Magnetization fraction

In order to retain the magnetic fraction of the material in the collection volume of the separator it is necessary that... 

In all induced-pole devices, the more magnetic particles are retained on the matrix while the less magnetic fraction is carried away in the slurry. 

The flowsheet used for apatite flotation is shown in Figure 25.10. The ore was ground to a Algo of 80 pm, followed by magnetic separation. The non-magnetic fraction was subjected to apatite flotation and upgrading. 

Soil samples were wet sieved into (a) 2-4 mm, (b) 1-2 mm, (c) 0.5-1 mm, (d) 250-500 i m, (e) 125-250 am, (f) 63-125 j,m and (g) <63 j.m fractions. A ferruginous/magnetic fraction (m) was also prepared from the 2-4 mm fraction. Soil fractions were crushed, digested with HNO3/HCI/HF/HCIO4 and then analysed by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) for Al, Ca, Cu, Fe, K, Mn, Na, P, S and Zn. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to determine Ag, As, Cd, Pb and Sb because of the lower detection limits by this method. The mineralogy of selected samples was determined by qualitative X-ray diffractometry. 

Figure 6. Gamma-ray spectrum of neutron-activated fly ash-magnetic fraction...

It is worthy of note that EW products have very strong ferromagnetic properties in a number of cases. Dependence of magnetization versus temperature corresponding to the separated magnetic fraction of EW products is represented in Fig. 4. The magnetization curve is typical to those of ferromagnetics. 

Shang, C., and H. Tiessen. 1997. Organic matter lability In a tropical Oxisol evidence from shifting cultivation, chemical oxidation, particle size, density, and magnetic fractionations. Soil Science. 162 795-807. 

Coercivity and saturation magnetisation parameters are influenced by domain state (and hence by grain size of the magnetic fraction). Domain state in materials where the remanence is dominated by magnetite can be determined by position on a Day plot (Day et al., 1977) on such a plot, stability of remanence increases towards the upper left comer. Samples BC4, RC2, RC3, and RC5, all of which show evidence in their demagnetisation behaviour for the presence of a reversed-polarity component, plot closest to the stable part of the Day plot (Fig. 10). Samples BCl, BC3, BC5, and RCl 1, which do not show a clearly isolated reversed component, plot in less stable positions. Samples RC4 and RCl2, which have complex demagnetisation, plot as outliers, well to the less stable side of the plot. 

The uptake of Cs by uncontaminated Dounreay offshore sand was investigated to confirm which mineral were involved in caesium sorption (DST-R 250pm fraction was tested). The results showed that the more-magnetic mineral fraction had a higher sorption capacity than the non-magnetic fractions. It is notable that the interaction time of 24hr may have been too short to establish maximum uptake potential. 

Figure 8. Effect of further magnetic separation on the most-magnetic fraction of the Foreshore sample DFS 4 (>500pm fraction) (susceptibility increases left to right). The trio of bars shown are for sample mass (g), Cs concentration (Bq/g) and inventory (Bq)...

In the second method, the magnetic fraction is attracted to the drum surface or elevated (Figure 16(b), (c)), depending on whether the direction of the feed is con- or counter-current to the direction of the drum rotation. The second method provides a cleaner product, especially the counter-current rotation case. 

Cramer, S. D. Carter, J. P. Covino, B. S., Jr. "Atmospheric Corrosion Resistance of Steels Prepared from the Magnetic Fraction of Urban Refuse" U.S. Bureau of Mines, RI 8477,... 

The remaining batteries are fed into a charging hopper which feeds a pocketed belt conveyor. This in turn deposits the batteries onto a cascade of sieves which have been carefully selected to remove dust and button cells. The remaining batteries are then fed onto a wide band conveyor which passes beneath a magnetic over-band conveyor which separates the magnetic fraction from the paper jacketed zinc carbon cells and batteries. 

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