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Mikro ACM® Air Classifying Mills were invented by HMPS in the late 1960’s and are one of the most versatile types of size reduction equipment available in the market. These units while being capable of producing fine, medium and coarse grinds for a wide variety of materials for Food, Pharmaceutical, Chemical and Mineral industries, require very little maintenance over their life span. The basic design of these mills is the impact size reduction that is coupled with an internal dynamic classifier which controls the outlet (product) particle size via recirculating the coarse particles back into the grinding zone.

There are seven main factors which determine particle size distribution for the Mikro ACM® Air Classifying Mill. When varied, the rotor type and speed combined with the liner and hammer count affects the production of fines. The separator type and speed affects the top size of the product. And lastly, the airflow governs the throughput as well as top size and fines generation. With the endless available options a machine can be configured to process just about any material that is below MOH’s hardness of 5.

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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 wet material is fed through customized feeding systems into the grinding and drying section of the dryer's main body. The grinding rotor disperses the wet material into very fine particles and the fine particles are fluidized in the grinding chamber by temperature-controlled, hot gas coming in from the air heater.

The hot air (or inert gas) can be heated up to 650 °C and as the wet product is dispersed, it is reduced in size in the bottom section of the dryer. The system is kept under a negative pressure by the exhaust fan and the surface area of the product is increased enormously so that water (or other solvents) is evaporated instantaneously.

The dry and fine particles are conveyed with the gas stream to the top section of the dryer where a separator classifies the particles by size. Then the particles pass the classifier at the set cut point and are conveyed with the exhaust air to a powder air separating system like the cyclone, cyclone filter or cyclone scrubbers.

The Micron Dryer flash dryer retains a fluidized bed of product in the drying chamber to ensure a low level of adhesion of wet material on the inside wall of the drying chamber. Moreover, process parameters like classifier speed and outlet temperature can be adapted to control moisture content and particle size of the end product.

  • Ultra fine regular end product - Due to its specially designed dispersion rotor, our flash dryers are able to produce ultra-fine powders in one step from suspensions, slurries, pastes and dough, filter cakes or wet powders.
  • High evaporation capacity - Due to the combination of high ?T with a good dispersion of the wet product in the air, our flash dryers can evaporate large quantities of liquids.
  • Compact design - Compared to other direct drying technologies, the flash dryer requires up to 50% less space.
  • Multi-purpose - Filter cake or slurry, in the same machine. Therefore with the Drymeister-H unlimited mechanical dewatering is possible previous to the final drying stage.
  • Easy access  - Either for cleaning, inspection or maintenance inside the dryer, our flash dryers offers the best accessibility from the market, regardless which size.
  • Various systems available - Open, closed- and recycle system concepts.
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Legumes, Pulses and Protein

In recent years, a lot of effort has gone into developing alternate sources of protein and to get away from the consumption of red meat due to the negative health effects associated with its consumption. This is the basis of our discussion about the protein available in legumes and pulses.

What is a legume? A legume is a plant whose fruit is enclosed in a pod. Better known Legumes are alfalfa, clover, peas, lupines, and soy beans.

What are pulses? Pulses are part of the legume family, but the term “pulse” refers only to the dried seed. Dried peas, edible beans, lentils, and chickpeas are the most common varieties of pulses. Pulses are very high in protein and fiber but are low in fat.

Pulses do not include fresh beans or peas.

Although they are related to pulses because they are also edible seeds of podded plants, soybeans and peanuts differ because they have a much higher fat content, whereas pulses contain virtually no fat. As previously mentioned, pulses are high in protein and fiber and are low in fat, so they are an excellent choice for adding protein to the diet through a process called protein shifting.

So how is protein shifting or enrichment accomplished?

Basically, the process consists of taking the raw feed material and separating it into two fractions where one fraction has a higher protein concentration, and the other has a higher starch concentration. One method to accomplish this is through dry, mechanical milling and separation.

The process starts with the raw feed, which, in this example, has a 22% protein concentration, and through mechanical processing the feed is divided into two streams: one with a higher protein concentration of about 35%, and the second stream with a lower protein concentration of approximately 16%.

Of equal importance is the ratio of each fraction. The desired high protein fraction in this case is 1/3 of the total feed.

Because of recent regulations in trying to eliminate animal protein, vegetable proteins have become the primary alternative in a variety of products, including feed for livestock, fish food, baby foods, and other food protein enrichment applications.

The starch fraction can also be used in cattle feed and the food applications listed here. One of the major challenges with the mechanical process is to find an economically viable use for the starch fraction, since it typically is going to be 2/3 of the process output. I have listed a few applications it can be used for, like noodles, thickening agents, confectionery products, and animal feed.

There are a few common elements that must be mentioned when talking about pulses. Let’s start with the outer most layer: the hull. This is a fibrous material which is typically tough to grind, and the amount present in the feed will significantly affect the throughput of a milling system. This is why the de-hulling process is so crucial in providing clean feed material for the improved performance of the mechanical protein shifting process.

The protein and the starch come next. Where protein is relatively easy to grind compared to starch particles, which allows us to produce a product with the right amount of energy, the protein particles are reduced in size more than the starch particles. This will then allow the protein and starch particles with different particle sizes to be separated, concentrating the protein and the starch into different fractions.

If the process is elaborated upon, the first step is to grind the feed material followed by passing this ground material through a high efficiency air classifier where the material stream is split into coarse and fine fractions.

The fine fraction is protein enriched and the goal is to maximize the yield of this fraction while maintaining the required protein concentration.

Peas, which have a protein concentration of about 25%, can be processed in the manner described to produce a protein enriched fraction of about 55%.

This material is processed using a Mikro ACM Air Classifying Mill and an Alpine High Efficiency Multi-Wheel Turboplex Air Classifier . The combination of this equipment for size reduction and classification produces the highest yields of the protein and starch fractions.