• if the mix has high bulk densities,
• if the materials to be mixed flow poorly, then the mixing tool must apply increased drive torques because they are particularly fine, for example, or because they may be wetted with a liquid
• when the mixing tools rotate rapidly
• if the mixing process takes a long time
• when there are large batches in the mixer
• when large mass flows are mixed in the continuous mixer
• if the distribution of liquid additives in the powder is difficult
• when agglomerates are deagglomerated
• when atmospheric mixed drying or vacuum mixed drying takes a longer period of time
• when build-up granulation takes place
• …..

Answer from amixon®: Yes, many amixon® mixers work in the rough operating practice of the hard metal industry and are particularly appreciated there,  

• when the highest mixing quality is required
• if the mixing process is to take place at low peripheral speeds
• if the mixing time should be short
• if the batches are large; for example 5 m³ or 10 m³ or 20 m³ and more,
• when bulk densities are particularly high; for example 3 kg/dm³ or even 5 or 6 kg/dm³
• if the mix is damp or wet
• if the mixes are difficult to mix

Answer from amixon®: Four factors are decisive here: amixon® mixers deliver ideal mixing qualities that cannot be improved in practice.

1. The main mixing tools of the amixon® machines work at low peripheral speeds. Sometimes the peripheral speed of the mixing tools is less than one meter per second. Then the relative speeds between the mixing tool and the material to be mixed are also low. This reduces wear and saves energy.
2. amixon® mixers work particularly efficiently and guarantee short mixing times.
3. The mixing tools of the amixon® mixers are smooth and have a simple shape. In this respect, a wide variety of "wear protection armor" can be easily applied.
4. The main mixing tools of the amixon® mixers are only driven and supported at the top. The shaft seals are also only at the top – above the mixed material. In this respect, the seal is less stressed and permanently gas-tight.

Many of our customers praise the fact that they are able to carry out wear-resistant "weld armouring" on the amixon® mixer themselves. This is easy to organize and particularly inexpensive. Large inspection doors facilitate repair work without having to dismantle mixing tools.

Experienced amixon® service staff will be happy to visit you - almost - anywhere in the world. On request, amixon® will be happy to arrange training and upgrade your repair staff (f/m/d).

Answer from amixon®: Our experience from four decades shows that six different solutions ensure good protection against wear. The components that are subject to wear can optionally be protected as follows:

1. The mixer/reactor consists of a particularly wear-resistant base material.
2. The components subject to wear are hard-faced by hard alloy hardfacing. Ultra-hard tungsten or chromium carbides are embedded in the weld metal.
3. Replaceable wear protection elements are screwed into the mixer/reactor. These are high-strength ceramic materials that cannot be welded.
4. The mixing tools are armored particularly hard. An aluminum oxide ceramic is applied in the form of plasma spraying or in the form of high-temperature flame spraying.
5. The mixing tool and optionally also the mixing chamber are equipped with Widia hard metal plates (soldered or glued).
6. The mixing tool and optionally also the mixing chamber are equipped (glued) with high-performance ceramic plates.

Answer from amixon®: Here we suggest that the mixing space and mixing tools are coated with a suitable oxide ceramic. This works very well in practice. 400 liter mixers are available for tests in the amixon® technical center. All parts that come into contact with the product are coated with a high-performance oxide ceramic. Metallic abrasion is excluded during mixing/reacting/drying.

The test apparatus has a usable volume of 100 liters. The device is completely ceramic coated. In this respect, any metallic contact with the mix is prevented.  But the special feature lies in the construction details. The pressure in the mixer can vary  

• of 6 bar (pressure)
• up to 10 mbar (vacuum)
• The mixing room can be heated up to 350 °C

It is interesting that this test apparatus is gas-tight despite the high temperatures (up to 350°C). It is equally gas-tight in both vacuum and overpressure.