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Process equipment

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The controlled reduction of a material’s particle size by milling, grinding or micronising to achieve the required end product is a vital commercial process.

Whether particle size reduction is required as an economical means of improving solubility, to increase dissolution rates or to improve batch-to-batch consistency and performance, British Rema can offer a solution.

Our mills and micronisers are suitable for laboratory or industrial-scale production and are capable of manufacturing to the most demanding particle size specifications in chemical, mineral, metal powder, plastic and polymer processing applications.

All of our milling equipment is designed and constructed to ensure high performance, robustness and ease of maintenance. Selecting the most appropriate milling technology for a particular application is not always straight forward and the most appropriate answer might not be the most obvious; it requires experience, trials and an open mind. Our team are here to help with your milling enquiry.

You may be interested in reading our article on Mill selection.

Opposed Jet Mill

Opposed jet mills are a type of microniser used for the superfine grinding of a wide range of materials where other forms of mill are unsuitable, particularly in cases where the feed material is hard, already relatively fine, has a low melting point or where high purity products, without contamination, are required.

Material is ground by introducing compressed gas, accelerated to sonic velocity through a series of nozzles. An integral rotary classifier wheel controls the particle size leaving the system.

This single unit is capable of milling materials up to a hardness of 10 Mohs and enables accurate and highly controllable particle sizes to be achieved, typically with narrow size distribution. A range of mill sizes is available for throughputs ranging typically from 0.5kg to 2 tonne per hour with average particle sizes as low as 1 to 2 microns.

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Classifier Mill

The Classifier Mill is an integrated impact mill and classifier designed to provide two distinct grinding sections, one for raw feed and the other for semi-ground material that is returned by the classifier for further processing.

This feature provides improved grinding efficiency, whilst the integrated classifier simultaneously provides more control over the particle size distribution than is the case with a regular/standard impact mill. Available in a range of sizes, the mill is designed for throughputs typically between 1kg and 6 tonnes per hour and is capable of reducing particle size to below 10 microns.

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Ball Mills

Ball mills operate by introducing the material to be milled into a rotating vessel which contains grinding media (e.g. high-density balls or rods) and the material is ground by attrition through the tumbling action of the mill.

Slow rotational speeds combined with simple and robust construction make them ideal for grinding hard and abrasive materials as well as lower hardness materials at high throughput, where continuity of service, low maintenance and minimum downtime are a necessity.

Ball mills can be designed to operate continuously (fed at one end of the system and discharged at the other), or on a batch basis for smaller, or intermittent volumes. They can also be operated either on a stand-alone basis (‘open-circuit grinding’) or in conjunction with a classifier which returns oversize product to the mill for further grinding (‘closed-circuit grinding’).

Our range includes screen discharge and grate discharge designs.

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Impact Mill

The Impact Mill is a simple, versatile, high-speed impact grinder suitable for the milling of a wide range of low to moderate hardness materials.

This energy efficient mill can be equipped with a variety of internal stator and rotor configurations, enabling the unit to meet a wide range of applications, including pre-grinding, medium-fine grinding and de-agglomeration, suitable for milling finished product of 500 microns and below, with 10 tonnes per hour.

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Spiral Flow Jet Mill

Spiral flow jet mills are a type of microniser suitable for grinding hard and soft materials up to a hardness of 10 Mohs and producing powders from 1 to 20 microns.

Material is fed into a high-speed vortex within the shallow grinding chamber which is created by introducing compressed gas through a series of specialist nozzles. Material is then ground within the vortex and is drawn through the central fixed classifier once particles are at the desired size.

Interchangeable internal parts ensure the desired output specification is achieved. The principal applications for this mill type, which has no moving internal parts, lie in the field of pharmaceuticals and allied products, as well as speciality chemicals where sterile and contamination-free operation is essential.

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