Novel Fatty Acid-based Collector in Low-temperature Desilication of Iron Ore by Flotation in Anshan City
A low-temperature reverse flotation experimental study was carried out on the mixed magnetic concentrate from a processing factory in Anshan using a new fatty acid-based low-temperature resistant collector KDB-3.The results showed that the reverse flotation process of"one stage rougher flotation,one stage cleaning and three stage scavenging"was adopted for the mixed magnetic concentrate with 50.10%iron grade.When the roughing slurry temperature was 10～15℃,the dosage of inhibitor caustic starch was 650 g/t,the dosage of activator calcium oxide was 900 g/t,the dosage of collector was 1 150 g/t,and the dosage of adjusting agent sodium hydroxide was 900 g/t,and the dosage of sodium hydroxide was 900 g/t(pH=11.5),an iron ore concentrate with iron grade of 67.80%and recovery of 87.46%was obtained using KDB-3,while only an iron ore concentrate with iron grade of 66.57%and recovery of 67.16%was obtained using sodium oleate as collector under the same experimental conditions,showing the remarkable effect of the novel collector.When the novel collector KDB-3 was used,an iron ore concentrates with an iron grade of 67.90%was obtained at room temperature(25℃),with a recovery of 89.18%,which was similar to the indexes under low-temperature conditions,indicating the applicability of the novel fatty acid type collector KDB-3 under both low-temperature and room-temperature conditions.Effective low-temperature flotation of iron ore from a processing plant in Anshan city was achieved.
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