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            [post_title] => Alpine RO Rotoplex Granulator
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With Alpine High Pressure Roller Mill products are produced with a precipitous granule distribution. The high pressure roller crusher is also called roller crusher or roller press.

The significant difference of high pressure roller grinding compared with compaction is that the press forces between the rollers are lower because no new adhesive forces need to be created.

The mill feed is transported to the most narrow gap by the counter rotating rollers through friction effects. Both rollers are pressed against each other using hydraulics. This milling force is transferred to the mill feed. Through selective contact of the individual granules are created at extremely high inner tensions which lead to fractures.

The use of the optimal milling force leads to compact mills with extremely low energy requirements. Because only the outer particles of the material bed have contact with the surface of the rollers, milling that is almost contamination-free is possible.

High Pressure Roller Mills are used in the cases of medium-fine crushing of hard materials such as ceramics, minerals from 5 up to 9 on the Moh's hardness scale, metals and metal alloys. High Pressure Roller Mills are used in continuous operation or in a closed circuit with screening machines or classifiers.

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The grinding air is injected tangentially via Laval nozzles in the nozzle ring into the machine. This causes a spiral jet of air to form in the grinding zone, from which the mill derives its name. A high pressure forms in the mill as a result of the spiral flow of air that can rise to 1 bar overpressure in operation without product. The integrated injector is charged with compressed air which ensures that the product is conveyed into the machine against the overpressure present in the machine. This, however, is associated with a considerable compressed air consumption, which can be as much as 30% of the total grinding air requirement.

The feed product circulates close to the nozzle ring and is thus intercepted repeatedly by the air jets exiting the nozzles. Comminution is the result of inter-particle collision caused by the particles flowing at different speeds in the nozzle jet. Comminuted material is conveyed along with the air to the discharge, the spiral flow subjects the particles to a classification: only fine particles are discharged, coarse particles remain in the mill.

Alpine® AS  Spiral Jet Mills are characterized by a special geometry of the mill housing in the area of the discharge, which contributes towards a finer classification effect and a sharp top cut.

The product also has an effect on the air flow within the machine: the more product there is in the machine, the more the spiral flow is braked and the lower is the centrifugal force and the coarser the end product. The relationship of the product to the classifying air flow rate is therefore the most significant parameter for setting the fineness of the spiral jet mill. In principle, different nozzle angles can also be used to achieve the required fineness values, whereby the complete nozzle ring must be exchanged in this case.

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Tire Pyrolysis


Vehicle tires are recyclable and the various components can be separated and reclaimed for resale. Tire Recycling, referred to as Tire Pyrolysis, has become an eco-friendly method to reclaim raw materials from used or damaged tires while reducing the burden on landfills. 

Carbon Black is a major component in most tires, consisting of up to thirty percent of the tire construction.  It adds strength, abrasion resistance and UV protection. Carbon Black is traditionally produced through the combustion of hydrocarbons like oil.  As fuel prices and demand for carbon black increases, tire producers search for alterative sources of “green” carbon black.

Pyrolysis is a process that begins with shredding old tires to extract most of the steel and fiber. The chips are then heated in an atmosphere-controlled vessel where gases are released and can be collected to be used as fuel. The solid material remaining has a high concentration of carbon black. It is then screened and run through magnets to remove any remaining fiber and steel. 

At this point the material is of little value, full of agglomerates and grit. Additional milling is required to produce high quality material of commercial value.

Hosokawa offers various mills specially suited for the abrasive characteristics of carbon black capability of producing a range of product particle sizes for pilot to large scale operations.

Mikro-ACM® Air Classifying Mill
• Grinds & Classifies to d90 = 20 ?m
• External coarse recycling
• Available in sizes from 1 to 600 HP

Alpine® AS Spiral Jet Mill
• Simple design with no moving parts
• Particle on Particle Milling to d90 = 15 ?m
• Available in sizes with up to 36″diameter chamber

Alpine® Fluidized Bed Jet Mill
• Particle on Particle Milling to d90 = 2 ?m
• Energy Efficient design
• Internal Classification for tight particle size distribution

Once processed through a Hosokawa system, the carbon black can be sold for various applications, most notably for tire production.