:

    • Simple structure, easy maintenance;
    • Stable performance and low noise;
    • Even final particles and high crushing ratio.

    1-year-warranty Select from:

    • 2.5" x 4" jaw opening 911MPE-24
    • 4" x 4" jaw opening 911MPE-45
    • 5" x 6" jaw opening 911MPE-56
    • 6" x 10" jaw opening 911MPE-610
  • jaw crusher8-12-jaw-crusher Sale!
    jaw crusher 8-12-jaw-crusher
    The 911MPE812 is a heavy duty 200 mm X 300 mm cast jaw crusher has a CSS of 15 mm to 50 mm (5/8" to 2") and is driven by a 7.5 HP electric motor. This jaw crusher is relatively light in weight at 300 Kg.china manufacturer
  • roll crusher for sale (2)roll crusher for sale (3)
    roll crusher for sale (2) roll crusher for sale (3)

    For sale with its 8 inch by 3 inch rolls, the 911MPERC8C is the finest laboratory double roll crusher China has. It is massive and of top quality! Crushing by the Double-Roll Crusher is primarily accomplished by compression and consist of two heavy metal rolls of equal diameter placed horizontally which are rotated towards each other at same or at different speeds. The rolls are mounted on heavy shafts. One of the rolls is motor driven while the other roll rotates due to friction. The gap between the two rolls is adjustable because of two reasons—the product size is determined by the size of the gap between the rolls and to compensate for wear.china manufacturer The rolls have narrow faces and are large in diameter so that they can squeeze sharply (nip) the large lumps. The roll surfaces of the Double-Roll Crusher are smooth. The materials to be crushed are fed from the top. As the rolls rotate they are nipped between them and get crushed by compression, and are discharged from the bottom. Compression crushing is extremely efficient, as energy is only used to crush those particles larger than the gap between the rolls. Fines are minimised because already crushed materials pass freely through the crusher with no further size reduction. The speed of rolls can vary but is fixed on this model. These machines give a reduction ratio of 4 to 1 with few fines. The double-roll crushers accept feed sizes up to 10 mm, though larger feed can be effectively handled in certain applications. The machine is protected against damage due to unbreakable materials like nut or bolts, by spring mounting at least one of the rolls. It retracts instantly when an unbreakable is encountered, then reverts to its original position once the unbreakable passes through the crushing chamber with no stoppage of the crusher. 1-year-warranty Advantages

    • Efficient for crushing of materials with moisture content less than 15%;
    • Even final particles, no flaky and sticky materials;
    • Excellent design and easy operation.
  • belt conveyor (1)belt conveyor (4)
    belt conveyor (1) belt conveyor (4)
    china manufacturerBelt conveyors used to transport minerals are to be found all around the world in a large number of surface and underground mining operations. The idea of using the conveyor belt is not new, indeed, the first bell conveyors were introduced at the end of the nineteenth century; the basic principles of operation have not changed. However, over the years the capacity rating of belt systems and the length over which material can be transported have increased very considerably, together with the power inputs, the size of components and the degree of sophistication. The ‘Rules of Thumb’ set out by McIntosh Engineering underline the advantage of belt conveying across the spectrum of operations. They state:
    • An underground mine is more economically served by a belt conveyor than railcars or trucks when the daily mine production exceeds 5000 tons.
    • As a rule, belt conveyor operation is more economical than truck haulage if the conveying distance exceeds I km
    • A further attempt to provide guidelines for the selection of forms of haulage on cost grounds can be found in the Conveyor Equipment Manufacturers Association (CEMA) publication. CEMA agrees with the second bullet point above and adds four other economic points.
    • Beyond 1 km distance, the ton-mile cost of transport by belt conveyor may be as low as 1/10th cost by haul truck.
    • Estimated operating maintenance cost per year for a belt conveyor is 2% of the purchase cost plus 5% of the belt cost.
    • Belt replacement is on average every 5 years for hard rock applications and up to 15 years for non-abrasive applications.
    • Well maintained conveyor systems can reliably operate at 90% or higher availability.
  • jaw crusher better than terminator
  • roll crusher (4)roll crusher (3) (1)
    roll crusher (4) roll crusher (3) (1)
    Our production size industrial roll crushers will crush up to 140 TPH depending on the model you select. china manufacturer Irrespective of the part which rolls may play in the future in their relation to the two extreme limits of size-reduction, there is no doubt that they have achieved for themselves a secure position in crushing products of intermediate sizes. This is partly due to their large capacity and low cost of operation. It is also due to the fact of their mechanical simplicity, which involves the principle of the toggle-lever in overcoming crushing-strains exerted by particles brought within the angle of nip of their surfaces. Since their revolving masses also serve to absorb their own “ peak-loads ” when properly fed, a moderate and fairly uniform application of driving-power is able to accomplish a considerable amount of effective work in splitting and shattering rock-fragments.
  • high pressure grinding roll (3)high pressure grinding roll (2)
    high pressure grinding roll (3) high pressure grinding roll (2)
    High-pressure grinding rolls (HPGRs) have struggled for acceptance into the hard-rock mining sector. china manufacturer CRITICAL HPGR PARAMETERS HPGR roll diameters typically range from 0.5 m to 2.8 m, depending on the supplies, and roll widths vary from 0.2 m to 1.8 m. The aspect ratio of the rolls also varies as a function of manufacturer. Typical HPGR throughput rates range from 20 to 3,000 tph, with installed motor power as high as 3,000 kW per roll. The roll surface is protected with wear-resistant materials, and it has been these that have traditionally stymied HPGR acceptance, but solutions are now in place. When operating an HPGR, the two most important operating parameters are
    • Operating pressure
    • Roll speed
    The two key operating parameters are inherently linked to the following:
    • Specific throughput
    • Specific pressing force
    • Maximum pressure between the rolls
    • Specific energy input
    Detailed descriptions of the derivation and formulation of the parameters are given in numerous texts, and as such, the following section provides only a precis of the critical formulas, with some examples of actual relationships from testwork.
  • vibrating feeder (1)vibrating feeder (4)
    vibrating feeder (1) vibrating feeder (4)
    Vibratory feeders are used in gravimetric feeding systems to handle solids with particles that are loo large to be handled by screw, rotary-vane, or vertical-gate feeders, or in operations where the physical characteristics of the solid particles would be adversely affected by passage through these volumetric feeding devices. The discharge flow pattern of a vibrating feeder is extremely smooth and thus is ideal for continuous weighing in solids flow metering applications.china manufacturer The vibratory feeder consists of a feed chute (which may be an open pan or closed tube) that is moved back and forth by the oscillating armature of an electromagnetic driver. The flow rate of the solids can be controlled by adjusting the current input into the electromagnetic driver of the feeder. This input controls the pull of the electromagnet and the length of its stroke. Vibratory feeders are well suited for remote computer control in integrated material-handling systems. The vibratory feed chute can be jacketed for heating or cooling, and the tubular chutes can be made dust tight by flexible connections at both ends. The vibratory feeders can resist flooding (liquid-like flow) and are available for capacity ranges from ounces to tons per hour.
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