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Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage grinding circuits
Grinding of materials in a tumbling mill with the presence of metallic balls or other media dates back to the late 1800's. Since that time, Metso
Minerals and its predecessor companies, MPSI, Sala, Marcy, Hardinge, Kennedy Van Saun (KVS), Denver Equipment, Allis Chalmers, Boliden
Allis, and Dominion Engineering, have designed and manufactured more than 8,000 grinding mills.
Metso overflow ball mill sizes range from 5 ft. x 8 ft. with 75 HP to 26 ft. x 41 ft. with 20,000 HP.
Normal feed size to a Metso Minerals ball mill is 80% passing 1/4" (6mm or finer) for hard ores and 80% passing 1" (25mm or finer) for soft ores.
Product size is typically 35 mesh or finer.
Operation
Ball mills operate either in open or closed circuit. Open circuit operation is best utilized when:
Another stage of grinding follows the mill
Reduction ratio is small
Feed material is already fine and one pass through the mill produces the desired results
Product size control is not critical and oversize material can be tolerated in the product
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With the proven use of gearless drive technology, the limitation of AG/ SAG mill size due to gearing constraints has been eliminated. Metso Minerals is the world's leading supplier of gearless AG/SAG mills.
The experience gained from installation and operation of these mills enables us to offer mills of up to 35,000 installed horsepower or more.
Today a single grinding line with a Gearless SAG mill and appropriate ball mills can process over 100,000 mtph.
Gearless AG/SAG Mills
Gearless drives (ringmotors) have been used on tumbling mills for several decades. The design features motor rotor elements bolted to a mill shell,
a stationary stator assembly surrounds the rotor elements, and electronics covert the incoming current from 50/60 Hertz to about 1 Hertz. The mill
shell actually becomes the rotating element of a large low speed synchronous motor. Mill speed is varied by changing the frequency of the current to
the motor. The ringmotor can be used to inch and spot the mill for maintenance.
Our engineers welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of the milling plant.
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... see all the products in the category
Mills
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Floor Saw Blades from TYROLIT and Floor Sawing Machines from TYROLIT Hydrostress - an unbeatable combination.
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As market leader with wall saw systems (tool and machine) TYROLIT listens to the customers and translates the requirements and whishes in the tool and machine.
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Among scrap processing techniques, shredding offers the greatest potential for quality scrap production. We at Metso Minerals know how every detail must be designed and carried out for efficient long-term shredder operation, based on our experience gained from supplying a large number of Lindemann shredder plants.
Our new generations of energy-efficient high-performance Power Zerdirators, Shredders and Kondirators have proven themselves, providing high plant availability and increased process flexibility.
Lindemann Shredders are available as single machines and turn-key plants. They can be used by metal recyclers, municipal waste incineration plants and non-ferrous metal remelting industry.
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Our motto is "Reliability in Conveying". It means we develop, manufacture and market conveyor components and accessories that increase the reliability of our customers conveying operations.
Trellex products increase up time, improve the environment and reduce the need for maintenance. They feature smart simple design that makes them efficient, rugged and maintenance friendly.
Our range includes systems for belt guiding, cleaning (scrapers, modular brushes, ...), conveyor hoods, loading stations, pulley & roller laggings, sealing systems, ...
Just check out the website to get to the full range and to download any brochures
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Sandvik has a highly skilled projects division specializing in the design, manufacture, installation and commissioning of complete conveyor systems for use in mining, power generation, port systems, grain handling and the full range of conveyor applications. In addition to designing new systems from scratch, we undertake upgrading projects to expand or optimize and modernize existing conveyor systems. Examples of turnkey installations delivered by Sandvik are given below.
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Highlights:
- Versatile through our distance plate up to Ø 500 mm and 5.2 kW power
- Precise working made easy thanks to our easy adjustable, low-wear steel-bronze guides
- Use the extension tracks if you need more penetration. Available from 230 mm up to 910 mm
- High-quality steel toothed rack paired with precise, integrated steel guides
- Wire Saw SK-B may be mounted on this drill stand
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Ranging from the extra heavy-duty stationary models to the most flexible feeders for mobile applications, Metso Minerals feeders offer minimum downtime and maximum tonnage for thousands of installations around the world. Our feeders feature a rugged yet flexible design, extra heavy-duty construction, exclusive vibrator technology and ease-of field-changes in grizzly opening and deck-slope.
Metso Minerals feeder series is designed particularly for continuous use with any hard and abrasive materials. They combine a robust frame design with
high feeding capacity and a limited overall height. These features make it ideal for operation in restricted space, and in both stationary and mobile plants.
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Overview of a Nordberg conveyor unit equipped with a dust cover.
Nordberg conveyors and conveyor/extractors are designed specially for the inclusion in stationary, semi-mobile and mobile applications particularly under screening plants.
These conveyors incorporate rigid construction for fully-assembled delivery, fit in container for easy transport and include belt widths precisely according to your conveying needs.
Our conveyors can be quickly installed, provide high availability and adaptability and require minimum maintenance.
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Ranging from the extra heavy-duty stationary models to the most flexible feeders for mobile applications, Metso Minerals feeders offer minimum downtime and maximum tonnage for thousands of installations around the world. Our feeders feature a rugged yet flexible design, extra heavy-duty construction, exclusive vibrator technology and ease-of field-changes in grizzly opening and deck-slope.
