Agglomeration Technologies of Processing Powder Wastes

Abstract

This article deals with the presentation of modern applications for processing powdered, primarily hazardous, waste to an agglomeration form appropriate for subsequent processing by classical methods, for example in the construction, automotive and consumer goods industries. The aim of the research work was to set appropriate operating conditions in order to appreciate currently non-processable wastes resulting from the intensive production of often extremely expensive materials. Technologies which enable returning powder waste back into the primary production cycle were developed and experimentally tested, thus saving raw material resources. When necessary for the fixing of fine airborne particles with a problematic compacting curve (hard to compress, repulsive due to the surface charge) extrusion processes using a patented technology enabling controlled modification of shear forces in the extrusion zone were successfully applied. A new type of axial extruder allows the elimination of the liquid phase and as a result prevents the clogging of the extrusion chamber. In the case of need for granulation of sensitive materials (for example pharmaceuticals not allowing the addition of any kind of agglomerating fluid or reacting strongly in the contact of the two phases), a process of compaction between rolls with different profiled surface was successfully applied. The developed high technologies and the resulting products thus represent a major contribution to environmental protection in the context of not only the work but also the communal environment.

Design of Particulate Material Compactor Rolls Diameter

“…However, in Figure 13, it is observable that the function has an exponential course, with the rolls diameter of the proposed production compactor not reaching 0.185 m, so that the proposed diameter is also able to compensate for the local maximum pressure extremes p m between the rolls of the compactor. This method of designing the compactor roll could be used in the design of processing technology not only for fertilizers but also for other applications of the compacting of a particulate material (for example, dust from production of brake linings [12,20] following the elimination of the problems in this area [21,22] …”

Modification of Powder Material by Compaction Processing

“…The principle for measuring the strength against breaking and disintegration is shown in Figures 7 and 8. The complete process, the composition, and the parameters examined in the creating of the samples, as well as the testing of the strength against breaking and disintegrating, are shown in [17]. The strength required for the breaking of the samples depends mainly on the rotational frequency of the compactor's rolls and the strength of the forced feeding of the material between the rolls.…”

Investigation of Frictional Stick-Slick Effect in Disk Brake NVH

“…Nowadays, producers of braking components especially braking pads are strongly bounded by legislation to follow trends of sustainable reduction of environmental burdening and recyclability of materials [10,11] which makes the process of developing the silent brake system even more of a challenge.…”