Flammable and explosives powders

Processing with flammable or explosive materials

In particular types of processing, the production requirements arising from the type of processing or from the type of machined material require the company a dry processing, or without luber-refrigeration.

This type of dust residue is mainly found in the mechanical and metal industry in the aerospace and automotive sectors, where processing such as turning, milling, grinding, grinding, grinding, wire drawing, drilling, boring, shearing, threading, cold deformation of metal materials are the primary source, especially the brushing or finishing phases of the newly cast parts or worked.

Dry powders of flammable explosive materials such as magnesium or aluminium, if they reach a minimum size, become volatile and during machine/cleaning, remain suspended in the air, becoming suspended potentially explosive.

These flammable and explosive powders, if not sucked at the source and knocked down, can be a source of primary and secondary explosions.

An explosion is defined as an energy release, in a very short time and in a relatively narrow space, capable of generating a pressure wave and a flame front that propagate very fast in the surrounding space.

Liberation of energy for dust explosion occurs by effects of the following combustion reaction:

FUEL DUST + COMBUSTIBLE OXYGEN = OXIDES + ENERGY

In order for a process to exist a hazard of dust explosion (e.g. magnesium powders) the following conditions (all necessary) must occur: the dust must be combustible and present in aero-dispersed form with a particle size and a concentration such as to allow the flame to propagate.

Obviously there must be an ignition source: friction, impact, static electricity, compression phenomena, flames, glowing materials, electric sparks, hot surfaces.

Finally, there must be a sufficient amount of oxygen comburant to allow the combustion that can be transformed into an explosion.

Moreover, the phenomenon of explosion of dust is much more complex than that of flammable vapors since the parameters that characterize the danger of a dust-air mixture are very variable in relation to the physical characteristics of the mixture and in the various equipment. While the mixture of flammable gases and vapours usually has definite and constant vestments (concentration, flammability temperature) a dust/air mixture may undergo in the process of variations that they alter their characteristics and therefore also their dangerousness.

Based on these factors, the HYDROFILTER series takes advantage of the simple principle that increasing humidity strongly reduces the possibility of triggering a fire. The humidity in fact causes an agglomeration of the particles between them, increasing their diameter and thus drastically reducing the risk of explosion.

Fine/volatile powders potentially dangerous, are knocked down and rendered harmless and conveyed in the form of mud into the liquid purifier underneath.