Metso Minerals feeder series is designed particularly for continuous use with any hard and abrasive materials. They combine a robust frame design with
high feeding capacity and a limited overall height. These features make it ideal for operation in restricted space, and in both stationary and mobile plants.
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The Metso Minerals VF froth pump has been designed to increase the pumpability of frothy suspensions. The principle of operation is similar to that of hydro- cyclone separation.
Air is separated from the slurry in a vortex created by the impeller rotation and the tangential inlet to the pump ’s conical sump.This results in more efficient pumping at higher capacities and a smooth operation, free from pulsations caused by airlocking.
Summary of design features
Integrated unit for layout flexibility
Smooth operation of the open vortex created in the sump and vertical "wet end" inlet prevents air locking
Cantilever design does not require submerged bearings or shaft seals
Bearing assembly with double protection sealing
arrangement to prevent ingress of slurry
Wear parts are available in a variety of different materials
Simplified maintenance
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Sandvik RBF-series belt feeders can be assembled in various ways to match the application exactly due to their modular structure . Available with ten belt widths from 650-2400 mm and in lengths from 1.5-15 m, they are designed for applications with capacities up to 2600 m3/h. The RBF-series belt feeders suit for materials that have at least moderate internal cutting properties such as coal, lime, Fe-pellets, metal concentrates and different rocky materials.
Sandvik RBF-series belt feeders have wide and adjustable capacity range while they are reliable, silent, steady and have low raise of dust. Due to the adjustable and controllable output the RBF-series belt feeder can be used in applications where accurate feeding is needed.
Sandvik RBF-series belt feeders are easy to assemble, install and operate. With a wide range of standard modules and components they can be tailored exactly to meet the application requirements. At the same time, they are versatile, easy to adapt and easy to service.
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Metso Minerals delivers the world's most comprehensive range of conveyor belts. Based on more than 100 years of experience in development, manufacture and applications know-how, Trellex belts and belt systems are designed to meet specific end-user requirements for high performance and cost-efficiency.
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The Metso Minerals VF froth pump has been designed to increase the pumpability of frothy suspensions. The principle of operation is similar to that of hydro- cyclone separation.
Air is separated from the slurry in a vortex created by the impeller rotation and the tangential inlet to the pump ’s conical sump.This results in more efficient pumping at higher capacities and a smooth operation, free from pulsations caused by airlocking.
Summary of design features
Integrated unit for layout flexibility
Smooth operation of the open vortex created in the sump and vertical "wet end" inlet prevents air locking
Cantilever design does not require submerged bearings or shaft seals
Bearing assembly with double protection sealing
arrangement to prevent ingress of slurry
Wear parts are available in a variety of different materials
Simplified maintenance
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Sandvik RBF-series belt feeders can be assembled in various ways to match the application exactly due to their modular structure . Available with ten belt widths from 650-2400 mm and in lengths from 1.5-15 m, they are designed for applications with capacities up to 2600 m3/h. The RBF-series belt feeders suit for materials that have at least moderate internal cutting properties such as coal, lime, Fe-pellets, metal concentrates and different rocky materials.
Sandvik RBF-series belt feeders have wide and adjustable capacity range while they are reliable, silent, steady and have low raise of dust. Due to the adjustable and controllable output the RBF-series belt feeder can be used in applications where accurate feeding is needed.
Sandvik RBF-series belt feeders are easy to assemble, install and operate. With a wide range of standard modules and components they can be tailored exactly to meet the application requirements. At the same time, they are versatile, easy to adapt and easy to service.
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Metso Minerals Attrition Scrubbing machines are simple, yet highly efficient units for scrubbing particles at densities of 70 - 80% solids.
Two opposed Helix type propellers on each shaft force particles against each other, resulting in intense scrubbing, polishing and disintegration. Efficiencies generally increase with and increase of the density of the pulp, as particles have more frequent grain to grain contact. The twin propellers, mounted on a shaft inside a tank, are supported by a heavy-duty steel structure. Shafts are coupled to either gearbox or spindle bearing drives. An opening in each cell partition allows pulp to flow through the machine. Machines are usually supplied with two, four or six cells, with each cell ranging in volume from 4 to 9900 liter’s. (1cubic foot to 359 cubic foot). Odd cell arrangements are also available as custom supply
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Metso Minerals (as Sala Maskinfabrik AB, later Sala International AB) has a long tradition in magnetic separation. Already in the end of th 19th century "Sala" built the first magnetic separators.
Metso Minerals LIMS - dry and wet low intensity magnetic separators
Low intensity magnetic separators, LIMS, are designed to recover ferromagnetic materials. The separators are available in designs and sizes to provide solutions for all applications. The heart of each separator is the magnetic system with its unique design, which has a proven record of highest efficiency.
Metso Minerals HGMS - high gradient magnetic separators
High gradient magnetic separators available in cyclic design with process vessel diameters from 220 mm to 3 050 mm and in continuous design with matrix ring mean diameters 1 200 mm, 1 850 mm, 2 500 mm and 3 500 mm.
We are the OEM (original equipment manufacturer) for equipment manufactured under the following brand names, and is the only supplier of parts with the original drawings and design details for:
Metso Minerals, Denver, Svedala, Sala Maskinfabrik and Sala International LIMS and HGMS
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