For high-speed uniform grinding to analytical fineness of wet and dry samples, from rocks and minerals to ceramics and cement.
Negligible contamination The British-made GYRO MILL is the perfect choice for rapid, homogeneous and reproducible grinding of samples, both wet and dry. It is widely used in geological/mineral assay work for sample preparation as well as for wet chemistry and instrumental analysis, such as XRF spectroscopy.
Materials routinely ground by this method include brick, castings, cement, ceramics, chemicals, clinker, coal, coke, concrete, ferro-alloys, fertilisers, fluxes, glass, iron, limestone, minerals, paint, pesticides, pharmaceuticals, dried plant material, ore, precious stones, rocks, metals, sand, slags, silicates, soil, steel, wood...
The GYRO MILL is particularly recommended for grinding smaller samples from 1cc to 250cc. Typically, the maximum initial particle size is approximately 12mm, depending on hardness of the material.
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Features of Gyro Mill
- Large puck and rings result in high intensity grinding with high percentage of fines
- Easily adjustable grinding intensity/vibration amplitude control with three settings
- Variable, built-in process timer
- Accommodates the whole range of grinding dishes, of whatever manufacture, from the most fragile to the hardest
- Negligible sample contamination
- Cam clamping device allows rapid, simple loading and unloading of dishes
- Sound-proof cabinet
- Manufactured in the UK to the highest standards
- Timer switch, stop/start switch, overload relay and cover safety switches
- Three vibration amplitude settings
- Most samples ground to analytical fineness in 1 to 3 minutes
Grinding Intensity Control The GYRO MILL has a positive advantage over many other dish and puck mills in that the grinding intensity can be adjusted to one of three settings.
Amplitude adjustment ensures the best possible results, since it can be set to complement the special characteristics of the feed material, the fineness required, the wear rate of the dishes and the degree of contamination from the grinding dishes which can be tolerated. By selecting the optimum combination of amplitude and timer settings, precision particle size distributions can be achieved and reproduced.
Horizontal Grinding Action A further advantage is that it is designed to ensure a smooth, horizontal grinding action with minimal vertical vibration. The puck and rings are larger and have greater height than those in conventional dish and puck mills. Consequently, they avoid ‘bouncing’ off the lid and base of the dish in a vertical direction, minimizing excessive wear in these areas together with unnecessary sample contamination.
Working Principle The GYRO MILL uses a fixed-speed, standard motor coupled to a flexible drive shaft. Two eccentric weights mounted on the drive shaft transmit a horizontal gyratory vibration to the sealed grinding dish clamped into position on the mill. The vibration causes the puck and one or two rings in the dish to rotate freely, crushing the sample.
Grinding performance is easily controlled by a patented mechanism which adjusts the position of the eccentric weight in relation to each other, allowing three possible grinding intensity amplitudes. With maximum overlap of the weights (‘high setting’), the largest amplitude is achieved; with minimum overlap (‘low setting’), the amplitude is at its smallest.
|Feed Materials||Brick, castings, cement, ceramics, chemicals, clinker, coal, coke, concrete, ferro-alloys, fertilisers, fluxes, glass, iron, limestone, minerals, paint, pesticides, pharmaceuticals, dried plant material, ore, precious stones, rocks, metals, sand, slags, silicates, soil, steel, wood|
|Max. Feed Particle Size||12 mm|
|Mill Type||Disc Mill|
|Typical Grinding Time||1-3 minutes|
|Power Requirements||0.4kW 230V single-phase 50Hz or 400V three-phase 50Hz (Other voltages available upon request)|