Reagents in iron ores flotation

The role of reagents utilised in iron ores flotation is reviewed. Desliming and flotation stages should be performed at pH levels as low as possible to reduce the expenses with caustic soda. Ether amines are by far the mostly utilised class of collector. The degree of neutralisation of the ether amine is an important process parameter. The partial substitution of amine by non-polar oils seems to be an attractive route. Part of the amine may be also replaced by polyglycols in its frother role. Starches still represent the most important class of iron oxides depressant. Very pure corn starch may be successfully replaced by products from the food industry containing proteins. Oil grades in the starch higher than 1.8% may act as froth inhibitors. Cassava starch may be an economically attractive option since the production capacity meets the required demand level. (C) 2004 Elsevier Ltd. All rights reserved.