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Extra info for Beneficiation of phosphate ore
As air bubbles rise through the collection zone, they become loaded with hydrophobic particles and enter the “cleaning” zone. The cleaning zone, also called the froth zone, is where the loaded bubbles accumulate and flow over into the froth concentrate launder. 3). Washed particles are sent back down into the collection zone; this is often referred to as “froth dropback” (Finch and Dobby 1990). Utilization of wash water is a key component in column flotation producing high-grade froth concentrates.
However, some amounts of physisorption have been proposed because of the presence of dissolved calcium ions in plant water. 22) (Gruber et al. 1995). This results in conditions that are favorable for physical adsorption of negatively charged carboxylate ions (Maltesh et al. 1996). 5 Conditioning at high percent solids improves reagent dispersion, which results in more mechanical spreading of FA/FO droplets onto the surface of the phosphate particles (Oswald 1993; Lu et al. 1997). However, it is important that the conditioner does not generate excessive amounts of slimes as they will significantly lower selectivity and recovery during phosphate flotation.
However, when plant water was used, the zeta potential of francolite becomes positive over the entire pH range because of the adsorption of Ca+2 ions (Guan 2009a). 5–6. At pH 6, the zeta potential reverses back to a negative charge and follows the same trend as quartz in water from pH 5−2. I. I. Water 30 Zeta Potential (mV) 20 10 0 pH 1 2 3 4 5 6 7 8 9 10 11 12 –10 –20 –30 –40 Source: Adapted from Gruber et al. 1995 and Guan 2009a. ) water and plant water et al. 1995). The adsorption of Ca+2 ions on quartz at a basic pH can be detrimental to the Crago double float process because of the hetero-coagulation of calcium carboxylate precipitates on the quartz surface.