鉄鉱石の浮游選鉱に関する研究

Abstract

The authors reported previously that the fatty acids composed mainly of linolenic acid could he used as good flotation reagents for iron are especially for the low-temperature pulp between 2 and 10°C. In this research, further studies have been made on the flotation reagents for the iron ore, the following results being obtained: 1. For the low-temperature pulp the soya-bean fatty acid develops good floating power, (a) when saturated, fatty acids therein have been removed by the press after cooling at-3°C just as in the action process, (b) or when over 30% of coke-oven tar has been mixed in the soya-bean oil. 2. For the conditioning reagents, K2CO3, NA2S, NH4OH give good results as soda ash, but other salts and alkalis do not. 3. For several hematite ores from the Anzan region, soda ash 800-1000g/t and fatty acid 180 g/t are used favourably. The magnetite ores from the same region are less liable to float than hematite in the same condition. 4. Hardness of water used may be so- high as 6°, that the river water of Anzan may be utilized. 5. Water may be eirculated by thickening after adding 0.1g/l aluminium sulphate. 6. Due to the dispersive action of the soda ash, the settling velocity is quite slow. This may be removed by adding 0.1 g/l aluminium sulphate or 1.2 g/l lime. The aluminium, sulphate is more favourable than the lime since the latter increases the hardness of water.