Studies on the composition of aluminum hydroxy silicate polymer were undertaken using gel filtration chromatography. Preliminary analysis indicates that 14 to 17 silicon atoms to 1 aluminum atom are contained in the polymer. Optimal ph for formation is between 5.5 and 6.5. Electrokinetic and microflotation studies on pure minerals were undertaken to establish mechanisms of aluminum hydroxy silicate adsorption and to determine the effect that this dispersant exhibits on flotation response. The polymer chemisorbs on chrysocolla, chalcopyrite, and chalcocite but does not interfere with flotation even with relatively large additions. Dispersion of finely divided particles with aluminum hydroxy silicate sol results in improved recovery in copper flotation systems. Copper recovery is increased by 4.9 pct from an oxide ore and 2.1 pct from a sulfide ore in the presence of low additions of aluminum hydroxy silicate sol.
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