Iron swarf

Ferrocyanide -(prussiate) was produced from sulpluicyanide by treating with finely divided iron ( swarf ) —... 

Iron phosphate CBPCs may provide inexpensive means to recycle these waste streams. Iron mine tailings and red mud may be recycled in building components by fabricating ceramics from them at ambient temperature. Iron-rich swarfs may be recycled if a way is found to solidify these fines into pellets and feed them back into a blast furnace. Thus, iron phosphate CBPCs facilitate solidification of iron-rich waste streams and recycling. 

In spite of this limitation, the method is very useful, because it provides a means of forming a ceramic of one of the most common and inexpensive oxides. As discussed before, iron oxide is a component of lateritic soils and red mud, high-volume iron mine tailings, and machining swarfs. Thus, useful products of several mineral waste streams can be formed by the process described in this chapter. Development of ceramics using red mud and swarfs is discussed in Chapter 14. 

CBPC matrix composites can incorporate a high volume of industrial waste streams such as fly ash, mineral waste such as iron taUings and Bayer process residue from the aluminum industry (red mud), machining swarfs from the automobile industry, and forest product waste such as saw dust and wood chips. Table 14.1 lists some of these waste streams and potential products or applications. 

As listed in Table 14.1, various other waste streams can be incorporated in Ceramicrete to produce useful ceramic matrix composites. In addition to those listed in the table, Wagh and his group have explored incorporating drill cuttings from oil fields, slags from iron industry, wood chips, saw dust, and many other waste streams [8]. Most of these studies were limited to proof of concept, and more work is needed to demonstrate concept usefulness. Here, we discuss case studies on swarfs and red mud in which detailed work has been done. 

The most common metal swarfs are iron-based [9,10] and produced by the machine tool and automobile industries. The resulting fine Fe particles oxidize in storage and form magnetite and hematite. Because they also contain flammable machine oils, this oxidation makes them pyrophoric and hence a liability. Because the particle surfaces are coated with oil, they cannot be incorporated in conventional cement. As demonstrated by Wagh and Jeong [3], the acid phosphate in the CBPC process acts like a detergent and exposes the surface of these particles to the acid-base reaction and binds them. 

Swarfs EL, Cook IM. Photosensitivity of reduced silicate glasses containing iron. 7th International Conference on Glass, Jime 26-July 3. 1965. 

Other high-quality metal refuse that is suitable for remelting is not produced or collected in such large amounts as cast-iron borings or aluminum swarf, discussed above. Such materials are densified and shaped in newly designed small hydraulic punch-and-die presses. Fig. 6.9-25 shows a collection of briquettes from different... 

Sections of ceramic samples are often subjected to microprobe analyses or SEM examinations with an accessory device for energy-dispersive X-ray analysis. It is essential to avoid the introduction of any elements which are intended to be measured in these examinations or which may have a disruptive influence on them. It is therefore essential to pay special attention to swarf from metal-bonded diamond wheels, composite disks, or disks made of cast iron, lead, copper, or tin, as this swarf may accumulate in pores or in the form of thin surface films. This also applies to swarf from the sample and polish residue, which may remain on the sample after final polishing with alumina, for example. 

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