Abstract
SYB2# (a category of hydroxamic acid) was employed as the collector of ilmenite flotation. Sodium carboxymethyl cellulose was employed as the depressor of gangue, and sulphuric acid as the pH adjustor of flotation. The effect of pH values on the recovery of ilmenite and gangue was investigated on the condition with (or without) depression respectively. The results demonstrate that pH value does not have any obvious effect on the recovery of ilmenite or gangue when no depressor is added. On the contrary, the pH value plays an important role in ilmenite flotation when depressor is added. To be specific, the recovery of ilmenite increases obviously with pH value decreasing. Having a comparison among the recoveries of ilmenite with different pH values adjusted by sulphuric acid, hydrochloric acid and nitrating acid, it is concluded that sulphuric acid produces anti-depression effect on ilmenite depressed by sodium carboxymethyl cellulose.
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