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A variety of iron precipitates formed in the electrolytic zinc industry were studied to estimate the possibility of magnetic filtration to augment conventional thickening/filtering systems. The precipitates included K,NH(,4),Na jarosites, (alpha) and (beta) goethite, (alpha) hematite and an industrially produced NH(,4) jarosite. The wet Frantz Isodynamic Separator was used to generate magnetic susceptibility data. Susceptibilities ranged from (kappa) = 6.9 x 10('-5) (--->) 15.5 x 10('-5) emu/cm('3)0e. Particle size of the precipitates ranged from 25 (mu)m to < 1 (mu)m. Magnetic filtration breakthrough curves were produced using a high gradient magnetic filtration technique. The role of fluid viscosity and velocity as well as magnetic field was studied. / All the precipitates proved filterable. A comparison was made of a physical and an empirical model of the breakthrough curves in the sizing of the magnetic filters required to treat thickener overflow at the CEZ Valleyfield plant. / For a volumetric flow of 100m('3)/hr electrolyte, containing 15g/L NH(,4) jarosite, 2 magnets of 2.6m diameter and 0.35m bed depth are required to lower solids contents to the present operating level of 3g/L.

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