Frequently Asked Questions

Got questions about International Innovative Technologies Ltd (IIT) and our vertical roller milling (VRM) machines, classifiers and powder processing products or services? 

We’ve covered the most frequently asked questions here.
If you need more information please contact us.

Q1. How does the energy consumption of an m-series mill compare with a ball mill?

Our family of m-series low energy consumption, non-captive bed VRMs are ideal for a wide range of powder processing applications.

VRMs are extremely energy efficient using the latest centrifugal milling technology to finely grind a wide range of products. These features, together with a non-captive bed, a profiled spreader plate and other design innovations, means that the size of the milled product remains consistent. Compared to traditional power-hungry and cumbersome milling processes such as ball milling and jet milling which take up valuable space, IIT m-series mills are compact and portable and versatile for a wide range of industries and applications.

Q2. What particle size can the m-series mill grind to?

The m-series can effectively mill a range of materials of various hardness from limestone to silicon carbide up to 9.5 on Mohs Scale to a very fine particle size thanks to rotation speed and modular design. Designed for low maintenance, heavy duty, hard-wearing materials are selected for key components when handling abrasive materials.

Q3. Is the m-series mill environmentally friendly?

The patented powder milling process employed in the m-series range of mills is based upon a centrifugal grinding mechanism meeting with the material flow path and roller pattern which maximises grinding efficiency. It therefore has an extremely small footprint for output capabilities. In essence, low electrical energy input relative to fineness and volume of powder output. Output can range from 1 to 50 tonnes per hour depending on feedstock, particle size requirement and number of milling units in configuration i.e. simplex to quad arrangements.

Q4. What is the best configuration for my needs?

Individual solutions depend upon the final application, but multi-machine configurations enable varied outputs ranging from 10 to 50 tonnes/hour dependent on number of core units in configuration. Contact us for more details about your particular application or fill in an Enquiry Form to access detailed technical specifications.

Q5. Can I check particle size during the milling or classification process?

IIT can demonstrate in-line particle analysis thanks to innovative partners Malvern. An advanced Malvern Insitec in-line particle analysis system can be integrated into all new systems if required. Also, in partnership with SWR, IIT milling systems can incorporate in-line mass-flow measurement.

Q6. How easy is it to operate an m-series milling system?

Very easy. Control systems are simple to use and easy to navigate. On board computers handle the milling process; accurate control of particle size distribution changes can be achieved by smooth operating adjustments to the rotational speed of the mill – providing true ‘one pass’ milling if required Full on-site training is given for all mills sold.

Q7. How much does it cost?

IIT mills benefit from easy transportability and typically very low cost installation without the need for expensive foundations or high energy electrical supply. For speed of installation the low mass mill and its associated control system package are mounted on sub-frame assemblies which can be easily transported between different process locations for maximum feedstock and operational versatility.

From milling of the raw material, through classification to bagging of the finished product there are massive economic advantages using our energy efficient systems. To discuss the economic advantages in more detail please contact us.

Q8. Can I try before I buy?

Yes. IIT has one of the most innovative demonstration and test facilities for powder milling in the world. Our in house demonstration and sampling plant allows you to see how efficient our machinery is for yourself using your actual product. Simply contact us to arrange a demonstration.

Q9. Can I buy a c-series classification system or m-series mill separately?

Of course you can. Our complete process solutions which integrate milling, classification and bagging are certainly economical and work together with great efficiency. What’s more, m-series mills, c-series classifiers and s-series cyclones can be integrated into your existing infrastructure separately as standalone units.

The c-series® along with our s-series® cyclone is integrated into a complete system including a conveyor fan, inlet rotary valve and finished product / oversize product bagging stations. The system is also available with a bulk bag discharging infeed hopper for product loading.

Our Project Engineering team provides a complete Project Engineering service and can help you decide the most cost effective solution for your business.

Q10. What about After Sales?

Are your products easy to maintain?Yes. The modular assembly of our M350 and M600 mills is designed for easy maintenance. Service exchange replacement of key components is easily undertaken within 1 hour, minimising downtime. Remote diagnostic capability enables our maintenance team can monitor machine performance and expedite equipment maintenance before any downtime occurs. Low cost, high durability consumable tooling keeps maintenance costs low.

Q11. I want a mill supplying to South America. Can you do that?
Yes. And most other destinations in the world too. Our strong supply partnerships such as Siemens, enables IIT to compete and operate on a global scale.
Q12. Can the m-series be used for especially hard materials?

Yes, the m-series is particularly suited to the demanding fine grinding requirements associated with aluminium oxide, silicon carbide and zirconia as well as fly ash and other different types of slag. See our hard abrasives section.

The latest rugged and durable version of the mill incorporates a number of special features designed to both reduce wear caused by hard materials and eliminate the dangers of contamination. These include a range of material options for the grinding rollers and rings, including abrasion resistant tool steels, high chrome iron and ceramic tooling.

In addition, the main grinding module body is now manufactured from heavy duty austempered ductile cast iron and internal wear resistant polyurethane coatings have been incorporated in the inlet and outlet feeds. A ceramic tile lining can also be used in the grinding module itself for effective long life wear protection and the avoidance of contamination.

Q13. I have different products to mill. Can I use the mill interchangeably for different products?
Yes. Modular assembly allows quick module disconnect from the main body of the machine for easy access to both modules and machine elements which enable ‘milled product’ changes without cross contamination. There are no product collection filters to clean.
Q14. What are the benefits of using the m-series mills in glass recycling applications?

The energy efficient operation of the patented m-series technology makes it ideal for the high yield conversion of glass waste into fine powder and other grades of material for use in recycling and industrial applications.

IIT milling equipment has recently been supplied to a leading Portuguese manufacturer for the conversion of a glass waste stream into valuable feedstock as part of its production process.

Q15. What m-series system options are available?

The m-series is available in a range of modular grinding options to meet the needs of different materials, particle size requirements and throughput volumes.

IIT’s latest M350 mill is specifically designed to accommodate an output capacity range of up to 4.5t/hr for single pass applications and 500Kg/hr for finer products requiring classification. In this way the mill provides a versatile and flexible solution for the effective size reduction needs of a wide range of bulk materials across the complete scale of hardness up to 9.5 Mohs. It is ideal for process validation, batch processing, research and development, material preparation and pre-processing routines.

The M350 and larger M600 family of mills are compatible with the processing needs of a wide range of minerals and other industrial products including glass, sodium bicarbonate, iron slag, sodium sulphate, limestone‚ zircon sand, silica sand, pet-coke, fly ash, and different types of blast furnace slag.

A twin mill system can provide greater flexibility and versatility for high yield powder milling applications. The twin mill configuration utilises two grinding modules operating in parallel from a common feed, for complete flexibility of material throughput and increased production outputs

To further increase the variety of fine grinding options available, grinding modules can also be arranged vertically in series for multi-stage milling required for the production of certain fine grades of material.

Q16. My products are potentially explosive. Can you supply fully ATEX rated milling equipment?
Yes. Where required, the mill can be supplied fully ATEX rated and can safely process flammable/potentially explosive substances and materials such as coal, petcoke, plastics etc.
Q17. Is it noisy?
Our mills are low noise due to soundproofing fitted as standard.