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Table 13 These results are shown for Test n2 52 in the table below. Having in mind these considerations, tests were conducted in the absence of Sodium Carbonate or a much reduced addition. Broadly speaking, Froth stability increased significantly, but recovery decreases dramatically without a significant increase in Concentrate Grade, even in the Cleaning stages with Phosphate addition. Carbonate or a much reduced addition. Broadly speaking, Froth stability increased