Abstract
The authors studied on the flotation concentration of the low grade iron ore (30-38% Fe) from near Anshan, Manchoukuo by using the M.S. 500g testing machine, and gave experimentally a clear solution for this problem.
In this research the following results were obtained.
1. The fatty acids composed mainly of linolenic acid, which had been obtained from drying or semidrying vegetable oils such as poppy sead oil, soya bean oil, showed so strong collecting power for the iron ore that these may be used as good flotation reagents. By using the unsaturated fatty acids, which had been separated from the above-mentioned vegetable oils, or the mixture of the fatty acids and high temperature tar, the authors su ceeded in flotation experiment even for the low pulp temperature between 2 and 10°C.
2. The most preferable conditions for flotation were as follows: soda ash 800-1000g/t, fatty acid 200g/t, pulp density··roughing 30-35%, cleaning 20-25%, peripheral speed of impellor 150-300m/sec, grinding 150mesh, flotation time··rou hing 10min, cleaning 4min.
3. By roughing 10min and successively cleaning 4min under above-mentioned conditions, the authors obtained the following results for the 36% Fe ore: concentrates with 60% Fe, tailings with 10% Fe, iron recovery 85%.
